AEC V8

gingerfold:

cav551:
Great minds think alike cav551, yesterday I actually emailed the BCVM archives to make an appointment to go through all the Scammell Crusader build sheets and find out because the same question had crossed my mind. Unfortunately the museum is closed until later this year as it is undergoing a complete refurbishment. But I will definitely be going. I would wager that sales of Detroit Diesel V8 powered Crusaders into the civilian market didn’t reach three figures because I can never recall seeing one or hearing one. I do know what that engine sound like (noisy and harsh) from my frequent trips to Dublin in the 1980s where most of the buses had that screaming banshee of an engine in them.

Oh, and Carryfast, when the BCVM re-opens you are welcome to join me and I’ll pay for all your travelling expenses, overnight hotel accommodation and any other incidental expenses you accrue. It will be an education for you seeing what documents exist and what they can actually tell you, instead of googling the internet and believing a lot of the mis-information and rubbish that is on the internet.

Blimey leave it out.The internet didn’t exist when it was made clear to me,by the very real choices made by obviously cleverer designers than AEC’s,in fitting engines into trucks that lives depended on,that the Detroit was leagues ahead of the AEC V8.Which probably explains how ultimately the still smaller capacity,than the AEC V8, 8 v 92 could handle the job in the HET previously done by the 26 litre Rolls CV12.Make no mistake the only reason that there was never a 4 x 2 8 v 71 powered Scammell Crusader was the obvious issue that it would have over night destroyed the business case for AEC’s silly Mandator.Ironically also actually meeting the AEC’s design aim for a 300 hp V8 in the process not to mention being able to do it reliably.

As for the museum trip.No let’s just pitch the surviving 8v71 powered Crusaders against their remaining AEC counterparts and see which ones come out on top.It’s my bet that there are more of those survivors in the case of the Crusader than the AEC.On that note can you actually post any AEC V8 examples that can actually haul a proper load up a decent hill without falling apart as opposed to an empty trailer on a flat piece of dual carriageway.This sounds closer to what a Scania V8 would sound like when it’s pulling under load.Than the previous AEC vid which as expected sounded more like the bag of nails Perkins etc that I’d heard in numerous lesser fire trucks than ours over the years.

youtube.com/watch?v=GX_R8eogw1Q

As for the Irish buses did you actually check they were 8v71 powered and not 6 or 8v53 ?.

ERF:

[zb]
anorak:
…the new, high torque/low speed V8 had completely different geometry to the old one- it was oversquare! That’s right- to generate more torque, they increased the bore and reduced the stroke! Obviously, the higher torque came from Mack’s clever use of the turbocharger, but it leaves the notion that, had AEC persisted with their turbocharged V8, they would not have been hampered by their base engine geometry, in the pursuit of a torque curve to match their competitors.

This is very significant in this story. It is precisely the opinion expressed to me by engine designers who retrospectively examined the AEC V8 design.

And totally contradicts Scania V8 development to date.Remind us which 2,500 lb/ft 730 hp V8 Mack engine is still available.

ramone:
Im out of work and thinking of becoming a fire engine tester anyone got any advice , I know nothing about anything but Im wiling to not listen to reason or facts from anyone who knows what they are talking about :wink: :laughing:

You could probably start by making a count of every 71 and 92 series Detroit powered fire engine around the world v AEC V8 powered ones. :smiling_imp: :laughing: Then when you’ve finished that you can start on proper civilian haulage applications.Yes we know the Brits can be let’s say a bit ‘special’ with some strange ideas in that regard.Which is how they came to build the AEC V8 instead of just meeting the spec more effectively and reliably with a 4 x 2 8v71 powered Crusader. :unamused: :laughing:

cav551:

Carryfast:
Yep.■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ all gutless unreliable junk.Much better to go for a good old fashioned Brit designed V8 with a 114 mm stroke purposely designed with less than 600 lb/ft of torque so as not to over load its transmission with the bonus that it fitted under the state of the art dustcart cab. :smiling_imp: :open_mouth: :laughing:

So apart from the ■■■■■■■ 642 which appeared in some Guy, Seddon and ERF vehicles, how about you reminding us of the market penetration of other US components in UK lorry sales at the time … early 1960s?

You can have the most technically advanced product ever known to man, but if the customers don’t want it there will not be any sales. Now I’ll take an uninformed punt the following:

Does the UK market see a similar uptake in percentage of householders following the US trend for ‘garbage disposal’ units attached to the kitchen sink waste pipe? I’ll guess not.

Quote Carryfast: "Bearing in mind that the competition like Scania obviously didn’t need to ask for Fuller’s help here unlike AEC. :unamused:"

Do please remind us about the Scania 10 speed splitter gearbox of the period and its reputation for reliability…

How were Fuller going to get the penetration if the Brits preferred the idea of meeting the competition like the 140 ( or the Detroit 71 series ) with around 580 lb/ft and their ( our :frowning: ) own weak transmissions to match,instead.

As for the Scania box.Strange how I got flamed for saying that the only thing which could have improved it was a Fuller box thereby contradicting the bs that all in house is always best.

The AEC V8 was actually ‘introduced’ in the market in 1968 a matter of months before the 140.

All of which makes the case against a 130x142 V8 powered 3 VTG with a 13 speed Fuller in it in 1969 instead of the Ergo dustcart how ?.

ramone:
Im out of work and thinking of becoming a fire engine tester anyone got any advice , I know nothing about anything but Im wiling to not listen to reason or facts from anyone who knows what they are talking about :wink: :laughing:

My Mate Sam previously from Pontypandy now living in Leatherhead can offer advice on testing fire engines, he was also an engine designer guru in his previous job…

Carryfast:
…the Brits can be let’s say a bit ‘special’ with some strange ideas…

The most accurate words you have EVER contributed to TN!!.
Certainly very true in your case!. :laughing:

ERF:
Just for interest (…hopefully!) here is a very late (September 1969) comparison sheet for the two engines offered in the 2VTG4R Mandator V8 and 2VTG6R Mammoth Major V8.

These ‘high datum’ models were predominantly aimed at export markets, but a very small quantity of both did find their way onto UK roads, as ‘gingerfold’ has confirmed.

The AV800 engine was down-rated from the AV801 specification purely by it’s fuel injection pump. The AV800 used the same injection pump as the later AV740’s, with smaller delivery elements than the pump fitted to the AV801.
Both AV800 and AV801 engines were the same 13.1 litre (800 Cu/in) capacity with 135mm bore.

I should perhaps add that the records confirm that AV801 powered Mandator V8’s were also available to order, and did go out to New Zealand in particular.

0

Let’s get this right.AEC’s idea of economical high speed operation was 200 hp at 1,850 rpm and SFC of well over .35 lb/hp/hr heading for a max output of less than 250 hp at .40 lb/hp/hr at a screaming 2,600 rpm.That’ll work.

While it’s clear that the meagre 580 lb/ft torque output being referred to was in respect of the 800 not the 740.In which case what was the max torque output of the 740 ?.

As for NZ I’ve posted an example of an 8v71 powered Crusader that’s still up to hauling a decent load can you show any working examples of same regarding any surviving V8 Mandators there ?.

dave docwra:

ramone:
Im out of work and thinking of becoming a fire engine tester anyone got any advice , I know nothing about anything but Im wiling to not listen to reason or facts from anyone who knows what they are talking about :wink: :laughing:

My Mate Sam previously from Pontypandy now living in Leatherhead can offer advice on testing fire engines, he was also an engine designer guru in his previous job…

Is he in an institution or would he be approachable :wink:

newmercman:
Robert, never let facts stand in the way of a good argument.

or a conspiracy theory

Carryfast:

cav551:

Carryfast:
Yep.■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ all gutless unreliable junk.Much better to go for a good old fashioned Brit designed V8 with a 114 mm stroke purposely designed with less than 600 lb/ft of torque so as not to over load its transmission with the bonus that it fitted under the state of the art dustcart cab. :smiling_imp: :open_mouth: :laughing:

So apart from the ■■■■■■■ 642 which appeared in some Guy, Seddon and ERF vehicles, how about you reminding us of the market penetration of other US components in UK lorry sales at the time … early 1960s?

You can have the most technically advanced product ever known to man, but if the customers don’t want it there will not be any sales. Now I’ll take an uninformed punt the following:

Does the UK market see a similar uptake in percentage of householders following the US trend for ‘garbage disposal’ units attached to the kitchen sink waste pipe? I’ll guess not.

Quote Carryfast: "Bearing in mind that the competition like Scania obviously didn’t need to ask for Fuller’s help here unlike AEC. :unamused:"

Do please remind us about the Scania 10 speed splitter gearbox of the period and its reputation for reliability…

How were Fuller going to get the penetration if the Brits preferred the idea of meeting the competition like the 140 ( or the Detroit 71 series ) with around 580 lb/ft and their ( our :frowning: ) own weak transmissions to match,instead.

Well I would have thought the answer to that was obvious.

As said, like in many walks of life, a sensible business doesn’t jump in feet first at the merest rumour about a new to the market product’s reputation. That being particularly true if the reputation is based upon different operating conditions (USvUK). That business has a look around and lets someone else try it first. Once favourable and verifiable reports from trusted sources became available interest is aroused. Which is exactly what happens and happened.

So in this instance ERF are reported as being the first, in 1964, to offer as a UK production option the LV tractor unit equipped with the Fuller Roadranger gearbox . One source mentions that Atkinson fitted a few ‘Fuller’ gearboxes in 1958 without specifying whether these were for the domestic market. Presumably done either to test the market or limited to export models.

Carryfast:

[zb]
anorak:
Now have a closer look at the specification of that engine, the ENDT865- the new, high torque/low speed V8 had completely different geometry to the old one- it was oversquare! That’s right- to generate more torque, they increased the bore and reduced the stroke! Obviously, the higher torque came from Mack’s clever use of the turbocharger, but it leaves the notion that, had AEC persisted with their turbocharged V8, they would not have been hampered by their base engine geometry, in the pursuit of a torque curve to match their competitors.

Seems a bit selective in ignoring the 998 versions.While,unlike Mack,Scania’s development of its V8 has always been a case of concentrating on progressively making very considerable increases in its stroke from the original with just a 3mm increase in bore size to date

Which leaves the question what made Mack drop its interest in the V8 configuration while Scania still sees plenty of life in it ?. :bulb: :wink:

dieselnews.com.au/road-test- … 10-engine/

Mack didn’t drop interest in the E9 at all.When Volvo took hold of Mack after the take over of Renault,they shelved Mack power train group and tucked them up with the MP10(D16D Volvo).Seemingly though Ozz hauliers prefer the E9.

Carryfast:
As for the museum trip.No let’s just pitch the surviving 8v71 powered Crusaders against their remaining AEC counterparts and see which ones come out on top.It’s my bet that there are more of those survivors in the case of the Crusader than the AEC.On that note can you actually post any AEC V8 examples that can actually haul a proper load up a decent hill without falling apart as opposed to an empty trailer on a flat piece of dual carriageway.This sounds closer to what a Scania V8 would sound like when it’s pulling under load.Than the previous AEC vid which as expected sounded more like the bag of nails Perkins etc that I’d heard in numerous lesser fire trucks than ours over the years.

youtube.com/watch?v=GX_R8eogw1Q

As for the Irish buses did you actually check they were 8v71 powered and not 6 or 8v53 ?.

Yes I’ii let you have that one CF, the Dublin buses were 6V-71 powered with Allison V730 auto gearboxes. I understand that they were a Bombardier design and some 366 double deckers were built, the first ones entering service in 1981 and the last were withdrawn in 2001.

The list of Crusaders known to exist is, I’m afraid, only nine vehicles, so fewer than surviving Mandator V8s, so you’ll lose you wager. And not all of them will have the Detroit Diesel V8. Considering that the Crusader had a 20 year production life (last military spec. vehicles) compared with less than 2 years for the Mandator V8…

The list of Crusaders is:

1973 OEU 436M
1977 OBU 152P (6x4)
1978 Q270 SBD
1978 JRU 865V
1979 FLW 608J
1978 HVW 121T
1979 ELW 608J
1979 ULA ■■?
1979 JVM 906V

I don’t think “Stacked it” is going to be very happy.

viewtopic.php?f=35&t=152671#p2430841

[zb]
anorak:

railstaff:

[zb]
anorak:
Yes, that’s as I understand it. The site I linked seems to think that the 16 litre Mack and Scania engines are based on the same block, based on their similar capacity (16.4 litres).

If I remember correctly at the time Scania were using it at 14.2 litre,Mack were using it at 16 litre.

This site gives a perfect potted history of the Mack V8s:
forums.aths.org/176810/Antique-Engine-specs
I have copied the history until the first 16 litre engines onto this picture:
0

It makes fascinating reading, especially in the context of this:
scania.com/group/en/wp-cont … -50164.pdf

The Scania document says, “The new Scania 14.2-litre V8 engine had no genuine forerunner in the diesel engine world.” Hahaha!!! The first Mack V8 of those dimensions was launched in 1960! Mack were launching a Maxidyne version in 1969- in other words, as Scania introduced their 140, Mack was building the engine that went into the 141! Whatever the truth of the story, the Swedes were the winners in sales: Their version had sales of 170,000, against about 32,000 for Mack’s, according to each document.

What has this got to do with the AEC V8? Mack fans (I am one :smiley: ) will proudly state that the first “high torque rise” engine was the Maxidyne. When it was launched in 1966, its high torque peak and low maximum power speed were unprecedented, and those features became the template for all automotive diesel developments thereafter. The pre-Maxidyne V8s were all 5x5.5" (127x140) engines, similar to the DS14. The Maxidyne V8s were launched in 1969 , effectively superceding the earlier engine (which soldiered on until 1972). Now have a closer look at the specification of that engine, the ENDT865- the new, high torque/low speed V8 had completely different geometry to the old one- it was oversquare! That’s right- to generate more torque, they increased the bore and reduced the stroke! Obviously, the higher torque came from Mack’s clever use of the turbocharger, but it leaves the notion that, had AEC persisted with their turbocharged V8, they would not have been hampered by their base engine geometry, in the pursuit of a torque curve to match their competitors.

Makes interesting reading,ive seen the Mack spec sheet on an American forum before,they didn’t believe the Swedish BS either.Quite interesting to see the DS14 and END865 next to each other.The three main differences are,

DS14 has lateral bolts into the main housings,the 865 has none.

DS14 has single heads,the 865 has four heads,two either side.

Later 865 had four valve per cylinder,maybe explain the bore increase.

Carryfast:

[zb]
anorak:
Now have a closer look at the specification of that engine, the ENDT865- the new, high torque/low speed V8 had completely different geometry to the old one- it was oversquare! That’s right- to generate more torque, they increased the bore and reduced the stroke! Obviously, the higher torque came from Mack’s clever use of the turbocharger, but it leaves the notion that, had AEC persisted with their turbocharged V8, they would not have been hampered by their base engine geometry, in the pursuit of a torque curve to match their competitors.

Seems a bit selective in ignoring the 998 versions.While,unlike Mack,Scania’s development of its V8 has always been a case of concentrating on progressively making very considerable increases in its stroke from the original with just a 3mm increase in bore size to date

Which leaves the question what made Mack drop its interest in the V8 configuration while Scania still sees plenty of life in it ?. :bulb: :wink:

“What made Mack drop their highly regarded V8?” was the very question I asked a retired diesel design engineer at the old Mack Research and Design complex at Allentown in Pennsylvania. The place is now a museum and heritage centre; Tom, the engineer was my guide for the museum tour and knew his stuff.
“We didn’t need it anymore. We were getting over 400 horse power from a straight-six.” Was his simple answer.

Has any engine design ever got it right straight out of the design studio? I mean a completely new design, not an evolution of a previous design.

As usual the comparisons being made are apples to bananas, established designs, or production examples released after months/years of testing against the prototype AEC engine.

And I must point out that the video of the Crusader pulling up a hill sounds absolutely nothing like a V8 Scania, nothing at all.

Sent from my SM-G950W using Tapatalk

If AEC had built the TL12 in 68 this thread wouldnt have existed or am I opening another can of worms :wink: :smiley: :laughing:

ChrisArbon:

Carryfast:

[zb]
anorak:
Now have a closer look at the specification of that engine, the ENDT865- the new, high torque/low speed V8 had completely different geometry to the old one- it was oversquare! That’s right- to generate more torque, they increased the bore and reduced the stroke! Obviously, the higher torque came from Mack’s clever use of the turbocharger, but it leaves the notion that, had AEC persisted with their turbocharged V8, they would not have been hampered by their base engine geometry, in the pursuit of a torque curve to match their competitors.

Seems a bit selective in ignoring the 998 versions.While,unlike Mack,Scania’s development of its V8 has always been a case of concentrating on progressively making very considerable increases in its stroke from the original with just a 3mm increase in bore size to date

Which leaves the question what made Mack drop its interest in the V8 configuration while Scania still sees plenty of life in it ?. :bulb: :wink:

“What made Mack drop their highly regarded V8?” was the very question I asked a retired diesel design engineer at the old Mack Research and Design complex at Allentown in Pennsylvania. The place is now a museum and heritage centre; Tom, the engineer was my guide for the museum tour and knew his stuff.
“We didn’t need it anymore. We were getting over 400 horse power from a straight-six.” Was his simple answer.

Bet that was an enjoyable visit,i suppose he was right because they then turned to ■■■■■■■■ ETC,for higher horsepower.Some people at Mack were not happy about not having their own in house propriarity high horsepower engine.

railstaff:

ChrisArbon:

Carryfast:

[zb]
anorak:
Now have a closer look at the specification of that engine, the ENDT865- the new, high torque/low speed V8 had completely different geometry to the old one- it was oversquare! That’s right- to generate more torque, they increased the bore and reduced the stroke! Obviously, the higher torque came from Mack’s clever use of the turbocharger, but it leaves the notion that, had AEC persisted with their turbocharged V8, they would not have been hampered by their base engine geometry, in the pursuit of a torque curve to match their competitors.

Seems a bit selective in ignoring the 998 versions.While,unlike Mack,Scania’s development of its V8 has always been a case of concentrating on progressively making very considerable increases in its stroke from the original with just a 3mm increase in bore size to date

Which leaves the question what made Mack drop its interest in the V8 configuration while Scania still sees plenty of life in it ?. :bulb: :wink:

“What made Mack drop their highly regarded V8?” was the very question I asked a retired diesel design engineer at the old Mack Research and Design complex at Allentown in Pennsylvania. The place is now a museum and heritage centre; Tom, the engineer was my guide for the museum tour and knew his stuff.
“We didn’t need it anymore. We were getting over 400 horse power from a straight-six.” Was his simple answer.

Bet that was an enjoyable visit,i suppose he was right because they then turned to ■■■■■■■■ ETC,for higher horsepower.Some people at Mack were not happy about not having their own in house propriarity high horsepower engine.

I think it has more to do with the typical US way of doing things. Practically all long-haul truck engines for the last 20 years in North America have been in 400 to 500 horse power range. There doesn’t seem to be the high-power output race that there is in Europe. Volvo have stopped offering their 16 litre, ■■■■■■■ ISX is typically 435 to 485 bhp and 565 on special order. Detroit Diesel DD15 is about 500 bhp. Most truck buyers seem content with an average output of 450 bhp to pull 20 tons of freight down the road at 65 mph.

■■■■■■■ most certainly don’t want to get in to a power race,saying that they don’t want to do anything anymore so it seems.What do Volvo offer now then in the states with White?