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This is written by Christian Olsson as have written ”Trucks of yesterday and today” and “Volvo’s jubilee book when the firm celebrated its 70th anniversary.”
Autumn of 1970 presented the first concrete result in the form of a new product from a year earlier formed the truck sector. It was about what was presented under the title “Power Package” model F89 (and simultaneously introduced the “G89” with set forward front axle)
Before F89 had detailed studies been done to determine if it would bring out a brand new straight six-cylinder diesel engine, or if you would limit the scope of the design by making a V engine with the same cylinder dimensions as any previous Volvo diesel in the product range. The background to the new model and why you decided to stay with the principle of the “inline six” was developed in the Volvo truck magazine “Volvo on the road” where the then head of the truck sector, Lars Malmros wrote:
“To meet the demands for higher impact especially where the provision on 8 hp / tons in Germany registered trucks, some European manufacturers proven engines of 300 hp and stroke volumes of 14 and 17 liters. It is argued that these V-engines become lighter and smaller than the corresponding linear motors. This is true if the comparison is made with conventional naturally aspirated engines, but you have disregarded the fact the development of turbo- supercharging which occurred over the past 15 years. Volvo has (until 1970, authors comments) produced 60,000 diesel engines with turbo since 1954. This unique experience as this has given us, has been instrumental in deciding on the type of diesel engine Volvo heavy trucks to be equipped with.
Since reliability is the first point in our policy, the decision has not been difficult to make. The continued development of engines that are today known for reliability, fuel economy, low weight relative to the output power and low noise and smoke level is natural.
Forecasts show that around 1980 will be required effects of around 500 hp. With the use of intercoolers and variable compression, it is entirely possible to achieve these effects with engines that are slightly larger and heavier and with less fuel than we have today.
Environmental legislation in the future will place great demands on engine noise and exhaust levels. The moderately large, supercharged diesel meets the light of these requirements.
Volvo’s focus is, and will for the foreseeable future remain straight, supercharged six-cylinder diesel engines.”
F89 was a natural development from the five years earlier presented the F88 model. But here was the principle of the “integrated powertrain” even more accentuated. 12-liter engine was certainly developed almost simultaneously with the 1965 featured TD100 engine, but as a whole completely new developed engine and adapted to the higher power of 330 hp gross. However, never seriously discussed any naturally aspirated engine, but engine designers assumed that the turbo would be standard, although competitors in Central Europe still refused to use turbocharging to any appreciable extent, but used normally aspirated engines of up to 17 liter displacement, the V-shape and with up to 10 and 12 cylinders
The heavy gearbox of 1965 was designed to maintaining the reliability and durability of overcoming torque from the TD120 engine, but it was further strengthened, and the name was changed to R and SR61 (initially offered F89 with either an 8 - or 16-speed transmission but the 16-speed soon became standard equipment).
Even the rear axle constructed from scratch witch and was adapted to the newer more powerful engine. The 1962 featured NR1-hub reduction was supplemented with a larger and more powerful NR2-hub reduction, which was delivered as an alternative to the double reduction rear axle was standard. F89 could be supplied with only one drive axis or tandem drive on the bogie
Volvo began 1963 test Intercooler to. It had a 9.6 liter Titan Engine which was 230 hp. With turbocharger and intercooler managed to get 100 hp more the engine stopped at 325 hp. Then they tested another 9.6 engine at a safe and they could scare up to 392 hp. The engine of 325 hp ran for nearly 1 year. Then picked it apart and found in good condition.
It is interesting that Volvo does not fall to make a V-8 engine on the grounds that it would be less work organically, not because it would be too costly. But we can be sure that they the behind “closed doors” has designed a V-engine and tested it. They are not so stupid that they do not. You want to be prepared.
A straight six could probably not develop to any length. Volvo would then go in for a 7 - or 8-cylinder diesel or why not one for biological fuel engine would have problems to hold it in the truck.
Why cylinders 7? It’s not divisible by two. But it may not be a must. I think that I have a Volvo 850 which has 5 cylinders. Why would not a diesel engine have 7 then?
You are welcome to comment on this post. Do you think we’ll see a V engine in the Volvo in the foreseeable future?
Regards FH13 