2 replies to this topic

[Sisyphus]

I've looked through my books and this Forum but have not been able to find the bore spacing for the 4 cylinder 1.5 liter and 2.5 liter FP Climax engines.  I think they may have been the same although that seems like a stretch.

 

I can find valve sizes, bores, strokes, but nothing on the bore spacing other than a note that the 1.5 liter V-8 may have had the same spacing due to tooling constraints.

 

Thanks, in advance, for the info or a reference where I can find the answer.

[Macca]

One of the articles by the original engineers in one of my books gives 4.175 inches for all the 4-cylinder engines, but I cannot find anything for the FWMV.

Paul M

Edited by Macca, 29 June 2021 - 09:58.

[Sisyphus]

Thanks, Paul!

 

I found a reference to the V-8 (FWMV) using the same bore spacing as the 4 cylinders in an old posting by David Beard referencing a preso by Wally Hassan:

 

 

The following is from a paper by Wally Hassan presented to the SAE at Cleveland Ohio..
 

Quote

When it came to the question of the 21/2 litres which was
required to have a real crack at the Grand Prix races,
we were faced with a problem of considerable modification
but with the necessity of retaining the ability to machine the
major components on existing jigging. We
were, therefore, tied to the existing cylinder centres, main
bearing stud centres, and only a very small variation in
cylinder head stud centres.
It was decided to overcome the crankcase failures by
reducing the skipping rope effect. of the underbalanced
shaft by utilising the rather expensive heavy alloy
marketed by the G.E.C. This is a sintered tungsten having
a specific gravity 1.6 times that of lead. By this means we
were able to re-establish 100 per cent rotating weight
counterbalance within the crankcase walls. We also made
the main bearing caps of 40ton steel, which gave improved
rigidity, and the facility of arranging studs through the crankcase
side walls into the bearing caps, effectively tying the crankcase
and the bearing caps together in the horizontal plane.