Question, with the lower piston speeds, will you get a drop in intake and exhaust gas velocity
At this stage I can't give you a definitive answer on that, the piston will travel a shorter distance for each turn of the crank, thus it will travel slower for the same rpm.....I'm not going to make claims that I can't support but I believe that there is sense in the explanation that was given to me by a guy called Jack Dolan who has a long history in landspeed racing in the States. He built the motors for Don Vescoes record setting Kawasaki streamliner. As he put it "people are always trying to get more out of motors , bigger ports, bigger valves, longer strokes for more torque, I figured I could turn that on it's head". He went on to make the point that people are always trying to bend the rules not interpret them. "Everybody wants heads that will flow massive figures.....well why not put reasonable heads on a little motor ...and run in a class that it fits in?"....
That's what we're figuring......we've got some decent heads, they might run like crap at lower revs but at the point when the 3.8 starts to run out of puff, the 3.0 will be trying to pull about 22per cent less air through the ports. That, and the lower stresses ( and losses)on the piston/rod/pin assembly we hope will make for a motor that will rev toward 8 grand and still be making power .....and not coming apart.We'll be up against a Supra motor in that class run by some guys who said we'd never go fast with the V6, we're going fast now but it'd be nice to destroke it to F class , and see what we can do...
what are the big end journal sizes on the 3 litre crank?
I'll get back to you on that, from memory we aren't in for any surprises....but I'll fill you in soon, the crank should be here within days.......