Hi again Monty.
I have a question,
since i found out that the Piston and sleeve for the +4 is actually 10 years old and europeanchampion ( novarossi CLB engine), it is funny that it now is in the wind like hell... LOL. Ocouarse, there are several other factors like crankshaft, crakcase volum etc.
And here is were the question come in,
I have several spesial crankcases from Recab in France that is black hardcoated Crono RS5. That engine was the same engine like the P5 internals but a little different crankcase. It is smaller by the looks and it seems smaller i crankcase volume than the P5.
So, what happends when the crankcase volume decrease? I would assume you get a little bit better response but maybe also loose a littlebit of revs?
Inerestingly, the RS5 was a little smoother than the P5`s i got but, when i messure the crank and port timings, they are identical.... So my guesses is that i am wrong when i say better response...
Thanks for the help!!
the rs5 had a 5+2 design with smaller rear main intake and smaller vertical transfer ports but came with the tri-spit competition filled crank. i liked that setup
the crono 4tclb was a completely different engine
ssshhhh!!!!
the difference between the p5 and p4 is the o.d. of the sleeve , i would venture to say it really has nothing to do with porting or volumes as much as it has something to do with expansion/contraction rates
hope this helps
,
monty
a great engine is a great engine whether its 10 yrs. old or the latest greatest break through