hi compressions: wasDIY_EFI Digest V1 #258

[John Faubion]

> John Faubion wrote:
> > 
> > Actually the big reason for multivalve chambers is more area is exposed
> > around the valve to flow fuel. Two small valves have much more flow
> > capacity than 1 large valve but is more expensive that manufacture.
> 
> That's also what Yamaha though, they went to 5 valves to get even more
> flow.  They did pick up flow, but on the F1 motors the 4 valve engines
> made more power still.  
> Point is.  It's not all flow, but combustion chamber shape and flame
> propogation as well.

I agree in as much as with everything there is a break even point.
Considering how crowded a four valve chamber is and how the two open valves
affect each others flow, I can only imagine the problems with three open
valves!

John Faubion
jfaubion at beaches.net