head design

[slider84]

eric whats the best way to set up a head for methanol fuel for a road racing sidecar. my compression ratio is set at 13/1 . full stroke. peak rpm is 9000 just not sure on the squish area and more important the MSV. it an kawasaki h2 750 :ride:

 

[Eric Gorr]

Normally you want a wide squishband say 60% of the bore area with a 2 degree greater angle than the piston, and a minimum squish clearance at the edge of 1mm

An H2 with a sidecar? I never thought of using a sidecar to make tose bikes handle, thats very clever!

 

[slider84]

i thought you have to reduce the squish area for roadracing and increase for enduro / motorcross.
why such a large % , dont forget its on methonal

 

[slider84]

this would put the msv at about 50 to 60 m/s. why so high. i dont want to blow anything up

 

[Pete Payne]

Eric,
What should the comp ratio be ???
What should the MSV rating be ??? 30 - 40 M/S ????