compression,or lack of

Post by **Johnno** » Tue Jun 27, 2006 8:43 am

Hiya all,just checked the compression on my sidevalve.Seems to be low.What should I expect to get?By low I mean less than 100.Pistons are a good fit in bore and no smoke from exhaust.All the best,John.

Post by **Scott** » Tue Jun 27, 2006 11:11 pm

I can't say if 100psi is low or not but the sidevalve is a very low compression engine anyway. I could give mine a test if you like & let you know what I have.

Are all the cylinders around the 100psi mark ?
Have the valves been reseated & adjusted correctly ?

Post by **Onne** » Wed Jun 28, 2006 9:18 am

all I know is the compression ratio is 6,6:1 on the sidevalve, and 8,5/9,5:1 on the 1098

Post by **Scott** » Wed Jun 28, 2006 10:25 am

My sidevalve has 130psi. It's 0.060" oversize in the bore & the head's been skimmed so that might explain the difference with yours.

Post by **Johnno** » Wed Jun 28, 2006 6:50 pm

Cheers Scott,Thanks for taking the trouble to check yours.Looks like I have a problem or two!!Thanks also Onne,thats useful information.All the best,John.