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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
I just did a 128 FM kit 11:1 Comp with a 520 lift cam and stock heads. Did a compression test and getting 245 psi on rear cylinder and 235 front. FM said should be at 220 with my setup . Is my compression too high? Also getting pool of oil in TB and I have the Trask vented trans cover so not sure whats going on. Any suggestions would be appreciated
Greater than expected CCP is common for M8 builds. I've seen stock engines pump 245+ with a bolt in cam. Externally vent the crankcase breathers to a catch can, instead of the intake tract, to remove that oil mist.
Greater than expected CCP is common for M8 builds. I've seen stock engines pump 245+ with a bolt in cam. Externally vent the crankcase breathers to a catch can, instead of the intake tract, to remove that oil mist.
Not entirely sure what you mean by crankcase breathers. I did install the Trask CheckM8 vented transmission top to help with this but doesnt seem to be effective.
ok. Because I dont think its from breather bolts my air filter is completely dry and oil free. This oil is pooling right behind TB plate and seems to settle after I turn the bike off after riding.
ok. Because I dont think its from breather bolts my air filter is completely dry and oil free. This oil is pooling right behind TB plate and seems to settle after I turn the bike off after riding.
I was under the impression that you tested it before first start, and never ran it yet.
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CCP 245 psi !
