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View Full Version : which cc head is this



mxduner
08-03-2008, 10:08 PM
i have a new 310 top end.i have been fighting multiple issues with it, for now i did a compression test on it and only got 160psi out of it. the dome in it now is a ti 21230. is that a 21cc dome ? and what should my compression be?

trx250rider
08-04-2008, 05:37 AM
what kind of head is it...i run a 21 cc dome in my cool head and it will kick 160 to 165 psi everytime

mxduner
08-04-2008, 02:28 PM
I'm pretty sure my engine builder ordered it from esr.

2muchquad
08-04-2008, 10:23 PM
I would assume you have had your cylinder ported?Do you plan on running race fuel?160 isnt bad,remember the actual compression stroke doesnt start until your piston clears the exhaust port so if it has radical porting then your numbers may not be high as you may have hoped.;)

mxduner
08-04-2008, 11:46 PM
I would assume you have had your cylinder ported?Do you plan on running race fuel?160 isnt bad,remember the actual compression stroke doesnt start until your piston clears the exhaust port so if it has radical porting then your numbers may not be high as you may have hoped.
I had my cylinder ported by neil, it is not a radical porting job, rather a mx port.I am just trying to determine what i should have and figure if it was normal vs. a problem.this top end has maybe 1 tank and a half on it, and i have ZERO reasons to believe it has a problems, so i was just curios what i should have for compression with this head.thanks