Is cylinder pressure ok?

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11-12-2005, 11:52 PM
bowtieorbust

Is cylinder pressure ok?

Hey guys;) Got a ? about my .030, 9.0:1 c/r, 350sbc, it also has KB120 hyper flats, with moly rings, and are .010 in the hole. A set of World S/R torquers, on .028 GMPerformance head gaskets, which yelds a .038 qwench. The cam i went with is a Retro-Roller (EX270HR) from Comp, with a (.495in - .502ex)(218in - 224ex @50)(110 L/S), plus the cam has (61 deg's) of intake closing ABDC. I dialed the cam in the way that Comp recamended me to, and the runs great. I did a compression check, and found that i have about 150psi at all 8 cylinders. The motor is not broke in yet, and was wondering if 150psi is a little low, or will it get better after the motor gets broken in. (Please Advise):confused:
11-13-2005, 04:05 AM
erik erikson

Re: Is cylinder pressure ok?

Quote:

Originally posted by bowtieorbust
Hey guys;) Got a ? about my .030, 9.0:1 c/r, 350sbc, it also has KB120 hyper flats, with moly rings, and are .010 in the hole. A set of World S/R torquers, on .028 GMPerformance head gaskets, which yelds a .038 qwench. The cam i went with is a Retro-Roller (EX270HR) from Comp, with a (.495in - .502ex)(218in - 224ex @50)(110 L/S), plus the cam has (61 deg's) of intake closing ABDC. I dialed the cam in the way that Comp recamended me to, and the runs great. I did a compression check, and found that i have about 150psi at all 8 cylinders. The motor is not broke in yet, and was wondering if 150psi is a little low, or will it get better after the motor gets broken in. (Please Advise):confused:

THIS IS FINE FOR A PUMP GAS APPLICATION.YOU MIGHT PICK UP A LITTLE MORE WHEN THE RINGS BEGIN TO SEAT BUT NOT MUCH.
11-13-2005, 07:52 AM
bowtieorbust

ThanX for the responce (erik erikson), the motors in my project pu, which is still under construction. It problebly wont be untill after winter, untill i get the truck ready to roll, because it still needs all the stuff to make the brakes work. So all i can do right now is let the motor idle awile.:CRY:
11-13-2005, 08:41 AM
81 cabellero

your camshaft overlap will determine cranking compression as well.....yur 270 cam has a tight lsa and an overlap of 56 degrees i beleive.....but the fact that you are even in all cylinders is a good start.....sounds like a good motor....but carefull when idleing a new cam.....they dont like to idle for long periods.....what i do for mine that has a 270h in it is i let it run at about 1500 to 2000 to warm it up and this keeps oil on the camshaft......then when its hot i shut it off......
11-13-2005, 11:25 AM
bowtieorbust

ThanX guys for the heads up on idleing the motor, because of the glazing of the cylinders.:D