Compression Gauge
Road Warrior
Joined: Mar 2013
Posts: 1,923
Likes: 587
From: Alorton, Illinois
I have several but the one I trust and had tested is an old generic with the glass busted out.
One thing to keep in mind with calculators. Cam card give us info at .053 tappet lift. See cam card in .050 and .053 and having a whole degree change with a .003 difference. Pinion sprockets don't always fit the tightest and can cause a change. To get better numbers. Degree the cam.
Road Warrior
Joined: Mar 2009
Posts: 1,485
Likes: 232
From: Ohio
- A calibrated one. Anything else is just a guess.
Stellar HDF Member
Joined: Oct 2013
Posts: 2,575
Likes: 3,171
From: Lake Geneva WI
I don't really take a compression tester's readings as the end all. As long as it's within 10% or so. When testing compression, what im more concerned about is consistent numbers with the cylinders.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,899
Likes: 8,006
From: poway
Unless everything is measured, it's a crap shoot.. If the motor seems to run well, doesn't ping, find an exhaust system that gives better low end torque. IMO the heads are probably a little too big for the motor if you want low end torque.. Sometimes advancing the cam helps but it will raise the CCP a few psi.
Road Warrior
Joined: May 2011
Posts: 1,956
Likes: 439
From: florida
If the 220 or 210 reading was correct then the bottom end wouldn't feel soft.
If the exhaust is solid and you didnt go too nuts on the valve sizes then just live with it or swap to a better low end grunt cam. I have a buddy that feels his 625 @200ccp is bottom soft too... surprised me.
If the exhaust is solid and you didnt go too nuts on the valve sizes then just live with it or swap to a better low end grunt cam. I have a buddy that feels his 625 @200ccp is bottom soft too... surprised me.
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Stellar HDF Member
Joined: Mar 2012
Posts: 2,017
Likes: 599
From: Columbus, OH
Unless everything is measured, it's a crap shoot.. If the motor seems to run well, doesn't ping, find an exhaust system that gives better low end torque. IMO the heads are probably a little too big for the motor if you want low end torque.. Sometimes advancing the cam helps but it will raise the CCP a few psi.
If the 220 or 210 reading was correct then the bottom end wouldn't feel soft.
If the exhaust is solid and you didnt go too nuts on the valve sizes then just live with it or swap to a better low end grunt cam. I have a buddy that feels his 625 @200ccp is bottom soft too... surprised me.
If the exhaust is solid and you didnt go too nuts on the valve sizes then just live with it or swap to a better low end grunt cam. I have a buddy that feels his 625 @200ccp is bottom soft too... surprised me.
Funny how these threads end up, I was really wanting to discuss what others are using to test their compression and how far they are off of calculated compression. I do think the most important thing is to use the same gauge every time it's checked.
If no one feels that 220 CCP is out of the ordinary for a 10.5:1 with a 41* intake close then I'm not concerned about it. Gonna ride it like I stole it, beat it like it owes me money and when the bottom end goes I'll start a big motor build thread
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