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03-10-2010, 07:54 AM | #1 |
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Cranking Pressure?
I just checked my cranking pressure with a compression gauge. And was shocked by the number (close to 300 pounds). The motor starts up fine without bucking. And seems to make good power, picked up 3+ mph over last years motor.
This years motor has 14.5 to 1 compression and 30 more degrees duration in the cam, than last years 12 to 1 motor. Should I be worried about the high number?
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Art Leong 2095 SS |
03-10-2010, 09:27 AM | #2 | |
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Re: Cranking Pressure?
Quote:
I really dono. were at 220-218 on ours at about 12.5:1 so.....If that helps any.
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Chris "Drooze" Wertman 3132 (F/SA 2009 Challenger Drag Pak #24 with a best of 10.59) |
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03-10-2010, 10:09 AM | #3 |
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Re: Cranking Pressure?
I wonder if my hydraulic lifters are collapsing a bit decreasing cam lift and duration, when I test the motor. I almost can't believe the numbers. The motor starts to easy and runs well.
What does cranking pressure effect?
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Art Leong 2095 SS |
03-10-2010, 10:20 AM | #4 |
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Re: Cranking Pressure?
And runs records
Maybe this will help, I dont know if the calc is in Pipemax, I dont have it on this computer http://www.not2fast.com/turbo/compre...pressure.shtml http://www.chevyhiperformance.com/te...ion/index.html
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Chris "Drooze" Wertman 3132 (F/SA 2009 Challenger Drag Pak #24 with a best of 10.59) |
03-10-2010, 10:54 AM | #5 | |
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Re: Cranking Pressure?
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The gauge is a brand new gauge so I'm going to borrow one and see if it is the same.
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Art Leong 2095 SS |
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03-10-2010, 03:02 PM | #6 | |
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Re: Cranking Pressure?
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Chris "Drooze" Wertman 3132 (F/SA 2009 Challenger Drag Pak #24 with a best of 10.59) |
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03-22-2010, 06:49 AM | #7 |
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Re: Cranking Pressure?
Hi Art, cranking pressure CAN be affected by your lifters not pumping up. I would say that 300 psi is too much but then I was taught to try and keep cranking pressure "more than 160 and less than 210" and I could have been taught wrong. When I was running really high compression Bracket stuff (15 to1) I was only winding up with about 210 but I was using pretty big cams.
If anybody has any other opinions I'd like to hear from them.
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Billy Nees 1188 STK, SS Reality, what a concept! |
03-24-2010, 09:47 PM | #8 | |
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Re: Cranking Pressure?
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It slowed the car up. Put the cam back and I got the power back. I had to change the timing offset. when i retarded the cam. Then I had a brain fart and forgot which program I had in there (there are 13 different fuel curves). It took me 5 runs to figure it out, wasting a test and tune day.
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Art Leong 2095 SS |
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03-25-2010, 06:27 AM | #9 |
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Re: Cranking Pressure?
Art, did you check it with a plugged lifter yet?
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Billy Nees 1188 STK, SS Reality, what a concept! |
03-28-2010, 11:16 AM | #10 |
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Re: Cranking Pressure?
No I have just come to the bare fact that it it's running right don't mess with it If you do You will find something wrong.
The motor is making great power I still am close to getting in trouble with me shifting 1500 short. Even I am wondering "where the turbo is hiding"LOL I seem to have worried myself silly (something I'm real good at) for a couple of weeks for nothing. It's like the movie Dr Strangelove, or How I learned to stop worrying and love the Bomb.
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Art Leong 2095 SS |
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