Re: 130lbs cranking pressure ????
[Re: Wedgeman]
#1016153
06/19/11 10:33 AM
06/19/11 10:33 AM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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Posts: 7,506
Az
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Well, at least you got the same problem in every hole. It's a pretty hefty duration & late intake valve closing, but you are still low IMO. What was the starter cranking speed? Should have been around 500rpm. Did you miscalculated the CR? How far are the pistons down in the hole? Dished pistons? Valve lash set correctly? You might want to run it in a bit and then recheck it. Don't know why you would want to check cranking compression on an engine with no run-in time on it?? - even though I don't think it will come up 60 psi.
Fastest 300
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Re: 130lbs cranking pressure ????
[Re: Crizila]
#1016154
06/19/11 10:41 AM
06/19/11 10:41 AM
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Joined: May 2004
Posts: 1,522 Ste-Sophie, Quebec, Canada
Wedgeman
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pro stock
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OP
pro stock
Joined: May 2004
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Ste-Sophie, Quebec, Canada
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The base of the engine and rotating assy are the same as last yesr...
I double checked the calculations with the new cam specs and results should be there..
I only changed the cam and heads in the equation
Last year was a 250/250* dur cam with valve closing 71* ABDC
Last edited by Wedgeman; 06/19/11 10:42 AM.
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Re: 130lbs cranking pressure ????
[Re: Wedgeman]
#1016157
06/19/11 10:58 AM
06/19/11 10:58 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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Quote:
same piston and ring as last fall....
What did you degree the cam in at... sounds like its retarted
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Re: 130lbs cranking pressure ????
[Re: Wedgeman]
#1016160
06/19/11 11:34 AM
06/19/11 11:34 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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Quote:
I just aligned the dots on the timing gear....
Could I loose 60 lbs if htey were misaligned ?
Dan
Off hand I would say that is your problem... needs to be degreed in
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Re: 130lbs cranking pressure ????
[Re: MR_P_BODY]
#1016161
06/19/11 11:38 AM
06/19/11 11:38 AM
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Joined: Nov 2004
Posts: 4,330 Lynchburg, VA
Leon441
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Lynchburg, VA
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Your cam is retarded.
Once you degree it you will probably find it needs to be advance 4-6 degrees.
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: 130lbs cranking pressure ????
[Re: Leon441]
#1016162
06/19/11 01:01 PM
06/19/11 01:01 PM
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Joined: Nov 2003
Posts: 6,293 Rock Springs
Bob_Coomer
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Rock Springs
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You cant always go by those calculators. What kind of formula are they using to figure this? There is diff types of compression for sure. Even if you advance the cam its not going to be 190 PSI.. It might gain 10 lbs...maybe.. Your over thinking it.. just run it see how it goes.
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: 130lbs cranking pressure ????
[Re: Leon441]
#1016163
06/19/11 01:04 PM
06/19/11 01:04 PM
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Joined: Jan 2005
Posts: 12,478 Kalispell Mt.
HotRodDave
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Kalispell Mt.
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I still don't think you are ever gonna get 190 PSI with that cam and that compression, mabey get close if you advance it a bunch but 10.5 and a cam that big ain't gonna do 190. I do agree it is low but not 60 lbs low. Should always degree it in and you need to re check piston to valve clearance AFTER degreeing it correctly.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 130lbs cranking pressure ????
[Re: Wedgeman]
#1016171
06/21/11 11:08 AM
06/21/11 11:08 AM
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Joined: Jan 2003
Posts: 16,936 NC
440Jim
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Quote:
Cam gear was off one tooth ! got pressure back to 160
Good catch. It would have ran like a dog with 14 degree (1 tooth) error.
One tip. With aluminum heads and a cast iron block, I like to set the cold valve lash 0.004-0.005" tight, so that when hot it will be closer to the cam manufacturer's hot spec. Then check it hot for final setting.
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