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Re: Low comp. + no quench vs. high comp. + quench???
[Re: an8sec70cuda]
#2122939
08/01/16 09:55 PM
08/01/16 09:55 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Whats the cam installed at... back it off a couple degrees so it would have less compression(the piston would be higher in the cyl).. if your like the rest of us we tend to advance them at least 4* or more for more low end
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Re: Low comp. + no quench vs. high comp. + quench???
[Re: an8sec70cuda]
#2123010
08/01/16 11:16 PM
08/01/16 11:16 PM
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Joined: Nov 2003
Posts: 5,160 Texas
dannysbee
master
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master
Joined: Nov 2003
Posts: 5,160
Texas
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I had a 451 low deck with kb quench dome pistons and 452 heads a 223 230 at 50 cam that had 10.6 compression. It ran on pump gas on all but the hottest days. When the weather was 90+ I would add 2-3 gallons race gas. Quench was .038
Getting old just means you were smarter than some and luckier than others.
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Re: Low comp. + no quench vs. high comp. + quench???
[Re: an8sec70cuda]
#2123069
08/02/16 12:17 AM
08/02/16 12:17 AM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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I ran 10.2.1 iron headed 451 with a 284xe juice cam for 16 years no issue with an auto and loose converter. Swapped to a manual and ping city. Colder plugs and 33 total quieted it down but lost power for sure.
Mopar to the bone!!!
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Re: Low comp. + no quench vs. high comp. + quench???
[Re: 72Swinger]
#2123114
08/02/16 01:25 AM
08/02/16 01:25 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I would use different gaskets & shoot for .035" quench (to get EFFICIENT quench). & precision measuring as in my exp listed gasket thicknesses (compressed and uncompressed) can be a mile off (10-15 tho is a mile off). But on the Q at hand I ain't optomistic on avoiding quench (gas is crap & getting worse). post what you go with & how it turns out
live every 24 hour block of time like it's your last day on earth
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Re: Low comp. + no quench vs. high comp. + quench???
[Re: an8sec70cuda]
#2123228
08/02/16 09:50 AM
08/02/16 09:50 AM
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Joined: Jan 2003
Posts: 10,011 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,011
Frostbitefalls MN (Rocky&Bullw...
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I agree with changing to a distributor you can set up with less initial, and ramp in total to match the motor. Also, anything you can do to cool the intake charge will help, obviously. Since you plan on a better motor soon, you might as well just work with the 906 heads for now, unless you want to know just how much the closed chamber heads will change things.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Low comp. + no quench vs. high comp. + quench???
[Re: an8sec70cuda]
#2123398
08/02/16 01:56 PM
08/02/16 01:56 PM
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Joined: Jan 2003
Posts: 75,071 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,071
U.S.S.A.
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Chip it can't be any worse than it is... do it ...
I did a KB quench piston motor for a friend a number of years ago, it was an identical build as another KB piston motor another friend had , the only difference was one motor had the quench number at no more than .045, the other motor was .050 plus.
The tight motor had 10.3 compression, the loose one was 9.5. The tight motor ran fine on 93 octane from the pump, the 9.5 motor would ping if the owner ran anything lower than 93, i would have expected 89 to be ok.
running up my post count some more .
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