Re: Is a .050" quench height still effective?
[Re: BradH]
#878837
12/13/10 11:05 AM
12/13/10 11:05 AM
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Joined: Jan 2003
Posts: 75,047 U.S.S.A.
JohnRR
I Win
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I Win
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Posts: 75,047
U.S.S.A.
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Re: Is a .050" quench height still effective?
[Re: BradH]
#878843
12/13/10 12:55 PM
12/13/10 12:55 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 would rather have the tighter quench with 11.00 to one than the .050 with 10.8 to one. I ran a 10.8 to one cast iron head with .038 with a .223 at 50 cam for years on 92 pump gas. Only time I had any problem was when the temp got in the high 90's. You would hear just a little in high gear. Couple gallons of race gas would fix it. With aluminum heads better combustion chamber shape and more cam duration I would think you would be OK.
Getting old just means you were smarter than some and luckier than others.
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Re: Is a .050" quench height still effective?
[Re: maximum entropy]
#878849
12/13/10 02:41 PM
12/13/10 02:41 PM
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Joined: Aug 2004
Posts: 2,128 sweden
sshemi
top fuel
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top fuel
Joined: Aug 2004
Posts: 2,128
sweden
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Quote:
i know how much you value my input ( ), so i urge you to keep that quench as tight as possible! i've built several hot street engines with compression ratios close to 11:1, with very good results, as long as the quench is super tight. they've all been between .035 and .039. my personal mill started at .055, and had some issues in hot weather, that were completely ameliorated when i brought it to zero deck. i am the quench nazi because of this experience.
Was that the only change you did???
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Re: Is a .050" quench height still effective?
[Re: Streetwize]
#878852
12/13/10 04:19 PM
12/13/10 04:19 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
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Posts: 15,439
Val-haul-ass... eventually
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I'm seeing a pattern here... FWIW, the pistons stick out of the deck .002", so quench will be .038" w/ a typical composition gasket. I haven't assembled the thing, yet. However, I've collected most of the parts already. I don't know if I'll have to band-aid the 11.0 CR w/ a longer duration cam or not at this point.
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Re: Is a .050" quench height still effective?
[Re: sshemi]
#878853
12/13/10 04:40 PM
12/13/10 04:40 PM
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Joined: Feb 2007
Posts: 5,080 organ
maximum entropy
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master
Joined: Feb 2007
Posts: 5,080
organ
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Quote:
Quote:
i know how much you value my input ( ), so i urge you to keep that quench as tight as possible! i've built several hot street engines with compression ratios close to 11:1, with very good results, as long as the quench is super tight. they've all been between .035 and .039. my personal mill started at .055, and had some issues in hot weather, that were completely ameliorated when i brought it to zero deck. i am the quench nazi because of this experience.
Was that the only change you did???
i put in a slightly smaller cam, which would have made the problem worse. i hoped that the improved quench would help the situation (not that it was that bad), and to my surprise, the hot weather pinging has vanished. the car is faster, too btw. 1/2 a tenth.
for what is the good life if not doing things thoughtfully?
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Re: Is a .050" quench height still effective?
[Re: moparniac]
#878855
12/13/10 08:16 PM
12/13/10 08:16 PM
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Joined: Dec 2008
Posts: 1,200 UK
602heavy
pro stock
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pro stock
Joined: Dec 2008
Posts: 1,200
UK
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Quote:
Quote:
I don't know if I'll have to band-aid the 11.0 CR w/ a longer duration cam or not at this point.
I also was at 11.12 to 1 in my challenger and I raced on 93 pump gas with that also! with a puny 248/254 @ 50 roller with more than .050 quench.... however The cam was 69 Intake valve closing ABDC..... ever wonder why wallace wants to know this on his dynamic calc? the higher the number the more its bleeds of cylinder pressure...
Does early intake valve closure have a direct bearing regards detonation? , maybe excessive overlap (ex bias) has more influence than we think.. , lots of variables to think about regards valve events.
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