".035 to .045 quench will promote detonation" - Team Camaro Tech
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post #1 of 11 (permalink) Old Feb 13th, 07, 01:31 PM Thread Starter
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Dave
 
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".035 to .045 quench will promote detonation"

That's what an engine builder told me today. I needed someone to drill steam holes and he started asking me questions about my combo. He said you don't want a tight quench, that >.045 would be better/safer on pump gas. I'm going to ignore his comment.

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post #2 of 11 (permalink) Old Feb 13th, 07, 02:17 PM
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Chad
 
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Re: ".035 to .045 quench will promote detonation"

And you're going to let him drill your steam holes??

My understanding is there are quite a few people running around without steam holes...and suffering no issues whatsoever. Maybe it depends on the engines setup.

I need to ask my father about that, he just built a 400 for 70 Chevelle, and I don't think he drilled steam holes.

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post #3 of 11 (permalink) Old Feb 13th, 07, 02:50 PM
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Re: ".035 to .045 quench will promote detonation"

I think your engine guy is slightly confused

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post #4 of 11 (permalink) Old Feb 13th, 07, 03:28 PM
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Re: ".035 to .045 quench will promote detonation"

i would drill my own holes





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post #5 of 11 (permalink) Old Feb 13th, 07, 04:23 PM
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Re: ".035 to .045 quench will promote detonation"

.040 quench here and all good.
No holes here and no problems even hot lapping at the strip. I also keep it above 2500 rpm (10" 3000 stall helps that )

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post #6 of 11 (permalink) Old Feb 13th, 07, 07:19 PM
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Mike
 
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Re: ".035 to .045 quench will promote detonation"

Please tell me about the steam holes.

Where are they drilled and where is the steam coming from and where does this steam go?

Just learning as I go.....
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post #7 of 11 (permalink) Old Feb 13th, 07, 07:26 PM
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Re: ".035 to .045 quench will promote detonation"

He is mistaken for sure, that is the ideal range to help resist detonation.
Steam holes are NOT needed unless you plan on sitting at an idle for hours on end every day, thats the only reason chevy drilled them in the first place. I as well as everyone I know have no steam holes in our 400's, with zero problems. This will no doubt start a huge debate, so I'll leave it at that. Try searching "steam holes" and you'll see my opinion as well as others on them......trust me
However if it makes you feel better, have somebody else drill them for you, I think I have lost faith in your machinist.....

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

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post #8 of 11 (permalink) Old Feb 13th, 07, 07:34 PM
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Sean
 
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Re: ".035 to .045 quench will promote detonation"

Mike,
On 400's the bores are siamesed, or connected at the side that joins the next cylinder in line. The 400 bore was larger and required this to fit in the smallblock package as it was. In cars that sat for hours idling etc., steam would build up at the point under the deck where the cylinders joined, creating steam pockets. They drilled holes at the two center cylinders from the block to the heads to complete the water jacket path when water was flowing at its slowest, i.e. idling. It was necessary to do because these motors went into vans, trucks and taxicabs, and the steam would build apparently at under 1800 rpm or so. In a car such as our Camaros the water flows well enough because they are driven, to never necessitate the holes. You always hear people say you need to drill them, but never an account of a time they personally didn't and had problems, it's just one of those things I guess....
Now I can tell you of incidences people decided to drill the holes and drilled them wrong........

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

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post #9 of 11 (permalink) Old Feb 14th, 07, 09:25 PM
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Re: ".035 to .045 quench will promote detonation"

The Chevy Power book has diagrams on how to drill the holes properly.


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post #10 of 11 (permalink) Old Feb 15th, 07, 06:45 AM
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Tom
 
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Re: ".035 to .045 quench will promote detonation"

Quote:
Originally Posted by SooperDave View Post
That's what an engine builder told me today. I needed someone to drill steam holes and he started asking me questions about my combo. He said you don't want a tight quench, that >.045 would be better/safer on pump gas. I'm going to ignore his comment.
RUN AWAY from this no-nothing "Engine Builder"
It appears he has garnered his "Knowledge" at the local diner over coffee,,or the "Dew Drop In" over brews.

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post #11 of 11 (permalink) Old Feb 15th, 07, 05:09 PM
 
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Re: ".035 to .045 quench will promote detonation"

All I'm gonna say is that FORD thought enough of bleeding off any steam that might form between the siamese cylinders that they jig drilled parallel under the decks bleed holes between cylinders from the valley on their NEW hi-po 5.0 block that's supposed to be good for boo-coo hp so go from there!!!!!!!!!!!!

pdq67



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