dynamic compression calculator available
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Yep. It's been in about 1/2 of my recent posts too.
http://www.kb-silvolite.com/calc.php?action=comp
http://www.kb-silvolite.com/calc.php?action=comp
Posting Guru
Joined: Nov 2005
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From: the side of a mountain
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Posting Guru
Joined: Jul 2003
Posts: 2,232
Likes: 1
From: Colville, Washington
I entered my 428+.030 engine specs and came up with 9.146 dynamic compression. I run it on 87 octane with no pinging issues unless I load it down in a high gear.
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Posting Guru
Joined: Jul 2003
Posts: 2,232
Likes: 1
From: Colville, Washington
The quench on my combo is about .040-.045. I am not sure on the Victor gasket thickness.
1.Stant 180 degree
2. Victor stock replacement
3. TRW L2303NF+.030
4. Varies from 1600 to 5200 feet above sea level
5. C1AE-A ported by myself
I think some of it is the very clean combustion chamber(nearly polished) and the extensive exhaust porting, altho i am running Dynomax headers(ports too small). The head chambers were some of the cleanest after running for 70000 miles that the local machinist had ever seen...in over 15 years of engine rebuilding. Or maybe I am just lucky!!
1.Stant 180 degree
2. Victor stock replacement
3. TRW L2303NF+.030
4. Varies from 1600 to 5200 feet above sea level
5. C1AE-A ported by myself
I think some of it is the very clean combustion chamber(nearly polished) and the extensive exhaust porting, altho i am running Dynomax headers(ports too small). The head chambers were some of the cleanest after running for 70000 miles that the local machinist had ever seen...in over 15 years of engine rebuilding. Or maybe I am just lucky!!
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Huh. According to this article, (the chart is at the bottom), you should need about 95 octane:
http://www.popularhotrodding.com/tec...power_squeeze/
I guess for every rule there's an exception! That thing must be tuned to perfection.
http://www.popularhotrodding.com/tec...power_squeeze/
I guess for every rule there's an exception! That thing must be tuned to perfection.
Posting Guru
Joined: Jul 2003
Posts: 2,232
Likes: 1
From: Colville, Washington
Perfection-no, but I have tinkered with it for 24 years(the truck) and nearly 10 years with the present engine. The previous 390 had 9.4:1 and did not ping either(same heads), but larger cam.
We seem to have got a bit off the original topic
Sorry 
We seem to have got a bit off the original topic
Sorry
Thread Starter
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Posting Guru
Joined: Aug 2005
Posts: 1,036
Likes: 1
From: NE Ga
(meant for previous post-too quick to hit enter)
See this is what i need to hear...guys that have been there done that. Not that your quench ideas are wrong by any means kurt but i have a really hard time building a $2500 motor by the specs of what someone (whom i don't know and haven't seen his work) just told me online. I think you're right about quench to a certain point but for whatever reason it just hasn't lined up with the engines i've seen in the past. Again i'm not bashing you at all kurt, you seem to really know your stuff but i've gotta have hard evidence to know what i'm doing is right, otherwise i would've taken the first guys advice and who knows what i would have built. Anyways thanks Putt for the input and fyi i'm going with victor gaskets too and mine are said to compress to .035 so we'll see!! i'm getting real excited as i should be building and running this thing here in 2 weeks! wish me luck and i'll keep ya'll posted as to how she turns out!
See this is what i need to hear...guys that have been there done that. Not that your quench ideas are wrong by any means kurt but i have a really hard time building a $2500 motor by the specs of what someone (whom i don't know and haven't seen his work) just told me online. I think you're right about quench to a certain point but for whatever reason it just hasn't lined up with the engines i've seen in the past. Again i'm not bashing you at all kurt, you seem to really know your stuff but i've gotta have hard evidence to know what i'm doing is right, otherwise i would've taken the first guys advice and who knows what i would have built. Anyways thanks Putt for the input and fyi i'm going with victor gaskets too and mine are said to compress to .035 so we'll see!! i'm getting real excited as i should be building and running this thing here in 2 weeks! wish me luck and i'll keep ya'll posted as to how she turns out!