Easiest way to estimate/measure the minimum intake port cross section?
#2
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Re: Easiest way to estimate/measure the minimum intake port cross section?
its usually at the pushrod pinch area, which can be measured pretty easily with basic measuring devices...
#3
Re: Easiest way to estimate/measure the minimum intake port cross section?
Originally Posted by rskrause
Anyone have any hints on the easiest way to do this for a given set of heads?
Rich
Rich
Feel like hearing a wild-assed idea that might actually work?
Set your head on a bench, use some Pam or something similar to grease up the port, then spray in some of that "minimally-expanding" foam you can find at home depot. When it sets you can pull it out from the larger of the two sides. Probably best if you don't completely fill the port, just fill enough to give you a good mold at the pinch point.
I don't know if that'll work for you, but it should only cost about $5 to try it.
#4
Re: Easiest way to estimate/measure the minimum intake port cross section?
I'll send you my spreatsheet on this Rich...
BTW if you search ole Mindgame's posts in LT1 tech he got into a heated discussion with Larry Ross about this topic and gave out all the calculations for it.
Bret
BTW if you search ole Mindgame's posts in LT1 tech he got into a heated discussion with Larry Ross about this topic and gave out all the calculations for it.
Bret
#5
Re: Easiest way to estimate/measure the minimum intake port cross section?
Originally Posted by SStrokerAce
I'll send you my spreatsheet on this Rich...
BTW if you search ole Mindgame's posts in LT1 tech he got into a heated discussion with Larry Ross about this topic and gave out all the calculations for it.
Bret
BTW if you search ole Mindgame's posts in LT1 tech he got into a heated discussion with Larry Ross about this topic and gave out all the calculations for it.
Bret
Thanks for the ideas so far, I may try the foam thing. I'm glad no one said you have to cut the port in half.
Rich
#6
Re: Easiest way to estimate/measure the minimum intake port cross section?
CUT THE PORT IN HALF!
That's for, "Not understanding the desire to run 18º heads on an LT1" Rich.
Lame, that's a darn good idea. I'll have to try that some time. One other way you can do it is to use a yankee caliper. Don't know if they have another name... that's just what I've always heard them called. The one on the left is the tool you're after.
Companies also make them with a dial on the end, but those have to be set with a micrometer and have a range of 1".
In regards to minimum cross section and true race heads... most of them aren't smallest at the typical pinch point but usually are smallest somewhere at or before the short side. Just from what I've seen anyways.
HTH.
-Mindgame
That's for, "Not understanding the desire to run 18º heads on an LT1" Rich.
Lame, that's a darn good idea. I'll have to try that some time. One other way you can do it is to use a yankee caliper. Don't know if they have another name... that's just what I've always heard them called. The one on the left is the tool you're after.
Companies also make them with a dial on the end, but those have to be set with a micrometer and have a range of 1".
In regards to minimum cross section and true race heads... most of them aren't smallest at the typical pinch point but usually are smallest somewhere at or before the short side. Just from what I've seen anyways.
HTH.
-Mindgame
Last edited by Mindgame; 04-27-2005 at 07:16 AM.
#9
Re: Easiest way to estimate/measure the minimum intake port cross section?
Originally Posted by rskrause
Thanks for the ideas so far, I may try the foam thing.
Originally Posted by jdizzell
For performance heads.. 90% of valve area
For street heads........... 85% of valve area
For street heads........... 85% of valve area
Originally Posted by SStrokerAce
Sometimes..... all depends on the throat diameter... it might be that small might not.
Last edited by arnie; 04-29-2005 at 09:31 PM.
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