113 porting ???'s
Burning Brakes
Joined: Jun 2005
Posts: 884
Likes: 0
Shawn I have all the flow #s on the heads and the dyno #s on that motor,the motor was in Wheelsup 's 1991 do a search on him 
I also have a set of AFR heads from tpis on my 1990 IROC the 113s are just as nice and that motor is right she is ready to run again!!!!
I also have a set of AFR heads from tpis on my 1990 IROC the 113s are just as nice and that motor is right she is ready to run again!!!!
Safety Car
Joined: Jun 2000
Posts: 4,870
Likes: 25
From: Long Island, NY
I know Lingenfelter used to have a CNC program for the 113 heads which gave great results. They build thier 383 with the 113 heads.
Lingenfelter was more concerned with velocity than flow.
Vic
Lingenfelter was more concerned with velocity than flow.
Vic
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by Vic'89
Lingenfelter was more concerned with velocity than flow.
Vic
Vic
But all you have to do is look at all the posts on cylinder head power production and what you see if CFM, CFM, CFM flow. You can count on one hand the number of times velocity is discussed and examined.
Maybe because there's no NUMBER associated with velocity. I've written this many times before, but most DROOL over flow numbers and fail to recognize they are only one part of the equation.
What can be done to change that kind of thinking??
Jake
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Good post, Jake, wish there was an answer. Theres times when someone will post question regarding say, a Vortec head for his combo but will get shot down by someone saying they are no good because theirs flow 300 cfm.
Unfortunately everyone swears/builds by the max cfm and cant figure out why it "just isnt right". Guess the marketing works , eh?
Unfortunately everyone swears/builds by the max cfm and cant figure out why it "just isnt right". Guess the marketing works , eh?
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Le Mans Master
Joined: May 2000
Posts: 7,033
Likes: 12
Explain to me how flow and velocity aren't related. If a head has low velocity it wouldn't have much flow, correct? Velocity does what for airflow inside the combustion chamber, would you say it is for swirl?
I think the #s people need to look at closer are the medium lift numbers. The valve is in that postition 2xs per lobe.
I too am guilty of looking at peak numbers but I also do take in account for medium lift flow numbers as well.
I think the #s people need to look at closer are the medium lift numbers. The valve is in that postition 2xs per lobe.
I too am guilty of looking at peak numbers but I also do take in account for medium lift flow numbers as well.
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
Many good points made here...just one other thing for those who don't know... If you have 2 heads, both capable of flowing say, 250CFM. The head with the smaller port CC is going to have higher velocity. This is what makes AFR heads so popular. For instance, their 180CC head flows as well or better than most 200CC heads. You have the total flow, and the velocity is much higher.
