intake port CC ?

rod · 09-03-2017, 12:32 PM

what is the relationship between intake runner CC and engine cubic inch?
I assume that projected rpm, cam and compression are also involved.
thanks Rod in AZ

SSDiv6 · 09-03-2017, 03:10 PM

Quote:

Originally Posted by rod

what is the relationship between intake runner CC and engine cubic inch?
I assume that projected rpm, cam and compression are also involved.
thanks Rod in AZ

Although a broad question, yes, intake runner size has an influence on the projected performance of the engine.

Ed Wright · 09-03-2017, 10:29 PM

This is the Stock & Super Stock section. We have no choice but to use the NHRA spec for our particular engine.

Adger Smith · 09-03-2017, 10:52 PM

Pick the head that has the largest cross sectional (CSA) area for the cubic inch you are running.. CC's can trick you because a long narrow port can have a small CSA and another port with the same CC can be short with a bigger CSA. The long narrow port will usually have high velocity that makes low end TQ & limits RPM, esp if they are small for the Cu in of the engine.

09-03-2017, 12:32 PM	#1
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 308 Likes: 0 Liked 17 Times in 13 Posts	intake port CC ? what is the relationship between intake runner CC and engine cubic inch? I assume that projected rpm, cam and compression are also involved. thanks Rod in AZ

09-03-2017, 10:29 PM	#3
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Re: intake port CC ? This is the Stock & Super Stock section. We have no choice but to use the NHRA spec for our particular engine. __________________ Ed Wright 4156 SS/JA

09-03-2017, 10:52 PM	#4
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,365 Likes: 462 Liked 694 Times in 270 Posts	Re: intake port CC ? Pick the head that has the largest cross sectional (CSA) area for the cubic inch you are running.. CC's can trick you because a long narrow port can have a small CSA and another port with the same CC can be short with a bigger CSA. The long narrow port will usually have high velocity that makes low end TQ & limits RPM, esp if they are small for the Cu in of the engine. __________________ Adger Smith (Former SS)