Intake manifolds
12-15-2002, 11:15 PM
#2
Done With Sidepatch
Rennlist Member
Rennlist Member
Try <a href="http://www.extrudehone.com/automotiveaftr.html" target="_blank">Extrude Hone </a>...They show a price of $585 for a Porsche 924/944 Intake...
Couldn't afford it myself but they're some on the list that feel it's an effective modification.
Couldn't afford it myself but they're some on the list that feel it's an effective modification.
12-15-2002, 11:59 PM
#3
Race Director
I would like to see flow-numbers for individual runners before & after the extrude-hone process. The runners themselves are mis-matched in stock trim and there would be a great benefit to balancing them in addition to increasing the overall flow. In fact, if the extrude-hone were to exaggerate the flow-differences, I would think that upgrade can actually be detrimental to performance (more risk of blowing up that one lean cylinder).
12-16-2002, 11:31 AM
#4
Rennlist Member
Do I hear an Amen?
12-16-2002, 08:09 PM
#5
Rennlist Junkie Forever
I've done the extrude intake manifold. Save your money.
Dyno results before and after on my old car (K27/6 with Powerhaus head) showed less than a 5HP increase.
The results with Extrude Hone vary from job to job. Further... the Extrude Hone process is a poor substitute for real port work (although cheaper).
Dyno results before and after on my old car (K27/6 with Powerhaus head) showed less than a 5HP increase.
The results with Extrude Hone vary from job to job. Further... the Extrude Hone process is a poor substitute for real port work (although cheaper).
12-17-2002, 02:13 AM
#7
Rennlist Junkie Forever
The SFR manifold, or any other custom intake manifold, does something very different than Extrude Honing a stock manifold.
The stock manifold has long runners, which are tuned to make peak engine TQ at a certain rpm (low end/midrange). The short runner intake manifolds (like the Huntley, SFR, Lindsey, & Milledge) are tuned to make their TQ peaks someplace else (much higher in the rpm range.
These custom intakes are only of a real benefit if you change all of the intake/exhaust/cam/head/turbo components to aftermarket components that are ALSO designed to make their TQ peak higher up the rpm range as well.
The stock manifold has long runners, which are tuned to make peak engine TQ at a certain rpm (low end/midrange). The short runner intake manifolds (like the Huntley, SFR, Lindsey, & Milledge) are tuned to make their TQ peaks someplace else (much higher in the rpm range.
These custom intakes are only of a real benefit if you change all of the intake/exhaust/cam/head/turbo components to aftermarket components that are ALSO designed to make their TQ peak higher up the rpm range as well.