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Re: Extrude Hone Posted by Shaun [Email] ![]() ![]() In Reply to: Extrude Hone, marq, Fri, 5 Jan 2001 14:20:58 Members do not see ads below this line. - Help Keep This Site Online - Signup |
In my quest for a hi-po engine, which has included a complete rebuild, balance-blueprint, etc., etc., I had the intake manifold extrude honed. The intake runners are almost like glass...there is absolutely nothing in the runners protruding in the intake runners. The head and manifolds were then port matched. Increasing size only decreases air flow, I believe. The idea is to keep the runner length the same size, but in increase air velocity. For instance, I had a custom exhaust manifold made from weld els...I had it bench flowed and it flowed only 4 cfm more than stock per tube.....the guy who did the bench flow used to be a Saab mech., but now builds hi-po V-8s for NASCAR, dirt track, etc., type racers. He told me that the custom manifold runners were too big and that they should have been closer to the stock size....which would have increased exhaust gas velocity into the turbo.
In addition, almost every import racer, not to mention Ford SVT Countour, uses this process. I remember seeing the Countour layout in one of the mags and how it increased airflow.
Not cheap, about $400.00 for my manifold, but I think worth considering all the other stuff I've done and currently doing.
Shaun
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