extrude honeing
04-11-2006, 10:14 PM
#2
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I havent heard of it done on LSx heads. CNC machining seems to be the industry norm fro head porting. Usually extrude honing is saved for hard port items like manifolds etc.
04-14-2006, 01:26 PM
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i recently heard that extrude honeing also leaves a more "polished" finish unlike CNC that leaves milling marks from the cutting head.
thanxs for the reply.
thanxs for the reply.
04-14-2006, 03:32 PM
#4
With my old car (Lumina Z34 with the 3.4 DOHC V6) there was ZERO aftermarket for the motor. A lot of guys turned to extrude hone for the intake manifolds. We can't do this since ours are plastic..
However, they never sent the heads in. I think their reasoning was because when they CNC, port, polish, whatever it is they do to the heads it is directional.
Extrude honing leaves a mirror finish and doesn't direct anything any which way, its free to go however it wants.
I may be 100% wrong on this, but at least thats how I understood it to be.
However, they never sent the heads in. I think their reasoning was because when they CNC, port, polish, whatever it is they do to the heads it is directional.
Extrude honing leaves a mirror finish and doesn't direct anything any which way, its free to go however it wants.
I may be 100% wrong on this, but at least thats how I understood it to be.
04-14-2006, 05:50 PM
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i believe that GM will be extrude honeing the cylinder heads on the new supercharged Cadillac XLR-V (443 hp - 4.4L Northstar), so apparently GM thinks there is something to be gained.
from my understanding it uniformly increases the size of the passage-way that it moves through. it seems to me that it could possibly hurt the velocity of the air as it moves toward the cylinder,... but who am i to say, i'm no GM engineer.
i'm sticking with CNC
from my understanding it uniformly increases the size of the passage-way that it moves through. it seems to me that it could possibly hurt the velocity of the air as it moves toward the cylinder,... but who am i to say, i'm no GM engineer.
i'm sticking with CNC
04-14-2006, 06:16 PM
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Ive got a buddy that hand ported his SBC heads then sent then to get extruded and flowed, it turned out well but honing is just as expensive as cnc. They use a thick abrasive paste and push it through the passages under high pressure it folows the way air flows removing material, you have less control of where the material is removed from vs cnc.
