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Ea81 and Ea82 head porting.
Posted 14 December 2005 - 09:15 AM
Posted 14 December 2005 - 12:03 PM
I guess I can't really help, since I have no experience in the matter. But... I would grind it down.
Hmmm... someone with a flow bench and spare parts (and spare time) should test out the best porting method for our heads.
Posted 14 December 2005 - 12:08 PM
Are you talking about the cast line in the intake area that runs with the flow?
Yes that is the one that I am refering to.I guess I should be a little more specific.
Posted 14 December 2005 - 03:32 PM
Just remember - when it comes to porting, bigger is definitely not always better!
Posted 14 December 2005 - 06:53 PM
Unless you are turning insane RPMs, I would remove only small amounts of material in areas that protrude into the direct flow. I grinded down the areas under the intake mounting holes. I took a course sanding wheel to just knock off the casting flash and give a smooth transition. I also matched the intake and gaskets also. The key factor to remember is that VELOCITY makes power. That mixture needs to blast into the chamber with some serious motion. Too large of port will only slow this down. Your cam needs to match your ports, you will throw away power if they don't match. I'm running stage 3 cams and I'm still on the conservative side with my porting. Seen too many people open ports up wide only to find out that their engine doesn't do crap until the RPM comes up; by then the race is already over.
Usually. people do more harm than good when porting heads. A good 3 angle valve job can give you excellent results with a stock port.
Rule of thumb- remove material only in the narrow areas, and only remove a small ammount if you have no flow measuring equipment.
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