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Engine Specific Info and Questions => IDI Engine => Topic started by: rabbitman on June 07, 2008, 11:27:47 am

Title: How do I port my head?
Post by: rabbitman on June 07, 2008, 11:27:47 am

Ok, I'm gonna have the manifolds off in the near future and figured I should port the head.

First off is porting easy to do without wrecking the head?

Do you just smoothen the opening of the ports and widen 'em a bit?

How deep into the head do you port?

Do you port the manifolds too?

Thanks :)

Title: How do I port my head?
Post by: riddleyo on June 07, 2008, 12:34:09 pm

Porting is pretty easy if you have patience. It is slow work. I used a marker to color around the ports, then I used a gasket and a needle to trace an outline of the size I want the ports to be. This is called gasket matching. I used a die grinder hooked up to an air compressor with an aluminum cutting bit to cut the outline out. Then I used a dremel with a sanding roll to smooth it out a bit. I didn't polish it or anything. I ported about 2 inches into the port. I also did the same thing to the manifolds (gasket matching).

Title: How do I port my head?
Post by: mufflerbearing on June 08, 2008, 10:23:30 pm

you also need to remove and disassemble the head before you port it, then clean it out thoroughly or have it hot tanked and re-assemble.

-j

Title: How do I port my head?
Post by: rabbitman on June 09, 2008, 06:30:41 pm

Quote

you also need to remove and disassemble the head before you port it, then clean it out thoroughly or have it hot tanked and re-assemble.

-j

Oh, maybe I'll save that for when I need to pull the head. Thanks

Title: How do I port my head?
Post by: fastvicar on June 10, 2008, 04:43:18 am

Porting with the head on is not wise.  Bits of metal & abrasives falling down into the cylinder is never a good thing.

Besides port matching, isn't there more to do on these heads?  Doesn't the exhaust port respond well to opening up the inner radius?

Title: How do I port my head?
Post by: shegel on June 10, 2008, 09:59:24 am

i remember a story about a guy with a 1.8t a4 that did a home made port polish on his car. (got the idea from a honda friend)...long story short he removed the air filter and poared sand down his air box. complained later about having to rev the *** out of it to keep it running

Title: How do I port my head?
Post by: mufflerbearing on June 10, 2008, 10:03:06 am

Quote from: "shegel"

i remember a story about a guy with a 1.8t a4 that did a home made port polish on his car. (got the idea from a honda friend)...long story short he removed the air filter and poared sand down his air box. complained later about having to rev the *** out of it to keep it running

that story is so old...

-j