milling the head on an F2?

waytooslow · 07-10-2004, 10:15 PM

I want to mill the head on my F2 to raise the compression, how much material can I remove safely?

CBR929RE · 07-10-2004, 10:27 PM

Quote:

Originally Posted by waytooslow

I want to mill the head on my F2 to raise the compression, how much material can I remove safely?

you sure that raises compression, seems to me you make the combustion chamber bigger you lose compression. am I right or no?

ND4SPD · 07-10-2004, 11:15 PM

Quote:

Originally Posted by CBR929RE

you sure that raises compression, seems to me you make the combustion chamber bigger you lose compression. am I right or no?

If you're shaving the head that means you're taking material off of the surface which butts up to the block, therefore making the combustion chamber smaller, which in turn makes for higher compression and more horsepower.

If you have a copper gasket, you could also get a thinner head gasket, or take a layer or two off your existing one(very carefully of course) to accomplish the same for much less money.

CBRBob · 07-11-2004, 8:24 AM

Back in the day when we did my F2, we shaved just enough to make the head flat (less than .010). There was still a lot of clearance so I guess a bit more would do. You could always do the clay method to see how much room you have. The bigger gain would be in mild port work and a full radius valve job.

Baketech · 07-11-2004, 8:48 AM

Not sure about the F2 chamber...but on some heads milling reduces the squish band enough to affect the rings....

CBR929RE · 07-11-2004, 10:49 AM

Quote:

Originally Posted by ND4SPD

If you're shaving the head that means you're taking material off of the surface which butts up to the block, therefore making the combustion chamber smaller, which in turn makes for higher compression and more horsepower.

If you have a copper gasket, you could also get a thinner head gasket, or take a layer or two off your existing one(very carefully of course) to accomplish the same for much less money.

so is milling basically the same as decking just done on a head rather than on the block on the surface where the 2 meet?

ND4SPD · 07-11-2004, 12:48 PM

Pretty much

CBR929RE · 07-11-2004, 5:14 PM

Quote:

Originally Posted by ND4SPD

Pretty much

ok I understand now. so it should actually be thought of as getting the compression in all the cylinders more equal to each other and that will be a greater benefit than bumping the compression a tiny bit even though both will happen when the process is done so its a win win situation. any serious engine buildup you want to make sure the mating surafaces are perfectly square so they mate perfectly.

G-Force Junkie · 07-12-2004, 12:13 AM

Biggest issue it degreeing the cams back in. Does someone make slotted cam chain sprockets?

CBRBob · 07-12-2004, 11:07 AM

Quote:

Originally Posted by G-Force Junkie

Biggest issue it degreeing the cams back in. Does someone make slotted cam chain sprockets?

A.P.E.