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shaving a head?????????

Guest Anonymous

By Guest Anonymous,
in BMW 2002 and other '02

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Guest Anonymous

Guest Anonymous

Posted
Posted

is it a good idea to shave a head? its a E12. I am taking my head in tomorrow for a valve job and just thought about this. I have a 292 cam. how much would i want to shave? just for street performance. thanks!

mike

72 Golf

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Guest Anonymous

Guest Anonymous

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you can shave it and pickup about .5 CR but you will also retard the cam timming.. you'd need an adjustable cam gear to get your timming back to stock.. you could prob pickup your HP you desire by getting an adjustable cam gear.. yankin the thing forward 4 degree and running about 35 degrees of total advance in timming.. alot of people set their ignition timming way to conservative... most just don't know what it is.. party on

Kris

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Guest Anonymous

Guest Anonymous

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I replaced the cyl head on my car recently and I suspect that the one I installed has been shaved to eliminate some warping. After installation, my car is pinging like crazy, which it rarely did before, even though it has the domed pistons.

Could this be my problem and, would the adjustable cam gear work for me too?

TIA,

Harry

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Guest Anonymous

Guest Anonymous

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It's not because of the head or the cam timing.. it's probably due to your total advance set up in your ignition timing... if your cam timing was retarded you would get less air fuel mixture in the cylinder producing less HP.. the more likely problem is that you have to much advance dialed into the car.. like a car ecu with a knock sensor.. it would back the timming out untill it doesn't knock any more.. if you are timing your car with a timing light without an adjustable advance knob.. then you should get one.. they're much more accurate and easier to use.. best thing to do is back it off the timming about 3 degrees and see what happens.. if still ping then do 3 more.. repeat.. or if you don't want to go straight to fooling with timming then fill up on premium and toss in a bottle of like "octane booster". if that eliminates the pinging then your definitly to advanced.. party on

Kris

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Guest Anonymous

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If you get the head shaved make sure that you get the front upper timing chain cover shaved at the same time. If you don't you won't be able to stop the tappet cover leaking, short of fitting a stepped gasket.

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