milling VVT piston domes to reduce compression
Like this poster from another forum says:
Chevelle Tech - View Single Post - 10.25:1 pistons for 71' 402 Another option is if your TRW`s are in good shape, have a machine shop mill the dome down to give you the copmression ratio you want. Most hi-po machine shops should be able to do this and would be able to figure out how much to take off. Y8s, can you measure the thickness of the crown of the 99 pistons you have? |
I measured the material thickness in the center of the crown of the 01 pistons .... ~ 4mm, yowza!
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How thick did you expect it to be? Thats the better question.
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Hoping against hope that Mazda raised the c/r by thickening the crown.
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I was able to do this with good success on a vw 2.0 16v motor, but there may have been more meat to the piston tops. Droppedt from 10.8:1 to ~9.3:1 cr
Definately a cost effective option if you already have the pistons and there is enough meat in the piston to do this. |
Originally Posted by vw_nut
(Post 507025)
I was able to do this with good success on a vw 2.0 16v motor, but there may have been more meat to the piston tops. Droppedt from 10.8:1 to ~9.3:1 cr
Definately a cost effective option if you already have the pistons and there is enough meat in the piston to do this. Has anyone checked to see if you can by a head shim for the mazda head. I know for my mopar 440 you can buy varying thicknesses of head gasket for this purpose. |
Originally Posted by djp0623
(Post 507040)
Has anyone checked to see if you can by a head shim for the mazda head. I know for my mopar 440 you can buy varying thicknesses of head gasket for this purpose.
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