Piston ring thicknesses - 3.9/4.2l

mk1storm · Post by **mk1storm** » Fri Feb 01, 2008 7:27 am

Can anyone tell me what the thicknesses are of the standard piston rings used in the 3.9/4.2l engines? ie 94.04mm bore???

Looking to use these with my omega 93.5mm pistons and adjust the gap accordingly but need to be sure the ring thicknesses are correct before i get them. My current ones are 2.0, 2.0, 4.0mm.

ian.stewart · Post by **ian.stewart** » Fri Feb 01, 2008 11:12 am

Another dimension to check would be the width of the ring, Not the thickness, I have seen bores and pistons ruined by fitting rings that are too wide to fit the piston ring groove root dia, and do not give enough clearance when the engine warms up.

ian.stewart · Post by **ian.stewart** » Fri Feb 01, 2008 11:54 am

Ive just had a call from Thurstons about Omega Rings, or should I say Rings to fit Omegas, Approx £250+VAT

HairbearTE · Post by **HairbearTE** » Fri Feb 01, 2008 8:44 pm

That's a bit of a stripe Ian! Might as well get from the states. It's a joke how much some of our gear costs compared to chevy

Post by **Rossco** » Sat Feb 02, 2008 9:57 am

HairbearTE wrote:That's a bit of a stripe Ian! Might as well get from the states. It's a joke how much some of our gear costs compared to chevy

You could always go BBB........and get a 455