lowering compression ratio?

[WabTheKing]

looking at cost friendly ways to lower the compression ratio of my v8 from 10:80:1 to 9:1, not keen on a thicker head gasket, or buying custom pistons, has anyone skimmed a piston i a lathe to lower the CR?

cheers
will

[WabTheKing]

rs6 is the same bore and stroke but has a 9:30:1 CR, could rs6 pistons be the answer?

[GazzaG60]

i had my pistons skimmed.

didn't go intro compression details. i went

"take bout a mil off there will you mate cheers"

i love rack-o-eye

[Rusty]

RS6 could have shorter rods or indeed different pistons. Not a difficult calculation to get close to. What's the bore and stroke on a V8?

[WabTheKing]

mine is 84.5 bore x 93.00 stroke, same as an rs6 is my research is right

[WabTheKing]

i had my pistons skimmed.

didn't go intro compression details. i went

"take bout a mil off there will you mate cheers"

i love rack-o-eye

^^ this is plan "B"

[Rusty]

-1.72mm per piston to go from 10.8 to 9

bore 84.5 mm
stroke 93 mm

Cyl XSA 5607.94 mm^2
Cyl cap 521538.4 mm^3

Eng cap 4172307 mm^3

10.8 CV 48290.6 mm^3
10.8 H 8.61111 mm

9 CV 57948.7 mm^3
9 H 10.3333 mm

Diff H 1.7222 mm

CV = compressed volume

[WabTheKing]

ooooo i love a good bit of number crunching!!!!!!

1.72 is a fair amount, shall have to inspect a piston to see if they will stand that much being taken off, dosent sound much of an increase on the gasket tho............ im being lazy now lol

[Rusty]

Could do both TBH.

How much did Tom skim his pistons?

[WabTheKing]

Would have to make both top pulley's adjustable to comensate for the increased distance from the bottom pulley, I know most will say its not critical but getting the cam timming 'bob on' makes a noticable differance

[Rusty]

And if you're going turbo/SC then you'll want to adjhust them a little anyway.

[WabTheKing]

TD04's are what I've been looking at after having a chat with a few turbo guru's