Forged Piston to Bore Clearance - Rover V8

[debaron]

Round to getting the Rover V8 finish honed for forged Icon pistons - 2618 Alloy

https://www.uempistons.com/index.php?main_page=ind...

- Manufacturer calls for 3.5 thou piston to bore clearance boosted - 4.5 thou NA

- Local Skyline engine builder agrees around 3.5 thou although may rattle a bit when cold

- TVR Power recommend 2 thou max

Anyone with experience of 2618 Alloy in Rover V8 know an ideal clearance or concur with one of the above?

Thanks

[stevieturbo]

debaron said:

Round to getting the Rover V8 finish honed for forged Icon pistons - 2618 Alloy

https://www.uempistons.com/index.php?main_page=ind...

- Manufacturer calls for 3.5 thou piston to bore clearance boosted - 4.5 thou NA

- Local Skyline engine builder agrees around 3.5 thou although may rattle a bit when cold

- TVR Power recommend 2 thou max

Anyone with experience of 2618 Alloy in Rover V8 know an ideal clearance or concur with one of the above?

Thanks

It makes no sense for a boosted application to run a tighter piston to wall clearance than n/a. The boosted application will always run a larger clearance.

And a little rattling when cold never did any harm....too tight on the other hand, you can take that gamble.

[227bhp]

It sounds like you've got those clearances the wrong way round, what are they and the piston diameter in understandable modern English?
Do a search for a particular thread on here about forged piston clearance, you'll learn a lot.

[Mignon]

https://www.pistonheads.com/gassing/topic.asp?t=10...