Piston to bore clearances, rover v8, 4.6, stock pistons.

[richard at home]

Shot in the dark, but anyone know the clearance limits for a rover v8 4.6?

The LR manual reckons 0.045mm, just under 2 thou. Does that sound a little tight?

Bore wear and ovalness is also very small according to the overhaul manual.

How much of that is down to getting more engines scrapped and new ones fitted?

[Boosted LS1]

Sounds good to me. Piston shape will change once heated. Piston design and materials all come into play. I'd go with what the manufactures say.

[Bluetec350]

These guys will know
https://rimmerbros.com/

[richard at home]

2 thou seems to be the norm. One of my bores measures 9 thou oversize! Too bad it's just the one bore...

[Boosted LS1]

It can be sleeved.

[richard at home]

Boosted LS1 said:

It can be sleeved.

Yep.

Full re-sleeve about £1000.
Rebore and all new pistons £500.
Flex hone and rings. £100.

What to do? If money was no object then... easy answer.

[Boosted LS1]

You can sleeve just the one cylinder, no need to do all 8 of them :-)

[richard at home]

Boosted LS1 said:

You can sleeve just the one cylinder, no need to do all 8 of them :-)

Well they are all sleeved already but you can only buy sets of 8 to hat liners... I have yet to find standard staight liners for sale individually.

[Boosted LS1]

You probably don't need to look for a top hat liner, just a straight liner. Those are common enough.