4.8L / 96MM Piston problems Rover V8

4.8L / 96MM Piston problems Rover V8

Author
Discussion

debaron

Original Poster:

866 posts

196 months

Thursday 27th April 2017
quotequote all


About to start an engine build for the Chim using 2618 alloy 4.8L forged pistons. Been looking around and there are two threads about 4.8L builds that have both gone bad using the same pistons I have. Seems it might be down to the bore clearance being too large coupled with short side skirts.

Any advice on what way best to go? Engine not linered yet so not too late to go back to 94mm cast Rover ones but means I'll prob not get to put the supercharger on....

anyone running a 4.8L that hasn't had problems??


Ta

WWAHEED

5 posts

12 months

Thursday 30th March 2023
quotequote all
Hello dear
Did you convert 4.6 L to 4.8 L ?
Regards

Boosted LS1

21,165 posts

259 months

Thursday 30th March 2023
quotequote all
What has gone wrong with previous pistons and what skirt clearance does the manufacturer stipulate? To large is usually better then to tight. For boost forged is always better. Forged pistons are robust things. They don't usually fail as such but adverse conditions can manifest on the piston to bore faces. Take bore wash or lack of lubrication as an example. Detonation can knock out piston rings and bearing shells and can leave witness marks.

Edited by Boosted LS1 on Thursday 30th March 18:16

Boosted LS1

21,165 posts

259 months

Thursday 30th March 2023
quotequote all
WWAHEED said:
Hello dear
Did you convert 4.6 L to 4.8 L ?
Regards
Not yet pet :-) He's considering it. No offence intended.