'A 'class and 'B' class blocks.. whats the sizes?
Discussion
I was reading last time I was away about ‘A’ class and ‘B’ class blocks but I’m buggered if I can find it now…. May have been on the V8 Forum… but does anyone know the details of this… I’m assuming it applies to TVR engines also?
It was something like the bore dia was 94.05 / 94.08 on an A class.. and 94.08 / 94.11 on a B class?
Or was I just dreaming??
It was something like the bore dia was 94.05 / 94.08 on an A class.. and 94.08 / 94.11 on a B class?
Or was I just dreaming??
John, you're not dreaming. The 'A' class blocks were the very best that came off the line. These were stronger than the 'B' class blocks, and were manufactured to much finer tolerances, resulting in a smoother, more powerful unit. All Chimaeras were fitted with the 'A' class block, whilst the Griff got the 'B' class block.
Hope this helps,
Chilli
Hope this helps,
Chilli
Chilliman said:
John, you're not dreaming. The 'A' class blocks were the very best that came off the line. These were stronger than the 'B' class blocks, and were manufactured to much finer tolerances, resulting in a smoother, more powerful unit. All Chimaeras were fitted with the 'A' class block, whilst the Griff got the 'B' class block.
Hope this helps,
Chilli
Hope this helps,
Chilli
carsy said:
I believe over time the A class blocks were seen as a bit of a failure. Yes they were meant to produce a stronger faster engine but for some reason they didnt. The evidence of this i see regularly when out in the Griff and coming across one of those Chim things.
Really why are the fastest RV8 Tivs on here Chimaera's then? .... You were saying The latter blocks (post 1997) where colour coded having been ultrasonically tested to ensure the aluminium sleeve around the liner was thick enough. Blue was the thinnest at 2.2 mm, yellow was 2.5mm and red was 2.8mm- obviously the best, and was noted by a dab of paint in the wall of the valley of the block- is this what you are thinking of?
Simon says said:
blitzracing said:
The latter blocks (post 1997) where colour coded having been ultrasonically tested to ensure the aluminium sleeve around the liner was thick enough. Blue was the thinnest at 2.2 mm, yellow was 2.5mm and red was 2.8mm- obviously the best, and was noted by a dab of paint in the wall of the valley of the block- is this what you are thinking of?
I have a 2003 X bolter big journal block with green paint and a tag that says factory LR exchange block probably liner related no doubt it was cheap at the time and everything is good inc threads etc not sure I would use it without pressure testing at least. Edited by Simon says on Saturday 20th October 21:15
TVR Beaver said:
No... I was reading it somwewhere where the liner ID had a manufacturing tolerance... and once fitted they were graded by the size of the bore?...
Was talking to Rob today.. but he's not heard of it either?.... Will have to go back in my history.. see if I can find it again ..
I do remember this being a general engine thing, specifically if re-boring the engine-worth a post on the engine forum methinks.Was talking to Rob today.. but he's not heard of it either?.... Will have to go back in my history.. see if I can find it again ..
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