|
TVR Beaver
Original Poster
2,140 posts
50 months
|
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?? 
|
|
|
Chilliman
3,560 posts
31 months
|
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
|
|
|
pigpen
222 posts
120 months
|
Chilliman said: All Chimaeras were fitted with the 'A' class block, whilst the Griff got the 'B' class block. 
|
|
|
dhf
1,103 posts
64 months
|
|
|
Simon says
9,403 posts
91 months
|
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 
|
Advertisement
|
|
|
TVR Beaver
Original Poster
2,140 posts
50 months
|
 Absolutely no problem with that at all…. Let’s face it; you need some good bits in something that looks like that!
|
|
|
carsy
1,341 posts
35 months
|
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.
|
|
|
Simon says
9,403 posts
91 months
|
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 
|
|
|
carsy
1,341 posts
35 months
|
Obviously never driven a Griff then Simon. I will have to let you take mine out some time. Honestly they are a lot faster, you wont believe it.
|
|
|
blitzracing
3,325 posts
90 months
|
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?
|
|
|
TVR Beaver
Original Poster
2,140 posts
50 months
|
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 ..
|
|
|
Simon says
9,403 posts
91 months
|
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.  Ignore the lousy valley finish/casting/flash that's all been relieved now 
|
|
|
blitzracing
3,325 posts
90 months
|
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.
|
|
|
dhf
1,103 posts
64 months
|
I was in Power way back in Wedge time i think, and they were stripping complete engines which were rejects from LR,there were shelves of them,the guys i spoke to said take this one i'm stripping,came through without any pistons fitted....
|
|
