----- Original Message -----
Sent: Monday, December 02, 2002 7:28
PM
Subject: RE: Compression ratio
testing
Regulations used to vary a bit in class racing and I haven't a clue
what they are in 2002 - in my day you were allowed stock bore +40' (1mm)
regardless if this took the capacity over the limit. A good example was when
Bathurst was a capacity class race, I can't think of any Nissan example in
that era but the infamous Celica GT 2000 18RGU engine was 1960cc in stock form
but plus 1mm took it just over to 2004cc and that's what the Williamson
Celicas raced with - it is a very over square engine (only 80mm stroke) so
+1mm bore was +11cc per cylinder.
3.5"
(88.9mm) bore L20B engines were very common rally engines so they can be
reliable if built right i.e. sonic tested and bored round and not bored square
or oval and half decent quality pistons used. The Japanese block was the best
from what I've seen out there. Go for it and see what happens, you'll never
know unless you give it a go and in reality there's not much you can do about
it once it's bored that far anyway.
regards
Terry
When I bought the motor, I asked the guy twice
whether its capacity was over two litres and he said yes both
times.
Basically I wanted to legitimately compete in
under 2 litre class competitions.
Maybe the guy lied or just did'nt know,as he
did'nt build the motor either. Neither did the guy he bought it
off.
Do reckon it's "scarey" because wall thickness
is a bit thin on a 89mm bored block?
Regards,
Rob P
----- Original Message -----
Sent: Monday, December 02, 2002 6:39
PM
Subject: RE: Compression ratio
testing
Still not quite right Errol - the second 60 should be 45 also, the
result is correct.
2140cc L20B block is 89cc bore - scary.
regards
Terry
Apologies, I'll read the post better next
time.
At 45 cc that means ((12.84 x 45) - [Terry Rudd] 45 (60 )=532.8 cc
which would make it a 2140 engine. A much more likely
figure.
Cheers Errol,
You may be right, as Terry has also cast
doubts over the validity of the figures.
However, where did you get the 60 in your
formula? I cc'd the combustion chamber with the head on the block and
this included the chamber volume and the remainder of swept volume
(0 cc) and total was 45cc at TDC.
The flat tops must be flush with the top of
the block, basically.
Regards,
Rob P
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