Hi Sam
There are two sizes of crank shaft for the 2 litre engine, the change came
about at around the same time as the 2500 engine was developed so that both
engines were more common. the 2500 even uses the same con rods with less
height from the gudgeon (wrist?) pin to the piston crown. So only the crank
and pistons determine the capacity!
Graham.
----- Original Message -----
From: "Sam Gentry"
Subject: GT6 crank confusion
> OK... I am confused... I am checking the crankshaft from my 73 GT6 and the
> dimensions that I get are not even close to the numbers in my Bentley.
The
> rod journals are right on, but the main bearings are way off. The book
> says 2.001 to 2.0005, but I measure 2.312!!! I have used two micrometers
> and a dial caliper and get the same answer. I have an old crankshaft that
> measures more or less the same (it is fairly worn). Does anyone know the
> correct crank main bearing specs? I don't see how I could be off by
0.311!!
>
> While I am at it... What is the correct bore diameter? The book says
> 2.9405 to 2.9416 in three grades, but pistons no longer seem to be
> available in grades. The book says that the bore can be as much as 0.010
> over, but over what? What is the nominal dimension? Of course,
> 2.9405-2.9416 is only 0.0011 so I guess it does not matter much which
> dimension I use. The middle is 2.941 and that is a number I have seen.
My
> bore is about 2.945-2.947 which is within 0.010 of 2.941. It is even
> within 0.010 of the smallest diameter specified.
>
> More while I am at it... If the bore is less than 0.010 oversize does that
> mean that I can use standard rings?
>
> Thanks, Sam
>
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.422 / Virus Database: 237 - Release Date: 21/11/02
/// triumphs@autox.team.net mailing list
/// or try http://www.team.net/cgi-bin/majorcool
/// Archives at http://www.team.net/archive
|