Sam, Your summary seems to profile the difference in early Spitfire 4 cylinder engines and the later (Large Journal) ones. I don't know much about the GT6 engines, but it would appear that the later ones follow the same sizing as the Spits. I suspect you have a later GT6 engine, correct?
Joe Sam Gentry wrote: > > 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 /// [EMAIL PROTECTED] mailing list /// Send admin requests to [EMAIL PROTECTED] /// or try http://www.team.net/cgi-bin/majorcool /// Archives at http://www.team.net/archive /// Send list postings to [EMAIL PROTECTED] /// Edit your replies! If they include this trailer, they will NOT be sent.
