RE: Compression Ratios
Howard just sent this clarification to me. Sorry for my confusion: --- The 76 Spit did/does have 9.1:1 compression from the factory, as I have one too. The owners manual states that we are to use 93/94 octane due to high compression. The following year, 77 unleaded fuel was mandatory on Spits and the engines were adjusted back down on compression and cat converter was added for the new emissions standards. To quote "The Triumph Spitfire" book by Michael Cook, page 57: "1976: Through some technical alchemy, Triumph engineers were able to raise Spitfire compression back to 9 to 1 for non-California cars. This resulted in some performance benefits and in really good gas mileage - up to 37 mpg on the highway. The catalyst-equipped California cars continued with 7.5 to 1 compression and 33mpg. .." Howard *** http://www.team.net/the-local*** Your messages not reaching the list? Check out http://www.team.net/posting.html *** unsubscribe/change address requests to [EMAIL PROTECTED] or try *** http://www.team.net/cgi-bin/majorcool *** http://www.team.net/mailman/listinfo *** Archives at http://www.team.net/archive *** Edit your replies!
RE: Compression Ratios
I don't think the '76 US market 1500 had a 9:1 compression. It did use a flat top piston which is where the confusion lies, but the cylinder head was higher to lower the compression. Compression had to be lowered to meet US emissions. Can someone from the old country confirm this? Gene Eighmy > Flat top pistons and emissions are the answers I believe. I have a 76 > myself. > > On Wed, 26 May 2004 14:11 , [EMAIL PROTECTED] sent: > > >Does anyone know why the '76 Spitfire 1500 (fed.) had a comp. ratio of > 9.00:1 > and all of the others from '73-80 were 7.50:1? How'd they accomplish that > and > why go back? *** http://www.team.net/the-local*** Your messages not reaching the list? Check out http://www.team.net/posting.html *** unsubscribe/change address requests to [EMAIL PROTECTED] or try *** http://www.team.net/cgi-bin/majorcool *** http://www.team.net/mailman/listinfo *** Archives at http://www.team.net/archive *** Edit your replies!
Re: Compression Ratios
Flat top pistons and emissions are the answers I believe. I have a 76 myself. On Wed, 26 May 2004 14:11 , [EMAIL PROTECTED] sent: >Does anyone know why the '76 Spitfire 1500 (fed.) had a comp. ratio of 9.00:1 and all of the others from '73-80 were 7.50:1? How'd they accomplish that and why go back? > > >Your messages not reaching the list? >Check out http://www.team.net/posting.html *** http://www.team.net/the-local*** Your messages not reaching the list? Check out http://www.team.net/posting.html *** unsubscribe/change address requests to [EMAIL PROTECTED] or try *** http://www.team.net/cgi-bin/majorcool *** http://www.team.net/mailman/listinfo *** Archives at http://www.team.net/archive *** Edit your replies!
