Edward,
According to the Specs, the compression ratio on North American 1500
engines is 7.5:1. But if the engine has been rebuilt, it may be as high
as 9:1 (European Engines), or perhaps even higher if head work was
done. The dished pistons represent the lower compression and the flat
top ones are European (or Upgraded US)
In short, What you stated about the TR6 also applies to the Spit 1500.
BTW, I need you to log into the International Triumph Spitfire Database
and submit the information on your cars. the Web address is:
http://Home1.gte.net/spitlist/index.html
Regards,
Joe Curry
edward dressler wrote:
>
> I have recently bought 3 Spitfire 1500 s, one is a '73 and two are '80 s.
> They sure are cheap these days! I have been trying to determine what the
> compression on these 1500s is, but I seem to be getting conflicting
> information from all of my resources. Is there a way to tell from the
> numbers on the heads what the compression is or was the compression changed
> by the shape of the tops of the pistons, such as the flat top pistons used
> in a TR-6 giving the 9.0:1 as apposed to the 7.5:1 using the 'dished'
> pistons. Is there good source for this info?
>
> Ed Dressler
> Delaware Valley Triumphs
> '72 TR-6
> '62 TR-4
> '61 TR-3A
> '68 MGC
> Multi Spits
--
"Thanks to the Interstate Highway System, it is now possible
to travel across the country coast to coast without seeing
anything." -- Charles Kuralt
|