My only concern is that all these cars are old enough to have been
tampered with without the current owners knowledge. If you mill a head
too far it is ruined. I'm not attacking you, Dick. Just trying to be
helpful. You give lots of fine advice. I think we are 2 of a kind,
except I'm too busy working on stuffing a 2.3 Ford turbo into a TR250
( along with 8.8 rear and T5 trans) to be helpful to the other members.
Get your dander down. :^)
Best regards, Jim
----- Original Message -----
From: "Sally or Dick Taylor" <tr6taylor@webtv.net>
To: "James Franks" <jimmble@adelphia.net>
Cc: "Six pack" <6pack@autox.team.net>
Sent: Tuesday, July 17, 2001 3:18 PM
Subject: Re: Compression ratio.
> James---I just knew if I tried to shorten my sometimes lengthy
replies,
> the one on "compression ratios" would bring up the 'what ifs'. You
are
> right, of course, that it's not as simple to get a 9.5: 1 by taking
off
> a fixed amount. What's needed also is knowing the original head
> thickness before milling begins. Since the one requesting the
> information told me it was an unaltered head from a '73 then it is
> indeed possible to use a formula to figure how much to cut. In this
> case, .110.
>
> One one is going for the highest possible compression ratio I would
> agree that c.c.-ing the head volume and decking the block is
necessary.
> I don't beieve this is needed for the relatively mild 9.5 so I didn't
> include these extra steps.
>
> I DO like to be challenged on what I write, as the purpose of the list
> it to assimilate information about the TR250/6. I hope the above
cleans
> things up a bit.
>
> As it turns out, the head in question was later discovered to be one
> from perhaps a '75 or '76 TR that has the lowest of compression
ratios.
> A revision on how much to cut is now in order.
>
> The Comp. Prep. Manual for the TR6 is an excellant source for
> performance improvements. My information on headwork comes from here,
as
> well as the AUTO MATH HANDBOOK from HPBooks.
>
> Dick Taylor
> Los Angeles
|