[TR] [6pack] Compression boost

[wbeech]

Would anyone mind backing up a couple of steps just to explain how to
determine the compression ratio?  I know what it is, but do you fill the
cylinder with liquid at BDC and measure how much come out at TDC?

As part of the current re-build we are milling the head just enough to true
it up, I know this will raise compression a little, but how much and how do
you measure?

Thx,

Bill B
'58 TR-3A TS/30766 L
'59 TR-3A TS/64974 LO
"A Triumph is man's best friend, it always comes when it is called...of
course, some times it is difficult to make it go"
 

-----Original Message-----
From: triumphs-bounces+wbeech=flash.net at autox.team.net
[mailto:triumphs-bounces+wbeech=flash.net at autox.team.net] On Behalf Of
emanteno at comcast.net
Sent: Monday, June 16, 2008 8:50 AM
To: Randall; triumphs at autox.team.net
Subject: Re: [TR] [6pack] Compression boost

-------------- Original message --------------
From: "Randall" <tr3driver at ca.rr.com> 

> > I plan on taking my TR engine up to 9.5:1 based on the fact that my 
> > Miata runs on regular with that compression ratio -
> 
> Well, don't be too surprised if it works out differently on your TR6. 
> There's a lot more to octane requirement besides compression ratio; 
> including combustion chamber shape and even head material (aluminum 
> heads like the Miata can take more compression).

You might also want to check to see if the Miata has a knock sensor. If it
does, it senses pinging that the ear can't hear, and then retards the timing
to eliminate the pinging. You certainly won't have one of those in your TR.
Irv Korey
74 TR6 CF22767U
Highland Park, IL
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