Aivars,
Biggest and easiest bang for the buck is probably fitting the SU's. I've
never done it but everyone who does raves about the improvement once they
are sorted out. You may also want to look into Goodparts triple carb setup
that is available for SU's and costs about $360 complete. Roller rockers
will help the engine breath better if a higher than stock ratio is used.
Then maybe a header and electronic ignition.
If the engine and head were properly rebuilt by the PO with low miles on it
I would not go any further. I'm not sure how much an improvement milling
the head will provide, but do not go to 9.5:1 unless you plan to install a
hotter cam, which leads into valvetrain improvements and more dollars.
Going to 8.75:1 or so, yes. But not into the higher compression.
The same is true for head porting. It is expensive and really should be
done because of a hotter cam. And port/chamber polishing is a waste of
money so avoid. Once you start getting INTO the engine the real "fun"
begins (ka-ching $$ ka-ching $$ ka-ching).
Lastly, one of my pet areas, if you take the head off check all of the
lifter faces. The faces should still be mirror smooth and shiney. Several
listers, including myself, have lost camshafts because of soft lifters that
may still be kicking around in the market. If the PO used the run of the
mill $6 lifter it might be a good idea to replace them with hardened
lifters, about $10-$12 each. Fairly cheap insurance.
http://www.141.com/triumphs/vizard.pdf extensive, and I mean extensive, TR
performance publication. A must.
http://www.goodparts.com/tech_docs/TR6_Compression_Ratio.html for
compression ratio info
Good luck!
Greg
CD6250L
----- Original Message -----
From: "Berzins Family" <berzins@eastlink.ca>
To: <6pack@autox.team.net>
Sent: Saturday, September 27, 2003 1:11 PM
Subject: Milling Tr6 Head ????
> Hi folks,
>
> I'm just looking for some input & advice on my 1974.5 Tr6 engine &
> winter "fix up plans"
>
> Here is the Storyline - Engine seems to run well & has a small amount of
> miles on it after a rebuild by PO (5 years ago) - minimal oil
> consumption - mostly due to leaks. Compression is 110 across all
> cylinders. (i'm assuming this is good as this smogged motor has a CR
> of 7.5 to 1)
>
> The Gameplan - to mill the head to increase CR to around 9.5 to 1, and
> at same time a valve job & some minimal porting. I'm also wondering if I
> should re-ring the engine at the same time? (I've heard valve jobs &
> increase in compression can sometimes seize the oil control rings)
>
> My goal is to spend a minimal amount of $$ in order to increase the
> performance. Also I plan to change over to a set of Hs6's that I have
> acquired & a set of Jim S's roller rockers that I am awaiting.
>
> Thanks in advance for all you help!!
>
> Aivars Berzins
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