I did notice the flywheel was lighter than the CF one. By a lot
actually. The snout as you say is longer and bigger, with lots of room
for the spigot bush. But the bush from my CF engine goes in too far, so
I'll pick up a new one from one of the usual suspects.
Gene
-----Original Message-----
From: Richard Seaton [mailto:rsh17@msn.com]
Sent: Monday, November 10, 2003 5:43 PM
To: Navarrette, Vance; genehart@att.net
Cc: 6 Pack
Subject: Re: Engine Head question
Vance and others who might be interested,
The long snout flywheels ( only TR250 and 1969 TR6's, I believe))
aren't interchangeable with the short ones. One good thing about the
long cranks is that we get a 22 lbs flywheel instead of 26 or 28 lbs. Of
course you can find the after market light weight ones easier for the
short cranks. BPNW has lightened flywheels for the long cranks in
addition to the short cranks. I think they are alloy ones, but my memory
is also a little vague. Must be smelling to many exhaust fumes in the
garage as I'm not that old yet as I still now what the first thing is.
I won't tell you Vance as you might get depressed and stay in the garage
even longer.
Richard Seaton
'69 TR6, with high compression (9.5:1) was 8.5:1 originally, and a
lighter flywheel.
----- Original Message -----
From: Navarrette, Vance
Sent: Monday, November 10, 2003 3:57 PM
To: genehart@att.net
Cc: 6pack@autox.team.net
Subject: RE: Engine Head question
Gene:
One thing to consider; The earlier manifold is considerably
less efficient in terms of flow than the later manifold. You might
lose a few ponies as a result. The runners are not nearly as 'straight'
on the earlier manifolds.
As I recall the 1973 did not have an EGR, so that should not be
an issue, but I don't know when the anti-runon valve was added. You
might need to change the vacuum fitting on the earlier manifold to
accommodate the extra vacuum line needed by the anti-runon valve.
Also, the earlier heads had a higher compression ratio
than the later heads (8.5:1 vs 7.75:1, as I recall. This is from memory
and I am sure someone will correct me if I am wrong. Getting older, and
memory is very unreliable) so the mixture will certainly need tweaking.
Should be no big deal with the later carbs.
The CC motors had a different cam, and a different crankshaft.
Somebody help me out here; don't remember if the flywheel was different
on the CC motors to accommodate the crank difference. All I remember is
that the rear crankshaft snout was a different length, and that they
were not interchangeable unless some other parts were also changed.
Dang it! Wish my memory was better.
They say memory is the second thing to go when you get older. I
don't remember what the first thing to go is. =:-o
Vance
-----Original Message-----
>
>
> From: genehart@att.net
> Reply-To: genehart@att.net
> To: 6pack@autox.team.net
> Subject: Engine Head question
> Date: Mon, 10 Nov 2003 17:19:42 +0000
>
> List,
>
> I'm preparing my new rebuilt engine for installation in my 6, but I
may have
> a problem. I'm installing a CC engine from 1969, but my intake and
exhaust
> manifolds are from my original 1973 engine. Will I have to replace the
head
> on the newly rebuilt engine with a later one for it to fit? I can't
test fit
> right now, since both the manoflds are out being painted and polished.
>
> --
> Gene Hart
> genehart@att.net
|