Bill,
I assume that by "there's a lot longer between shifts" you mean that
acceleration is slower? If so, it could just be that the engine needs
a freshening. You say you did the engine in '73...how many miles have
you put on it since then? Timing chains don't stretch much on TR6s as
far as I know (not like the infamous Stag timing chains), but I think
tensioners go. My timing chain makes some noise now, when the engine
is between 2000 and 2500 rpm, and this is probably because of a bad
tensioner. One day I'll work up the strength to replace it. One
lister offered a neat way to check if you've got too much slop in the
chain/tensioner. Just turn the crank backwards by hand with your other
hand on the distributor rotor. I think he said that more than 4
degrees crank rotation before the rotor turns indicates too much free
play, which is probably due to a bad tensioner. Another possibility
could be that your cam lobes are a bit worn from the increased spring
pressure of comp. valve springs and the increased lift. I've heard of
some people rounding off the lobes over time. Also, if you didn't
line-bore your block and press fit some cam bearings, perhaps your cam
has worn into the block.
The two piece bushings made of polyurethane or nylatron are definitely
much easier to install than one piece rubber or hard rubber bushings.
I installed two piece nylatron bushings in my front suspension, and
they were a breeze to install. One day I'll do the rear. Just
remember to put some grease on the bushings prior to installation so
they don't start squeaking!
Tim Holbrook
1971 TR6
--- Bill McIntire <william.mcintire@wright.edu> wrote:
> 6 Packers
> Have a '70 6 with 70k miles on it. Along about '73 I pulled
> the head and followed the comp. manual re: combustion
> chambers, valve pockets, intake valve shape, and ports -
> also put an S-2 cam in. The problem now is that the car is
> getting lazy. It still runs fine but there's a lot longer
> time between shifts. Do TR's have a habit of stretching
> timing chains?? There are no strange noises to indicate a
> broken tensioner or extremely loose chain and the motor
> seems fine otherwise.
>
> Question 2 - The rear end seems to want to help me steer,
> while I appreciate its effort it's not a real asset.
> Received a new goodie catalog the other day and it seems
> (from the pic.) they have poly rear bushings that are in two
> pieces w/steel tube through the center. It appears the
> hassle factor may be less by beating a bushing half way
> through twice than to fight one all the way through. Does
> anyone have any input?
> TIA Bill
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