John,
I tried the same thing... moving the radiator forward... but was
stopped by the air input shroud. Another lister has said that it
will fit if you turn it around am mount it backwards. Another
suggested that you need the shorter extension from a TR3.
I am still in data gathering mode... but will figure it out
someday.
Brian Sanborn
62 TR4 CT16260L - Groton, MA
My TR4 Restoration Web Site
http://www.net1plus.com/users/sanborn/Home.html
E-Mail: sanborn@net1plus.com
-----Original Message-----
From: John Howard [mailto:trjhhow7@home.com]
Sent: Friday, August 25, 2000 8:42 AM
To: Brian Sanborn
Subject: Re: Making a TR 4 Rev Up
Brian - You're way ahead of me on your TR4, but your comments on
the fan
caught my eye. I have installed the yellow 250 fan. It did
require
drilling out the radiator bracket holes to move the radiator
forward an
inch or so, but the fan now fits well. of course, I've done no
serious
driving yet as the clutch is still not operating correctly and
the
dieseling bothers me, but in terms of clearance at least the fan
is fine.
Cheers John Howard
Brian Sanborn wrote:
>
> Jeff,
>
> I rebuilt my TR4 engine to original spec except for 87MM
pistons
> and liners, Teflon valve guides, hardened seats and modern rear
> seal. I used the stock TR4A cam fro BPNW. The engine came out
> great.... strong and smooth.
>
> I did experience a pronounced roughness above 3500 RPMs and
> thought that the moving parts in the engine were off balance.
I
> also had the huge, heavy 4-blade TR fan. It had a knick in one
> blade was not balanced by anyone.
>
> I bought one of those "tropical" 6-blade fans on Ebay and
> balanced it with bicycle wheel type balancer with new balance
> weights from TRF. This was a pure speculation move... before
> moving to no fan and an electric replacement. Well... It fixed
> the problem completely.
>
> The engine revs over 5000 without any vibration. I still think
I
> could improve the situation with one of those TR250 yellow
> plastic fans... if I could get it to fit without hitting the
> radiator.
>
> Brian Sanborn
> 62 TR4 CT16260L - Groton, MA
>
> My TR4 Restoration Web Site
> http://www.net1plus.com/users/sanborn/Home.html
> E-Mail: sanborn@net1plus.com
>
> -----Original Message-----
> From: owner-triumphs@autox.team.net
> [mailto:owner-triumphs@autox.team.net]On Behalf Of Jeffrey J.
> Barteet
> Sent: Monday, August 21, 2000 12:36 PM
> To: triumphs@autox.team.net
> Subject: Making a TR 4 Rev Up
>
> Hi, Folks,
>
> So my new engine has accumulated around 1500 miles on it and
I'm
> exploring
> the upper RPM limits a bit in second and third gear.
>
> The crank, rods, pistons, pressure plate and flywheel were all
> balanced. New AE 87mm pistons were used. The crank was turned
> down .010",
> and I had the cam reground by ISKY, and I have the TR 555 grind
> which was
> supposed to be a 'fast road' cam. It has 268 degrees of
> duration. The
> flywheel was lightened by a few pounds, but it still weighs a
> country ton
> with the old-style ( many little coil springs ) pressure plate.
>
> It runs quite well and pulls like mad from 1800-4200 rpm. I
have
> an OD, so
> I'm guessing I have the 4.10 rear end.
>
> In my 20/20 hindsight, I would have done a couple of things
> different, and
> I probably will when it starts raining some time in December.
> They are:
>
> 1) Shave the head to get the compression higher
> 2) Ditch the '4' flywheel and gone with a 4a flywheel or
perhaps
> even an
> aluminum one with a 'modern' diaphragm-type pressure plate
>
> So briefly, that's the drivetrain.
>
> What I'm noticing is that the engine is quite smooth until you
> get up to
> around 4800-5000 RPM when a vibration sets in. I haven't tried
> going past
> 5000. It feels unhealthy.
>
> In that article recently posted
>
> http://www.speakeasy.org/~mgendron/Kastner_TR4A.html ) by
someone
> on the
> list about Kastner doing salt flats racing and drag racing, he
> was pulling
> six grand on his motors.
>
> .....and Terry Ann Wakeman, who is also on the list, has a
> hot-rod TR3
>
> see her nice web site at:
> http://www.cruzers.com/~twakeman/TR/index.html )
> and I believe she has a harmonic balancing pulley on her car.
I
> seem to
> recall her saying once that she shifts at 5700 on on-ramps.
>
> I'm jealous.
>
> So here are my fears, questions:
>
> When I had the motor balanced, the machine shop guy got a
little
> beady-eyed
> when I asked him if he had balanced the crank with the front
fan
> extension
> on the crank. I'm wondering now if that's the problem? It's a
> fair-sized
> chunk of cast iron.
>
> Or
>
> Do these motors really need a balancing pulley to rev? Did
> Kastner have these?
>
> Or
>
> It it just impossible to make them rev with a 35-40lb flywheel
\
> pressure
> plate combo?
>
> What steps should I take to make 'er rev?
>
> Once again, I'd appreciate any first-hand experience from the
> racers out
> there.
>
> -jeffrey
>
> Jeffrey J. Barteet, System Administrator
> National Center for Ecological Analysis and Synthesis
> 735 State St., Santa Barbara, CA
> barteet@nceas.ucsb.edu 805.892.2508
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