[Fot] TR4 Valve Guide Clearance

[Alexandre Camoletti]

Dears, I installed the Moss alu bronze guides and had to fight against my
machinist who did not want to ream them (after fitting of course) to .004.
I ran 6'000 miles so far with that engine, last outing was for 3 days racing
end of May, driving the car to and back from the event (500 miles away on
motorways maintaining 90mph cruise speed with OD), total 1300 miles and it
used less than 1 quart of oil.
So it works very well as Tony mentions, bronze expands when hot and the stem
as well, making for a tight clearance from the .004' cold.
But make sure they are reamed to size after fitting.
Cheers!
Alex Camoletti

-----Message d'origine-----
De : Fot [mailto:fot-bounces at autox.team.net] De la part de Tony Drews
Envoyi : samedi 28 juin 2014 22:50
@ : Marcel Van Mulders; 'EDWARD BARNARD'
Cc : fot at autox.team.net
Objet : Re: [Fot] TR4 Valve Guide Clearance

There is a tool used to measure the ID of the bore, and they should be
reamed to size after installation.  Stickimg valves is a bigger problem if
you have enough lift in the cam that a stuck valve will hit the piston.
Results are quickly very disastrous then.

Tony

At 03:07 PM 6/28/2014, Marcel Van Mulders wrote:
>Ed,
>I bought the cylinderhead from an englishman, Jon Ellison, before that
>I had one from Racetorations, both with bronze valve guides.
>I don't know who actually did the work on these cylinderheads.
>When bronze guides are being installed, I believe the middle part gets
>narrower because that part is clenched in the cylinderhead : this will
>not show up by rocking the valve, so I wonder how the clearance is
>measured : it can't be done by rocking the valve, maybe bij using an
>adjustable reaming tool? Maybe I've been lucky but so far I didn't have
>any sticking valve. If the diameter of the bronze guides is reamed
>after fitting, to the original diameter as it was before fitting, won't
>that be sufficient? Bronze alloy guides must have advantages too, not only
drawbacks?
>Marcel
>
>   _____
>
>Van: EDWARD BARNARD [mailto:edwardbarnard at prodigy.net]
>Verzonden: zaterdag 28 juni 2014 15:59
>Aan: Marcel Van Mulders; 'Michael Moore'
>CC: fot at autox.team.net
>Onderwerp: Re: [Fot] TR4 Valve Guide Clearance
>
>
>Marcel:
>I believe the head your were running on your TR3 was one that I did and
>sold you a few years back. Can't remember if I installed cast iron or
>bronze guides for you. If they were cast iron I reamed them for
>.001"-.0015". If bronze I usually ream them to .003"-.0035" for added
>clearance. It would take a full hand of fingers to count the stuck
>valves we've had with bronze guides reamed to stock spec's. Hard for me
>to justify bronze guides when I have to ream them to worn out spec's to
>get them to work. Oh, and they cost 5x more than cast iron.
>-Ed Barnard-
>
>
>
>On Saturday, June 28, 2014 12:05 AM, Marcel Van Mulders
><van.mulders.marcel at telenet.be> wrote:
>
>
>
>In the Triumph Service Instruction Manual, 0.001" to 0.003" is recommended.
>Maybe steel valve guides will cause no problems,but I believe bronze
>guides should be reamed to the original size  after fitment Marcel
>-----Oorspronkelijk bericht-----
>Van: Fot [mailto:fot-bounces at autox.team.net] Namens Michael Moore
>Verzonden: donderdag 19 juni 2014 14:21
>Aan: FOT
>Onderwerp: [Fot] TR4 Valve Guide Clearance
>
>Is there a recommended clearance for valve guides? I may have a valve
>sticking.
>
>Engine builder just put in oversized valves and new guides.
>
>
>Thanks
>Mike
>
>62 TR4, Race car
>63 TR4, Street car
>
>Mike & Becky Moore
>6050 Ruhl Road
>Fairview, PA 16415
>
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