TR65 cams

Fast Eddie

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• Jul 11, 2019

• #1

Chaps (and chapesses),

Does anyone know what cams, and cam timing, were used in the late model short stroke TR65 Thunderbird engines?

 

L.A.B.

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• #2

There were no specific camshafts for the TR65 according to the '82 parts book (so same as T140, 71-7016 & 71-7017).

TR65 valve timing according to the manual "CHECKED WITH NIL TAPPET CLEARANCE AT T.D.C.":
Inlet - 0.151"/ 3.83mm
Exhaust - 0.088" / 2.23mm

 

Fast Eddie

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• #3

Thanks LAB.

 

L.A.B.

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• #4

Also, according to the factory manual, the standard TR65* cam wheel marks are:
Inlet cam wheel dot aligns with intermediate dash.
Exhaust 'X' aligns with intermediate dot.

*Edit (Not TR65T)

 

Fast Eddie

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• #5

What was the difference with the TR65T? Different timing or different cams?

 

L.A.B.

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• #6

Fast Eddie said:

What was the difference with the TR65T? Different timing or different cams?

Click to expand...

Timing marks are different and it seems it could have had a different (71-7349) inlet cam, same as the TR7T.


https://www.ebay.co.uk/itm/TRIUMPH-...83.l10137.c10&nordt=true&rt=nc&orig_cvip=true

Apparently there was also a TR65S model which had standard 71-7016/71-7017 camshafts.

 

Fast Eddie

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• #7

Aha... I’m familiar with that cam, it’s somewhat like a higher lift 3134 profile. Makes sense. Thanks again LAB.

 

Charles Waggett

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• Nov 29, 2021

• #8

They have the same cams as the TSS. 71-7349 and 71-7449 ,I believe.