[TR] Ring gaps

[Tony Drews]

I had to go to 0.017 for the top ring, Grant 
rings, 87 mm pistons in a race motor.  Less than 
that and I broke rings.  0.014 for the middle 
ring.  Used to run less with Deves rings.  You 
may need a little less on the street, but it's 
mainly a function of how hot things get.  A few 
thou too much is way, way better than one thou too little.

For your friend, 0.040 is a lot of end gap, 
something is worn more than I'd be comfortable 
with.  Have to measure things to figure out where the wear is.

Tony Drews

At 03:02 PM 2/12/2016, Andrew Uprichard wrote:
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>
>The manual for the TR3 says the ring gap should 
>be 0.003 – 0.010.  But I have new pistons and 
>rings marked that the gap should be 0.003 – 
>0.004 per inch diameter of the bore.  3 thou 
>sounds awfully tight to me, but what do others think?
>
>On a related subject, a friend has an engine 
>where the ring gap is 0.040.  How much of this 
>could be made up by simply replacing the 
>rings?  Or is there a point at which the only 
>solution is bigger pistons +/- rebore?
>
>Andrew Uprichard
>
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