Alexander Joseph H wrote:
>
> Friends of Triumph.
>
> We have one book that says that .125 milling will get you about 10.5:1
> on a TR head and this seems to be borne out by one of the FOT
> calculations.
>
> The book goes on to say that .150 milling can be done without any
> trouble but later on it says that .250 is achievable.
>
> Our preliminary look says that it will take about .185 to get near
> 11.7:1 (without pop-ups.)
>
> THE QUESTION:
>
> If I have to take off .185 of the head, what are the consequences, if
> any?
>
> Clearances? Thin castings to water passages? Thin squish area?
>
> I have cleared the thermostat housing base on older heads and modified
> the intake/exhaust manifolds & gaskets to clear...but I have not gone
> beyond about .130 in the past
>
> It appears that a chamber of 42cc will get me close to 11.7:1 and we
> plan to pour 42cc in the chamber and measure from surface of the head to
> the fluid to determine the mill rate.
>
> Perhaps I should call the Guhru Glen Effinger, eh Jeff? Dont have his
> number....
>
> Thanks,
>
> Alexander Racing
Joe, just got back from SVRA, Roebling Road. John Harkness can tell you
what happens if you get the head milled to thin!!!!! Call Glen at
407-283-7700. Mike came in second in Group 3 behind Bob Moser in his
V-8 Daimler SP250. What a race, Mike was up his tail pipe, drifting
around all the corners until half way through when he lost it, did a 360
spin to the left, then a 360 spin to the right, and then drove right
back on the track. Caught Moser by the last lap, but could not get
around him. Great weekend! I won my class (5th overall out of 9 FFs)
in the rental Lotus 51 FF, only because the guy in front of me missed a
shift, and spun out right before the checkered flag. Right in front of
me to boot!
Later............
Jeff
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