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Old 24th August 2016, 10:09 PM
hmangphilly hmangphilly is offline
Senior Member
Join Date: Nov 2013
Location: wimborne
Posts: 571

a nice straight and round comp tube is a good place to start.

look at the cross hatching on a std tube and think ...' good effort AA , this has been nicely honed ' .......then put a bore gauge down it ........

cross hatching means nowt .........i can do that with wet and dry on a stick .

i had 2 tubes properly honed .....1 of them is loads straighter than a std tube,..... the other is even better !!!
of course both are a little bit bigger in the bore now

robs std tube , tight at the entrance and looser at the end plug end the numbers somewhere ....

oh ........not so round either

these para seals deffo expanding with temp and causing increased drag.........bit of a sizing learning curve in progress

Last edited by hmangphilly; 24th August 2016 at 10:13 PM.
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