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Posted: Mon Jan 20, 2014 9:10 pm
by Geoffbrown
I know this won't help but you might be interested to hear about my cammy, it has some strange +60 pistons in with three compression rings. I thought they maybe from an Austin 7, but this appears not to be the case. My bores are barrel shaped just over a thou or more in each, there is loads of skirt clearance, in the order of seven thou as I recall, but with new rings in recently (and a new bottom end from Alfa) it is as sweet as anything using top to bottom of the dipstick marks in just over 100miles. Excellent machine......

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Posted: Mon Jan 20, 2014 11:55 pm
by Wali.Badger.Taylor
ian.scott wrote:I often used aluminium buttons in my racing engines due to doubts about the circlips , they were easy to make and effective.

Ian

Ian, what did you rev to with ali buttons?

Posted: Tue Jan 21, 2014 7:07 am
by Nick.Wilson
Just found these on my daily browse for parts on eBay.
I would imagine you might have already seen them, but if not, here you are.

http://www.ebay.co.uk/itm/Ariel-600cc-o ... 3389face0d

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Posted: Tue Jan 21, 2014 7:50 am
by paul.wirdnam
Nick.Wilson wrote:Just found these on my daily browse for parts on eBay.
I would imagine you might have already seen them, but if not, here you are.

http://www.ebay.co.uk/itm/Ariel-600cc-o ... 3389face0d


Thanks Nick....I hadn't seen them but they are listed as for the pushrod 600cc engine...not the 4F.

Having had a very useful PM discussion with Ian Scott, I'm going to re-use my existing pistons with aluminium buttons in the gudgeon pins.