I've used Hepolite pistons, In fact I have a set of their 21251s in Barney's 1293, it's done around 10,000 miles or so and uses NO oil.

My last 1310 I built got Mahle forged flat top pistons- I took them out of the Mk2S motor (they were still good), bored an 1100S block to suit, and fitted them with a Hepolite ring set. It never used much oil either.

I reckon it mostly depends on the rebore job, particularly the final honing. There are tricks to getting it just right so the rings bed in quickly. Ask Graham Russell to do it, he knows the tricks.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

ok now im losing alot of power at random on hot days when i need to idle alot like in the city if i open the oil cap should i feel a rush of air coming out?

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Enjoy Chris

no

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Videos - Turbocharged A-Series on Dyno & at Wakefield
Mafs waz not my strong subgeckt at skkol

any possible solution Breathers opened or shut, new oil cap, hammer it untill its fixed cheers

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Enjoy Chris

if you open the cap and a sudden rush of air comes out then the crankcase is not breathing properly. Check for blockages i guess

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Videos - Turbocharged A-Series on Dyno & at Wakefield
Mafs waz not my strong subgeckt at skkol

its not so much sudden as constant maybe my breather tube isnt sucking

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Enjoy Chris

the crankcase always has air inside trying to escape (except dry-sump) from blowby of rings and valve guides etc. If what you are talking about is a constant pulse of air then possibly your compression rings are gone or it's normal?

Given that you have 165psi pressure after compression test I doubt there is anything major wrong with the rings, however the exhaust guides may be worn allowing extra air into the head/rocker cover area. This combined with the 'normal' blow-by might add to the amount coming out.

What are you comparing these symptoms to?

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Videos - Turbocharged A-Series on Dyno & at Wakefield
Mafs waz not my strong subgeckt at skkol

i have nothing to compare to only have a single mini on the road thats why im asking all you guys cos im not that experienced i think i managed to drop cylinders today im hoping it was lose spark plug leads

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Enjoy Chris