what are the standard 1293 piston dish(es)
Turbo Mini Forums

Im trying to work how much volume needs to be taken from my cylinder head to make it 8.4:1 CR.

Ive taken some of the values from the Afracing site but im unsure on my dish sizes.

When I bought the pistons i was told they were 1293 15CC dished 'standard pistons', as I now know they never made any, and that explains why I got a sudden woft of sh*t when he was telling me the spec!

Did they only make them in one dish size?

I believe the standard pistons are 70.61 Dia as mine are +20thou (or 0.5mm give or take) that should make them 71.11 Dia shouldn't it?

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1/4mile in 13.2sec @ 111 terminal on 15psi

only way is to measure the dish. could be anything!!

they may be 15cc forged pistons if your really lucky...

Ive read Dave's post from ages ago, about measuring the depths for dish sizes but Im guessing the figures only apply to 1275 pistons?



would it be accurate enough to use a suringe (Spelling!?) with parafin in and drip it in till it fills the dish?

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1/4mile in 13.2sec @ 111 terminal on 15psi

A syringe to measure the dish is fine, that is one of the best ways to do it TBH.

One way of making it easier, get an old clear CD case, drill a hole in it, then smear a touch of grease round the edge of the piston crown. Press your cd case down with the hole over the dish, the grease helps to seal it. Then you can use your syringe through the hole to fill up with paraffin, white spirit or similar until there is no air left under the cd case.

Thats a good idea actually!

I'll try and measure it in the bore though, as Im not sure whether im taking it all apart or not yet.

Just need to find something thats the right size now...hmmmm?

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1/4mile in 13.2sec @ 111 terminal on 15psi