11 replies to this topic

[clivemk1mini]

I'm going to build a 1293 engine and then supercharged it. My question is what pistons should I use I've found some hepolite +20 low comp pistons that say the ratio will be 8.8.1,

Some people say to use forged pistons then others say there not needed.

So not sure what to go for any advice would be great

Thanks

[metrovan88]

its all dependent on the power output that you are looking for?

hepolites arent majorly recommended for turbocharged or supercharged engines.

one of the best pistons around are omega which are more suitable for the engine your thinking of.

if your looking into less than 200hp then cast omegas should do the job.

a new set with rings can be picked up for around £340 i think

[clivemk1mini]

Thanks for the reply

My spec is
Austin 1300gt block going to bore to 1293
Stage2 head
Kent 976 cam
Megajolt system
Possibly straight cut gearbox
Eaton supercharger blow through system

[clivemk1mini]

Will those be suitable for my spec I can't see that I would get near 200hp

[new_zealand _minis]

with blow throught . you dont need to drop the comp as much as you would with suck through . just get some 6.5 cc dish good brand and open up the chambers

Edited by new_zealand _minis, 07 October 2011 - 07:53 AM.

[clivemk1mini]

I'm toying with going for the omega cast +20 10cc dished pistons. @ £300 what do you think

[new_zealand _minis]

for peace of mind i would go forged .. but thats up 2 you

if you go 10cc dish piston and 26 cc chambers . you will have 8.7-1 .. so that shuld be good or 24cc chambers and you shuld still be fine

oh you can do what i did . get the .20 forged 16cc dish isas pistons from mini speed . then you dont have to touch the chambers with std chambers you will have 8.45-1

[Turbo Phil]

The cast Omegas are a good piston & well proven. On a standard block you'll find they sit around 0.040" down the bore, so they actually give about 14cc volume inc the dish.

Phil.

[HUBBA.HUBBA]

for peace of mind i would go forged .. but thats up 2 you

if you go 10cc dish piston and 26 cc chambers . you will have 8.7-1 .. so that shuld be good or 24cc chambers and you shuld still be fine

oh you can do what i did . get the .20 forged 16cc dish isas pistons from mini speed . then you dont have to touch the chambers with std chambers you will have 8.45-1

Hello chap,
What chamber size is your head?
Cheers

[new_zealand _minis]

sorry late reply . std chamber size . 20cc ish . and the 16cc dish pistons works out to be 8.45-1

[HUBBA.HUBBA]

Cheers for that, oh and what 's your engne size?

[new_zealand _minis]

1293cc