juffer

are they standard or are they a tuning part?

sm

pretty sure they are std pistons

juffer

the reason i was asking was because i thought OE was standard.

Fiecos Dan

they are a pattern part piston.


but Tim ( Grey S2, nms RST) used them for over 300 bhp with out issue.


I built a RST engine last month using them, but the C/R did come out abit higher than std mahle's.

juffer

thanks for that. i take it that standard rods fitted to these would be no good for about 18 psi.

Dragsteer

AE cam , is this cam good? I have offer for new AE cam , 50 pounds

sm

rods will be fine i used to run my rst at 18psi on std rods for 3 years with no probs the rods are at there max at about 230bhp

pa_sjo

Mahle = OEM
AE = Pattern

OE = Original Equipment (see above).

juffer

so basically a AE piston is the same as a standard item but an aftermarket make.

pa_sjo

Yes.. AE are one, if the the biggest piston manufacturer in the world.

Dragsteer

So AE cams are standard cams? I mean standard to specifications

gee1599

AE pistons are made to OE spec
i have a set here and thats what is says on the box (but mine have been skimed)

davsmith64

i broke my AE piston in 4 pieces between the piston rings..

Fiecos Dan

Why did it happen tho?

JamboRS

prob same way it happened to mine, det

sm

same happened to me due to too much boost and not enough fuel

Fiecos Dan

Thats why i asked, as this problem might not be down ti any fault of the actual piston.

davsmith64

when i took the piston to the machinists he rekoned it was because the car was running too much compression.. i was running 16 psi at 230bhp

Dragsteer

so boost kill him?

davsmith64

i rekon so

juffer

am i right in thinking that with a good healthy engine you can only run a maximum of 18 psi with these pistons and standard rods. a bigger front mount cooler and actuator are fitted.

Fiecos Dan

Your wrong,


As i said earlier in this thread, Tim used to run 300+bhp on these pistons.

And his car does 165+ mph, 12.7 1/4 miles, and often does trackdays.

rstdave

iTrader: (3)

I'm still using them in mine, runnin 245bhp at 1.5 bar boost with no issues....just had the head off as it happens and there are no signs of wear. To be honest most melt downs are due to poor mapping/fuelling, mine's on omex and mapped correctly i don't think it's the pistons that cause any problems

Rick

i'm running 1.7 bar on a totally std bottom end atm (sorry rich )

T28 RST

Was it standard compression Dave coz im running similar power and boost

As Jamie said it was probably down to detonation that your piston went bang

Rick

compression pressure and boost are two different things

juffer

i was getting my figures from a performance ford mag about 6 months ago when they did a veview on the cvh turbo. it says the crank is tough as old boots but the rods will give at 19 psi boost. why do they print this if it is not true?

Billy_RS

iTrader: (5)

pa_sjo

.. because they're not engineers and rely on chinese whispers (or opinions from 'expert tuners')..

I know reputable tuners who run at least 1.5 bar on standard rods (with machined pistons).. with zero problems in the last 20 years.

Fiecos Dan

boost can not be related to stess on the engine unless they stat the turbo being used.

as a std T3 on 19 psi = 180bhp ish

19 psi on a T34 will be 250bhp ish, and so on.

juffer

these figures were based on a standard engine with standard turbo. I was going to go down the route of mahle pistons but i cant see the point now.

Fiecos Dan

What was writin in the mag then was a very safe margin power range.

juffer

it was just a break down of the engine. it basically siad that the head flows pretty well as standard, the pistons were ok for 20ish psi, rods ok for 19 psi. the flywheels are know to fly off. ect. it basically said that if your going over 1 bar you need to start uprating the engine.