bluliz Posted July 22, 2006 Share Posted July 22, 2006 How reliable are these? or more to the question how much can the standard pistons take? i'm looking at about 220 to 240bhp. thing is a decomp plate is £20 posted, but pistons are about £4-500 also what else needs uprating at 240bhp?? Link to comment Share on other sites More sharing options...
SaMMy125 Posted July 22, 2006 Share Posted July 22, 2006 also what else needs uprating at 240bhp?? ARP conrod bolts from burton power thinkin around £70 but was long time ago Link to comment Share on other sites More sharing options...
Ex-Finesse Posted July 22, 2006 Share Posted July 22, 2006 You don't really need ARP bolts unless you're going above standard rev limit, but it's good security given the additional stresses. Rob, you need to be looking at forged pistons at those power levels, unless you want a drag engine, which'll only be under load for brief spells. You won't need a decomp plate if you get forged pistons and have them machined to the correct CR (IRO 8:1). It's not a case of standard pistons can't take XXX bhp. They have been proven to take 250bhp, maybe more, but for what time I don't know. Fact is more power = MUCH more heat, and I would put money on std. pistons failing quickly when you have a long motorway thrash, with constant boost and heat even with power levels not exceeding 200bhp. You need management with a MAP sensor. MTX box will stuggle at 240bhp, but will last for a while. Link to comment Share on other sites More sharing options...
sortedford Posted July 22, 2006 Share Posted July 22, 2006 rob, jim herne whomade a guide for ZVHing on his website quantums.info hes running fairly big power no problems, he has skimmed pistons (standard pistons) mad for it build alot of ZVH cars at that power with decomp plates no problems Link to comment Share on other sites More sharing options...
Ex-Finesse Posted July 22, 2006 Share Posted July 22, 2006 I presume by Rob, you meant Ralph. As I said, std. internals can take high horsepower. This must be for drag purposes though, or for people you simply don't know how to drive hard. Std. internals are strong, yes, but factor in the kind of cylinder temps you will see at 240bhp, they will be weakened and I beleive they will break. When I have the time and inclination, I'll build one of these cheap ZT things Link to comment Share on other sites More sharing options...
sortedford Posted July 22, 2006 Share Posted July 22, 2006 no i meant rob as he asked Link to comment Share on other sites More sharing options...
Stu Posted July 23, 2006 Share Posted July 23, 2006 Theres nothing wrong with using a decomp plate with standard internals.. the rods are fine.. the crank is fine.. the pistons should be okay.. more importantly is how compromised you make the rest of the system.. if you use a decent turbocharger and get someone decent to map the car, then it'll be fine.. but a set of Vauxhall pistons for 300 quid shouldn't be ignored.. Have a peep at my guide for more info.. http://turbo.me.uk Link to comment Share on other sites More sharing options...
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