Does High PSI Boost Destroy Your Engine? How To Prevent It?

[benny]

they are beneficial in the right application.. for mild streeters they not needed
with the extra weight they add to the mass of a spinning engine you could even find that your streeter runs slower..

its like sticking a massive turbo on .. you have boost for 1 k of your rev range...

[RiceThief]

So forged pistons are really non benefitial?

There are alot of benefits of forged pistons, they can handle more power loadings and are more resistant to detonation. The only downside to them are the cost, forged pistons are alot more expensive than cast and usually if you upgrade to forged pistons it makes sense to upgrade the conrods as well, so you have the cost of forged conrods as well. The only downside is forged pistons have a lower silicone content so they expand more than cast pistons, so they can be noisy when your engine is cold.

[oped]

Is the noise bad though. Not from the sound point of view, but with damage to anything else?

[flav]

Take it from the master.......you can have any tune you like, but the cylinder pressures when cranking up the boost OVER 15 are beyond what the pistons were designed for. THAT is WHY they break. Even a perfect tune makes no difference at this boost.

[flav]

......and if u crank it, the clutch is usually the first thing to fry.

[OLD FART]

I must b lucky as i have coated factory pistons in my JB since my rebuild in 01 &run 17psi &7000 rpm ,
Ask GARRY (Kit) & Glenn GSR about it as both have had a number of hot laps with me at the autocrosse track.
Glenn was holding on 4 dear life & 4got 2 take the lens cap off the video camera :roll: rofl
Sorry Glenn I think it was a trick 2 get another ride

[RiceThief]

Is the noise bad though. Not from the sound point of view, but with damage to anything else?

The noise is the norm for forged pistons as they expand more than cast pistons, so its part of normal operation of forged pistons thus wont damage the engine. How bad the noise is from a sound point depends on the engine builder and the clearances they use.

[ROCKETMAN]

[Lancerdriver]

What will a good clearance with Wiseco pistons be?

[sigmaproject]

And the way to raise that limit is with forged pistons?

And another way of boosting safely is to use water injection.
Water injection doesnt seem to get much of a mention on this site. :?

[oped]

And another way of boosting safely is to use water injection.
Water injection doesnt seem to get much of a mention on this site. :?[/quote]

I was just having a look at it. That seems like alot of effort to do.

[C Fernance]

And the way to raise that limit is with forged pistons?

And another way of boosting safely is to use water injection.
Water injection doesnt seem to get much of a mention on this site. :?

It's cause they have fuel injection and can easily put in an intercooler unlike us who fiddle around with carbies.

Intercoolers and water injection basically do the same thing, its just a different way of doing it.

[Starion_Turbo]

i'm going after water injection later in the year hopefully.

[flav]

cooling mist does a nice kit...but these things cost matey!

[Mitsi God]

If you have enough fuel (MPI set up) and either forged or late model evo pistions (which are good for 18-19 psi as factory evo's run these days) you'll be good for 20psi all day. As for the nosie of forge's, i built my gsr-x sigma with forgie's and from cold every use to say "wots wrong with it?" (didn't help the pistons where shitty dencos!) but once warm it was fine, most engines now i put the late model (evo 6-8) pistons in, but u haft the get the rod's machined for gudeons and top end width, no biggie thou. they a quiet and reliable... and of course.... Intercooler! my 2cents