stock piston hp question

[DubbyDoo]

whats the max you can get out of them before they goo boom? and also are there any forged rods that are a direct fit for them without machining them

[justanothermp5]

i also would like to kno the answer to this, and if i could contribute a question
if u go with lower compression pistons on an NA do u lose horsepower?

because i dont want to lose my car while i get up the money to buy the parts one at a time

[funktownp5]

Its not so much the pistons that are going to make the engine fail, its the

connecting rods that are the problem. Me personally have been running ~190

WHP for 2 years and ~230WHP for the last year without any problems. You

will also probably run into transmission problems before the motor goes too. If

you are conservative with the timing and dump alot of fuel you shouldnt have

many engine problems.

[DubbyDoo]

well im building an engine to be around 300 whp and im wondering what the stock piston max hp is

[ForceFed]

If you are spending the money to get your Car to 300HP...The price of new forged pistons WON'T break the bank.
It's a mere Drop in the Bucket.

Trust me.

[justanothermp5]

ok so ingore my question? lol and im gonna be in the same range as dubby with my hp levels,
so any info would be useful, personal expierences, which brand is better and what not

[ForceFed]

Yes..Lower compression pistons on an Identically tuned car...ie. Stock ECU tuning ....Would net less HP in NA stock form.

[Captain KRM P5]

well im building an engine to be around 300 whp and im wondering what the stock piston max hp is

if you're building an engine for 300hp you will need rods. seeing that without machining the piston or the rod to accept one another, you won't be able to use the factory piston with an aftermarket rod. and you won't be making 300hp on the factory rods. there are the few guys out there with what seem like flawless tunes who can make 280hp on the factory engine. this is far from the norm most people with popped protege motors will tell you.

so then the question becomes, do you need to go lower compression to make 300hp. most pistons come in two trims on the shelf; 8.5:1 (lower) or 9.1:1 (stock). lowering the compression ratio does alot of things; it allows for cooler combustion temperatures, exponentially more boost to be run than on higher compression, less risk of detonation with proper tuning and the ability to run more timing while running increased boost. more timing equates to more power, typically more power than just changing the fuel settings. you may hear that you lose low end or torque or low end power with going lower compression, and frankly thats pretty subjective person to person at best. being able to run more boost and run more timing in boost thereby making more power far outweighs any disadvantage, perceived or otherwise, by running a half point lower compression piston. plus if you have a standalone, its very easy to increase power in the low end and compensate there for any lower compression 'loss'.

most of the highest dynoing and fastest 1/4 mile proteges i know of run 8.5:1 or lower. this really is not a debatable fact. once you get close to 300whp you start encountering whole new sets of problems - blowing out spark, insufficiently flowing heads, weak coils, high combustion temps. the higher the compression ratio, the more you are going to accentuate these problems. besides, if you are spending the several thousands needed to build a 300hp motor, it would be pretty nice to have it be able to go beyond that should you ever be inclined to build the transmission to handle more power yet. to me, there really isn't a compelling argument to building a stock compression motor especially if your goal hovers around 300hp.

and for the person who asked up top, lowering the compression ratio of an N/A would most definetely lose horsepower. if you want to stay N/A, higher compression is the way to go.

[justanothermp5]

ken u are the man, and im not staying NA, just wondering if i could still drive the car with the pistons before i put the turbo in, and u answered that

just have to save up now, alot lol

[ForceFed]

and for the person who asked up top, lowering the compression ratio of an N/A would most definetely lose horsepower. if you want to stay N/A, higher compression is the way to go.
Didn't I just say that? (braindead
LOL!

[dmjddm9999]

to produce 300whp your definatley going to need to install forged piston and rods. Our stock internals are only rated for about 250whp.

[ForceFed]

to produce 300whp your definatley going to need to install forged piston and rods. Our stock internals are only rated for about 250whp.Good luck keeping a Stock Rod Straight at 250HP.

[justanothermp5]

Didn't I just say that? (braindead
LOL!

oh sorry, didnt give u credit

ur the man!!

there happy? lol

[ForceFed]

Sure...LOL!

[jeffmsp]

it also depends on what fuel you are planning on using and the overall efficiency of your system. If you run 91, then you are going to have to lower it.

[SeR_Cyclops]

hey 250 is not close to rich's 275!?!?!?!

[jeffmsp]

or tekkies 255whp stock motor dynos. or blkzoomzooms 250whp+ stock motor 100+ runs on the track...

[Captain KRM P5]

hey 250 is not close to rich's 275!?!?!?!

rich is one of the very few - on pump gas i might add, actually he is exactly who i was thinking of when i made that post