? on compression reduction

[TRD StreetRacing]

I know that our car'z has high compresion cuz it's a high rev' motor.....and if we wanna run NE form of forced induction we have to reduce it.....my question is........if we reduce the compresion w/ pistons, gaskets...ect....does it have NE effect on the "lift" part?

p.s- i'm still kinda a newbee so please don't flame if that was a dumb question:(

[oldster]

No, just reducing the compression will have no effect on the mechanical function of the lift.

[t2000gts]

what about ability of engine to rev high, no effect right? can you rev to 9000rpm with 8.5:1 compression?

[oldster]

Yes

[TRD StreetRacing]

thanx oldster.......u mean to say if and when i run boost i can set it to hit at 4000rpm (w/ a boost controller that is) and then "lift" at 6000rpmz??? sounds very interesting:naughty: :evil: :naughty:

[oldster]

Yes

[kabal57]

They dont affect your hp output or anything like that? If they affect nothing negatively, why would any carmaker make super high compression engines like ours?

[gts24]

Originally posted by kabal57
They dont affect your hp output or anything like that? If they affect nothing negatively, why would any carmaker make super high compression engines like ours?


Not sure what you are asking here. If you are asking, By dropping compression, will it effect current performance of the naturally aspirated engine?...

Yes, If you drop the compression level of the engine, without shoving some boost down it's throat... it wont' put out as much horsepower.

That's why guys that want to make an n/a monster out of this engine will probably be upping compression.

[TRD StreetRacing]

Originally posted by kabal57
They dont affect your hp output or anything like that? If they affect nothing negatively, why would any carmaker make super high compression engines like ours?

i know what u mean.....in a way i had the same question in my mind.......and gts24 kindda answered my question

[gts24]

Originally posted by TRD StreetRacing
i know what u mean.....in a way i had the same question in my mind.......and gts24 kindda answered my question


Basically, part of the reason they are able to get 180 hp stock out of a 1.8 litre engine (100 hp/ litre) is partly do to the "high" compression ratio.

"lift" would still work if the compression was dropped, but we'd have less horsepower with lower compression pistons.

So lowering compression without adding forced induction is just useless.

If you want to make the Celica an all motor force. You'd probably want to up compression starting with higher compression pistons. Better strength rods, valves, springs, retainers........
New cams, header, etc.

[TRD StreetRacing]

i get what u mean gts24.......so if i decide to go w/ all motor work(if we get a greater range of stuff) then i lose the chance to add on any kinda forced induction cuz when u do motor work it will up the compression. In a way that kinda sux cuz most other cars that do motor work and then slap on a turbo gets a greater outcome. In a way it's one or the other:angry: :mad: :angry:

[gts24]

Originally posted by TRD StreetRacing
i get what u mean gts24.......so if i decide to go w/ all motor work(if we get a greater range of stuff) then i lose the chance to add on any kinda forced induction cuz when u do motor work it will up the compression. In a way that kinda sux cuz most other cars that do motor work and then slap on a turbo gets a greater outcome. In a way it's one or the other:angry: :mad: :angry:

Well, there's in's and outs to all of this stuff. You wouldnt' Necessarily have to lower the compression to add forced induction. If you simply built up the existing internals, you could run more boost on the stock compression level. There will be turbo kits that will run on stock internals... (their already are..... according to the forced induction forum)

There's so many ways to do 18 milliion different things. The Celica's aftermarket is coming around, and there will be plenty of options!

[TRD StreetRacing]

i think that will be the smart thing to do. the the internals and then run boost or NE other motor work. since the fact that if i or NEother person runs boost, i will wanna run more that 4-10lbs of boost. this way if i run like 15lbs boost:chuckles: my intern'z can handle it. any idea how much to forge intern'z. i know it depends on places but NE idea?

[TRD StreetRacing]

gts24 thanx for schooling me on this:thumbup: :applaud: :bowdown: