Evo 8 stroker pistons, 1g rods.

[TSI_AWD_FTW]

Wondering what y'all's thoughts were on evo 8 forged stroker pistons .40, on std 1g forged rods. And a std 1g crank with 4g63 head and block. And what would the displacement be, and would it be classified as a stroker or destroker?

 

[donniekak]

The only way for stroker pistons to work properly with a stock crank, is to use a longer rod. The only way to make stock length rods work with a stroker piston, is to use a crank with a longer stroke.

 

[TSI_AWD_FTW]

They should work fine with just a loss of horse power at low rpm, and a lower compression ration, which allows to run a higher psi safely, and would allow clearance for the valves to clear of the timing belt jumps or breaks.

 

[brian9397gsx]

it wouldnt be a stroker or destroker, it would be a 2.0 with seriously low compression that may not even run.

 

[RWD4G63]

They should work fine with just a loss of horse power at low rpm, and a lower compression ration, which allows to run a higher psi safely, and would allow clearance for the valves to clear of the timing belt jumps or breaks.

No, unfortunately your theory will not work at all. Lowering the piston 6mm in the combustion chamber is a recipe for terminally low, if any, compression. It will not work or run.

If you want extra low compression so that you can run higher boost, polish and CC the combustion chambers a bit larger and run a 8.5:1 piston with the head and block decked the absolute minimum necessary.

 

[LandSpeed-DSM]

Swept volume (displacement) comes from bore x stroke x # cylinders.. raising the wrist pin height changes neither of these things. On the plus side, you would now be running non-interference

 

[TSI_AWD_FTW]

The car runs 100% fine, just a loss of power at lower rpm, which I don't mind, I've noticed it actually conserves gas a little better. And the car actually did jump timing, I took of the timing belt, reset ran just like it did before. I was just asking what y'all's thoughts were on the subject mostly, I know it works efficiently just wondering if anyone else ever thought of doing it.

 

[pneumo]

So you've already done it? Have you done a compression test? I'm curious to see what the compression numbers are like. There's plenty of high power cars running over 40psi of boost with 9.0 compression, so I'm not really sure what you'll accomplish from extremely low compression.

 

[TSI_AWD_FTW]

It was 100 all the way across last time I checked. I've debated about putting a decent shot of nitrous onto it expeacially to make up for the power lost at lower rpms. But I probably would never do that.

 

[arrowhead]

What did you do to pistons or rods to make them fit?

 

[TSI_AWD_FTW]

I had to get the rods machined so the wrist pin would fit. And the block had to be bored. That's all.

 

[lasthope05]

It was 100 all the way across last time I checked. I've debated about putting a decent shot of nitrous onto it expeacially to make up for the power lost at lower rpms. But I probably would never do that.

Taking into account the rings , valves and head gasket are good those numbers are horrible. Your CR has to be in the mid 6:1 area. You're not doing yourself a favor power, tuning and longetivity wise.

As you said, your off boost response would be nonexistent and terrible. Tuning wise, it might allow you to run more boost on pump, but as before, at the expense of off boost power coupled with the fact that a static CR of 8.5:1 has worked so well for all around performance for ages with the move to even higher (10.5:1 or 11:1) with the availability of e85. Now with longetivity, if you have a problem with valves leaking down the road, use larger cams that increases overlap and lowers your dynamic CR, or your rings just wear down, engine efficiency lowers and below a certain threshold (cylinder psi) your engine won't even turn over.

 

[TSI_AWD_FTW]

I have 280 cams, I basically just cruise the car I've only boosted a handful of times. Im satisfied with its performance so far. Just thought I'd try something that not so many have tried before.

 

[lasthope05]

I have 280 cams, I basically just cruise the car I've only boosted a handful of times. Im satisfied with its performance so far. Just thought I'd try something that not so many have tried before.

What kind of 280 cams? They differ drastically from BC280 to GSC S3. Also what turbo are you running with them?

I'm sure you wanted to try something different, but a little research would of saved you some hassle. You would of known the Stroker pistons sit much lower drastically lowering your static CR.

 

[TSI_AWD_FTW]

They are bc, so practically a 272, and it's a junk turboxs t70.

 

[arrowhead]

I had to get the rods machined so the wrist pin would fit. And the block had to be bored. That's all.

Was a bushing put into the rod end.

Besides thinking you are not doing your engine any favors, I want to know if it was done properly.

 

[RWD4G63]

Was a bushing put into the rod end.

Besides thinking you are not doing your engine any favors, I want to know if it was done properly.

You usually don't put a bushing in press-fit rods. Just machine them for the 22mm pin and go.

 

[TSI_AWD_FTW]

Was a bushing put into the rod end.

Besides thinking you are not doing your engine any favors, I want to know if it was done properly.

I honestly do not remember, the machine work was done a little over a year ago.