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Discussion Starter · #1 ·
ok, i read MichealDealney article on Engine Package: Swapping Parts for power at least 4 times, and read up on a few other articles. however, i am still i little confused. I want to raise my CR in my ls, by swapping b16a rods into my ls since its a direct fit. this willl raise my CR but where will my power come in? more low end? more high end? or will i simply have to dyno it. also, after the swap, since my car is OBD I, im guessing i should take it to the dyno anyway and reprogram it? what are the effects if I didnt take it to get tune/reprogrammed after the swap?
 

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Not sure about the power gains, but I know my buddy has b16 pistons in his 94 LS and just a CAI and it hangs with GSR. Not sure if it was such a bright idea or what the point being of just doing pistons and with the cleareance issue's with the valve seats and what-not, but hey whatever floats your boat.

GoodLuck.
 

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you go to Rutgers University undergrad right? what's your major?

static CR has to do with combustion thermodynamic efficiency. The peak torque location has more to do with volumetric efficiency: IM, cams,displacement, exhaust sytem.the only way pistons can affect powerband performance directly is by the piston crown's shape and how it affects flow coming into the chamber and scavenging (eg. a big high surface area crown that also blocks scavenging across the intake to exhaust valve may affect high rpm power).

the engine is a compromise between breathing vs. burning efficiencies.
 

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You raise compression by changing piston dome height, milling the head, or changing head gasket thickness.

I didn't see anywhere in the Article that rods effect compression.

However, read up on Rod/Stroke Ratio and see what B16 rods will do to your R/S ratio in your B18B engine. I don't think you will like it.
 

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Discussion Starter · #5 ·
sorry, i meant b16 postons not rods. ur right, i dont like what b16a rods would do yo my rod/stroke ratio lol.

yes i go to ruters in new brunswick. business management.
 

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RuPace12 on Mar/26/04 said:
I want to raise my CR in my ls, by swapping b16a rods into my ls since its a direct fit. this willl raise my CR but where will my power come in? more low end? more high end? or will i simply have to dyno it. also, after the swap, since my car is OBD I, im guessing i should take it to the dyno anyway and reprogram it? what are the effects if I didnt take it to get tune/reprogrammed after the swap?
I knew you meant pistons instead of rods once you started discussing CR. The pistons don't directly affect powerband location.

it'd be a good idea to consider what cams you run with them though.

The cams affect both powerband location and cylinder pressure/burn efficiency.

as for tuning, after a CR change you should fuel tune so that you don't have a lean situation and grenade the motor.
 
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