Stroker kit vs. stock crank with higher compression

[BTF/PTM]

I have a two part question for our resident engine builders. Use the bore/stroke of an L28 for comparison.

First, is the power/torque gain for a fun-to-drive street/autocross powerplant with a full 3.0L stroker kit using 10:1 pistons worth the added expense compared to just using new 10:1 pistons and sticking with the L28 rods and crank?

Second, I've read that stroker V8 engines like more aggressive cams and tend to "soak up" the lumps & idle smoothly. Does this apply to our L engines as well? I suppose a way to objectify the question is, would a stroker L30 prefer a cam that's a step or two up from a mildly more aggressive cam made to hop up a stock-block L28?

Thanks, everyone.

[Z train]

If the stroker will not put you in a financial bind,do it.I have two.One is a 3.1 and the other is a LZ-23 and i wouldn't trade either one of them.

[doradox]

I have a two part question for our resident engine builders. Use the bore/stroke of an L28 for comparison.

First, is the power/torque gain for a fun-to-drive street/autocross powerplant with a full 3.0L stroker kit using 10:1 pistons worth the added expense compared to just using new 10:1 pistons and sticking with the L28 rods and crank?

Second, I've read that stroker V8 engines like more aggressive cams and tend to "soak up" the lumps & idle smoothly. Does this apply to our L engines as well? I suppose a way to objectify the question is, would a stroker L30 prefer a cam that's a step or two up from a mildly more aggressive cam made to hop up a stock-block L28?

Thanks, everyone.

All things being equal 3.0/2.8 = 1.07. So 1.07 times more hp for the 3.0. In other words if your hypothetical 2.8 made 200 hp your 3.0 would make 214 hp. That's an expensive 14 hp.

Steve

[BTF/PTM]

I certainly can't say that money isn't an issue, but I can say that an extra grand to go with a stroker setup - I'll use the Rebello kit as an example since it's well portrayed and a trusted product - compared to just the piston upgrade is something I'm willing to spend if it really will make the car more fun as a spirited street driving/slalom car. 14hp obviously wouldn't make it worthwhile, but there are torque numbers and cam combination numbers to think about so hopefully there is more feedback coming

[Travel'n Man]

I just got finished with a L28-N42 rebuild. Much more torque than I use to have. I will dyno this next driving season but I'm sure I a little over 200 hp and torque. Best money I have spent to date. Dave Rebello knows what he is doing. Give him a call!

N42 Block - Boiled-Bored-Honed-Balanced

N42 Head - Rebello Custom Euro Ported

Rebello Stage II Cam - 268/.480

Rebello Custom Flat Top Nissan Pistons .40 over

Rebello Balanced 240 Rods

Compression 9.9:1

[Z train]

All things being equal 3.0/2.8 = 1.07. So 1.07 times more hp for the 3.0. In other words if your hypothetical 2.8 made 200 hp your 3.0 would make 214 hp. That's an expensive 14 hp.

Steve

You left the torque out of your equation.My LZ-23 had a FIFTY percent increase in torque.

[Oiluj]

I'll second what Travelin Man said. My Rebello 2.7 L upgrade dyno'd at 212 HP and about 200 ft-lb of torque. Think my compression is closer to 10:1 with a stage 3 cam.

Only downside is slightly rough idle. Not bad, but no longer silky-smooth. But if you want performance, it's the way to go.

[gnosez]

My Rebello (12:1) does 314@crank so (money) pistons, cam and head do make a difference.

Right now we are planning a race motor to throw into our 240 using the E31 head shown below and the Mikunis (both from the BSR 240). We thought we could just bolt on the triples after refreshing them but it seems they've been ported out to 50mm and instead of the small venturi,a race tube was soldered in. Taking the tubes out to insert smaller venturis would be a major pain so now it's engine building time.

So much for fixing my street Z this winter.....

[doradox]

You left the torque out of your equation.My LZ-23 had a FIFTY percent increase in torque.

No, I didn't.

Remember I said "all things being equal". For identical rpm ranges you would have a 7% increase in torque because HP= torque(ft*lbs) *rpm/5252. At a given rpm a 50% increase in torque is a 50% increase in HP.

.2 liters alone aren't giving you any 50% increase in HP.

Steve

[Z train]

Stock L-20B

HorsePower -@ 112 @ 5600 RPM

Ft. lbs. Torque 108 @ 3200

Keep in mind,these numbers are at the flywheel .

Below are my actual numbers at the wheel.

Edited October 5, 2010 by Z train

[conedodger]

You left the torque out of your equation.My LZ-23 had a FIFTY percent increase in torque.

I agree... HP doesn't really mean much with stroker motor. Torque is everything about how we drive these things while HP is just number that most of you are lying about anyway.

[ozconnection]

Anytime you start playing around with cranks rods and pistons, you're bound to change the characteristics of the engine compared to what it was like before.

Compare an L24 with an L28. Different bore, rods and crank mean the same thing here too, the characteristics of that engine are different.

Throw in things like rod/stroke ratios, cylinder heads, camshafts, induction systems and exhaust setups and you'll quickly see that the answer you seek is not easily obtained from just a few lines written here.

Go over and read the stroker stuff on Hybridz...there is some solid info written by some very talented people. This discussion falls heavily into the modified engine section.

Good luck with your project.