Posted October 4, 201014 yr comment_332542 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. Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/ Share on other sites More sharing options...
October 4, 201014 yr comment_332546 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. Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332546 Share on other sites More sharing options...
October 4, 201014 yr comment_332549 BTF/PTM said: 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 Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332549 Share on other sites More sharing options...
October 5, 201014 yr Author comment_332550 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 Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332550 Share on other sites More sharing options...
October 5, 201014 yr comment_332560 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 PortedRebello Stage II Cam - 268/.480Rebello Custom Flat Top Nissan Pistons .40 overRebello Balanced 240 RodsCompression 9.9:1 Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332560 Share on other sites More sharing options...
October 5, 201014 yr comment_332561 doradox said: 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.SteveYou left the torque out of your equation.My LZ-23 had a FIFTY percent increase in torque. Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332561 Share on other sites More sharing options...
October 5, 201014 yr comment_332563 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. Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332563 Share on other sites More sharing options...
October 5, 201014 yr comment_332566 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..... Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332566 Share on other sites More sharing options...
October 5, 201014 yr comment_332573 Z train said: 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 Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332573 Share on other sites More sharing options...
October 5, 201014 yr comment_332574 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, 201014 yr by Z train Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332574 Share on other sites More sharing options...
October 5, 201014 yr comment_332584 Z train said: 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. Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332584 Share on other sites More sharing options...
October 5, 201014 yr comment_332590 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. Link to comment https://www.classiczcars.com/forums/topic/37291-stroker-kit-vs-stock-crank-with-higher-compression/#findComment-332590 Share on other sites More sharing options...
Create an account or sign in to comment