What is a safe rev limit for me?
05-04-2006, 07:58 PM
#1
What is a safe rev limit for me? Well guys, I want to get some input as to how high I can SAFELY rev my car. I'd like to go 6500+, but would like to hear some opinions from experts as I'm pretty new in the more involved aspects of the LS1.
-Iron Block 408
-Eagle 4340 4" stroke crankshaft
-Scat 4340 H-beam rods (6.125")
-Comp XE-R 244/248 dur., 612/615 lift
-Comp 850 lifters
-Manley dual valve springs w/ titanium retainers
-FMS hardened pushrods
-Stock GM 241 heads
-ARP hardware throughout
If I don't have the required hardware to spin that high, how high should I rev it, and what are some things I can do to help me in my quest to rev higher?
Thanks,
Alex
-Iron Block 408
-Eagle 4340 4" stroke crankshaft
-Scat 4340 H-beam rods (6.125")
-Comp XE-R 244/248 dur., 612/615 lift
-Comp 850 lifters
-Manley dual valve springs w/ titanium retainers
-FMS hardened pushrods
-Stock GM 241 heads
-ARP hardware throughout
If I don't have the required hardware to spin that high, how high should I rev it, and what are some things I can do to help me in my quest to rev higher?
Thanks,
Alex
05-04-2006, 08:32 PM
#2
TECH Apprentice
Join Date: Aug 2004
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With your stroker set-up, you're building (basically) a torque engine, not a HP engine, although you will be making more HP due to increased displacement. This isn't to say that a stroker can't twist, or make good mid-to hi-end power, but low to mid-end grunt is where you will see your biggest advantage. You're making power in a different way than a hi-reving HP engine. With your set-up, you don't need to depend upon reving the pi$$ out of the engine to make power. There should be no reason you won't be able to kick plenty of *** at 6,500 or below.
Compare the area under the torque curve that your car would show on a dyno, compared to that of a reving/HP engine torque curve. You'll smoke plenty of cars at stop lights without the need for screaming RPMs.
Compare the area under the torque curve that your car would show on a dyno, compared to that of a reving/HP engine torque curve. You'll smoke plenty of cars at stop lights without the need for screaming RPMs.
05-04-2006, 08:47 PM
#3
I agree with you totally, just want to see what people think I can rev to. I just bought this car today as-is and will have it tomorrow. I'll have to find the dynograph somewhere, I did get to see it(469/467). Thanks for the input though.
Alex
Alex
05-04-2006, 08:57 PM
#4
With forged internals a piston speed of 4,000 fpm is a good number to use, 5,000 fpm max.
Based on dyno sheets posted max power should be around 6200 +/- a few hundred rpm. I would say a max rpm around 6,500 rpm should be good.
Based on dyno sheets posted max power should be around 6200 +/- a few hundred rpm. I would say a max rpm around 6,500 rpm should be good.
Code:
SMOKEmUP.com Piston Speed Calc Engine Stroke 4(in) Connecting Rod Length 6.125(in) Rod to Stroke Ratio 1.53:1 RPM ....Av Piston Speed (fpm)....Max Piston Acceleration (ft/sec2) 1000....666.67.....2423.99 1500....1000.....5453.99 2000....1333.33.....9695.98 2500....1666.67.....15149.96 3000....2000.....21815.94 3500....2333.33.....29693.92 4000....2666.67.....38783.9 4500....3000.....49085.87 5000....3333.33.....60599.85 5500....3666.67.....73325.81 6000....4000.....87263.78 6500....4333.33.....102413.74 7000....4666.67.....118775.7 7500....5000.....136349.65 8000....5333.33.....155135.6 8500....5666.67.....175133.55 9000....6000.....196343.5 9500....6333.33.....218765.44
