2.4 Long rod rev limit suggestions?
Jun 23, 2011, 07:18 AM
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2.4 Long rod rev limit suggestions?
So I'm building a 2,4 LR with a factory crank, MAperformance ultimate duty rods, wiseco 1400HD pistons, basically, all the good stuff. There's going to be a 35R with a .70 A/R turbine housing (non HTA) boosting it. The head is built up pretty well, ready to withstand whatever RPM I throw at it.
I'm curious what I can expect to rev this setup to, knowing that it's being built by a mere mortal and not david buschur. (If only)
Also, are there any oiling mods I can do to make this setup safer/ rev higher? Everything I've read points to lack of oil being the reason these engines fail.
I'm curious what I can expect to rev this setup to, knowing that it's being built by a mere mortal and not david buschur. (If only)
Also, are there any oiling mods I can do to make this setup safer/ rev higher? Everything I've read points to lack of oil being the reason these engines fail.
Jun 25, 2011, 01:24 PM
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Buschurs sites says recommended max RPM 9,000 for there 2.4LR
https://secure.buschurracing.com/cat...oducts_id=1653
As for the oil they make better oil pans to keep the oil from sloshing around https://secure.buschurracing.com/cat...oducts_id=1613
https://secure.buschurracing.com/cat...oducts_id=1653
As for the oil they make better oil pans to keep the oil from sloshing around https://secure.buschurracing.com/cat...oducts_id=1613
Last edited by NewEvolutionIX; Jun 25, 2011 at 01:29 PM.
Jun 28, 2011, 07:23 PM
#7
I rev to 8500 daily. My limit is 8750 and don't like to take it past that. Will it live at 9000? Sure it will but how long is the question. I don't want to be the one to find out.
Tom, if you do the math the r/s ratio difference is good for 250-300rpms more if you are looking at mean piston speed. You have to remember that the peak piston speed remains the same since peak piston speed is based off the 100mm crank. So all things being equal, the LR2.4 is safe to 8750 if I had to "guess" based off math. I wouldn't push to 9000 unless you were running out of 4th at the track. Kevin K revs his std 2.3 over 9000 but has to replace parts after every track day it seems
The oil pump starts to become a problem at 9000.
Mikey
Tom, if you do the math the r/s ratio difference is good for 250-300rpms more if you are looking at mean piston speed. You have to remember that the peak piston speed remains the same since peak piston speed is based off the 100mm crank. So all things being equal, the LR2.4 is safe to 8750 if I had to "guess" based off math. I wouldn't push to 9000 unless you were running out of 4th at the track. Kevin K revs his std 2.3 over 9000 but has to replace parts after every track day it seems
The oil pump starts to become a problem at 9000. Mikey
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Jun 28, 2011, 08:05 PM
#8
I rev to 8500 daily. My limit is 8750 and don't like to take it past that. Will it live at 9000? Sure it will but how long is the question. I don't want to be the one to find out.
Tom, if you do the math the r/s ratio difference is good for 250-300rpms more if you are looking at mean piston speed. You have to remember that the peak piston speed remains the same since peak piston speed is based off the 100mm crank. So all things being equal, the LR2.4 is safe to 8750 if I had to "guess" based off math. I wouldn't push to 9000 unless you were running out of 4th at the track. Kevin K revs his std 2.3 over 9000 but has to replace parts after every track day it seems The oil pump starts to become a problem at 9000.
Mikey
Tom, if you do the math the r/s ratio difference is good for 250-300rpms more if you are looking at mean piston speed. You have to remember that the peak piston speed remains the same since peak piston speed is based off the 100mm crank. So all things being equal, the LR2.4 is safe to 8750 if I had to "guess" based off math. I wouldn't push to 9000 unless you were running out of 4th at the track. Kevin K revs his std 2.3 over 9000 but has to replace parts after every track day it seems
The oil pump starts to become a problem at 9000. Mikey
i have been running mine out to 8500 now.. i guess i should just put it at 8100 to be safe. with my combination tho it seems it goes through the gears so fast i dont get no rev time as it is.
honestly my car, just playing around only goes to 7500-8000. Only when I'm racing someone does the motor go to the moon 
Jun 29, 2011, 02:08 PM
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And to kigglys car, from what I was told by a reputable source he revs to 9400-9500rpm and replaces the engine every season or 2 and replaces bearings when needed during the season.
Besides a drag only car do you really want to check the bearings every week or less?
Besides a drag only car do you really want to check the bearings every week or less?
Jun 30, 2011, 09:31 AM
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I rev to 8500 daily. My limit is 8750 and don't like to take it past that. Will it live at 9000? Sure it will but how long is the question. I don't want to be the one to find out.
Tom, if you do the math the r/s ratio difference is good for 250-300rpms more if you are looking at mean piston speed. You have to remember that the peak piston speed remains the same since peak piston speed is based off the 100mm crank. So all things being equal, the LR2.4 is safe to 8750 if I had to "guess" based off math. I wouldn't push to 9000 unless you were running out of 4th at the track. Kevin K revs his std 2.3 over 9000 but has to replace parts after every track day it seems The oil pump starts to become a problem at 9000.
Mikey
Tom, if you do the math the r/s ratio difference is good for 250-300rpms more if you are looking at mean piston speed. You have to remember that the peak piston speed remains the same since peak piston speed is based off the 100mm crank. So all things being equal, the LR2.4 is safe to 8750 if I had to "guess" based off math. I wouldn't push to 9000 unless you were running out of 4th at the track. Kevin K revs his std 2.3 over 9000 but has to replace parts after every track day it seems
The oil pump starts to become a problem at 9000. Mikey
Im planing on doing a build this winter and wasnt sure to go 2.3 or 2.4. My question is you run a 100mm crank with both, but with the 2.4 what length rod are you running on the 2.4? Is it the 6mm+? Im trying to piece together what I need for this build. Thanks
Jun 30, 2011, 09:43 AM
#14
Yes sir, you use a 156mm rod as opposed to the 150mm rod on a 2.3. If you need help with your build you can pm me and take a look at my build https://www.evolutionm.net/forums/ev...tor-build.html
Some of the build is off due to changing some parts around recently as the origanal post was over a year ago. I now have FIC 2150 Injectors, Toxic Fab Single Scroll Manifold, Single Scroll FP Black, Boomba 75mm TB, ETS 3" UICP, ETS 3.5" exhaust, and I'm thinking about upgrading to a 4.5" ETS Garrett FMIC...
Mikey
Some of the build is off due to changing some parts around recently as the origanal post was over a year ago. I now have FIC 2150 Injectors, Toxic Fab Single Scroll Manifold, Single Scroll FP Black, Boomba 75mm TB, ETS 3" UICP, ETS 3.5" exhaust, and I'm thinking about upgrading to a 4.5" ETS Garrett FMIC...
Mikey
Jun 30, 2011, 09:45 AM
#15
Let's get some data-
Kevin very clearly says 9650rpm in his comments in the stroker thread in the Evo Engine drivetrain. I have yet to replace the rod bearings, I attribute it more to tuning style than anything. Lower cylinder pressure is less force on the bearing which translates into longer life.
Kevin checks his bearings often doesnt mean that he replaces them often.
I use Honda as an example, the GSR is 1.58 and revs 10,200 though they breathe well up there with any given turbo combo compared to a 4G63. Ours are 1.56 which is close enough it should follow similar rules. The oil pump doesnt magically fail at any given rpm in our motors.
To THUB, your turbo choice already precludes needing to rev higher than 8k or so as the car isnt going to make power up there anyway. My motor makes peak power at 7800-7900 and I follow the 5% rule on shifting (Pro Stock rule) which is 8300 and then rev 4th to what it needs.
Kevin very clearly says 9650rpm in his comments in the stroker thread in the Evo Engine drivetrain. I have yet to replace the rod bearings, I attribute it more to tuning style than anything. Lower cylinder pressure is less force on the bearing which translates into longer life.
Kevin checks his bearings often doesnt mean that he replaces them often.
I use Honda as an example, the GSR is 1.58 and revs 10,200 though they breathe well up there with any given turbo combo compared to a 4G63. Ours are 1.56 which is close enough it should follow similar rules. The oil pump doesnt magically fail at any given rpm in our motors.
To THUB, your turbo choice already precludes needing to rev higher than 8k or so as the car isnt going to make power up there anyway. My motor makes peak power at 7800-7900 and I follow the 5% rule on shifting (Pro Stock rule) which is 8300 and then rev 4th to what it needs.