Long rod motors?

[Shane@DBPerformance]

Brent got rid of his dry sump a long time ago due to crank problems. DSM oil pumps make too much oil pressure to begin with once you remove the balance shafts and they rarely fail, unlike on some cars like Hondas. So we don't have to worry too much about aftermarket oil pump gears and such, unless you want to do a dry sump system.

[Shane@DBPerformance]

So for a turbo motor you want the rod ratio lower then a NA motor, so the piston is not at TDC as long.


No, it's just that the 2.0 rod ratio is good enough already. You never want a bad rod ratio, the question is just if the hype is worth all the extra effort. Especially, when it really doesn't help the piston speed problem on the 2.4l.

[JET]

it also cuts parasitic drag since the crank doesn't have to plow through all that oil anymore
What the hell are you talking about?? The crank doesn't get changed at all, just the rods and pistons.

[1ViciousGSX]

Marco "claims" that in theory, based on the geometry, the rod ratio difference is worth about maybe 200-400 rpm more, but in practice it's worth alot more.

My main reason for going with the long rod version is not because it was the most expensive (althought some might think differently ;) ), but because I wanted the "best of both worlds" so to speak. I wanted the longer stroke of the 2.4L for my heavy car, but I also wanted the ability to turn higher rpms with less chance of scuffing the pistons/cylinder walls that can happen on a high rev'ed 2.4L

[EclipseGST]

I'm not a fan of Marco or what he "claims"! Long rod motors seem overrated and so does dry sump oil pumps. Just my $.02~


Off topic: Welcome back Mike.

[FattyBoomBatty]

use some 2.6 rods with some really thick bearings.

[SlowWhite]

I wondered about the oil thing ever since my motor went. One of the things I changed was reving my car to 8200rpms regularily. Thought Oil starvation was one of the reasons my motor went? And didn't even think to wonder about oil until my brother mentioned it in his list of things he did to his motor.

Thanks for the info... What if you still have your balance shafts?

Anyone know how high Brent and Shep rev'd there 2.0's?

[JET]

I know Shep was shifting over 10k RPM, I saw his AEM log at the 2003 shootout. 8200 RPM wasn't a reason for your engine to die Brian. It may have quickened it, but it isn't the cause. 8200 RPM on a 2.0 is nothing. That is the redline I plan to run on my 2.4.

[Goat Blower]

I was just running 8500 rpms on the dyno last night, 124 miles on a 2.4, standard rod length. I've yet to see any actual data showing a regular 2.4 can't rev past a certain limit.

[Pushit2.0]

Brian you should be able to rev that motor to 9,000rpm if you want, but 8,500rpm is where I had my rev limit set to all last year.

~John