Long rod motors?

[Shane@DBPerformance]

Steve, I only reved yours a bit past 8000 on the dyno. We had it set at 8000 most of the runs, then I bumped it up to 8200, to keep from hitting it so often. Fix the fuel and lets turn the boost up to 35psi. :)

Running a 2.4l at 8500 is like running a 2.0l at 9600. The piston speeds are very high at those RPMs. Probably a decent amount past what most V8 engine building books would consider reasonable for even a race motor. :)

Getting a DSM to make good power past 8500 RPMs anyways takes a lot more parts and work than most have. Back on my 2.0l, I think my peak power was around 7500, while on the 2.4l, peak power is around 6600.

[Pushit2.0]

By the book a 60-1 is a bad turbo for a DSM, but it sure seems to work just fine for most people. books and real world they are different, sometimes.

~John

[Shane@DBPerformance]

Yea, Isaacs didn't like over 30psi much.

[1ViciousGSX]

6 one way, half a dozen the other. ;) If you are building a "high end" engine with aftermarket rods and pistons, there really isn't that much of a cost difference. So take your pick.

[1ViciousGSX]

Off topic: Welcome back Mike.Thanks, glad to back. :D

[TrboVan]

Interesting topic.
My stock 2.2 liter mopar could only rev to about 6,250 before losing power.
Now on my new race motor I went with a long rod setup and 2.5 pistons to see if I can get it to go at least 7,000.
Hopefully someday I can make it to the track and see if it was all worth it!

-Bryan

[Shane@DBPerformance]

I would think your head or intake manifold would be the main reason for a lack of topend power on the 2.2l motor.

[TrboVan]

I would think your head or intake manifold would be the main reason for a lack of topend power on the 2.2l motor.
Head I agree,
Intake I do not. I have a hard time believing that the intake tract has anything to do with the power being made.
Show me some plots that show someone making more power due to an intake only change. (no other changes). I will even accept throttle body size.

-Bryan

[1ViciousGSX]

I would think your head or intake manifold would be the main reason for a lack of topend power on the 2.2l motor.DITTO :cool:

[1ViciousGSX]

Head I agree,
Intake I do not. I have a hard time believing that the intake tract has anything to do with the power being made.
Show me some plots that show someone making more power due to an intake only change. (no other changes). I will even accept throttle body size.

-BryanWHAT!?!?!?! :eek:

I guess that's why people do back-to-back dyno runs that show improvements after changing from a stock intake to a SMIM. Put a 2g intake on a 1g and see what happens. :rolleyes: