so as like many people I have decided to go the 2.4l route, I have been doing my research and have been told the standard rod legnth(150mm) will produce more torque, which is what im after. And the longer rod will produce more power up top and reduce reciprocating mass. But if i understand correctly that comes with its down sides as well, weakening the piston skirt, since the pin has to be moved up 6mm?(i may be way off?)

Aaron( and others) i know youve answered alot of my questions, what is your take on this? Anybody have experience with this. Everyone seems to be doing the LR, but i dont plan on running anything bigger than my fp blk, its pretty much 99% a street car.....and that turbo doesnt do anything at 9k rpm so its pointless.

 

A shorter rod will not make more torque. Thats a bit absurd.

 

LoL.

2.4 FTW!! I have around 510 miles on mine so far, loving it.

 

+11

i love the 2.4L i should of done it sooner. 35r 2.4L = fun!

 

im glad you guys are enjoying your builds, but the 150mm/156 debate came from a well known vendor. the whole tq thing was news to me.......

 

so can someone chime in on all the pros of going with the longer rod as opossed to the regular length? cons if any as well?

 

BR does 2.4's now?

 

You will gain i believe around 3-500 rpm with the long rod.
Search for posts by John Bradley, as that is Aaron from ER. There are posts everywhere about this topic. I just wish they could all be saved and combined! lol

 

Short rod vs long rod....


This has been debated not only here but throughout the whole of the internet since Hector was a pup. I am going to condense 20 years of this argument into one or two sentences though and try to get the tech across.

"Rod ratio is a handy tool to make your cylinder head do what you want it to do when the ports are lacking. Second is the reduction of cylinder sideloading at high rpm."

JohnnyTSI's short rod motor makes less torque than BlackCarbonEvo's Long rod down low. Why? The only thing I can think of is Johnny doesnt have a dump since its not what that car is about. Fast and quiet is more deadly to the unsuspecting. I have seen Honda tests that showed short rods making more power but again thats relative to when the port achieves peak velocity overlapping with powerband from the cams.

In short, it's debatable. I prefer long rod motors because I like larger turbos and still need to be able to rev the motor out and not worry about it. My tranny (most Evos) doesnt like to shift as fast as I want it to past 9k, so 8600-8700 is perfect. I have the ability to rev it out and make good torque with good spool.

aaron