RODS

[BLACKBANSHEE04]

Which rod will give the most power with ported cylinders short or long rod

[fastbanshee8]

I've heard both sides of this story, long rod vs. short rod, but the long rod will make the engine more reliable. It will decrease the rod angle, making the crank and rods last longer. If you use Wiseco 795 series pistons, you will get another benefit, and that is, the wrist pins are higher on the pistons, which makes them better balanced, so they don't tend to rock in the cylinders as much. My .02 is, get the long rods for reliability, and they will also increase the torque of the engine.

[BLACKBANSHEE04]

What i was trying to figure out that i seen a 4mm long and short rod stroker crank and i seen some pistons by vitos for the standard length rod that will give u 8hp mid to top and then if i use long rods will the wiesco long pistons give me any power like the superstock stock piston from vitos

[fastbanshee8]

I just bought a +4mm stroker +5mm long rod crank, and I'm going to use the 795 series Wiseco's. From what I've been told, this set-up is great. It increases HP, depending on other mods, as to how much you will get, and the long rods help with longevity. I've only run Wiseco's in my Shee, so I don't know about the Vito's, but then again, I've read quite a bit about them, and everyone says they don't last like the Wiseco's. If you don't use the long rod pistons, then you will have to use a spacer plate, under the cylinders, and I've been told that with the spacer plate, you don't get as much HP. I would recommend the long rod crank with the 795 series pistons, for the best HP gain.

Edited December 14, 2005 by fastbanshee8

[Wallrat]

Ok I'll use the hotrods h129 crank for an example here. Its a +4 stroker, +5 longrod. The +4 is the added stroke - determined by moving the spot where the rod attaches on the crank out an extra 2mm from the center line, giving you an extra +2mm of travel in both up, and down. This is what generates more power. The +5 longrods don't do anything to increase power, all they do is decrease the stresses present on the engine thereby increasing reliability.

 

In order to run a +4 stroker, you must either run: multiple base gaskets, a spacer plate, stroker domes, or have your stock head cut to accept the 2mm that the pistons will stick out of the top of the cyls. In addition, you'll need to get porting for the added stroke to actually feel the gains. Without porting, you'll get some gain but it will be minimal.

 

In order to run a +5 longrod, you must use either 795 series pistons, or blaster pistons. This is because the port timing will be off if you don't. Blaster pistons start at a larger bore than the 795's, which you can get in stock bore. Either type of piston has the wrist pin located deeper .

Edited December 14, 2005 by Wallrat