81mouse is right on. For most setups, it makes no difference. If you are building an all out, high rev racing motor then a long rod is better. Otherwise, don't sweat it.

Rich Krause

 

i see you're point mr. smartie pants, my mistake. i think that i would go w/ a similar setup w/ a 1320 car on a power glide. however, he made no mention to what setup he was running.


formula? it's kinda comomon sense, but "optimum" hinges on the combo. as you mentioned the bbc works well w/ shorter rods simply because of the way the motor has been done to compensate for the 2 speed, lower gears, ect...

as i mentioned, a diffrent combo requires all factors to be taken into account, say our boy w/ the 377 stroker, probably be a street car and wont see 80% of the max pistion speed on the street, but lets say he runs it at the track on the weekends w/ nitrous. if it was me i'd go w/ the 5.7 rod verses the 5.85 or the 6.0 or bigger. the 5.7 nets him a 1.52 Ratio and will premote better cyllinder filling on the bottle. not that this will make much diffrence alone but every little bit helps. im not arguing the rod length dabate here, i think it was merely my un-edjumicated response about pistion acceleration that started all this. would you agree Mr Mindgame?

 

i dont want a 8500 rpm v8 i am staying aroung 6500 but the pistons i am getting from JE said to use a 6.0 rod with a 3.750 stroke and 700cc heads to get a CR of 10.3:1


so it doesnt matter if i get a 5.7 or 6.0in rod for a 6500rpm engine


butif je says to use a 6.0 with that piston should i

 

Yes, you have to use a 6.0" rod with it if you want any compression.

So go with the 6.0" rod.

That's all i'm gonna say before being called Mr Smartie Pants.

Bret

 

lol.. sarcasam is tough to carch over the net.