H-beam or I-beam connecting rods?

[Bugman]

Which of the two is stronger, and by how much? I'm looking for rods to put in a blown Hemi making about 800 HP. I-beams are usually cheaper than the H-beams are. Which do you prefer and why? Thanks.

-Jeff

[old beet]

Talk to FEDER, he can xplain, hes buildin one for his 49 Merc........OLDBEET

[jub]

H-beams are stronger, more meat in the areas that need it.

[Unkl Ian]

H beams are stronger.
Get Carillos.

[Thirdyfivepickup]

I agree... Carillo makes a mighty fine rod.

Don't overlook: Manley, Lunati, or Oliver.

Overlook Eagle.

[AHotRod]

Blown Hemi's run aluminum rods boys.

[Bugman]

Thanks for the opinions so far. I've got aluminum rods already. I don't trust'em on the street. Carillo's are a tad out of my price range, otherwise I'd use'em. Is everyone comfortable with Manley's? Any bad experiences with'em? Thanks.

-Jeff

[Roadsters.com]

If you want good advice from people, you might make it easier for them and tell them if you're talking about an early or late Hemi, what this engine is going in, what you're going to use it for, and the highest rpm it will ever spin.

Dave
http://www.roadsters.com/

[Bugman]

Good point Dave. 392 Hemi street motor. Blown, moderate boost(5-8 psi, more if I don't go fast enough). Going in a daily driven '55 Plymouth, will see some track time though with the very occasional 6000 RPM, and I'm going abuse it with the loud pedal any tima a ricer wants to play stoplight tag. Backed by a TH400 and a 9" Ford with aproximatly 3.00 gears. Have a nice day http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

-Jeff

[Johnbegood]

Good point Dave. 392 Hemi street motor. Blown, moderate boost(5-8 psi, more if I don't go fast enough). Going in a daily driven '55 Plymouth, will see some track time though with the very occasional 6000 RPM, and I'm going abuse it with the loud pedal any tima a ricer wants to play stoplight tag. Backed by a TH400 and a 9" Ford with aproximatly 3.00 gears. Have a nice day http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

-Jeff Hot Heads and K1 technologies make h beam rods! The k1s are new to the market and are cheaper than hot heads by several hundred bucks-I am looking into those rods for my blown 392 also!!!

[squirrel]

a 6000 rpm blown street motor doesn't need strong rods....

(yes, I have a stock rod 6000 rpm blown street motor with a bunch of miles on it)

[squirrel]

and before you guys start giving me a bunch of crap....it does need the rods properly prepared (mag'd, sized, new good bolts, balanced, etc) but at moderate rpm like that there isn't that much force trying to pull the big end apart. Boost adds some compressive load, which isn't a problem.

and 8 psi on a 6000 rpm 392 ain't gonna make 800 hp on gasoline

[Bugman]

and 8 psi on a 6000 rpm 392 ain't gonna make 800 hp on gasoline
As usual, you're right. Since I first posted this, I've refined my "vision" of the car. My current goals are 175 MPH on the salt, and 11.5 in the 1/4 with only a gear swap. I know a bit more than I did back then, and RPMs don't scare me like they used to. It'll still be street driven as my Driver, but it'll see 7,000 RPM semi-regularly, it may see the high side of 7,500 from time to time. "Street" boost probably won't be as high as "race" boost, and knowing me, I'll push the boost until I reach my goal (just ask my currently blowed up supercharged Beetle:rolleyes: ). no point in setting goals if they're easy to reach, right? :)

[squirrel]

heh...I didn't even notice the dates! sorry bout that...I guess you stumped me

[Bugman]

Haha...I dunno, you did have the right answer, just a bit late :D I forgot I'd even asked the question. I got sidelined with so much stuff, the Hemi is on hiatus until further notice. Thats not all bad though, it gives me a chance to think and learn and plan. If I'dbeen able tofinish it when I first started, I would have been dissapointed by it's performance(of lack there of).

[Flat Ernie]

H-beam rods are made that way because they can fit more meat into a smaller package. But the stresses a rod sees mean an I-beam of the same size would be stronger. That's why factory rods are almost all I-beam - they can use less metal for a given strength.

All that really matters for less than all-out engines is whatever you can fit within your package & what is available.