Competition Aluminum Cummins Rods

[sbentz]

Check this out:

 

[sbentz]

Where else? Ebay:



http://cgi.ebay.com/ebaymotors/Alum...ewItemQQcategoryZ33623QQitemZ8024327632QQrdZ1

 

[JTrantham]

Wow, I want a set!!! I sure wouldn't have thought they would have been on Ebay.



Are you going to run them?

 

[Evil Otto]

well if they were made from 6AL-4V TITAIUM they might have something. when those alu rods strech you will here it. :-laf



ED

 

[justinp20012500]

are good for over 1600hp and 2800 ft-lb of torque.



How do they know they are good for that much? Did they reach that goal and have a rod fail???

 

[COMP461]

if your going to make Aluminum rods , , why so heavy!!!!



the proof rods I was looking at were around 1200 grams ,

 

[Sled Puller]

Neat item!

Would love to see video of the 1600 HP Cummins putting them to use.

 

[RacinDuallie]

Isn't this the same guy that is selling that 600hp 12valve ? ? ? Be careful what you buy.....
Anybody with a lathe-mill can machine something pretty out of a block of aluminum. Look at that pin end? I wouldn't trust em. -IMHO

 

[sbentz]

My opinions:



1. Yes, the pin eye is too thin. ( it looks too big, too???)

2. I would prefer the cap to rod interface to be larger.

3. The pocket milling looks more like a decoration than for function.

4. I would love to see the dyno run on the 1600 HP "B"... From a long ways away.



Nope, not planning on running them. Have some other short block plans, myself.

 

[RacinDuallie]

Looks like a nice paper weight though... ...

 

[2broke2smoke]

on the bottom picture does right side area where the cap connects on the aluminum rod look thinner than the factory rod?

 

[SRadke]

A talanted guy with a CNC machine and a billet of 7075 could make a set of those in a few hours. Where does he get $1600? And how do you keep from spinning the bearings out of them?



-Scott

 

[Hohn]

A talanted guy with a CNC machine and a billet of 7075 could make a set of those in a few hours. Where does he get $1600? And how do you keep from spinning the bearings out of them?

-Scott

No doubt.

I'm no pro, but they look like eye candy and that's it. I'd NEVER consider running them in an actual engine.

The small end is way too thin. AL has to be thicker than steel to make up for the lower tensile strength (i. e. , it hits the point of yield sooner on a stress/strain chart).

NOt to mention the inferior fatigue strength of AL especially in a stressed application like rods.

I agree that the 6AL4v would be a much better choice. Lighter, stronger, and the best fatigue life imaginable.


The only aluminum rod I'd ever consider running on the street is a BME rod in a gasser. IF BME built a Cummins rod, I'd guarantee you it would be about 4 times beefier than the rod that's pictured.


The biggest question I'd have is WHY? Why do an AL Cummins rod? Why not go for lighter crank and pistons first? I'd think that the 5. 9 is a prime candidate for a shorter piston and longer rod (lighter pistons, better rod ratio).

Heck, I posted earlier how one could get the rod ratio on the 5. 9 up to a better 1. 75 or 1. 8 with only a modest de-stroke and a shorter, yet still stable piston.

At least, that's my theory. Someone go prove me wrong.

jh

 

[GIT-R-DONE]

Maybe we all should send him 50 questions about his product and see what/how many different answers we get... :-laf

 

[JDailey]

If you want to see a 1600hp B dyno run, just take a trip to beautiful Vallonia,IN. But I doubt you'll see any those particular rods there!

 

[RailroadJim]

Quote by Hohn " need more cowbell!" man i busted a gut when i read that, that was the funniest snl skit ever, thanks. Now back to the discussion at hand.

 

[COMP461]

No doubt.



I'm no pro, but they look like eye candy and that's it. I'd NEVER consider running them in an actual engine.



The small end is way too thin. AL has to be thicker than steel to make up for the lower tensile strength (i. e. , it hits the point of yield sooner on a stress/strain chart).



NOt to mention the inferior fatigue strength of AL especially in a stressed application like rods.



I agree that the 6AL4v would be a much better choice. Lighter, stronger, and the best fatigue life imaginable. jh

Titanium is not lighter the aluminum. Aluminum weights 36 % of steel, and titanimun weights 61 %

I’ve run both rods in Pro Mod motor, and the only reason ti is used is it last longer. It’s about the same weight rod for rod, in that you have a lot less material. In a Pro Stock, or comp motor you change the rods every 40 to 50 runs, with Ti you can go about 200 runs . We use Ti in valve springs also, they maintain their seat pressure right up till the point that they break. I



Aluminum rods will work in a diesel , and there a few sets in tractor pullers now , but there is no strength problem , because a diesel never even gets close to the torque that a fuel motor makes , try 6000 ft pounds . And the fuel rods are the same forgings as the ones I have been working with.



Another reason is if you can cut reciprocation weight by over half , the gains in acceleration hp would be great.

 

[4xquadrod]

Maybe we all should send him 50 questions about his product and see what/how many different answers we get... :-laf

:-laf Yea, there you go, that could be fun reading!

 

[DieselTweaker]

your right,,, nice paper weight ill take one for my toolbox!

 

[Hohn]

Thanks for clearing that up, Comp. Always learning!