Right now i will be on a very tight budget. anyways i was looking at some connecting rods and tr has a set of eagle cr's on there for 300 dollars.

anyone here have any experance with eagle connecting rods? Anything better than stock right.

anyone know of a good deal anywhere else even?

 

Nothing wrong with the stock rods.

Rich

 

sorry i need to give more info
355 block
sealed power forged pistons

gm847 cam

fully ported heads, all bolt ons,

plus 200+ shot of nitrous

 

Would not suprize me at all for stock rods to hold that, people don't give the stock stuff near enough credit.

 

well, thats what I have in my 383. eagle hbeam 3d rod. have yet to spray it, but I built it w/the same intentions. to easily hold 200HP shot. what rod is it that you found for $300? Ibeam rod? Ive seen the Hbeam rods go for around $340 new on Ebay, but never cheaper then that. and usually more like $400 set. I have a set of Hbeam rods I'll sell ya for $300 plus shipping. new in box. 5.7 hbeam eagle 4340. I talked to a few diff. eng. builders about this exactly and I couldnt get any of them to say they thought the Ibeam 5140 rods would suffice. so I went w/the Hbeam 4340's. Scat are very comparable (if not the same damn thing, they sure look the same)oh yeah, I decided to go 6.0" rods after commiting to buying these rods. thats why I have them. If I dont sell them, I'll just use them on my Iroc eng. when I rebuild it next.
chris

 

Rods usually fail in tension, not compression. IOW, the failure is related to rpm and piston weight, not hp level per se. But that combo should make 600+hp, probably too much for the stock rods. However, you might get away with it for a while. I am not familiar with the $300 rod you are referring to to say it would be any better or not than the stockers.

Rich

 

Eagle Specialty Products Lightweight I-Beam "SIR" Rods, 5140 Steel, SBC 5.700" length, 565 grams, Rated to 500 horsepower (press fit)
$299.99



Eagle Specialty Products Lightweight I-Beam "SIR" Rods, 5140 Steel, SBC 5.700" length, 570 grams, Rated to 500 horsepower (bushed)

 

yeah thats what I thought. I found a site that had themn for $260 that had the 7/16" capscrews. but I decided I wanted to make SURE I had enought rod strength. anyways let me knw if your interested. still in the box, individually wrapped in plastic. I also have a new ARP head stud set w/12point nuts. NIB also.

chris

 

your better off getting an h-beam. Those eagle h-beams for 300 is a steal. I would get those. Another thing related with rod failure is the rod bolts. ARP L-19 rod bolts support 1000 hp. The eagle h-beam rods are good for over 700 hp.

 

Check Ebay. I would highly recommend cnc-motorsports or gofaststuff.com for Sir I Beam Rods. I just purchased those rods and I paid a heck of a lot less than 300. And yes, they are brand new. Just shop around. Ebay is your friend.

I have the exact same setup as you do except I am going with a 150 shot of the laughing gas.

And I still need to purchase the heads.

The Sir I Beams should work just fine.

Also, since you are going with the Speed Pro kit he can only purchase pressed fit due to the pistons. If you have the cash get the H-beams. I just didnt have another $100-150 more for those rods.

 

Scat has a 4340 I beam with 7/16 capscrews which is only a touch more from cnc motorsports. I would opt for it anyday over the eagle SIR for the price. Either way, you are really pushing the limits of a low end I beam IMO with a 200 shot higher rpm motor

 

500rwhp should take you into 10's. If you are building something that insane then I would defiantly go towards different rods.

I am only planning on 400 ish HP so I purchased the Sir I Beams accordingly for my setup. It's not necessarily the HP/TQ that breaks the pistons/rods, more the RPM's. And since you have a GM847 like me I imagine you will be spinning around the 6500 range. So in hinsight, yes if you have the money purchase better rods. But the Sir I beams dont get as much credit as they should IMO.

 

The 4340 Forged Scat I beam is more than enough rod for what you are talking about here. As Rich said, piston weigth is much more of an issue than rod strength.
Couple that with another wise old man Joe Sherman......

"guys come into my dyno with billet cranks, $1200 rods and put down 450hp at 7000rpm complete waste of money."

and one more thing......

"I've run stock rods for 40 years now to 8,000rpm and NEVER had a rod break, those Scat rods are cheap enough to not even bother fixing stock rods and they are even stronger"

Bret

 

i try to push the motor build back about aqnother month and buy h beams


also will a stock 350 rod work in ours or do they need to be lt1 rods


ive heard 2 diffrent storys

 

same rods.