Re: Eagle SIR rods
[Re: JBurch]
#847166
11/06/10 12:08 PM
11/06/10 12:08 PM
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Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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Ive used them in mildish SB stroker motors, ran mid 11's on street tires. Shifted at 7K many times, never had a problem. They have a negative reputation but both circle track guys I know have used lots of them and not had an issue.
If you use the bushed version make sure the wrist pin is fit to the small end of the rod. (all aftermarket rods will be on the tight side)
For $80-$150 more (depending on version) you can get SCAT Ibeam rods which seem nicer and should withstand more abuse.
Last edited by Rapid340; 11/06/10 12:33 PM.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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Re: Eagle SIR rods
[Re: Rapid340]
#847167
11/06/10 01:31 PM
11/06/10 01:31 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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They have gone through many versions--first ones had crappy bolts, then a BIG batch had the bearing tang slot misplaced--Indy bought all of those and sold them right along as if nothing was the matter--then SIR got bolt only with no nuts --that is the version to get---DO NOT over torque them or you will get a Baby Rattle inside your engine--they are the lightest thing going and make a good small block rev like a chainsaw--good for mild bracket applications and anything street but Scat H beams are way better for not much more $$--I agree you MUST pinfit the bushings. I like them --and Eagle had a SALE on non bushed ones -- dealers got them for CHEAPO per set so maybe a deal on those is out there. Check them, torque with care and go to it. Small end width should also be checked at mock up--they can be too wide 
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Re: Eagle SIR rods
[Re: JBurch]
#847172
11/06/10 10:15 PM
11/06/10 10:15 PM
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Joined: Aug 2004
Posts: 1,413
Newark,Ohio
kissmyaspen
pro stock
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pro stock
Joined: Aug 2004
Posts: 1,413
Newark,Ohio
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thats what i have in my aspen running mid 12's shifting at 6000rpm. i payed 99 for them from mancini, figured they would have to be just as good as the stock onesand they have arp bolts in them. they where cheaper than what i could get mine reconed and arp bolts for. but like it says in the box not for over 500hp or 7000 rpm
79 Dodge Aspen
12.265 at 109.75 MPH
67 Satellite NSS/E
11.83 @ 110
1968 Plymouth Road Runner 472 Hemi
3 time MOPAR NATIONALS CHAMP '03 FWD and '06 & '09 Street.
'07, '10, '12 Mopar Nats runner-up Street.
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Re: Eagle SIR rods
[Re: JBurch]
#847180
11/08/10 12:50 PM
11/08/10 12:50 PM
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Joined: Apr 2010
Posts: 1,049
ohio
all spooled up
super stock
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super stock
Joined: Apr 2010
Posts: 1,049
ohio
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Quote:
I've been running these since 2008, generally shift at 6300-6500rpm; with 4.88 gears cross the line about 6900rpm in the 1/4, have hit the 7400rpm chip in the rev limiter a couple of times. I'm most interested in those of you who are leaning on them hard; how long?
I know there is a huge number of you who don't care for them and that's fine. Truth be told, ANYTHING can be broken when racing. I know I'm close to Eagle's published limits, I'm just trying to figure out how much closer I can get.
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Re: Eagle SIR rods
[Re: Canuck]
#847182
11/08/10 05:30 PM
11/08/10 05:30 PM
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Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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Keep in mind the stress on a rod increases with the square of engine speed so there is 33% more stress at 7500 RPM verses 6500.
Also, I think it is really worth the effort to stretch rod bolts to spec because torquing them rarely results in full available clamping force. A rod bolt that is not stretched enough will fail under certain use where it otherwise would not.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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Re: Eagle SIR rods
[Re: Rapid340]
#847183
11/09/10 01:15 PM
11/09/10 01:15 PM
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Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
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With the high failure rate in puny engines I would say you are asking for trouble. Funnny how they can give you an RPM range on the box, mabey they know how much inertial load they can handle in %90 of motors, they still don't know how heavy of a piston you are running and what stroke, all of those effect how much load is applied to the rod. Mabey they can handle 7000 rpm on a routine basis with a stock stroke 340 and light piston but that same rod is gonna fail a lot earlier with a heavy TRW on it at 7000RPM even if both pistons were in the same HP motor so they can not throw out a blanket statement like that. I too have seen them fail in very puny motors like a 318 with 4bbl eddy 600 carb and a 340 cam, it was a very mild motor with not many hard miles on it. For the $60 differance the SCAT is a no brainer as in, if you buy a SIR instead of the SCAT you have no brain. One look at those rods and you should get a sinking feeling in your chest about the money you just wasted, the forging quality is terrible, the forging material is no better than stock, the first ones with the bolt and nut are a worse rod than stock rods with good bolts and the newer cap screw ones are MABEY equal to a stock rod with good bolts, definately not a better rod. Mopar guys tend to under-rate the stock rods, mabey it is because of all the "pink" rod failures we hear about we just assume ours stock rods are not so good either.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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3 years now in my 408 ( one rebuild ) - no problems.
