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Re: Aluminum rod, How many runs?
[Re: Moore & Moore]
#593894
01/26/10 09:13 PM
01/26/10 09:13 PM
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Joined: May 2007
Posts: 636
Central,Ohio
FASTFISH420
mopar
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mopar
Joined: May 2007
Posts: 636
Central,Ohio
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I run GRP also and I have been told by some of the best 100 passes and out..but that is a high Hp n/a small block at 9000rpm..
1969 Barracuda 8 second all/motor small block
2014 Shelby GT500 Mustang
Uratchko Racing Engines
www.URE-RACING.com
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Re: Aluminum rod, How many runs?
[Re: BigDog68Dart]
#593895
01/26/10 09:56 PM
01/26/10 09:56 PM
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Joined: Apr 2005
Posts: 2,128
Salt Lake City
camastomcat
top fuel
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top fuel
Joined: Apr 2005
Posts: 2,128
Salt Lake City
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Quote:
Thank you all for your replies, I think I will order a new set just to be on the safe side, even though the engine is diapered, you never know what will happen and would rather error on the side of caution!  
I ran the BME's, MGP's, and GRP's. The BME's are supposed to be good for 200 run, according to BME. I know some Mopar guys in Arizona, that make around 1000 HP, and run 7800RPM, that run them 600-1000 runs. They always have. The MGP' and GRP's I have personally run 250 with no issues. After talking to Best Machine, I wish I hadn't thrown them away. they said they re-size and re-pin them, and they go for 400-500 passes before replacing them, and have for years. Those guys have been around for a while and only run big HP mopars, so I would trust what they say. That being said there's no telling when any connecting rods with fail. There is no way to test them except the size on the big and small end. Call them if you like, but like they told me, if you can afford it buy new ones. If not they will check size and fix them if needed. Hope this helps.
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Re: Aluminum rod, How many runs?
[Re: sixpakdodge]
#593897
01/27/10 02:10 AM
01/27/10 02:10 AM
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Joined: Mar 2008
Posts: 883
Affton MO
qwkmopardan
super stock
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super stock
Joined: Mar 2008
Posts: 883
Affton MO
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Quote:
There are BBC racers over on DragRaceResults with 600+ on the GRP's.
And there are many that we watch being swept up as aluminum rocks off the race track that have less than 200 runs. A freind of mine runs T/S with a 632 Chevy and changes them after 150. I think broken aluminum rods cause more oil downs than anything else. Aluminum rods are why engine diapers were invented. Aluminum is Aluminum no matter whos name is on them. Some may be slightly better than others but still aluminum.
I am not a gambler. I would only use them in a quick 16 motor and limit them to 200 or less passes. A 4 round race with 3 qualifing passes it will take a couple years to get 200 passes. If you over rev the motor take them out and scrap them before they scrap your whole motor no matter how many runs are on them.
Herb Mcandless once told me if I take them out with 300 passes to give them to him and he would run them for another 300.
Alot of different opinions on this subject. If I had a $5000 Indy Max block I would try to protect my investment and go the conservative route.
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Re: Aluminum rod, How many runs?
[Re: Big B]
#593899
01/27/10 05:02 PM
01/27/10 05:02 PM
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Joined: Apr 2005
Posts: 2,128
Salt Lake City
camastomcat
top fuel
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top fuel
Joined: Apr 2005
Posts: 2,128
Salt Lake City
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Quote:
Geez after reading this post I can't understand why anyone
Would want to run aluminum rods. Seems like a huge waste of money
Hell one guy has over 100 rods laying around!!! That's got to be
Over $10,000 worth. Could have installed twin turbos with all that wasted money
Why not just buy a set of Oliver billet steels and be done with it??
I an N/A application, I've seen more failures with steel than aluminum, and I wouldn't think you would run steel in a turbo deal with big boost? Look at what people run in 1000 HP stuff, and what holds up. I had a failure with Oliver billet rods ($1470 from Barton) they lasted 93 passes. I run GRP aluminum rods for 250 runs ($1000), no failure. That's in S/C too, and I'm not blaming the Oliver product, but less bob weight is easier on parts IMO.
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Post deleted by Defbob
[Re: camastomcat]
#593900
01/27/10 05:12 PM
01/27/10 05:12 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Re: Aluminum rod, How many runs?
[Re: hooziewhatsit]
#593903
01/27/10 07:21 PM
01/27/10 07:21 PM
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Joined: Apr 2005
Posts: 2,128
Salt Lake City
camastomcat
top fuel
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top fuel
Joined: Apr 2005
Posts: 2,128
Salt Lake City
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Quote:
Quote:
The bottom line seems to be the more cycles you flex the rod the sooner you need to change it, the killer question is how much flex is too much 
That reminds me...
Steel has a point that you can flex it to where it will not cause any degradation. Flex it over the point and it starts to weaken.
With Alumininum, ANY flexing weakens it.
IIRC that is 
There are alot of credited engine builders that use them. This arguement could go on for weeks. I've seen alot of steel hanging out of motors too. The main thing with aluminum rods would be warm up and oil temp.
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Re: Aluminum rod, How many runs?
[Re: blownzoom440]
#593905
01/27/10 08:49 PM
01/27/10 08:49 PM
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Joined: Feb 2005
Posts: 20,151
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,151
PA.
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I wouldn't run aluminum rods if you gave them to me. To many choices out there for good steel rods and all you have to do is order the rod bolt upgrade.
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: Aluminum rod, How many runs?
[Re: pittsburghracer]
#593906
01/27/10 09:31 PM
01/27/10 09:31 PM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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I wouldn't run steel rods if you gave them to me. Steel rods take all the vibration from detonation and put it into the crank. The crank is bouncing and shaking in a cast iron block. It doesn't take a rocket scientist to figure out that cast iron will crack after being beat on that much. Look at a steel rod engines main caps then look at the one running alluminum rods. Alluminum rods for me I have ran them for 15 years without ever having a rod failure. Some had over 1,000 miles on the odometer of pure drag racing.
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: Aluminum rod, How many runs?
[Re: Leon441]
#593907
01/27/10 10:14 PM
01/27/10 10:14 PM
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Joined: Apr 2005
Posts: 2,128
Salt Lake City
camastomcat
top fuel
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Joined: Apr 2005
Posts: 2,128
Salt Lake City
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Quote:
I wouldn't run steel rods if you gave them to me. Steel rods take all the vibration from detonation and put it into the crank. The crank is bouncing and shaking in a cast iron block. It doesn't take a rocket scientist to figure out that cast iron will crack after being beat on that much. Look at a steel rod engines main caps then look at the one running alluminum rods. Alluminum rods for me I have ran them for 15 years without ever having a rod failure. Some had over 1,000 miles on the odometer of pure drag racing.
Leon
Good point! Why are there so many people afraid of aluminum? They are much less hard on cranks.
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Re: Aluminum rod, How many runs?
[Re: camastomcat]
#593908
01/27/10 10:20 PM
01/27/10 10:20 PM
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Joined: Jan 2003
Posts: 19,356
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,356
Las Vegas
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Toss my name in on the side of not running steel in a race motor, particularly a stock block one. Not even for free. I have used a few different brands with no issues. I ppan on replacing mine at 150-200 passes. Only as a maintenance issue, not becuase I believe they are done, as they will go in a street motor as the old ones before them have.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Aluminum rod, How many runs?
[Re: mloboda]
#593910
01/28/10 12:31 PM
01/28/10 12:31 PM
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Joined: Apr 2005
Posts: 2,128
Salt Lake City
camastomcat
top fuel
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top fuel
Joined: Apr 2005
Posts: 2,128
Salt Lake City
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Quote:
Had 80 passes on my Groden rods before breaking one in the water box. Destroyed everything but the bare heads. Now I run Carrillo steel rods.
Had 93 passes on my Oliver rods before overheating 2 of them and killing my $1500 crankshaft. The $1470 rods fault? I don't think so, but they're junk. It the racing game.
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Re: Aluminum rod, How many runs?
[Re: camastomcat]
#593911
01/28/10 03:23 PM
01/28/10 03:23 PM
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Joined: Jul 2009
Posts: 116
Florida
mack
member
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member
Joined: Jul 2009
Posts: 116
Florida
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Had GRP's in my "small block" 396. At two hundred passes had them sized and if all OK ran another 200. Then changed them... The secret I have been told is piston to valve clearance. I ran two or three sets of rods this way with NO problems....
Mack Reeves
SST 2377
FS/D 2377
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Re: Aluminum rod, How many runs?
[Re: Big B]
#593913
01/28/10 05:39 PM
01/28/10 05:39 PM
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Joined: Apr 2005
Posts: 2,128
Salt Lake City
camastomcat
top fuel
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top fuel
Joined: Apr 2005
Posts: 2,128
Salt Lake City
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I shift at 7400, through the traps at 7800, 1034HP@7400 and 810FP@6200. And I know people that run aluminum rods on the street and strip. I don't know that I would do both, but people do as you can read on this post. And when you pull those steel rods out, better mag that crankshaft and check the size of the rods.
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