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9 sec TA · 02-17-2005, 06:52 PM

has anyone had a problem with GRP aluminum rods, I broke one last sat nite running brackets at moroso, only 73 pass on motor, all the bearings look like I just put them in. broke the block, bent the cam, crank looks good need to mag it. the rods were 6.800 long have a 9.27 small end, and a 2.375 big end. called grp they said send everything and will get back to you.

9 sec TA · 02-17-2005, 06:52 PM

has anyone had a problem with GRP aluminum rods, I broke one last sat nite running brackets at moroso, only 73 pass on motor, all the bearings look like I just put them in. broke the block, bent the cam, crank looks good need to mag it. the rods were 6.800 long have a 9.27 small end, and a 2.375 big end. called grp they said send everything and will get back to you.

74t/a · 02-17-2005, 07:48 PM

Yes....I have seen GRP rods break.....I build BBC nitrous engines and they are the only ones I have had experience with the GRP rods in. I don't use them, I use the BME rods myself.

455-4+1 · 02-17-2005, 07:59 PM

I crew on a low 7 second A/dragster here in NZ
500 inch BBC with big cheif heads etc.

Runs 9000 rpm through the traps

Broke a GRP rod at the end of the burnout 2 runs after motor was freshened. About 25 runs on the rods.

Rod bolt "pulled out" of the main body. Still had bits of aluminium on the threads.

How did your rods fail ????

Do you have any pictures ???

Half-Inch Stud · 02-18-2005, 06:02 AM

Good Question:"""How did your rods fail ????"""

Such as " When I rev'd it up then snapped the throttle shut." or "while crossing the big end".

HIS

9 sec TA · 02-18-2005, 05:58 PM

after cleaning them up in the wash tank, I notcied that the rod caps were cracked next to the bolt. I called grp spoke to brain, told him i really dont need to send them back to you, i know whats wrong them, he said that happenes sometimes, and they are working on making them better. he offered me a set for $400.00 to make me feel better. i told him it took out my block,cam,bent2valves,maybe the crank also? and a pair of roller lifters. thanks guys

tempest455 · 02-18-2005, 06:03 PM

That sucks, I know how you feel! You only broke one? How does the one next to it look???

Brinson Pachar · 02-18-2005, 06:09 PM

Which serie GRP rods were you running?

Half-Inch Stud · 02-19-2005, 07:25 PM

...the cracked-cap series?

9 sec TA · 02-21-2005, 10:30 PM

the rod series are 5000. after speaking to MICHAEL GIANNONE from MGP i know whos rods ill be running from now on. allmost everyone in nhra pro stock is now useing his rods, with no problems and alcohol funny car too. he knows about the rod problems cracking, his rods dont crack, break, or fly apart. thanks everyone

torqjunki · 02-21-2005, 10:42 PM

Good friend here in Houston built a street strip motor with a brand new set of GRP's. The car ran mid 11's before and after the high dollar bottom end. With only a hand full of passes and very little street driving (50mi), he started getting water in the oil and pulled the motor to inspect. No bearing damage from the water but found cracked rod where the threads are.

Steve Barcak · 02-22-2005, 09:59 AM

I have been following this thread with some concern. I am assisting a friend who is having Butler Performance build a very high dollar blown alky motor for him. I am building the competition supercharger drive, cam driven pump drive and handling the injection.
This motor is being built with GRP rods. I have contact them with my concerns and they have assured me they are very comfortable with GRPs. Is it possible you guys or your friends either assembled the motor wrong or, perhaps, used the wrong series of rod for your application? I use the very pricey Childs& Albert Deep Cycle rods and they have held up very well in my fueler.
Comments?
Steve www.pontiacheaven.org

jack gaydosh · 02-22-2005, 10:27 AM

9secondT/A I have run MGP rods for three years now problem free. engine had over 300 passes on the rods. just orderd another set for my new engine. Great set of rods and I won't use any other rod in my engine thanks jack

Steve Barcak · 02-22-2005, 12:43 PM

Jack,
You state you run "MGP" rods with sucess. Is that a typo or another brand, please verify. thanks, Steve Barcak www.pontiacheaven.org

Fast Floridian · 02-22-2005, 02:18 PM

I would be careful to make sure someone who is a reputable builder assembles your next motor. LOL

Gaby · 02-22-2005, 05:23 PM

Fast Floridian, I agree

He needs a good engine builder! Just kidding Charlie, keep up the good work. I use MGP for four years, never had one problem in all applications used. Good luck.

Scott Rex · 02-22-2005, 06:06 PM

I've used GRP rods in several of my own motors. I use the 5000 series rod, never have had any problems.
Bruce Maichle (5000 series)and John Langer (2100 series)both use GRP rods without problems.

jack gaydosh · 02-22-2005, 07:06 PM

Steve no typo MGP michael giannone products. great stuff thanks jack

Brinson Pachar · 02-22-2005, 08:39 PM

We are installing a new set of GRP 5300 series rods in our motor now. Our old rods were Childs and Albert Deep Cycle and found one cracked in the threaded hole for the cap screws. I was told that MGP and GRP used to be the same people and decided to go seperate ways.

Rob · 02-23-2005, 07:14 AM

I wouldn't go so far as to say GRP rods are bad, but when Giannone Racing Proucts loses the Michael Giannone founder and employee and builds his aluminum rod company now called "MGP" moving from Colorado to Denver and virtually every Pro-Stock and Alcohol drag racer follows along with the move that tells you something. GRP is cool name bet that gives them about three more years of sales before they give up and die.

9 Sec TA little engine builder in FL...he cracks the story(pun intended) and we find another small engine builder/racer Jack Gaydosh & Spotts Performance have been in "the know" for several years.

-Rob

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