Has anyone actually busted a rod in the EJ25? I've heard of putting holes in pistons, but never a rod failing before a piston.

My pistons failed, but the rods seem to be fine. I am replacing both though for peace of mind. Since the block is open might as well beef it up further. I would hate to see a rod sticking out of the block. ;)

Aaron
http://www.scoobymods.com

So nobody has broken a rod?

I think adam99rs broke one on his 99 EJ25 but he was also running the fastest Turbo kit to be on a EJ25 too.

Ok, but did the rod just go, or did the whole motor go after the pistons were destroyed?

I think just the rod. You would be better off asking him youself. I dont remember.

Adams car posted the fastest time it ever had, then promptly ate itself on the drive home. I don't have all the details, but it seems that a rod probably bent on one of the runs, then on the drive home the imbalance finally took it's toll. Knock, knock, knock. That led to a hole through the block, etc.

Seems that the stock internals aren't going to like running at 350+hp. Damn Subaru! ;)

Steve
http://www.forcefed4.com

Posted by Jay UK:

Hi there,

There are several makes to chose from:

Pistons:
JE
Cosworth
Omega
Arai (ewww)

Rods:
Crower
PAR
Farndon (yummy)
Arrow (yummy)

J.

What kind of engine management was Adam using?

Adam was running the piggy-back-hodge-podge of S-AFC, ITC, RRFPR, J&S, and maybe a couple of other things. He wasn't running additional injectors (although he may have not been using stock injectors) nor was he running some type of aftermarket engine management system. I recall that the car ran a 12.68 or so.

Adams a great guy. I'm sure if you email him he'll answer your questions. His username here is adam99rs. Beware his touch typing skills! ;)

Steve
http://www.forcefed4.com

I have seen Adam's old motor. he dent the rod of the piston and it shot through the side of the motor. I saw it while he was builing my car. he was ruuning a Bell engineering fuel pump, S-AFC, ITC, HKS EVC4 and Supra TT fuel pump. He was using stock injectors and fuel rail. The only advantage he had over stock RS was the Japan RA tranny in his car which reved higher.

thanks,
Greg

i just melted a head, pistons and rods were fine.

my car is currently at cobb being built, he informed me that in the case of stock internals you will almost certianly melt a piston before you destroy a rod, however once you have stronger pistons it is possible to destroy a stock rod, particurally while running high boost at low rpm ranges, like flooring it at 50 mph in 5th and reaching 11 psi, the rods just can't take that kind of treatment.

just for reference i'm getting crower rods put in just be safe.

my best time was 12.989 at 107, run at great lake dragaway, car was declared legally dead about 4 weeks later. i was running basically a minnam kit, 9 psi, enlarged stock injectors done by a local diesl truck place called fuel systems up here in milwaukee wisconsin, holly 255 lph high pres pump, vortec press riser, J&S, and a filed hyper R fule controler, hks ecv 4 boost controler.

jon
awating the return of the money pit

like flooring it at 50 mph in 5th and reaching 11 psi, the rods just can't take that kind of treatment.

what about flooring it all the way through the gears like in a drag race? did he mention if it would take that punishment?

did you choose the crower rods or did Trey recommend them? or was it all they had?
and what pistons did you get? how much boost will you be running?

my other posts...
here (http://www.i-club.com/forums/showthread.php?threadid=67132)
and here (http://www.i-club.com/forums/showthread.php?postid=633176#post633176)

In jon's example the rods are suffering due to a phenomenon known as thrust. There's a very heavy load on the motor when you're at 50mph in 5th-- for an RS that's 2000rpm, a bad time to mash the gas. You can either use part-throttle or downshift, either saves the rods. Due to the lower load, that same car would have no problem accelerating hard from 2000rpm in a lower gear, say 2nd.

I'm don't have time or the skill with words to properly describe it, so I'll leave it at that. If you are drag racing the engine will always be in the proper gear unless you short shift, so this situation shouldn't happen.

I had always believed that if you could get the pistons to survive to 350hp, the rods were almost certainly prone to failure. Most people blow up pistons because of too much timing/not enough fuel, but if you have all that, like in Adam's car, then the next weak point will probably be the rods. (although we all secretly know its the tranny :D)

-Danny

nice little BUMP!:D