i have never heard of a rod twisting due to detonation,where did you get this information.i am asking because i am always wanting to learn.

thats some funny chit right their!

I have to ask... How many AA's does your toy take. That thing has gotta take a lot if it's spinning 10,600 rpm's. No really who's heads are on that thing that will support that many rpm.

Are you going to substantiate this claim? I don't see how a rod with its symmetrical shape would ever impart a twisting motion in tension or compression.

When you detonate the piss out of the motor the piston will want to rotate in the bore. The I-beam design is alot stronger as far as twisting goes. I think I still have some pics in my old phone of a set of rods that came out of a nitrous motor with a bad tune up. This is not a big mystery to nitrous builders.

I never heard of twisting myself, not to say it cannot happen, but never once heard that...

A little before your time.......look up Chubby Checker.

lol

Cool. I'd like to see pics of those twisted rods.

Just my 2 cents butt most of the time when a Rod fails.... something else has happened first (spun bearing) oiling issue "something" its not to often they just break , not saying they can't or won't break but rarely.... I was IHRA Record Holder in 84 and 85 in A-Gas 468 bbc with tin-dipped chevy rods 8600 rpms never a problem. I know thats different from boat engines but as others have said.... tune up.. Clearences when built etc etc will blow one up quickly.

Exactly! I tossed a rod in August, spun bearing.....

I-beams , L19's and 10W20.....never woulda happened . lol In your case it was probably caused by the crank smacking the piston skirts no .

Ya think? or maybe this????[ATTACH=CONFIG]534061[/ATTACH]

Ouch.....

hack engine building 101.....he used p series bearing and made his own chamfer.....caused heat and made me spin bearing, hes lucky my buddy paid him when he had the engines and not me, I woulda been making a road trip..... BEWARE Neal Vance Racing in West Virginia....

Yow , why the hell do guys do chit like that . Just used what he had laying around I guess and just didn't care .

Amazes me... I am not re-using any of it in my new builds, all new even blocks...cranks were even hitting bottom of pistons!!! how do you not feel or see that when ASSEMBLING?

But I didnt twist a rod!!! LOL

[ATTACH=CONFIG]534062[/ATTACH][ATTACH=CONFIG]534063[/ATTACH]

Holy fack , looks like Randy's janitor's stepkid built that engine . Turned over nice and free by hand after assembly I bet .

lol

hard to believe anyone would do such a hack job.engine assembly is not for everybody!

How long did that engine run before it spun the bearing?

What the ''f'' you talking about How many AA's,,ill give you a hint,,its on top of my rifel and its a lazer and sited for 300 yards,,thats the only thing i have that takes AA's..as for the toy that winds up to 10600 is my snowmobile,,its a yamaha 4 stroke and its a 4 cylinder 20 valves 5 per cylinder 998 cc's. before boost it puts out 150 ponys,,in boost it puts out 230 ponys..anything else you would like to know?

Amazing huh? My buddy paid 26,000.00 for that

About 12 hours, there were many issues I had to fix even when I forst got them (oil pressure was low, no inconel valves) ran good somehow until she spit a rod

Relax man I was just messing with you. I thought u had a hillbilly mountain motor. That's a little rice burner.

Sorry guys I can find my old phone withe the twisted rod pics. The motor twisted three out of 8 rods I think they were Carrillo. I seen them in my buddies shop and was amazed by it cause I had never seen anything like it so I took some pictures. He said nitrous motors do this sort of thing all the time when you miss a tune-up. It all really depends who you are hanging around as to what you are gonna see. I was always into blower stuff and used to seeing broken cranks rods windowed blocks that sort of thing. Then I started hanging with a guy that builds nitrous motors and started seeing a lot more melted Pistons, heads without combustion chambers and so on.

Full force when you rebuild ...are you going to set it up for 10W30 oil? I hear its the best!! :D

What brand?

5-20!!!! for sure!

5W20 Superflo!!!

You'd think it would just bust the wrist pin out of the skirt as opposed to twisting the rod. This is the only way I've seen them "twisted". Pics would be cool!

it is bent but is it twisted?i have seen that in a hydraulic lock .

The thickest part of a H beam rod is directly below the pin

The thickest part of a I beam rod is to the sides of the pin, potentially allowing the force to split the rod like a banna peal.

Some brands have stronger I beam designs, but makes you wonder why they use an H beam design on thier less expensive rods?? Maybe because the H beam design is stronger thus helping keep the cost down.....

Also some prefer I beam because they have more potential to be "saved" if damage occurs. Where any little ding you should replace the H beam.

thats the only way I ever seen them, "bent"

My machinist said the H beam is normally stronger also, he uses either depending on customer wants... but did tell me the same thing if they get any imperfection in them it can fail, but like he said... if that is happening you got issues anyway lol

No, it is bent due to hydrolocking. That is why I said twisted in quotes. Would love to see the pics where they are turned like a barber pole.

so would I.i have seen the scrap metal detonation can produce but i have never seen a twisted rod,that is a new on on me.i guess anything is possible.

Me too, but I can't fathom that happening. No twist can be imparted from the big end, and I really don't see any twist from the piston end (thought it may freely do so). Last thing up would be rod's section, but it is symmetrical about X and Y when viewed axially (normal to the primary forces of regular operation).

Maybe he means "twist" as in "bent" not sure... I never seen a rod like a barber pole pic would show us...

i don,t think he means bent because he stated that detonation causes the piston to TWIST.back in my racing days i met a lot of nitrous guys who would push it past the limit.serious detonation can ruin an engine in less than a second.one time a guy took the head off and it and what was left of the piston looked like someone was in there with a torch but no TWISTED rod.