[toohighpsi]

I'd keep searching to make sure you don't have any other problem, it's pretty unlikely that you bent a rod due to output power especially at that power level. LT1 and LT4 are very similar rods and there are plenty of LT4s at 1K+ RWHP on stock rods.

Most bent rods are more likely attributed to a hydro lock or other abnormally. Not saying it's impossible, but unlikely that power bent that rod.

[KingLT1]

^Agreed.

[Kerry]

I certainly apricate the input guys. For your consideration.


Stock rods are powered metal and totally different than the lt4 rod. I have hydro locked a motor in the past. I know exactly how that works. Maybe if I was putting alot of water in with the meth but its pure meth. Maybe if it was nitro with no afr. Nitro guys run right against hydro lock. Their just is no reason it would suddenly do that.

Its running again now with gpi drop in kit so we shall see.

Like I say I get why everyone wants to believe that the stock rods are all that but once u get past 750 wheel I would say better watch out. I would say at the time it was about 800 wheel.

Gpi states they have seen stock rods with a slight bend in them before. So theirs that.

No sighs of deto on any piston at all! And this time no seizer of any bearings. In fact all bearing surfaces look perfect. The crank is useable no doubt. I will continue to use the mobil 1 15w50. Unlike when I pulled down a motor using 0w40

[Kerry]

https://gwatneyperformance.com/produ...n-rod-package/

Quote GPI,, We have found LTI connecting rods during engine upgrades on stock forced induction engines which were slightly bent even though they were still asymptomatic.

[KingLT1]

The LT1 rod is the same or similar rod to the Gen 4 LS stuff like the LS3 and are proven to 900whp.

You could be causing a hydro lock situation with your meth system? It might be coming on too early. Or oil getting into the cylinders. Or just plain bad luck...

I believe that snippet of info from GPI was taken during an interview where he basically says the rod will bend from detonation or hydraulic situation. Usually from oil getting in the cylinder.

I agree the LT4 rods are a little stouter but the LT1 rods are by no means weak.

Either way build it stronger and send it!!

[Kerry]

Already have and the motor can not hydro lock with afr 11.5 or 8. The meth replaces the gas or in this case the e85.

Seems to me hes talking about ring land and rods with a power adder. But i dont know could be just bad luck, like u say. the lt1 rebels when boost is added he says. either way I think the rods are good for a ways but, 900 crank is a lot to ask I would think.

Im a guy with all the 1.8 liter motors I have built in the past never upgraded rods. Never and everyone always asked after I won first place who built my motor and what kind of rods and pistons. when I would say stock they always accused me of lying lol

Any way its running good now and back to my belt slip problem. now the stupid belt just came completely off. I have had problems ever since i went to the ati damper with the bigger crank pully with the belt coming off and still slips.


Getting ready to throw away all these old trophy's from my racing days.

Over 35 pds of boost running pure methanol. lol fun times but expensive. Now days I keep it to 18 pump gas just have fun kinda thing.

[toohighpsi]

Originally Posted by Kerry

Stock rods are powered metal and totally different than the lt4 rod. I have hydro locked a motor in the past. I know exactly how that works. Maybe if I was putting alot of water in with the meth but its pure meth. Maybe if it was nitro with no afr. Nitro guys run right against hydro lock. Their just is no reason it would suddenly do that.

LT4 rods are powder metal too, they have some additional machining, but that's about it.

Also, I'd certainty hope you didn't hydro lock it while it's running, you'd probably have way more problems then just a bent rod.

By hydro-lock i mean fluid (fuel/water/anything) entered the combustion chamber while the engine was off and you hit the starter, doesn't even need to fire, the starter alone will bend the rod and that's normally the most common way rods are bent.

[Kerry]

Originally Posted by toohighpsi

LT4 rods are powder metal too, they have some additional machining, but that's about it.

Also, I'd certainty hope you didn't hydro lock it while it's running, you'd probably have way more problems then just a bent rod.

By hydro-lock i mean fluid (fuel/water/anything) entered the combustion chamber while the engine was off and you hit the starter, doesn't even need to fire, the starter alone will bend the rod and that's normally the most common way rods are bent.

I completely agree. This motor has never in its life been hydro locked period.

[Kerry]

Who all has an lt1 with stock rods at 900 crank??

[Kerry]

It is possible that the wisco piston failed. Hard to tell what happened first chicken or egg

[asthmamax11]

Shattered Wisco pistons ?
What the

[grampa_ss]

Try the Gates RPM belts. They're holding for me. I'm using a Griptec 3.5 pulley. Just be careful and don't over tension them.

[EDFHOBBIES]

Originally Posted by Joshinator99

Yeah 650 WHP was my self-imposed limit. Once I crept up on that I vowed to upgrade and I did. The GPI drop-in pistons and rods have taken an absolute pounding from me with no problem. The difference in construction is substantial.

did you just drop in or did you mess with balancing to be on the safe side?

[laynlo15]

Originally Posted by Kerry

It is possible that the wisco piston failed. Hard to tell what happened first chicken or egg

I've broke some motors in my 54 years of drag racing but never damaged any pistons like those. Geeez