Sitin here waiting for the tow truck

[WARREN]

When we did the cam in my v they talked me into valve upgrades specifically the trunions and head bolts being we where going to run more boost. The valve components on the LT motors are ok for stock..but a weak link once you start throwing some power in them.

When I built my 6.0 for the Monte, I put the Ls9 head gaskets, head studs,beehive springs and the rocker arm trunion upgrade.
The engine wound up in a malibu and never heard that it didn't perform.

 

[Snail]

Which ever of you get closest to the correct diagnosis will win a prize. I'll mail you an autographed broken part.

 

[gsxrian]

Says the guy with the turbo grom lol

I don't have a Grom, or Turbo anything .... i think you have me confused with someone else.

 

[Snail]

My gsxr made 340 h.p., took it to bonneville, set records and blew it up running grudge for money.

 

[jhinderliter]

I don't have a Grom, or Turbo anything .... i think you have me confused with someone else.

I guess I do , similar name from Florida I think ..

 

[zxfan]

You were thinking of GSX. No turbo on that Grom just 100% badass naturally aspirated.

 

[zxfan]

I think Hugh G Erection is right on the money. Ring gap closed up under wfo and pistons decided they didn't want to go up and down anymore.

 

[Snail]

Zx, im leaning toward that as well. Every other bloen up engine that ive experienced degraded, causing heat, steam, bad noises and loss of power. This was instant.

Its bad timing, Tim is trying to clear his work schedule before boat race season. We'll do a tear down, mothball the remains, and fix it june.

 

[rumble phish]

That sucks bro, sorry to hear.



On the bright side (for me anyway), the MONYPYT is still running like a top. Over a year and 12k + miles (and still under warranty).

 

[Vegas12]

If the motor in question was 8 years old, am I reading it correctly that it had cast pistons prior to last year??

Inside the CT525 Crate Engine Enhanced with Forged Pistons

www.theblock.com

 

[Snail]

Vegas, I dont know what was inside the engine, the 8 yrs. storage time frame is just an estimate. I'll have some answers mid week.

 

[Snail]

Vegas, thanks for the link. Very interesting. If we can pound the seized piston(s) out of the block, maybe sble to save the bottom. Maybe. That article certainly backs up Hughes opinion.

 

[Snail]

Ill be sure the replacement engine will have the upgrades. Again thanks to all.

 

[LE05BUSA]

Bore the one you have and put forged pistons in it with the rings gapped proper.

 

[RZ350]

I will guess that an upper ring grabbed the bore and broke off a ring land....

Those engines only had .012 ring gap and .005" piston to bore clearance stock, and they needed upgraded valve springs for boosted applications.

Pull it apart and see what the damage is, may be some good parts left...

 

[bowtie]

you bought a motor without knowing what parts were inside?

 

[Snail]

Yes. Like most shit i buy i have to break it and take it apart to understand it. Im a slow learner but im not a quitter!

 

[jhinderliter]

you bought a motor without knowing what parts were inside?

engine ...

 

[bowtie]

 

[Hugh G. Rection]

Nitrous taught me everything I needed to know aboot ring gap.

 

[Master-Cylinder]

I will guess that an upper ring grabbed the bore and broke off a ring land....

Those engines only had .012 ring gap and .005" piston to bore clearance stock, and they needed upgraded valve springs for boosted applications.

Pull it apart and see what the damage is, may be some good parts left...

Some of the Honda ATV's have a piston clearance of .01mm, that's slightly less than .0004 farmers inch. I believe I read a F1 car has even less clearance. The coolant and oil have to be heated before you can even start one.

 

[RZ350]

Some of the Honda ATV's have a piston clearance of .01mm, that's slightly less than .0004 farmers inch. I believe I read a F1 car has even less clearance. The coolant and oil have to be heated before you can even start one.

Yeah, and that's just crazy for a crate engine....................................

 

[RZ350]

.... crap, my last 1109 Kawasaki ended up at .0038" p/w clearance, I warmed it up always, zero issuses.....

 

[RZ350]

Forged pistons...

 

[Hugh G. Rection]

Heat cycled?

 

[Terry_Schiavo]

Heat cycled?

heat shattered

 

[Snail]

I warmed the engine to full operating temp, and drove it ten miles easy before stood on it. All systems were good prior to a full power burn.

I wished I'd cleared the data logger (Dakota Digital) prior to the attempt, hoping Tim can extract some data with his lap top.

 

[braindead_organdonor]

It spun a bearing is my guess.

 

[Snail]

O.k., Hugh is betting on piston failure.
Wretch has valve failure.
Brain has spun bearing.

Tim is tearing it down, and will know who was right. He's pretty sure Hugh or Wretch is on it, but not sure.

Meantime I'm ordering a new improved version of the CT from Summit Racing, with thanks to Vegas for the informative link.

 

[Mr Lucky]

Gonna need pics, skipper.

He's not your Skipper. You can't call him that...

 

[hagrid]

He's not your Skipper. You can't call him that...

Pipe down or I'll send you a GIF of a rolling sea and make you spontaneously vomit.

 

[Mr Lucky]

Pipe down or I'll send you a GIF of a rolling sea and make you spontaneously vomit.

You aren't allowed to use nautical terms either...

 

[gsxrian]

O.k., Hugh is betting on piston failure.
Wretch has valve failure.
Brain has spun bearing.

Tim is tearing it down, and will know who was right. He's pretty sure Hugh or Wretch is on it, but not sure.

Meantime I'm ordering a new improved version of the CT from Summit Racing, with thanks to Vegas for the informative link.

I'm betting on ring failure, leading to piston failure.

 

[BIggerDanno]

Sorry Paul!
I think it went lean. WOT pull in top gear is hard on an engine and if tuned lean will rear it's ugly head.
If not lean then spit a valve retainer.

 

[zxfan]

Any windows in the block?

 

[A23]

Loose nut behind the wheel?

 

[braindead_organdonor]

He said it locked up which is what im basing my failure prediction on.

 

[Snail]

Just found out from chev race tech that the CT 525 isn't a good application, recommended a B15 engine instead, better suited for boost. Still an LS platform, bolt in replacement.

 

[Snail]

In stock!

 

[Wretch]

He said it locked up which is what im basing my failure prediction on.

Huge cloud of smoke means at least one piston has a hole in it which could be ring land failure or valve/piston contact.

The loose bits can lock the rotating assembly quicker than a bearing seizing, usually.

 

[Rhino]

I'm still better on valve train failure.

 

[Snail]

Ive spun bearings before and when I did that the engines created heat, power diminished, and knocking and weird noises. I think the bottom end wasn't the failure.

This engine went from full power to no power, splat. Bang!

B15 $9200. Free shipping.

 

[Wretch]

I'm still better on valve train failure.

Yeah, that's why I went with an exhaust valve hanging up in the guide, remaining open after contact, will make tons of smoke too.

 

[Ninjaman12R]

Free shipping.

 

[Team222]

I’ll be different, a holed piston due to a lean condition.

 

[WarpSpeed]

Looks like this is a great fit for booooooooooost

 

[Snail]

Thats it, been drooling. All forged power train.

 

[bowtie]

changing the cam? what's overlap on the included one?

 

[Terry_Schiavo]

Those are all fine & well but youre gona need about 600 dyno horsepowers to get 500ish at the tars

 

[Matt Sterbator]

Plenty of 5.3 & 6.0 engines out there waiting to be blown up for less than a 1/10th the cost of that crate engine.

No tears when they blow...