Team NAXJA/Petty Cash Racing stock class KOH XJ build

[StinkyFab]

LMAO!

 

[Exxon Valdez Jeep]

So was it for sure a melted piston in the motor? What failed or had it not been torn down yet? Racing in Texas this weekend?

 

[cal]

well.

after koh, i was kinda fed up with the car. that happens.

i spent some time wandering around looking at campers, as mines getting kinda beat and I spend a lot of time in it.

after looking at about 12-15, i came to a house with this on the front door:

If you don't recognize her, the middle one is Rarity. She lives on the hood of Dallas's Isuzu.

After meeting some nice people, I brought this home.

It is way too nice for me. way. too. nice.

But my hitch, well, maybe a little inadequate.

 

[cal]

I looked at some of the commercial offerings for this problem, but hitch + extension + new camper mounts would be somewhere around $1600. eff that.

They kind of look like this though..

Cut up some of my existing stuff.

Cut up some of the new stuff.

Lots of watching Dallas do real work while I drink beer.

And for little trailers

Still have to deal with chains, wiring, but steps on the path.

 

[cal]

Mark/SidewaysStarion got tired of me not looking at the car, so he came down to the shop and earned a bottle opener.

I'll just drop the photos here, I'm still too fed up to really discuss them.

Plugs 1-6 in order.

Clearly somethings not right.

Fuel enters and exits the rail in front of cylinder 1. to have 1 and 6 burned up, its probably something more than just fuel pressure.

 

[GSequoia]

So have you had to get stitches on your shin yet?

 

[cal]

The next series are phone pictures of a snap on borescope. Sorry they suck a bit. These are random pistons in random orders and unlabeled. At this point there was no reason to keep closer track.

 

[cal]

I have theories.

lets hear what you guys think and we'll discuss it together.

 

[JohnX]

I have theories.

lets hear what you guys think and we'll discuss it together.

Maybe I can't see clearly from the pics...did you just weld a second square tube under your stock hitch tube? Any other supports we can't see from the pics? If so, why? Doesn't add any strength, the weak point is where the original receiver tube is welded to the cross beam.

And theories on the motor....your foots too heavy! :roflmao:

 

[cal]

There's more in there and more coming, ran out of weekend. The entire extension is only 22", just trying to get rid of a lot of the slop in lower end commercial ones.

Foot wasn't that heavy, we'd just raced 85+ miles with the brake pedal sitting firmly on the floor. Never really had the balls to get on it hard.

 

[JohnX]

There's more in there and more coming, ran out of weekend. The entire extension is only 22", just trying to get rid of a lot of the slop in lower end commercial ones.

Foot wasn't that heavy, we'd just raced 85+ miles with the brake pedal sitting firmly on the floor. Never really had the balls to get on it hard.

Okie dokie on the hitch, fyi, I ran a single extension (homemade 18") for a LOT of miles with zero issues.

Just bustin your chops on the heavy foot

 

[RedHeep]

I think you're asking a tractor engine to do a lot more than it was ever designed to do. The problems you have at that performance level are going to continue. You guys aren't a factory race program with a lot of money to figure out all the possible issues and design them out of the package.

 

[XJ_ranger]

I'd check all the sensors, with the rennix, its supposed to be cheap with a volt meter to do. Probably an hour to complete, but worth starting there.


I'd wager that it ran lean at some point, that's the only way to make enough heat to melt the pistons. Plugs look plenty black though.

Any oil in the coolant or vice versa?

 

[cracker]

I'd check all the sensors, with the rennix, its supposed to be cheap with a volt meter to do. Probably an hour to complete, but worth starting there.


I'd wager that it ran lean at some point, that's the only way to make enough heat to melt the pistons. Plugs look plenty black though.

Any oil in the coolant or vice versa?

It has been running for a while with on and off fuel delivery issues.....my money is on lean too

 

[cal]

I think you're asking a tractor engine to do a lot more than it was ever designed to do. The problems you have at that performance level are going to continue. You guys aren't a factory race program with a lot of money to figure out all the possible issues and design them out of the package.

We didn't really change anything though with 5 years of super reliability.

 

[cal]

I think that the alltech baffles are scratching the lining off of the fuel cell, and then ethanol in CA gas is breaking that lining down and its clogging fuel injectors.

I've heard of a few other LS powered teams having that same problem, and I can't see any other way that 3 cylinders would be rich as hell and 3 others would lean out and burn up.

Before KOH we pulled the fuel cell and scrubbed it out. Replaced the lines feeding the system, replaced the filter with a newer and much bigger one (which before anyone asks is rated for way more pressure and volume than is required).

 

[Hypoid]

Injectors are next?

 

[GSequoia]

I'd be curious if any of those live Renix monitors hitting the market are worth a damn (and physically tough enough for race car duty). I'd be particularly interested if they not only read live data but logged it with time stamps as well. Telemetry is always a good thing.

Those melted down cylinders definitely scream lean to me. Maybe pull the injectors and check patterns.

 

[StinkyFab]

I think you're asking a tractor engine to do a lot more than it was ever designed to do. The problems you have at that performance level are going to continue. You guys aren't a factory race program with a lot of money to figure out all the possible issues and design them out of the package.

We are asking a lot, but it's been holding up for quite a long time. Other teams are actually asking quite a bit more and getting it reliably.

 

[cal]

I'd be curious if any of those live Renix monitors hitting the market are worth a damn (and physically tough enough for race car duty). I'd be particularly interested if they not only read live data but logged it with time stamps as well. Telemetry is always a good thing.

Those melted down cylinders definitely scream lean to me. Maybe pull the injectors and check patterns.

I'm thinking new fuel cell, new fuel lines, new injectors, new fuel pressure regulator. All of that will be cheaper than dropping out of a third race for fueling problems.

Russ and I are discussing a rebuild to a level that would take us off of the 100 octane pump gas to a full race fuel, too, and get rid of the ethanol.