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Old 04-25-2018, 10:07 PM   #81
kuntzbros
 
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Bad news for #lildebbie. We were prepping and testing last Friday at the track so we could be ready to attempt a 13s 1/4 next weekend at Rudy's spring opener. Unfortunately though we had an engine failure on the first pass. We were starting have some signs of an issue before but never though it was anything as significant as this. We also are still trying to figure out what exactly happened so hopefully someone will be able to give us some opinions or insight as to what might have happened. To give as much info as possible about what we have going on we tried to take a bunch of measurements and compared them to the build notes. The final major failure happened at the top of 4th gear at the last part of the track and the truck ran a 14.3 at 94mph.

Spec. Notes. Aftermath
Ring gap top. 32. 32
Ring gap middle 25. 25
Piston-wall. 8. 8
Timing. 31. 31

We originally thought we had a bad injector because we had fuel running out of the first cyl while it was running and when we pulled the injectors it did have an issue popping but after disassembling and cleaning it began to pop well again. The others tested fine. We ended up with what looks like a progression of damage. The 2nd cyl was the best and looked new still the 4th was just starting to run, the 3rd was rubbing and the 4th was rubbed so bad it seems like it started to seize but ended up bending the connecting rod instead. Even after testing the injector we still did not suspect this kind of damage because the truck still started right up and ran just line always but was rough. This was definitely something we think happened over time and not all of the sudden and at this point we are not confident in any one thing to put the cause on so any input or insight would be greatly appreciated

20180425_181425.jpg
4th cyl minor damage

20180425_181406.jpg
3rd cyl moderate

The rest are the 1st cly
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Last edited by kuntzbros; 04-25-2018 at 10:10 PM.
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Old 04-26-2018, 07:00 AM   #82
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Hello, a few things that stand out to me. top ring gap is good second should be equal or looser, .008 ptw is acceptable but may be a little tight for a competition engine, .010 may have helped. the rod that bent looked like a polished Japanese rod??? I'm sure a few more will jump in, your pushing that little guy pretty good easy to find weak links........
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Old 04-26-2018, 04:42 PM   #83
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Thanks for the advice on the rods that had not crossed our minds yet and on the rings too. Does the piston wear and damage look like rings butting to you or pistons scrubbing because of ptw clearance. We have been learning towards the ptw clearance being the culprit just from what it looks like but we didn't think we were at the level to need more than 8 thou yet. Is it possible that the Japanese rod could not handle it and the other cylinder and pistons being damaged is because that one was failing?
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Old 04-26-2018, 07:50 PM   #84
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In regards to the jap rod i see it was a polished beam, i don't believe that would be stock.... just wondering what kind of life it had before it landed in your motor? cylinder 3 looks like it took some heat and stuck / scarred above the ring, my guess is trapped heat from tight second ring and swelled the piston. cylinder 4 looks like the ring butted when this happens all or most of the oil the piston rides on is gone and makes heat / friction. i would say you were in the early stages of a mess but the rod gave up on you so you can see what was going on before everything was destroyed. .008 PTW i would have said you would be ok but looks like i would have been wrong also...you can machine the top of the piston above the ring for a little added security, this is where all the heat is. all the above is just my opinion but i hope it helped lol
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Old 04-26-2018, 09:35 PM   #85
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Yes that definitely helps. Thanks for the insight. I guess in a way we are lucky it wasn't worse.
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Old 04-27-2018, 01:30 AM   #86
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Yes that definitely helps. Thanks for the insight. I guess in a way we are lucky it wasn't worse.
I have good 12v rods if you are interested I’m bringing them to UCC as a back up if I don’t use them y’all can have them
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Old 04-29-2018, 11:32 AM   #87
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Thanks Josh we might end up needing those actually because it looks like all four rods were shortened. We finally found out the whole cause was injection timing. There is not much info on box truck cpl numbers so we guessed and assumed one that seemed to match best off the info we had at the time and it seemed to work fine but the best we can figure the 32 degrees timing we thought we had was actually 37. After talking some more people we continued to check some more things and found we went from 15 thous piston potrution on assembly to -10 after with a 9 thous lean indicating that we had actually bent all the rods. That prompted us to rethink our timing and that's when we found out that our timing was not what we thought it was.
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Old 06-25-2018, 10:19 PM   #88
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Lildebbie is back in action after the engine rebuild and with a few upgrades. We ended up getting hooked up with some used mahle power pack pistons from powerdriven and through some other work and trading we ended up with an airdog lift pump and a set of 14mm main studs. Because we plan to take this build as high as we can we also thought it would be a good idea to upgrade rods so we opted for a set of cryo-treated and polished/balanced haisley rods. Everything else remains the same for now. The goal for this set up is to make 600hp on the chassis dyno and finally run a 13s 1/4.

We got everything back together and “tested” at the last odss race in Bowling Green. At the event on sat we had two qualifying rounds and then ET bracket eliminations which we lost first round. The first pass off the trailer went great with heavy fueling but not full fuel it hooked well and ran an 8.72 in the 1/8th which is a new record for the truck. That pass would equate to a mid 13s ¼ so we are very happy about how its it's doing. The rest of the day we had some simple and stupid issues that kept us from running as well.

After being eliminated first round we decided to throw it on the dyno and as always everyone nearby came to watch the entertainment. Lil debbie impressed everyone around and put 600hp to the wheels. We are sitting right where we hoped to be now we just need to get it back to the track for some ¼ passes. Maybe this Friday at the local test and tune.

Lil debbie in line at odss bowling green 2018.jpg

lil debbie in line bowling green 2018.jpg

lil debbie on kenworth bowling green 2018.jpg

http://www.youtube.com/watch?v=7ff92...ature=youtu.be
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Old 06-26-2018, 06:33 AM   #89
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600hp and mid 13s out of a 4bt in a 10-cube?!? Thats pretty damn cool.
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Old 06-26-2018, 06:36 AM   #90
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What was your tow truck originally, was that a fire truck turned toterhome? Cool
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Old 06-26-2018, 08:53 AM   #91
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I swear, just when you think this thread can’t get any better.

Awesome tow vehicle! What’s the story behind that one?
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Old 06-26-2018, 10:48 AM   #92
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600hp and mid 13s out of a 4bt in a 10-cube?!? Thats pretty damn cool.
This!
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Old 06-28-2018, 10:24 PM   #93
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The tow truck we've had for about two years now but this was the first time we actually got to use it to tow #lildebbie. It was one of those finds on craigslist that was just too good to pass up lol. Its It's a 93 Kenworth K300 88k miles with a Ppump 12v 8.3 cummins (6CT). We rescued it from the junk yard where it had been sitting since 2007. From what we were told and looking at the paperwork work in it; it was owned by Turner broadcasting and used as a mobile broadcasting center for live TV. You should see how many cables and wires we have pulled out of this thing lol. It also has two ac units that still work and a 20k generator with some sort of crazy step up transformer the size of one you would find outside your house. We have slowly been converting it to be a toterhome for lildebbie. It just seemed to be a perfect fit for the big box I mean “race” truck. It actually has an AFC live from powerdriven on it and we have also put a heated dual tank system on it so we can run waste oil.

IMG_20170806_210842_330.jpg
before we started the conversion
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Old 06-29-2018, 03:03 PM   #94
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fawkin awsome
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Old 06-29-2018, 05:42 PM   #95
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fawkin awsome

Hey man! Where you been?
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Old 09-17-2018, 10:19 PM   #96
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Time for another #lildebbie update. Since the last time we posted the biggest change we made is the injection pump. We went to Farrel Diesel and Seth hooked us up with a 13mm maxed and balanced pump that is now capable of 970cc at full rack. This pump is absolutely insanse, Seth did an amaing job, we still have yet to use more than half of that fuel. We missed the rocky top odss event while the pump was with farrell but since we have gotten it back we have been to scheids and then to the hardway event and the pump and truck have been running great. Because this pump is so much different and supplies so much fuel it has been slow getting it dialed in. We are having to leave the line harder so we do not flood the chargers but with leaving at a higher boost we have been running into traction issues. We were able to get a lot of passes at scheids but never could get the truck to hook, so between the scheids and hardway event we built some homemade traction bars and they seemed to have helped a lot.

We are still in the process of trying to get it all dialed in and see what the best run we can make with this setup is, but so far we have run a 13.85 in the ¼ and a 8.62 in the ⅛ which are both new prs. Neither passes were as good as we think it could do.

Once we get the truck where we want it with the current engine setup and get a chance to dyno it we want to get a cam and some better valve springs to go with it.

The goal right now is to get down go a 1.8 60ft and as low in the 13s as possible before we get a cam.


20180730_161314.jpg

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20180914_095522.jpg

20180916_130945.jpg


PLease excuse the announcer, he gets pretty excited when #lildebbie shows up.
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Old 09-17-2018, 10:38 PM   #97
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This whole project is the chit!

If getting a 3/4ton truck down a strip is racing a brick...Then this thing is a cinder block

Absolutely awesome man!! Keep it up!
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Old 09-18-2018, 07:54 AM   #98
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focusing on suspension may net you more gain at this point than more engine/setup changes...
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Old 10-05-2018, 11:20 PM   #99
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Hey guys, I am the owner of the T-bird that you raced at the Memphis zip tie drags. Just happened to see this thread and thought I would stop in to say that I love the bread truck and wish you success with it. I sure as hell did not think I was going to pull off the win at Memphis.

Here is the build thread for my junkyard T-bird:
1989 SC needs to run mid 12s
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