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Old 11-05-2017, 08:36 PM   #73
kuntzbros
 
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Name: kuntzbros
Title: Green Behind the Ears
Status: Not Here
Join Date: Jun 2017
Location: Jefferson, GA
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Posts: 34
It’s safe to say we’ve been learning a lot in the journey of this #lildebbie build. In the process of trying to get the motor back together we made a huge mistake and thought we were given non ic pistons from someone we know but it turned out we had 24v pistons and we didn’t even notice until we had already got them back and put them in the motor. So we purchased some new non ic pistons and once again copied Wills Junker build and did some piston bowl work to widen the bowls. This also pretty significantly lowered the weight of the assemblies as well as provided more protection for the first compression ring from both high combustion pressure and high egts. Once we did finally get the right pistons it was the machine shops turn to make a mistake. Because of the fact that the bowls on the non ic are off center they were not able to do them in their lathe and so they used a mill but for whatever reason had a hard time getting the angle and depth we were needing. Finally, after a few try’s they were able to get them pretty close but in the meantime, we were slowed down significantly so we decided to go ahead and paint the truck and get it all ready to go.

1152017 cut non ic pistons.jpg

We grabbed some (many) sanding discs for the orbital sander and 3 gallons of Massy Ferguson Gray from tractor supply and had a fun weekend. If you want to learn how to paint just paint a 30’ box truck and I promise by the end of it you will know how. Once we had our extremely amateur paint job done it was time for stickers. With help from the girlfriend and her sticker maker we proceeded to remake and add some stickers to the new truck.

1152017 painting roof.jpg

1152017 truck being painted.jpg

1152017 painted.jpg

1152017 kuntbros sticker.jpg

1152017 stickers done.jpg


Finally, with the motor back in its spot and everything put back together it was time to fire it up last Sunday, which just happened to be extremely unseasonably cold for GA this time of year ~40 degrees after priming the oil and fuel we tried to turn it over but it turned over very slow and did not want run. With the help of just a little ether it was up and running Extremely roughly, but eventually smoothed out much better once it was warm. After it was warm we retorqued the head bolts and then throughout the past week we proceeded to break it in and retorque it but were having issues with the fuel pressure which we assumed was just a clogged fuel filter.

1152017 trans mounted.jpg

1152017 motor installed 2.jpg

1152017 motor installed 3.jpg

1152017Motor installed.jpg


With Friday closing in we were wanting to get one more retorque and test in before running it at the track and in the process of running it, we once again had fuel pressure issues which took us most of the evening to track down and finally find out it was the actual lift pump screen that was completely clogged with rust chips. Good ole Cummins still running with about 10% of the fuel it should have. I wonder if that was part of the reason it was hard to get going on first start. After finally getting the pump and lines back together we then could not seem to get the thing to prime. We tried everything and ended up just taking the line from the tank off the lift pump and using some good ole mouth suction to bring the fuel up to the pump and then from there we were able to get it to prime and start but then of course as luck would have it; it turns out that while the truck isn’t any longer than the other truck, but the box is from another company and is longer by 16 inches from the rear axle to the back of the box. This was enough to make it almost impossible to load. Needless to say we made it load and proceeded to head to the track but did not end up getting there until after 10. They were nice enough to let us run but there was only enough time for two passes. The first pass we blew an intercooler boot that someone forgot to tighten in the rush to make it to the track and on the second pass the truck ran very well and with about 60 percent fueling and boosting about 60 psi was able to make a 14.43 pass @ 91mph which is a new record.

1152017 drag slip.jpg


We also were able to put the truck on the dyno at the local truck pull event. The same one we went to the first time we dyno’d the truck last year. Unfortunately, the dyno was different this time and with it being unloaded and not having the built-in loading effect from the 400+ lbs of commercial wheels and tires we could only get it to boost 60 psi even on full fuel producing a hp number of 430. The truck sounded and ran great so we were still very happy with the results and of course everyone loved seeing a box truck with a hood stack roll some coal on the dyno. We are now all set up and ready to see how fast we can get the new truck down the track next weekend at Diesel Thunder.

1152017 dyno sheet.jpg

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