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Owned by Robert

CutterUp Diesel Lab

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Learn Cummins engine building, machining, troubleshooting, and performance from real shop experience.

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290 contributions to CutterUp Diesel Lab
Easy way to spend a 100k
Well my seat and guide machine has a plc issues see I just it’s time to buy a new machine. Was not the machine I wanted to buy first. But sometimes it’s about what you need. New machine will be nice thought.
Easy way to spend a 100k
0 likes • 26m
https://youtu.be/80B-4tRQrTc?si=K78Kp50eQB-g-bv3
0 likes • 26m
This is a good video to watch
Compounds!
Hey Rob and all, would love some of your expert advice tuning my pickup! Goal: enough power to haul a trailer full of cows down the highway at 75, with enough manners to not black anyone out getting there. Usable low end power is what I’m after, and I have the opposite 😅 l've had it for over ten years and fired every shot of the parts cannon I can find and I'm still not there. It's got plenty of top end power, but the low end is absolutely atrocious and no matter what I do I can't get rid of the smoke. Turbos don't spool until roughly 1800 rpm and anything under that is a luggy mess. Once I hit 2k it drives pretty good, but it's pain to keep it that high around town or pulling a trailer. Max boost is 45ish at WOT, but I never get there in normal driving. 25-30 is the most it usually sees. Mods: DPS stage 1 compounds. 362/475. THD 6 x 11.5 injectors Hamilton towing cam Head studs/valve springs/pushrods HVLP lift pump M&H Timing spacer Ratman DV’s Ratman fuel pin 3200 rpm spring NV4500 Water/meth but not really using it Pump settings: Smoke screw: all the way backed out. Starwheel: almost all the way backed out. Power screw: 7 full threads showing. Recently backed it out 2 full turns to help smoke. Definitely lost some top end though. Timing: somewhere in the middle, hopefully around stock but there’s multiple marks so unsure exactly. I have adjusted the timing to every 1/8” from the head the slots allow and it never gets noticeably better than where it’s at. What I’d like to do: figure out how to run smaller compounds like a k27/369 but not sure my budget and fab skills will cooperate. Other ideas include figuring out how to make an s300g work as the manifold charger. Also does it need different injectors because people say Eric’s just run dirty? What would you do? Anyway, all the advice is much appreciated, and I’d also be interested in buying a smaller compound kit or piping that would work if anyone has stuff they’ve made! Thanks!
0 likes • 18h
0 likes • 12h
Setup will work. I have done that kit 100 times years ago.
Cylinder Head Freeze Plug - 12 Valve
I thought I could thread these but I’ve got the wrong tap. Can someone give me the size of these freeze plugs? Either for tapping or freeze plug replacement
0 likes • 12h
I do them 22 mm
Repair Guessing Game! Continued
1997 Dodge Ram 3500 – 12-Valve Cummins (P7100) – Need Help Diagnosing This guy explains all my problems almost to the T. https://www.youtube.com/watch?v=1xUy3NF_Ma8 I've been chasing a fuel-related issue for a while now, and here's the timeline. Truck cranks no start starts with ether/starting fuel Took it to a shop they diagnosed as an overflow valve. Changed that and same exact system Fass system installed. It works because i tried bleeding and it getting to the injectors. Shut off Solenoid is functional Idle Screw has been adjusted At this point i'm not sure what this issue is. I plan on taking it to a different shop that specializes in diesel. I don't want to wrench it on anymore... I'm exhausted all my options Any diesel mechanics or recommendations in the seattle area?
1 like • 2d
Really only two options at this point. The timing is wrong Or the injection has an internal issue. I do know of place that might be able to help. But I can’t think of his name off the top of my head
Ve on a vp44 issues
Thanks for the link to the group.! Hey Rob i got a Ve swap 98% done. How how do I time and pump tune this prick? Last I knew 1 tooth ahead of (C). Injectors popped to 3550psi. Please help a guy Im a stunned mouth breathin mongoloid. Im missing something! Plz be nice fellers and fellets. Ive been beating myself up enough @Michael Marks
0 likes • 2d
@Michael Marks what’s it do when you rev it up
0 likes • 2d
@Michael Marks seen short video of it when you try to rev up. Likely wants more timing
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Robert Winkworth
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@robert-winkworth-9280
Welcome! Whether you’re here to pick up a few tips, show off your build, or hang out with other wrenchers, this the place to be. Enjoy!

Active 26m ago
Joined Nov 25, 2025
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