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Welcome to 4BTswaps.com. We are a web site about diesel conversions into all vehicles though we are heavily focused on the famous Cummins 4BT engine.
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Latest Posts From 4btswaps.com

hx30w part number
I have a 94 4bd2tc and I have decided to go with the hx30w holset and I was wondering if there is a specific part number that works the best on this...
Thoughts on "earth day"
Over the weekend I got into a discussion on what it means to be "green" and the short version goes something like this... One of my kids friends was...
Carbon fiber valve cover?
Anyone running one and like to share experience and costs? I have a co-worker making me a set to test and would like some input on these. I have...
injector rebuild
After looking over my fueling system I've decided that my injectors need some attention. I have one that looks pretty good, one that shows some wear,...
Building a Boxvan
Hey guys, My brother and I have 3 91 Box vans with intercooled 4bts. One is still stock aside from the pump being rotated, another one has had...
The 4BD1T Oil Pump/Pressure Analysis
As some may know on this forum I have been experimenting with the oiling system of the 4BD1T. Some forum members were wondering if their oil...
1959 Ford F-250 4x4 4bt
I kinda stalled out on my project for a while. I am back on track now though. The truck is now drivable and it is almost finished. Ive just got to...
Trying to read between these lines...
I don't think there is any reasonable expectation for anyone giving these guys any sense of "Plausible Deniability". Deception in your face is what...
Run-away questions
I've heard run-always are caused by three things. 1. Defected or miss adjusted injection pump. 2. Running the engine in a fuel atmosphere....
1969 F350 Crew Cab on 04 Superduty FX4 frame with Cummins 5.9 12valve Build
Before I got "distracted" by the lure of the 4BT, I had set my heart on building an F350 Crew Cab I located. I have wanted to do this for three...
86 chevy k20 5.9 swap transmission questions
To start off i have a 86 k20 reg cab long bed. I went through the whole truck and have the 12v sitting in the truck with motor mounts I ordered from...
normal engine temp suddenly went up a bit--not too high. Thermostat?
First off, thank you guys so much for all the helpful advice! My 4bt-powered RV (converted from an old Hostess delivery van--if you're on FB, check...
I need help on understanding why my 4bt is blowing air out the thormstat
I recently rebuilt my 4bt. I change the head and I have a problem with my day tank blowing the water out. I have a water cooled exhaust manifold on...