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I believe that’s 3” tubing from the compressor to the intake manifold (I was wrong, it’s 3.5”). Pyro’s can be installed before or after exhaust turbine. They read about 200 degrees cooler when they are installed after. They also don’t react quite as quickly so I believe preturbo is the better...

If you'd like even more info on the 855's there's a fbook group I found called Cummins 855 enthusiasts. It's exactly that. The 855 was a dominant long haul engine for 50+ years and this group reflects that. Lots of old truckers who've been running 250's, 290's, 350's, etc. turning them up and...

He’s going to answer better than me, but he’s also likely to mention piston coolers, lower compression pistons, and retarded cam timing (to allow for “fuller” injectors that start squirting sooner).

Tan buggy! That bi#ch is one cheap hot rod!

He sure does. His rail pressure must be sky high. He's having a lot of fun though!

Just came across this wily bastard. He’s nothing if not entertaining and he sure likes turning up 5 ton 855s.

What! I can‘t hear you. Haha. I did wear ear plugs earlier this week. Picking up a log trailer put a little load on it and it really barked (with the temporarily straight piped stack). I had to pull it up a steep hill down cobblestone main street to avoid the highway (bad tires on the...

For my 2 cents, I drove my M809 from PA. to Florida, to Seattle and the exhaust was not bad. The rest of the mechanical noise with zero insulation was much worse but I didn't find it that bad at all, really. I have Goodyear 395's and went around 60 mph on gps at 2100 rpm. I straight piped...

I just took a quick look so maybe I’m wrong but I think the ‘78 article was about a formula 290 big cam engine, which was specifically designed to run at a lower rpm (to increase efficiency), so doesn’t really compare to the 250. Or a small cam 290. I don’t know all the changes made, but I...

Any information whatsoever as to what set up you ran and what problems you had would be greatly appreciated by me. Specifically, boost pressure, rail pressure, EGTs, rpms you loaded it at, etc.

I haven’t added my turbo yet so this may not be beneficial, but I did put a #15 button in and while my EGTs didn’t go over 950 on hills ( I also had no load), my rail pressure would go up to 270 if I let it. I kept it at 210 or less which is where I want it. Based on that alone, I ordered a...