12 Valve Engine and Drivetrain Talk about the 12V engine and drivetrain here. This is for 1994-1998.5 engine and drivetrain discussion only.

Its....done...almost pictures are up

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Old Apr 10, 2009 | 06:40 PM
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Its....done...almost pictures are up

This first one gets you to pictures I think.

https://www.dieseltruckresource.com/...2&limit=recent

https://www.dieseltruckresource.com/...hp?photo=38310

I dont know how to show pictures in threads...but I uploaded a bunch of the engine. Its about ready to go in.

Good or bad, I hope it goes another 250k. It s a 020 over marine style piston. They came coated on the skirts, and I had the crowns done with piston coat. The dish is 52 cc I think. Stock I think is 45?

Anyways, I coated a bunch of stuff, cause I wanted to, sort of as an experiment. I m going bigger on the small turbo to a 19 cm divided hx40, and a 26 cm divided ht3b. The exhuast housings are new to me, and Im testing quick spool valves on both. On gas turbo set up's we have logged 33 % sooner spool up with no other changes. The quick spool valve closes off half the housing, raising pressure on, then opening when boost comes up.

The rest of the engine is a helix 2 cam, new bearings, alittle grinding on the block for oil delivery, a 020 thicker head gasket, since I surfaced the block deck, and I ported the head, had it surfaced and cut .039 x .031 deep grroves. I installed .041 wire (with super glue) . The wire lands mid compression ring on a stock cummins gasket (which says made in china btw)

I cut the rocker stands .200 for the studs, and I copper sprayed the head gasket, just prior to installation. No pics of that, but thats why its gold after the head is on.

I timed the pump to .230 inches at tdc, which is 5.9 mm on a 215 pump and = 17.5 degrees.

This is a trailer towing build.....that will be alot of fun when its not towing.
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Old Apr 10, 2009 | 06:49 PM
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Looking good man! What head studs did you go with? Going to use the same twin setup?
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Old Apr 10, 2009 | 06:56 PM
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Arps, sequenced once to 125ft lbs so far. Ill do em a few more times also. The twin setup I made, and it stays the same, except for the change to the quick spool valves, and the 3b divided 26 housing , (it had an open 26) and the change from teh hx35(14cm) to the hx40 divided 19 housing with a quick spool valve. I hope it spools like the hx35 or better actually...but carries out much further and runs less egt. I never had a real egt problem, but if its lower I can run it harder, right? I run a 4000gsk, a 10 plate full forward and ddp 4 injectors.
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Old Apr 10, 2009 | 07:31 PM
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From: Beautiful USA!
Originally Posted by 1320
Arps, sequenced once to 125ft lbs so far. Ill do em a few more times also. The twin setup I made, and it stays the same, except for the change to the quick spool valves, and the 3b divided 26 housing , (it had an open 26) and the change from teh hx35(14cm) to the hx40 divided 19 housing with a quick spool valve. I hope it spools like the hx35 or better actually...but carries out much further and runs less egt. I never had a real egt problem, but if its lower I can run it harder, right? I run a 4000gsk, a 10 plate full forward and ddp 4 injectors.
Dumb question, but what are these quick spool valves ?
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Old Apr 11, 2009 | 03:27 AM
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Are you running an undivided exhaust manifold?

How much meat came off the deck of the block? With the marine pistons and the thicker head gasket, you have knocked off a good amount of compression.

If you took .010 off the block, you are looking at a CR of something like 15.1:1, if the amount is negligible, then its more like 14.6:1. Thats a pretty big reduction.
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Old Apr 11, 2009 | 07:20 AM
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Originally Posted by Tate
Are you running an undivided exhaust manifold?

How much meat came off the deck of the block? With the marine pistons and the thicker head gasket, you have knocked off a good amount of compression.

If you took .010 off the block, you are looking at a CR of something like 15.1:1, if the amount is negligible, then its more like 14.6:1. Thats a pretty big reduction.
No Im not running an undivided exhuast manifold, but I do have an open spacer, that my waistgate is stubbed off of, so essentially it is open.

These "marine" pistons are not cummins marines, but aftermarket marines....yea I know....anyways, as I figured it , it should be 15.6 or 15.7
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Old Apr 17, 2009 | 11:43 AM
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dam that looks like its gonna be intersting
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Old Apr 17, 2009 | 07:04 PM
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Major drool.

How much have you got into it....time and money?
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Old Apr 17, 2009 | 07:44 PM
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Looks great, very nice attention to details.
Let us know how all the piston coating holds up.
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Old Apr 18, 2009 | 06:46 PM
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time and money......

Ill get as close as I can, even though I dont really want to. Im a cheap skate, and I do everything myself. I really splerged on this becaus eits my truck and I have no intention of not driving a 12 valve. If something happens to the truck, Ill buy it back just for the engine/trans, and I know that.

Its been down since thanksgiving, but I didnt start to build it till january/feb because of money.

200 for orings a surfacing head
300 on the block for the bore and torque plate hone and surface
180 to coat pistons on crowns
640 for pistons
180 for rings with total seal second
490 for helix 2 cam
400 for gaskets and seals I think
460 for head studs
80 for machining rocker stands down .200
000 for teh valve job (cause I have a lot of machine work done on other lsx)
xxx bearings I cant remeber
20 pilot bearing
200 for head coating (might have been 180)
150 to coat two new exhuast turbo housings
10 valve seals (wholesale company i deal with)becasue i didnt like the ones in the kit
144 new rod bolts
560 fans
240 radiator


I built it, and I have alot of time in it because its my first cummins. Ive probably built 100 engines but never a cummins. So between not being familiar and being sure by double/triple checking, I probably have 30 hrs of assembly time, 5 hrs of cleaning (and I have a commercial hot tank) , 5 hrs of detailing, not counting breaks/ talking with friends, and being pulled in 10 different directions in the shop.

I thihks thats about 4000 $....thats about what I figured it would cost.
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