Builds Cummins 6bt/nv4500 build

[Mr Cimarron]

Should be ready to start up and see what happens with all my modifications in a bit. Came in from the Texas cold to think for minute of anything I might have forgot to tighten, install, or left out. Still need to install the heavier valve springs but I want to see how it goes with the AFC springs, fuel plate, and governor springs first. Also need to purge the cooling system since this will be the first start up since replacing the thermostat housing. Here is what I did earlier.
The area I needed to get to was behind the throttle linkage.

Area somewhat cleared. You can see the wire, that is blocking the cap, that I cut away. Yet another Cummins stop sign. This is the cap I ruined earlier by messing up the treads. $5 and a 40 mile round trip problem solved. The nice guys at Cummins sent me down the road to fuel injection performance shop and lucky for me they had some p pump parts laying around.

After removing the cap I was now able to manual turn the engine over to make the governor spring thingies visible. I made a nice tool out of a cup so I wouldn't drop any springs or other crap in.

Next up unscrewing the retainer bolt and removing three springs and retainer from inside. I had to turn the crank the engine again to find the other spring housing and do the same thing.

Stock springs (left) compared to 4k springs(right). This will let me fuel the engine all the way to 4,000 rpms. Stock springs start refueling around 2,200 rpms.

 

[The Phoenician]

My 4bt used to stop at 2200 rpm. You're gonna love the 4000 rpm springs. I guaranty it.

 

[Mr Cimarron]

Wow, the Cummins is officially awake now. Boost is pretty much instant and more of it. Got boost up to almost 25 which before it was around 18 max. I have read that the Cummins should be 1lb of boost for every 10 HP so that should be about right. I didn't take it above 3,000 RPMs since I haven't swapped valve springs yet . It didn't blow a lot of smoke either except on full throttle.

 

[Mr Cimarron]

Took a video break today while I let the new coolant do it's thing. Started up just fine after all the goodies were installed.

 

[OGBeno]

Glad to see you are getting through all of the quirks and growing pains and driving this sucker.

 

[maxamillion2345]

In before blow up rear axle

It's amazing the difference a plate and playing with the AFC can do.

 

[Mr Cimarron]

Glad to see you are getting through all of the quirks and growing pains and driving this sucker.

Sometimes I need the growing pains. I always think it keeps my mind sharp. Having said that I'm ready to drive for awhile.

 

[Mr Cimarron]

In before blow up rear axle

It's amazing the difference a plate and playing with the AFC can do.

No kidding. I really didn't know what to expect.

 

[RockJock82]

Get them springs in! Next video should be a wot roll . I'm shooting for 350-375hp on my 6bt, the 442 should hold up.

 

[Mr Cimarron]

Get them springs in! Next video should be a wot roll . I'm shooting for 350-375hp on my 6bt, the 442 should hold up.

I hoping to tackle it before the weekend.

 

[bryson]

I also need to find some new intake horn bolts. The ones I pulled out this weekend are not to my liking. It looks like there was red loctite on them as well which I don't have. Only blue.
View attachment 1016614

I'm not 100% certain, but I don't think the red substance is a thread locker. More likely it is some sort of anti-seize to prevent the steel bolts gluing themselves to the aluminum intake manifold/plate. Use of a thread locker may ruin the aluminum next time the bolts are removed...?

 

[Mr Cimarron]

I'm not 100% certain, but I don't think the red substance is a thread locker. More likely it is some sort of anti-seize to prevent the steel bolts gluing themselves to the aluminum intake manifold/plate. Use of a thread locker may ruin the aluminum next time the bolts are removed...?

I didn't use any thread locker when I put them back on since I want to find new bolts. I guess I need to do more searching and find out what it was.

 

[GLTHFJ60]

I have read that the Cummins should be 1lb of boost for every 10 HP so that should be about right.

I wonder if that's supposed to apply to the 12v motors or to all of them. Must be specific to the 12v because I don't think I'm making 350hp

Good work on all the mods!

 

[Mr Cimarron]

I wonder if that's supposed to apply to the 12v motors or to all of them. Must be specific to the 12v because I don't think I'm making 350hp

Good work on all the mods!

This is one of my book marked sites that I get info from. Its hard to tell what's normal since it seems there are many different combos of pumps and turbos. Different combos for auto and manuals. I can read the Internet for a week and not a have a grasp on what is normal.
http://dodgeram.org/tech/dsl/FAQ/turbo_faq.htm

 

[Mr Cimarron]

Took another day off from work to get the valves done. I'm lucky my job is seasonal so the winter time I can take a lot of time off. I started on the 1 & 6 cylinders. #1 was good to start with since its easy access. #6 was brutal leaning and laying over the engine. Took about 3 hours to do those but that was a lot of second guessing and turning the engine over and over making sure I was getting it right. Now that I have a grasp of everything it should go much faster. Still planning on a all day event since I will need to adjust valves when finished. Couple photos of everything so far.

Old (left) compared to new one.

 

[Mr Cimarron]

All done. Valve adjustment went okay. Adjusted intake to .010" and exhaust to .020" using a feeler gauge and tried my best to make them all match by making it the same amount of effort to move the gauge around while tightening it up. Not tight but not loose. Torqued everything down to spec, cleaning off the valve cover gaskets, put them back on and called it a day. I did start it up and nothing blew up so thats good. I will have to wait on the test drive since its cold and rainy at the moment.

 

[Mr Cimarron]

Posted these in the 0-60 thread but Wanted to put them here as well to keep track of things. First one is a half as attemp to show how well the Cummins gets up to speed. Not a very good attemp since I was trying to drive, shift and hold the phone while turning into the highway. Second video is 50-70 in 5th gear. This is where I notice the big difference after my power upgrades.

 

[GLTHFJ60]

Nice vids!

What are your EGTs like now?

 

[RockJock82]

Which turbo are you running? Nice vids

 

[Wheelingnoob]

Damn that 50-70 pull is done in the time my Isuzu goes from 50-52.