The Stealth BOMB'r is under the knife

[hoot]

Agreed, less load on the pump but the higher loads are only spikes during a hard accel or dyno. I did say it doesn't hurt to do it since it's not that much work or that expensive.

Was just thinking if a 3/8" hose was pushing fuel at some high rate you'd be out of fuel in a very short time.

Just thinking out loud.

You can tell me to shut up but that won't work ):h

READ THIS
http://www.thetruckstop.us/forum/showthread.php?t=23376

 

[Cumminalong]

One thing to keep in mind is that the flow ratings of these pumps, (AirDog and FASS) are not at the pressures they actually operate.

For example, the flow ratings on the AD and FASS are, if I'm not mistaken, done at 5 psi, not the 17 psi that it's actually operating at.

The Rator and HPFP are flow rated at 1 psi.

So there is a pretty significant loss in volume once those pressures are higher.

Providing that volume is key.

The CP3 can draw it's ows fuel, but it's not real happy about doing it. The more volume you can provide that is between 13 -17 psi, the better.

Now, you also have to keep in mind the weight of the fuel in the lines under hard acceleration. Go too big or too long of a line and you start increasing head pressure at the pump.

I'm running about 10 ft of -10 line and then it splits at -10 to dual -8 y-fitting into 18" -8 lines to the pumps.

With all that in mind, before doing this setup, even with both CP3's, 160 HP sticks, 230 HP worth of tuning, etc...., I never saw below 13 psi under a WOT run. It can provide the pressure, now it just needs the volume.

 

[hoot]

Yea the Duramaxes don't have lift pumps at all... in stock form. Same CP3.
Good point about weight of fuel. Hard acceleration gforces to contend with. I would think higher pressure/smaller lines is the key to getting the fuel from the tank to the CP3. Jump back up to a big line going into the CP3 to reduce pressure if that's an issue up there.

 

[randomid25]

Sorry to jump off topic Rich, but are you guys gonna be having anymore get togethers down there this year? I wouldn't mind driving down for the weekend and hanging out.

 

[hoot]

Excellent thread on pumps

 

[Cumminalong]

Well, here was today's fun.

Ran into a couple of snags today. Nothing that couldn't be fixed, but it just added some time to the process.

And, I have a good WHOOPS picture for ya.

So here's how today went down.....

Got the tank back in....no leaks at the fuel sump, so I'm happy with it. Can't plumb the supply line to the FASS until I get a few more fittings. Didn't plan on needing that extra 90* hose end, so gotta wait for that to get here. Cleaned up all the fuel lines and wiring around the tank and FASS....removed the oem supply line totally.

Now, here is where we ran into the first snag. When we went to put the bed back on, one of the bed supports was right on top of the new battery box and the bed wouldn't seat all the way. So, the bed got introduced to Mr Plasma and that solved that problem.

Now, here's the next snag we ran into today. I installed the GN hitch on the frame, cut the hole in the bed at 45.5" from the rear edge of the bed (like the instructions called for on the short bed) and when we went to put the bed on, it wasn't lined up with the hitch.....the hole was almost 2" too far forward.

Sooooo, had to do some cutting, welding, grinding and patching on the bed floor. No big deal, it'll get ground down and re-Linex'd and it won't even be visible.

So here's my WHOOPS for the day.....don't say I didn't share the bad along with the good.

The gap from the hole saw was too wide to tig it in real nice, so had to bump it with the mig. I'll get ground down and re-linex'd and you'll never know it's there.

 

[Cumminalong]

Sorry to jump off topic Rich, but are you guys gonna be having anymore get togethers down there this year? I wouldn't mind driving down for the weekend and hanging out.

Not this year.

We only do it once a year.....there is a VERY short time fram down here to do them.

The 2 weeks in the middle of March are only times it's pretty comfortable for everyone.

Earlier than that and the folks that bring the tents freeze their azz off and any later than that the rain starts and the temps go way up.

 

[hoot]

You could reweld that part of the hat channel you cut out back in to help restore some strength. Just bang it into the gap and weld the long edges. Bang it in upside down.

Looking good.

 

[Cumminalong]

So I got started on the head today.

Got it all masked off, wire wheeled the rust and coatings off and got 'er painted. Gonna give it a few days for the paint to dry good before I put the head back together.

While I was waiting on the paint to dry a bit, I got started on the valves. Got those all cleaned up and ready to go.

Once the paint is dry, the valves will get lapped and the head will go back together.

Someone asked for the size of the valves, so here they are.

 

[BigBlueChevy]

Love the burnout mark under head in the first and second pictures. Getting antsy already?

Now, did you machine the valves, or just clean them up? Do the 5.9 Cummins motors use Sodium core valves?

And, as always, outstanding work. Everything is really looking great :thumbsup:

 

[Cumminalong]

Well, no more issues with freeze plugs blowing under the valve cover.

Got half of them done tonight before I had to hit the house and take care of the dogs.

Here's the process of removing the factory freeze plugs and tapping them for 3/4 -14 pipe plugs.

Removing the freeze plugs.....

Checking the bore of for the correct drill and tap sizing. .872 brings it to roughly 7/8", so to fit it with a 3/4 - 14 pipe plug, we need to bore it out a bit.

Once we have that established, time to move to the mill and set up fof the drill and tap.

Start by centering on the original bore with a 7/8 bit. Once it's centered, swap in the 15/16 bit and bore the hole. Once that's done, swap to the tap center and begin your tap. Stop frequently to check your depth. Once you get the plug roughly flush, you're golden.

 

[Cumminalong]

Love the burnout mark under head in the first and second pictures. Getting antsy already?

Now, did you machine the valves, or just clean them up? Do the 5.9 Cummins motors use Sodium core valves?

And, as always, outstanding work. Everything is really looking great :thumbsup:

Yeah, ya goose the throttle on the Chevelle and she's leavin' tracks.

Just cleaned the valves up. Put them in the lathe and hit them with some scotch brite. Before the head goes back together, I'll lap the valves with the new seats.

As far as the I know, the exhaust valves are inconel....not sure what the intakes are. They definitely are inconel, they had a bit of rust on them.

 

[searstractorfan]

WOW where did you get that VERY modern lathe??? My uncles got one thats slightly newer I think(urs is a flat belt his is a chain style belt that u take links out of).....Hehe using it as a valve polisher? Thanks for that wonderful shot of the head!!! Now I see which bolts I can use for my boost bolt(hehe told u I was kinda dumb on this cummins)....

 

[Cumminalong]

WOW where did you get that VERY modern lathe??? My uncles got one thats slightly newer I think(urs is a flat belt his is a chain style belt that u take links out of).....Hehe using it as a valve polisher? Thanks for that wonderful shot of the head!!! Now I see which bolts I can use for my boost bolt(hehe told u I was kinda dumb on this cummins)....

Yup, any of those ones on the the machined part of the manifold, closest to the head.

 

[Cumminalong]

Got the head done this evening.

Was moving a little slow on it.....spent most of the day at the Optamologist getting 2 pieces of aluminum removed from my eye. Yeah, that was joy. Note to self, don't wipe your face on your sleeve when it's covered in aluminum shards.

Anyways, tomorrow the valves will get lapped and the head will be ready to go together.

Also, got a call from UPS today. My pistons are back here and I need to go over and give them the part numbers and the replacement cost so I can get my junk.....and turn around and send them straight to Polydyn for coating.

 

[Ozzie]

Sweet! I'm getting pumped and it isn't even my ride...:thumbsup:

 

[Cumminalong]

So, I got the pistons back from UPS and the claim is in.

Opened them up and took the photos for the claim right there at UPS.

Here is the condition they came back in.....gonna make some pretty cool paper weights.

 

[BoostN]

That's not good. Hope they take care of it for you.

 

[Cumminalong]

That's not good. Hope they take care of it for you.

You and me both.

I'm so F'n mad right now I want to punch someone in the neck.

:mad2:

 

[12ga diesel]

That's not good. Hope they take care of it for you.

:iagree:

I don't know what else to say Rich, but that really sucks. Hopefully it gets taken care of very quickly.