400 big cam 3 cummins heavy haul setup

Where in the ever living F### did you come up with that Bull$hit idea ?
That is so far from the truth
You should stick with your Cummins idea You don't need to own a Cat motor
Cause truthfully I don't think you have the slightest idea how a mechical motor really works

 

Who told you the 9Y4004 is steel top they are 1 piece aluminum. No such thing as steel tops for a 3406 road engine till the 8PN. With their bowl design I’ll stay aluminum. No reason a 1 piece aluminum won’t stand the pressure till 600 anyway. Also do not take the screws out. If you go past the max travel limit with the fuel screw it allows the rack bar to hang on the end of the scroll gear. Starts a burr then you’ve wiped a pump cam out. Pull the torque rise screw and you’ve lost your torque rise and half the usefulness of the full range govnor that made CAT what it is.

just a little info for those that think you can just turn a screw. Every turn you turn that fuel screw the more fuel it passes through the plunger. Which winds up on top the #### plunger. Every time that plunger comes up to fire it it beats the living piss outta the pump cam. Bout 2500 a whack just for the cam. Same as turning the rail pressure up on a Cummins sure it runs good but not for long. Risk and reward

Now there are good options in the industrial line. I had 1 B model with 3412 pistons. But the bowl is wide so you run a 3425 nozzle not a 3421.



I hear all the time cuz I heavy haul I need more. The 400 is a fine motor. Build it to spec put air to air on it and an N14 turbo and leave it alone. It will live otherwise put heads on it weekly. Lots a big #### was moved with a shiney 290.

 

A completely and utterly false rumor. Stop listening to the stinky truckers at the lunch counter

 

There's the new piston that replaces a 9y4004 is a two piece steel top piston, not a solid 1 piece aluminum. Uses the same wrist pin and nozzle. As far as nozzles, 3421 is just a stock 7fb nozzle and it fits the 4004 bowl. Wasnt trying to give him a recipe to build the hottest 3406 a person ever seen, that would be be kinda stupid. In his case, Im talking something that would actually run and stay together. You could easily get 500 hp outta that combo and not totally destroy it. As far as taking the screws out, you can. Timing is way more important than anything on a 3406. He could leave the screws in stock position and with bad timing it will eat itself up anyway. He's more interested in the Big Cam, so all this is moot anyways.

 

I can tell you that shorter wheelbase sounds like a good idea but a lot of states will cut your weight by not having a long enough bridge. I have a 268” wheelbase and still get dinged in places.

 

No it’s one piece aluminum. A little hint when CAT calls it a body assembly or piston body assembly it’s 1 piece. There is no 1 piece steels so….


I have idk how many in the scrap pile behind the shop. How many would you like to see that a magnet doesn’t stick too. CAT doesn’t offfer the 9Y4004 any more it’s updated to a 1W9372.

Just a quick google search of said number and dozens of aftermarket pop up here’s one and guess what it’s aluminum

 

Yeah youre right, but I wasn't referring to Cat, I'm talking about IPD. They made that piston body that interchanges with the 9y4004 and stays at 14:5.1 compression. I'm not much on aftermarket, but I really do like IPD piston and liner combo thry offer for Cat. To be honest, I wasn't trying to go into specifics in here. Nothing against OP, but he doesn't know what any of the things we are talking about even mean and that's ok but I was just simple saying what combo of parts I know that works and have used personally. Not saying it's better or the best. I know that you have your own recipes as well that work just as good. That's what I enjoy about these conversations. The combinations of recipes is endless, which is fun. If you're into that sorta thing.

 

That’s the enhanced durability kit from IPD. The bowl angle on it is wider than a 7FB. Been there done that too. It’s only after market. You call CAT and tell em you want dem 2 piece upgrades and see what they say. I have put several of those kits in for people nothing bad to say about them. Other than you set them up like IPD says they will trail smoke.

Wjat started me on on this whole deal is you said the 9Y4004 is steel. That’s bad info, put out there like it is. As in this piston crosses to that.

I stick by what I said you pull them screws your gonna have a mess. I have a lot of money, lessons learned the hard way and studying in my B.

 

I know what you're saying. I wouldn't say it's necessary bad info, but I guess to the people that aren't up to snuff on all the upgrades and possibilities that's out there and if they only buy Cat parts, then I guess some could take it that way. That piston combo is the closest thing to being able to run 3421 nozzles tho, so that why i like them. Think the pump is a whole other conversation. Alot of particulars there that people is gonna argue about. Not really interested in all that.

But will you atleast tell the guy to forget about that switchblade turbo? I'm not and never have been sold on that idea. It's a good idea in theory I suppose, but in the real would it just doesn't work or last like a simple single turbo.