How To Properly Tune A 12 Valve Cummins! (From The Expert Himself)

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3 жыл бұрын

Shows how to properly tune a 12 Valve Cummins from the expert! Wally has 1.2 MILLION MILES on his 93 1st gen currently mostly due to owning a hauling business in the 90’s. He still uses it to pull his 58 foot race trailer around to racetracks around the country.
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Пікірлер: 47

@xXnocturnumXx 2 жыл бұрын

Just a correction: the deep grove of the fuel pin is supposed to face the front of the truck if you want full fueling, not the back as you stated. Also, back the smoke screw (low boost fuel control) flush with the cap to remove unnecessary smoke and adjust the star wheel (high boost fuel control) to clean up full throttle smoke. Smoke = heat and wasted fuel. You need to adjust the idle screw back to around 750 rpm after bottoming out the fuel screw and its recommended to have the intake boot off with something to choke it on first startup in case of a runaway.

@josherhard7808 Жыл бұрын

The VE pump is different between the intercooled and non-intercooled 1st gen. Do not crank the fuel screw all the way down it will have a run away. I know from experience

@keeprtuned Жыл бұрын

Thanks for the tip brother!

@48northphotography5 Жыл бұрын

It looks like a survivor. I love the patina.

@keeprtuned Жыл бұрын

Thank you it was a good first truck!

@ronsre-creations5289 2 жыл бұрын

Nice original Cummins my friend 👍

@grantniemi8629 3 жыл бұрын

If you want alittle more power you can also install a 3200 governor spring, the hungry diesel fuel pin, and bump your timing. Also you do not need that nylon bushing.

@keeprtuned 3 жыл бұрын

Put in a m&h fuel pin since then

@peterschmidt2849 Жыл бұрын

Gorgeous 🇺🇸🤌🏻

@dadgarage7966 11 ай бұрын

Diesels were a secret back in '93.

@jimmungai1938 2 жыл бұрын

I highly highly recommend when you turn that star wheel down before you do that put some kind of a mark on the wheel to the housing before you do that that way if you for some odd reason or you need to or whatever turn it back to where it was you can do that in anyway but creating excess of smoke and stuff it’s just a waste of money man fuel washes your cylinder walls down and I’ll tell you something else it’s draws he taught us guys from the do you know the EPA in those gangsters anyway this is six in a row jim from Kennerdell Pennsylvania I got a 91.5 dodge give you three guesses what’s under the hood

@jesserasso1042 2 жыл бұрын

Now you need to do the 1/8 inch timing bump jump the pump gear ⚙️ one tooth clock wise and a static timing plate

@keeprtuned 2 жыл бұрын

That’s on the list!

@CUTTERUPROB 2 жыл бұрын

i would be interested in a video on your trailer that's in the thumbnail

@DieselDethan 2 жыл бұрын

Looks good to me except no reason to have the prebost screw cranked down with the sternwheel already bottomed out. Too much fuel at idle. And you may have or not have but the deep side of the pin goes towards the front of the truck.

@keeprtuned 2 жыл бұрын

Be sure to subscribe and I’ll put out more good videos!

@ricocoman 3 жыл бұрын

Great video! Did I see this wrong but always thought the fuel pin ramp faced forward towards radiator?

@keeprtuned 3 жыл бұрын

Yessir we just found that out recently, turned that fuel screw around and she does even better now 👍🏼 it’s been 20 something years so he kinda spaced on that part

@93bb3504x4 2 жыл бұрын

Yes deepest part towards the radiator. I run my “smoke screw” out flush with the cap. Get more travel and less smoke off idle. And if you throw a gov spring in it you’ll see more difference than you did with the pin and fuel screw.

@keeprtuned 2 жыл бұрын

Gov spring installed, runs amazing 👍🏼

@shiningstaer 2 жыл бұрын

I want one

@bigpapi1184 2 жыл бұрын

So I’m planning on doing the same thing any way you can tell me step by step to make sure I do it right

@keeprtuned 2 жыл бұрын

Yeah man shoot me a message and I’ll walk ya through it

@peterjanvanbijnen226 10 ай бұрын

i thought that the cummins 12 valve had an bosch line feul pump

@ronskancke1489 Жыл бұрын

If I put that spring up there it would be gone by the time I was to reinstall it. I always use magnetic pans.

@keeprtuned Жыл бұрын

I have a few as well. Thanks for the reminder!

@ronskancke1489 Жыл бұрын

Hey just saying. I have a 92 Cummins. 200 thousand miles. I'm 71 and it will outlast me by years. I drive it about 1000 miles a year pulling a small trailer of firewood.

@keeprtuned Жыл бұрын

You can’t beat the ole trusty 12v!

@issatummins 2 жыл бұрын

how do you know how much to unscrew the fuel screw

@keeprtuned Жыл бұрын

You screw it in finger tight and then back out a quarter turn then jam the nut back on to hold it in place. Don’t force it or you could cross thread the screw and crack the top half of your pump

@CarsCumminsNCams 8 ай бұрын

That "clicker wheel" as he said wont turn for me, is there something I need to do first, or is there an issue with my VE pump? Does anyone know?

@keeprtuned 8 ай бұрын

Try clicking it the other way. Maybe it’s already been adjusted down by someone else

@CarsCumminsNCams 8 ай бұрын

No, the truck was bought new by my grandfather, he never went in there and modified anything. Definitely nothing done by him. When he passed, the truck went directly to me so there was no one else to tamper with it.@@keeprtuned

@keeprtuned 7 ай бұрын

@@CarsCumminsNCams I gotcha. Wonder why it won’t turn then. I would reach out to Eric at the hungry diesel and he will know the answer. He rebuilds these pumps all the time and always has spare parts on hand.

@pilhoney10 Жыл бұрын

unburned fuel going out the tail pipe.

@theneanderthal6854 Жыл бұрын

Mamaw yards gonna be charburned in no time.

@TheRoyalBavarian 2 жыл бұрын

All good except the smoke. Gets old and seems to cut back in fuel mileage

@andreyzagoruyko5390 2 жыл бұрын

I know this is tuned for power, but how many mpg's does it get? Trying to tune mine after doing many upgrades and only getting 10 smh. Thanks!

@keeprtuned 2 жыл бұрын

I’ve driven this truck to Missouri and back, around town with heavy loads in the bed I get an average of 20mpg

@AlaskaMike72 2 жыл бұрын

For mileage, you want to bump up the timing (advance the injection pump 1/8" from the index mark) and free up intake and exhaust. The stock muffler is very restrictive, and the stock airbox is also. Keep in mind that 4x4 trucks won't get the mileage that the 2wd trucks are capable of. Also make sure you check the easy stuff, like whether you have brakes dragging. I'm not sure what "10 smh" is, but if you meant to write 10 mpg, then there's definitely something wrong. You should be getting at least 15 mpg on a completely stock truck.

@paulhuwig1434 Жыл бұрын

Bad idea to tune a stock 12 valve ? 400k miles

@keeprtuned Жыл бұрын

No sir! Wake her up a little! Just don’t overdo it with crazy injectors and a massive turbo. Turn the fuel screw up and add tat fuel pin and gov spring and let her breathe with a 4” exhaust and intake