intercooled vs non intercooled

[Dodgecrawler2011]

Well u sold my truck for another truck. Turns out the truck I was pose to by was trash. Now im looking at a non intercooled 91. How much power loss am I goin to notice. My other truck was a stock 5 speed. ThIs trucks a auto

[rockbuggy4x4]

Well, I have an '89 and although my trans has seen better days, the 5 speed and 727 are two completely different animals.

[Dodgecrawler2011]

What do you mean cant say ive driven a auto cummins

[rockbuggy4x4]

The 727 is only a 3 speed without OD and with a non locckup tc has over 20% slipage. I've never driven a manual cummins but have heard from many guys who have driven both. Most guys would rather a getrag over the 727. Engines are very similar and both make roughly the same power.

[RCCUMMINS89]

There is a HUGE difference in power between a 5 speed and auto in stock form.


But, you can turn them up...........build the trans.................. in the end you'll have the same power.

[Tacoclaw]

Stock for stock, a non-IC'd truck will put a hurting on an IC'd one, and even cranked up the old trucks will throw it down. When it comes to working them the IC'd truck will be better since it'll be able to keep EGT's cooler, but my old '90 ran plenty fast with its 727 and stock injectors cranked up.

It'll throw down better numbers with a stick on the dyno, but it was waaaaaaay faster in the 1/8 with the auto.

Just depends on what you're wanting it for.

[RumbleFish]

If I had to do it all over, I never would've sold my non-ic 91.

[cmann250]

The non-IC engines have a lot of "free" fuel on the table. I have a low pressure piston pump, the typical screws turned, and injectors that I've never had out of the head. That all netted +110 hp and +100 lb-ft of torque, through a stock 260k mile 727. Also, if you want to get crazy with the fuel, they have a wider piston bowl so you can advance timing more and still 100% hit the bowl.

[RCCUMMINS89]

If I had to do it all over again, no questions asked................I would go inter cooled

reasons why:
Stronger frame
better auto transm
already i/c...........good for more usable power
3.54 gearing.......usually
better radiator
better head design
better vacuum pump design
that's all I can think of right now.

Most of us change the turbos and injectors anyways.

[Mark Nixon]

After having owned both, hands down, stock to stock, as delivered, the Non-Intercooled trucks will run circles around the intercooled ones.
The non-intercooled engines have less "emissions" related crap and they definitely are the better stock performer.

I've honestly never had much faith in the stock intercooler.
It's best replaced with a Power Stroke, or 2nd gen unit, to get rid of that restriction up front.

While the non-intercooled piston is the wider 155* bowl, the injector is also the same 155*, so there really is no potential gain from a timing bump, you STILL can run the spray out of the bowl.
Now, run a 145* injector into a 155* bowl and you have something you can put more advance into.
But wait... Why advance the crap out of timing on a VE, when it's technically a low rpm pump?

Mark.

[apexfd]

Good information here. Ive got a non intercooled myself, I love it. What makes the frame stronger on the IC models??

[CumminsPower59]

A good share of 92-93 trucks had taller frames...

[Mark Nixon]

A good share of 92-93 trucks had taller frames...

I have a 1993 D-250 STANDARD CAB that has the tall frame.
Additionally, even though it is a 2WD, it also has the holes for the rear spring hangers for a 4WD front axle already there.
I suspect this was probably one of the last of the 1stgens built and they grabbed what they had for framerails to deplete the stock out.

Mark.