7.3 IDI custom turbo camshaft - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 10-09-2005, 03:25 PM   #1 (permalink)
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7.3 IDI custom turbo camshaft

I really kick myself everyday since I let go a sale on ebay for a custom ground turbo grind for 7.3 diesel, I cant find any manufacture that makes a specific camshaft for this engine.
Is there not enough 6.9/7.3 owners that have turbo charged thier engines to attract any intrest to any cam manufactures to make a grind for us guys? geez why has it been so many years that have gone by and no turbo grind cam been made?
I guess its simple enough to send in a core to the manufacture of your choice and have it reground for less than $500
Javier
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Old 10-09-2005, 04:48 PM   #2 (permalink)
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Re: 7.3 IDI custom turbo camshaft

ya--then you may have to buy longer pushrods--as when they regrind--the lobe center changes--because of regrind height--dont know if there even available--
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Old 10-10-2005, 02:23 PM   #3 (permalink)
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Re: 7.3 IDI custom turbo camshaft

that is not even a problem, custom made pushrods are not hard to find, especially .080 wall ball ball pushrods, the camshaft is the problem
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C-6 with GearVendors overdrive 3.55 ring gear
Synthetic SAE 10W-30/SAE 30 Heavy-Duty Motor Oil,
Evans NPG coolant.
AMSOIL ATF in the transmission, AMSOIL gear oil in the diff.
20MPG city 25/28 hwy
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Old 10-10-2005, 03:59 PM   #4 (permalink)
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Re: 7.3 IDI custom turbo camshaft

I don't recall ever hearing anyone talk about cams when it comes to diesel performance. [img]/ubbthreads/images/graemlins/shrug.gif[/img] I'd like to know the specs and performance results. More turbo doesn't overcome any flow issues? [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
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Old 10-11-2005, 10:47 AM   #5 (permalink)
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Re: 7.3 IDI custom turbo camshaft

I'm not an expert on this, so I can't quote verse on the hows and whys, but I've read enough to be convinced that cam changes do not benefit our diesel. Unlike a gas engine, which is always fooling with the air to fuel ratio, a diesel uses just as much air at idle, as it does at full speed. The idea is to get as much air into the cylinder as possible. Having valves that open later or sooner will do nothing to accomplish this, and since the turbocharger is pushing the air in at high presure, the air flow issues at the speeds our engines turn is not that much a factor. Since we can already overboost, there is no restriction to remove to increase performance at this level.
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Old 10-11-2005, 11:25 AM   #6 (permalink)
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Re: 7.3 IDI custom turbo camshaft

Porting and polishing the complete intake and exhaust will help lots. Make the system slippery so the compressed air doesn't "drag" on the passages. You will increase the flow and thats what we need. Faster air in and faster air out. These motors can work with a highly polished intake system unlike a gasser motor. We don't have any fuel going thru the intake manifold . It injects into the precups after compression. [img]/ubbthreads/images/graemlins/smokin.gif[/img]
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Old 10-11-2005, 04:47 PM   #7 (permalink)
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Re: 7.3 IDI custom turbo camshaft

I deffinatly agree with u on that icanfixall. I know more about gas motors then diesel, but a motor is a motor. No matter how the fuel gets ignited. Porting and polishing is a good way to get some extra power. And as far as a cam goes, What would benefit a diesel most is one that holds the valves open for a longer period of time to take advantage of more air even a little more valve lift would be good too. A cam doesent meter air/fuel. Just how much of a shot of that air/fuel mix the cylinder gets. I have seen cams for cummins. And i may be able to dig up cams for a 7.3 as well. unfortunatly from what ive seen these things are around 1000 bucks!! I'll do some research on the cams in all my "diesel parts" website's ive got saved. I know Ive seen them somewhere! [img]/ubbthreads/images/graemlins/confused.gif[/img]
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Old 10-11-2005, 11:39 PM   #8 (permalink)
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Re: 7.3 IDI custom turbo camshaft

I am building a 7.3 with ATS wastgated kit on it . I use Delta cams in Tacoma WA for my cams, Anyhow they said they have a profile that they grind on na engines and the turbos like it too. I am going to have mine done and see what it does. They said the amount is minimal as not to be issues with pushrods. They wouldnt tell me the specs, cant really blame them there. I have used many of thier regroung flat tappet cams and they do all my detroit cams no problems so far.
hope this helps out
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Old 10-12-2005, 12:46 PM   #9 (permalink)
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Re: 7.3 IDI custom turbo camshaft

porting and polishing will help any motor even forced induction because all your boost gauge does is read how much back preasure there is in the intake if you have a big restriction then port and polish it out your boost will drop because now its not holding up air flow but you will have the same volume of air now you can raise your boost this will work untill the back preasure your boost gauge is reading is from stuffing the cylinders with as much air as you can. The custom grind camshaft on ebay was probally for a PSD our motors do not have enough clearence for more lift and too much overlap will hurt on a forced induction motor [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 10-12-2005, 01:02 PM   #10 (permalink)
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Re: 7.3 IDI custom turbo camshaft

there isnt much room to port anything in the 6.9/7.3 cylinder heads.
the ports are large and well laid out and sized, the intake can use some radiusing on the hat flange and thats about it.

the combustion chamber can be modified to lower compression.

the camshft on ebay was custom ground turbo cam for 6.9/7.3 engine and it sold for $289.00 [img]/ubbthreads/images/graemlins/depressed.gif[/img]
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1988 F250 dually All New 7.3 IDI, Banks Sidewinder.
C-6 with GearVendors overdrive 3.55 ring gear
Synthetic SAE 10W-30/SAE 30 Heavy-Duty Motor Oil,
Evans NPG coolant.
AMSOIL ATF in the transmission, AMSOIL gear oil in the diff.
20MPG city 25/28 hwy
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Old 10-12-2005, 01:20 PM   #11 (permalink)
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Re: 7.3 IDI custom turbo camshaft

IDIbuse... Don't shortcut the precups. They can be "opend" up some and the precup chambers in the heads can use some cheanup and polish work to reflect heat. I will be raising my chambers .060 and opening them up some. I had a custom ball end mill ground just for this. Things will-be-a-shinein when there down. Yes... Pictures of before and after are always coming. Everything I do is posted here for everyone to use free of charge as always. The more IDI's I see kicking butt on the PSD's the more I laugh..... [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
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Old 10-12-2005, 01:53 PM   #12 (permalink)
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Re: 7.3 IDI custom turbo camshaft

isnt the prechambers made out of some hard steel, and is part of the fire ring on the head gasket?
the ball end mill is to open up the chamber from the inside?

seems like the combustion chamber side of the precup isnt worth touching due to the sharp edges and small hole, to do anything to that it will be completely changed from oem and I wasnt about to fool with that without a plan.

what part are you going to raise.060? I think I get it.
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C-6 with GearVendors overdrive 3.55 ring gear
Synthetic SAE 10W-30/SAE 30 Heavy-Duty Motor Oil,
Evans NPG coolant.
AMSOIL ATF in the transmission, AMSOIL gear oil in the diff.
20MPG city 25/28 hwy
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Old 10-13-2005, 11:13 AM   #13 (permalink)
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Re: 7.3 IDI custom turbo camshaft

Yes. The precups are made from inconel I think. The small port that the fire flows thru has been opened up and the inside of it have been cleaned up. The ball end mill is used to deepen the chamber in the head because Ford raised the injectors .060 years ago trying to make the motors run cleaner. Darn EPA. If the chambers are all the same, then the power will be balanced betewwn cylinders. My chambers vary from 1.747 to 1.722. When done they will all be the same depth and the same CC size. Each diameter is closer but kinda ruff so they will all be the same when done also. The angle of the precup port will be maintained so the fire will continue its same path, just more will flow thru it during powerstroke. Sorry, I couldn't think of a better word. Yes... The flame suit is on...... [img]/ubbthreads/images/graemlins/vulnerable.gif[/img]
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Old 10-13-2005, 12:44 PM   #14 (permalink)
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Re: 7.3 IDI custom turbo camshaft

It's acceptable with a space.

power stroke.

Not powerstroke. [img]/ubbthreads/images/graemlins/tongue.gif[/img]
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Old 10-13-2005, 01:15 PM   #15 (permalink)
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Re: 7.3 IDI custom turbo camshaft

[img]/ubbthreads/images/graemlins/biggrin.gif[/img] [img]/ubbthreads/images/graemlins/bleh.gif[/img]
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