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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 10-15-2005, 07:27 PM   #1 (permalink)
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supercharger 6-71 on a 6.9?

Just wondering if anybody has played with the idea of installing a
6-71 or similar supercharger/blower on a 7.3 or 6.9? if so, could you please tell me power gains and/or problems
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Old 10-15-2005, 09:09 PM   #2 (permalink)
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Re: supercharger 6-71 on a 6.9?

It's probably been done, but I've never heard of it here.
It wouldn't be practical, especially for a daily driver.
The main problem with that setup would be low efficiency. With a mechanical supercharger, you don't have a method of varying the boost according to the load on the engine. At any given rpm, you would have a set amount of boost (and parasitic power loss), regardless of load on the engine. That would not be conducive to good fuel economy.
The beauty of a turbocharger is that it develops boost according to the load on the engine.
I'm not saying this to rain on your parade. I actually considered a mechanically driven supercharger for my 7.3 until I realized that the negatives outweighed the positives. (AND the fact that bolt-on turbo kits are readily available.) [img]/ubbthreads/images/graemlins/cool.gif[/img]
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Old 10-15-2005, 09:18 PM   #3 (permalink)
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Re: supercharger 6-71 on a 6.9?

A supercharger on a diesel is best for engines that see a constant load, like in a boat or even a generator or pump. Detroit diesels had them because they were 2 stroke's, but for everyday driving it would probably negat the benefits. Now if you installed 1 small supercharger and a turbo(like VOLVO) you would have o.k. efficiency and unbelievable throttle response. Just my opinion.
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Old 10-15-2005, 11:20 PM   #4 (permalink)
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Re: supercharger 6-71 on a 6.9?

Somebody posted a picture of one on ebay once but as I recall it was all for show. If you are dead set on it go for it but the efficiency will be ruined and it won't be reliable.

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Old 08-08-2006, 06:22 PM   #5 (permalink)
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Re: supercharger 6-71 on a 6.9?

Question.... If a screw type supercharger with bypass valve was used.... Under braking or no throttle the "whipple would not stuff the engine with that extra air, only when you pressed the pedal would the valve close and boost be brought back up... RIGHT?

The hardest part about that is getting enough fuel for max throttle...... without having too much fuel at low idling rpm.
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Old 08-08-2006, 07:58 PM   #6 (permalink)
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Re: supercharger 6-71 on a 6.9?

[ QUOTE ]
Question.... If a screw type supercharger with bypass valve was used.... Under braking or no throttle the "whipple would not stuff the engine with that extra air, only when you pressed the pedal would the valve close and boost be brought back up... RIGHT?

[/ QUOTE ]

I'm not all that familiar with screw type air compressors, however they are gaining popularity in industrial settings I think, but I believe they still run much more efficient at constant load than variable.

[ QUOTE ]
The hardest part about that is getting enough fuel for max throttle...... without having too much fuel at low idling rpm.

[/ QUOTE ]

No, the injection pump varies the amount of fuel as much or as little as you want. I now know that if you want even more fuel you can add two pumps.

Birken
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Old 08-09-2006, 02:54 PM   #7 (permalink)
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Re: supercharger 6-71 on a 6.9?

[ QUOTE ]
It's probably been done, but I've never heard of it here.
It wouldn't be practical, especially for a daily driver.
The main problem with that setup would be low efficiency. With a mechanical supercharger, you don't have a method of varying the boost according to the load on the engine. At any given rpm, you would have a set amount of boost (and parasitic power loss), regardless of load on the engine. That would not be conducive to good fuel economy.
The beauty of a turbocharger is that it develops boost according to the load on the engine.
I'm not saying this to rain on your parade. I actually considered a mechanically driven supercharger for my 7.3 until I realized that the negatives outweighed the positives. (AND the fact that bolt-on turbo kits are readily available.) [img]/ubbthreads/images/graemlins/cool.gif[/img]

[/ QUOTE ]

Actually the RPM of the engine combined with the pulley ratio will determine how much boost is generated throughout the RPM curve. Problem with a diesel is we have low RPMs and most superchargers are built of higher RPM'ed gas motors. You would need a big pulley to get #10 of boost at 3400 RPMs.
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Old 08-09-2006, 04:54 PM   #8 (permalink)
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Re: supercharger 6-71 on a 6.9?

Don't you mean a SMALL pulley? [img]/ubbthreads/images/graemlins/smokin.gif[/img]
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Old 08-09-2006, 09:33 PM   #9 (permalink)
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Re: supercharger 6-71 on a 6.9?

How bout big on bottom, small on top,...........that'd Git_R_Done! [img]/ubbthreads/images/graemlins/wink.gif[/img]
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Old 08-09-2006, 09:45 PM   #10 (permalink)
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Re: supercharger 6-71 on a 6.9?

[ QUOTE ]
...Actually the RPM of the engine ...

[/ QUOTE ]

The superchargers I'm familiar with make boost essentially independent of RPM -- that's the whole idea. It's a positive-displacement pump that turns when the engine turns. It essentially makes the engine pump as much air as a much larger engine, but it does it all the time, not just when you're on the skinny pedal.
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Old 08-09-2006, 09:48 PM   #11 (permalink)
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Re: supercharger 6-71 on a 6.9?

[ QUOTE ]
... I now know that if you want even more fuel you can add two pumps...

[/ QUOTE ]

I'd love to have a mechanically-injected engine that makes upwards of 400 rwhp.

What's the story on dual injection pumps?
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Old 08-09-2006, 10:51 PM   #12 (permalink)
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Re: supercharger 6-71 on a 6.9?

He means dual injection SUPPLY pumps. (i.e. 2 lift pumps, or Holley red pumps.)

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Old 08-10-2006, 09:46 AM   #13 (permalink)
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Re: supercharger 6-71 on a 6.9?

No I mean dual injection pumps. Not long ago on this board somebody posted to a link of a 6.5 tractor puller who had two IPs plumbed together.

Definitely not easy, and probably not reliable, but I'm sure the power is good.

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Old 08-22-2006, 01:30 PM   #14 (permalink)
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Re: supercharger 6-71 on a 6.9?

Just a question, but were both pumps for fuel? I only ask because a tractor puller friend of mine uses dual injector pumps, but one is for fuel while the other is for pressure injecting water.

I saw a truck in 4Wheel&Off-Road magazine that was a 6.9 with a 6-71 blower. It was just a reader's rides bit, but perhaps you could chase him down via the reader's rides section of the website. Just a thought.

Jeremy
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Old 08-22-2006, 08:26 PM   #15 (permalink)
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Re: supercharger 6-71 on a 6.9?

Yes two injection pumps both injecting fuel at the same time, he showed how he could shut each of them off and the engine still ran.

I think that readers ride you saw actually was just for looks, I have heard reference to that before and it apparently does not make any boost, or it might even be just a shell.

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