1993 7.3 IDIT - Delete the turbo, replace injectors and use a fuel pump calibrated for 174HP?

[1991f2504x4]

I'm considering purchasing a 1993 7.3 factory IDIT, deleting the turbocharger, replacing the injectors with N/A units and using a fuel pump calibrated for 174HP @ 3000 RPM?

This engine has keystone piston rings. Is it necessary to use a turbocharger on this configuration to ensure the piston rings seal properly?

Intended use is a marine engine on a 25' boat. Have the full factory marinization kit for marine use from Peninsular Marine including engine mounts, water cooled manifolds, closed cooling heat exchanger, raw water pump.

The thinking here is the beefier internals, larger oil cooler, anodized pistons and Inconel exhaust valves will contribute to increased reliability when running all day @ 2700 RPM.

I intend to go to remote places with the boat so, reliability is paramount.

 

[KansasIDI]

I'm considering purchasing a 1993 7.3 factory IDIT, deleting the turbocharger, replacing the injectors with N/A units and using a fuel pump calibrated for 174HP @ 3000 RPM?

This engine has keystone piston rings. Is it necessary to use a turbocharger on this configuration to ensure the piston rings seal properly?

Intended use is a marine engine on a 25' boat. Have the full factory marinization kit for marine use from Peninsular Marine including engine mounts, water cooled manifolds, closed cooling heat exchanger, raw water pump.

The thinking here is the beefier internals, larger oil cooler, anodized pistons and Inconel exhaust valves will contribute to increased reliability when running all day @ 2700 RPM.

I intend to go to remote places with the boat so, reliability is paramount.

Rock on brother. I see no flaw in your plan. The non turbo version will hold up just fine, the turbo version should hold up even better. I’m never a fan of deleting turbos, but this might just be an exception. I’m sure others will chime in.

There may have been some internal differences with the marine engines, not sure, but I don’t know that I’d worry too much about that.

They probably used a van style oil cooler in boats, once again, no big deal.

Best of luck to you. Hopefully others will chime in.

 

[Black dawg]

What is the reasoning for no turbo?

 

[eacars]

What is the reasoning for no turbo?

running at 3000rpm ? water cooled ?

 

[IDIBOBS]

running at 3000rpm ? water cooled ?

Gonna loose all torques at 3000rpms. Not gonna stay reliable and have longevity doing that. And yes they are all water cooled what does that have to do with the bad choice to run no turbo. These motors do best at 2000or less rpms. By 3k your just burning fuel for no reason.

 

[eacars]

Gonna loose all torques at 3000rpms. Not gonna stay reliable and have longevity doing that. And yes they are all water cooled what does that have to do with the bad choice to run no turbo. These motors do best at 2000or less rpms. By 3k your just burning fuel for no reason.

Yes. I thought 3K rpm was a little much for cruising. I meant fresh water cooling. Wouldn't fresh water marine cooling be a plus for turbos ? I guess no turbo would be less things to go south if cruising to Tahiti mat have been his thinking. idk

 

[eacars]

Rock on brother. I see no flaw in your plan. The non turbo version will hold up just fine, the turbo version should hold up even better. I’m never a fan of deleting turbos, but this might just be an exception. I’m sure others will chime in.

There may have been some internal differences with the marine engines, not sure, but I don’t know that I’d worry too much about that.

They probably used a van style oil cooler in boats, once again, no big deal.

Best of luck to you. Hopefully others will chime in.

I'm considering purchasing a 1993 7.3 factory IDIT, deleting the turbocharger, replacing the injectors with N/A units and using a fuel pump calibrated for 174HP @ 3000 RPM?

This engine has keystone piston rings. Is it necessary to use a turbocharger on this configuration to ensure the piston rings seal properly?

Intended use is a marine engine on a 25' boat. Have the full factory marinization kit for marine use from Peninsular Marine including engine mounts, water cooled manifolds, closed cooling heat exchanger, raw water pump.

The thinking here is the beefier internals, larger oil cooler, anodized pistons and Inconel exhaust valves will contribute to increased reliability when running all day @ 2700 RPM.

I intend to go to remote places with the boat so, reliability is paramount.

What is in the marine package ? Is there a new cam ?

 

[KansasIDI]

I’m guessing his water cooled manifolds couldn’t be properly routed for a turbo.

 

[KansasIDI]

I turn high RPM all the time with 5.13 gears. Yes, it drinks fuel. Yes, it probably results in shorter engine life. But it hasn’t made it unreliable. It’ll be fine.

 

[1991f2504x4]

What is the reasoning for no turbo?

A few reasons for consideration:

Simplicity - A turbocharger is just another component to fail.
Reliability - Marine application requires a water cooled turbo but the real concern is the exposure to salt water environment which seems to reduce turbo service life
Safety - This is a small vessel and I'm not really comfortable with accepting the risks of a turbo fire in the engine compartment

 

[1991f2504x4]

running at 3000rpm ? water cooled ?

Water cooled yes, see marine parts listing below.

Will probably cruise the engine at 2400 - 2700 RPM.

From the emissions label:

"This engine has a primary intended service application as a light heavy-duty diesel engine." With the factory A170 rating, I should be able to run for hours and hours on end at the rated HP/RPM.

Or am I missing something?

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What is in the marine package ? Is there a new cam ?

Marine conversion parts:

- engine mounts
- belt driven raw water cooling pump and bracket
- closed cooling heat exchanger and bracket
- cast water cooled marine manifolds and risers

I'm pretty sure it has the factory stock camshaft but can't say for certain.

I'm interested in knowing if the a different cam profile can change peak torque RPM from 1400 to say 2000 RPM.

 

[1991f2504x4]

Here is the boat.

You must be registered for see images attach

Not shown in the picture is the 1991 F250 IDI 4x4 that tows it.

Truck has only 90,000 miles showing on odometer.

 

[chickenpot]

are we forgetting the idi was actually designed to run against the governer? yes the motor makes the most torque under 2000, sometimes it needs to be wound out like a detroit. lol these motors were in school busses that maxed 55 mph against the governer at 33-3400 rpm. in a marine application where unlimited cooling capacity is available, an NA engine or especially an NA'd turbo block will run full bore for a lot of hours. lack of oil or overheating will be the only things to kill it

 

[rreegg]

I'm interested in knowing if the a different cam profile can change peak torque RPM from 1400 to say 2000 RPM.

I know this is an engine thread but would propellor geometry be able to tune the torque profile?

 

[IDIBRONCO]

I know this is an engine thread but would propellor geometry be able to tune the torque profile?

I know that you can buy different props for different power "settings" on outboards so my guess would be yes.