Engine/Transmission (1994 - 1998) Removing muffler

[Neibe]

Can removing the muffler hurt the motor a friend of mine at work has a 92 Ford diesel and it has 200,000 miles on it. Had it at the repair shop they told him he has 2 bad cylinders a bad injector and a valve is shot. His Dad says it is because he removed his muffler and there isn't any back pressure on the motor. I figure 200,000 in a Ford 7. 3 non-turbo is pretty good.

 

[bmoeller]

On a turbocharged engine, it won't hurt the engine. The turbo creates enough back pressure. Since his is naturally-aspirated, it can hurt them. Why, I don't know. No one has ever given me a straight answer. Most I've heard, it causes burnt valves.

 

[Forrest Nearing]

it can cause a burnt valve if you run open manifolds or no manifolds at all, but the lack of a muffler isn't going to cause any problems... look at damn near every race car on earth... no mufflers for the most part...



Forrest

 

[JGheen]

the lack of a muffler isn't going to cause any problems... look at damn near every race car on earth... no mufflers for the most part...



Forrest

I'll second that comment. I have never seen a muffler on any race car, except for maybe an SCCA car. All them Top Fuel drag racers to open wheel indy cars never run mufflers, they just want to get the air/fuel into the engine and out as fast and efficent as possible, and a muffler is an unnecessary restriction.

Pull your muffler off and run it. The turbo is a muffler and any back pressure reduced to it will definatley help spool up and the engines ability to breath. Sounds awesome too.

Never really heard anyone say running no muffler on any engine will harm it, thats a new one on me.

 

[mechanic]

Can removing the muffler hurt the motor a friend of mine at work has a 92 Ford diesel and it has 200,000 miles on it. Had it at the repair shop they told him he has 2 bad cylinders a bad injector and a valve is shot. His Dad says it is because he removed his muffler and there isn't any back pressure on the motor. I figure 200,000 in a Ford 7. 3 non-turbo is pretty good.

A long time ago it was thought that running an engine without exhaust pipes (Pipes that connect to the exhaust manifolds) would cause the valves to warp when you turn the engine off when it is hot. In 42 years as an auto mechanic, I have never

seen this happen, although I have not seen many case in which engines were run

that way since it is not legal. I suspect that most of the cases where that happened was because the valves were already getting to the end of their life and / or with the headers open and no tach ( Who could afford one in 1950) they over-reved the engines and floated the valves causing them to fail. If they ran the engine without a manifold, it is possible that they could damage the valves. In the case you sighted, I thought that in 92 Ford had already switched to the Powerstroke or at least the 7. 3 turbo. If I am correct, then the turbo would prevent any possibility of valve damage. Tell your friend to get serious and get a real truck, something with a Ram on the front and a Cummins Turbo Diesel emblem on the door.

 

[mechanic]

Sorry, I didn't know that the ID had to be entered.

Mechanic, 94 Ram 2500 SLT, std. everything, no mods except dowel pin stabilized, and no cat of muffler. Although I did modify the trans cooler lines to connect with flare fittings, a lot less money then buying the new setup from a dealer. If their is interest I will detail how to do the job. Contact me at -- email address removed --

 

[ndurbin]

PSDs didn't start till 1994. I dont remember exactly when they switched to the NA 7. 3s from the 6. 9s but I think it was around 1990 (not real sure).



Nathan

 

[mechanic]

PSDs didn't start till 1994. I dont remember exactly when they switched to the NA 7. 3s from the 6. 9s but I think it was around 1990 (not real sure).



Nathan

You may be correct about the PSD's starting in 94. But the 7. 3 Non-turbo came of age somewhere in the middle 80's. In the early 90's serviced an 87 one ton for a friend / customer. I reread the question post and this time I caught the Non-turbo statement, sorry I didn't see it the first time. And yes, 200,000 on a truck with the blue oval and the F word on it is a pretty good life, but just look at what he could have done with a Cummins.

Mechanic.

 

[mechanic]

Either it is to late for me to be doing this, or the great electronic maze is messing with me, I thought I lost the first try of the last post but it surfaced after I reentered it. Forgive all this trial and error at getting the posts entered. I am still learning the ropes of doing this.

Mechanic

 

[ndurbin]

I dont have to much against Fords. They've left me stranded alot less than my dodge has. Ford just dont have it together in the diesel department.



Nathan

 

[Neibe]

In 94 only the manual transmission had the PSD the auto's were turbo and not a PSD. His 92 is a non-turbo 7. 3.

 

[Rattlin_Ram]

'83 was the first model year for the 6. 9l ford IDI/NA



'88 was the first model year for the 7. 3l ford IDI/NA



I THINK 91 or 92 was the first model year for the 7. 3l ford IDI/Turbo (now that I think about it I'm pretty sure it was '92, they said just TURBO DIESEL on the side and where the newer rounded body style rather than the flat front)



'94 was the first model year for the 7. 3l PSD DI/Turbo

 

[dtygart]

I added a ATS turbo to my 84 Ford 6. 9 and at that time removed the muffler-350k miles now-just added a stub pipe after the ex manifolds y'ed together-sounds great under power, has a nasty "Brrrapp" downhill or off throttle at high speeds. 96 TDR lost its cat and muffler; short pipe that comes out in front of the duals.

 

[DJb]

I dont have to much against Fords. They've left me stranded alot less than my dodge has. Ford just dont have it together in the diesel department. Nathan

Never owned a Ford truck but after having some cars that broke, I probably won't ever own a Ford again lol. I've had a few breakdowns over the years with ChryCo products but was alway able to get going again... . can't say that for the Fords. I do have to say that the breakdowns were very few with both brands tho.