exhuast manifolds

[Linus Tremaine]

All,
I am wondering if anyone knows the difference between the sIII 2.25 diesel exhaust manifold and the 2.5 diesel exhast manifold.

Thanks

[leafsprung]

yes

[Linus Tremaine]

ike you pest!

I think I have figured out what to do but Jeff told me that the engine in this thing was a 2.5 which I have decided that it is not. What I cant decide is if he has put a 2.5 head on it and since the intake manifold is different for a 2.25 vs a 2.5..... They look exactly the same in the pictures I have found, but the part number is different.

you should have driven the REO to mendo.

[leafsprung]

intake manifolds are different one is 180 deg bend, one is 45 deg

[Linus Tremaine]

I meant exhaust

The part numbers for the exhaust manifold for a 2.25 and a 2.5 are different.

I think that jeff put a 2.5 head on the engine because I know he had to get it from canada and that he thought the engine was a 2.5. So, I am trying to determine what the actual difference in the exhaust manifolds is because I cant tell from the pictures that I have seen.

Make sense?!?!?

Of course, I dont actually know if a 2.5 head would even fit on the 2.25 block, but the information that I got when I purchased the truck has put the idea in my head that SOMETHING is different. I just dont know what.

[SafeAirOne]

If the comparison pics all look the same, then it might be the outlet size. The 2.5 was meant for a 2" exhaust downpipe and uses 3 studs on the outlet, whereas... I have no idea what the 2.25 has for an outlet, but generally they are all piped with 1.75" exhaust systems.

I can post pics of my 2.5 manifold (removed) if you need.

[leafsprung]

the 2.25 exhaust goes out the fender, the 2.5 goes down between the frame and motor. intake and exhaust manifolds are different.