Hello All,
I'm in the process of R-n-R'ing the 5432 in my E38 with a used engine. In the process of removing the engine several other things are receiving attention including the exhaust system.
Currently the exhaust leaves the engine from a 2" OD water mix elbow, travels about 10" of hose, and is necked down to a combination NPT street 90* fitting/nipple setup, then to another 10" section of hose to the waterlift muffler. The NPT street 90* setup is at best 1 1/8" internally and the waterlift muffler inlet is 1 1/2" as is the rest of the system. This system looks pretty restrictive, especially the 2" to 1 1/8" combination reduction/90* corner.
I am considering replacing the waterlift muffler and ALL piping with 2" throughout. There are numerous combinations of parts that will allow this. The result should be a happier engine with a lot less backpressure. Less backpressure should mean lower temps and slightly more power. IIRC, Universal's M40 engine which is basically the same as the 5432 has the larger 2" system from the start. The other justification for this is simply the hoses need replacing anyway.
What say the crowd? Seems reasonable and easy to me.
RT
I'm in the process of R-n-R'ing the 5432 in my E38 with a used engine. In the process of removing the engine several other things are receiving attention including the exhaust system.
Currently the exhaust leaves the engine from a 2" OD water mix elbow, travels about 10" of hose, and is necked down to a combination NPT street 90* fitting/nipple setup, then to another 10" section of hose to the waterlift muffler. The NPT street 90* setup is at best 1 1/8" internally and the waterlift muffler inlet is 1 1/2" as is the rest of the system. This system looks pretty restrictive, especially the 2" to 1 1/8" combination reduction/90* corner.
I am considering replacing the waterlift muffler and ALL piping with 2" throughout. There are numerous combinations of parts that will allow this. The result should be a happier engine with a lot less backpressure. Less backpressure should mean lower temps and slightly more power. IIRC, Universal's M40 engine which is basically the same as the 5432 has the larger 2" system from the start. The other justification for this is simply the hoses need replacing anyway.
What say the crowd? Seems reasonable and easy to me.
RT