marc.l
Active Member
- Joined
- Feb 25, 2007
- Messages
- 258
- Car
- E55 wagon
Been looking at s/steel exhaust headers for a while and those in the no ( thanks savman) have come to the same conclusion , with RHD cars we have very limited choice.
In the past I've been using a semi retired guy to do the odd welding job on a few other projects and last time I spoke to him discovered that he has spent most of his working life building specialist exhaust manifold and exhausts for the racing teams and was highly regarded in the industry for making two stroke expansion chambers working for most of the big motor cycle racing teams from the 60's onwards . This morning he came over to look at making me a custom manifold for the E55 . His knowledge and understanding of exhaust systems was quite remarkable . He's took all the details and I gave him a list and pictures of all the currently available manifolds I could find including fab floored , kleemann, super sprint , mbh and a couple of others .
Just got of the phone to him and he's not had one good thing to say about any of them , so thought I would run this through with the knowledgeable people on here before I follow his advice ....
His first concern was the size of the primary tubes that after market manufactures use , any thing from 1 5/8 to 1 7/8 he thinks they are way to large and slowing the exhaust gasses down
His second was the x pipe arrangement , fully crossing both banks , he states that rather than x pipe all you need to do is cross over the middle two cylinder on bank one and two , keep them Seperated but in to the opposite bank , his argument being that all the exhaust pulses would be 180 degrees apart .
His best design or his recommended design is a four in to two , with the front and rear cylinders on each bank going two into the one and the middle cylinder primary's going two into one but the crossing under the car and joining the two into the two into one collector from the front and rear cylinder from the opposite bank .
Any one any idea what he means by exhaust pulses at 180 degrees apart ? Any merit in his advise ?
In the past I've been using a semi retired guy to do the odd welding job on a few other projects and last time I spoke to him discovered that he has spent most of his working life building specialist exhaust manifold and exhausts for the racing teams and was highly regarded in the industry for making two stroke expansion chambers working for most of the big motor cycle racing teams from the 60's onwards . This morning he came over to look at making me a custom manifold for the E55 . His knowledge and understanding of exhaust systems was quite remarkable . He's took all the details and I gave him a list and pictures of all the currently available manifolds I could find including fab floored , kleemann, super sprint , mbh and a couple of others .
Just got of the phone to him and he's not had one good thing to say about any of them , so thought I would run this through with the knowledgeable people on here before I follow his advice ....
His first concern was the size of the primary tubes that after market manufactures use , any thing from 1 5/8 to 1 7/8 he thinks they are way to large and slowing the exhaust gasses down
His second was the x pipe arrangement , fully crossing both banks , he states that rather than x pipe all you need to do is cross over the middle two cylinder on bank one and two , keep them Seperated but in to the opposite bank , his argument being that all the exhaust pulses would be 180 degrees apart .
His best design or his recommended design is a four in to two , with the front and rear cylinders on each bank going two into the one and the middle cylinder primary's going two into one but the crossing under the car and joining the two into the two into one collector from the front and rear cylinder from the opposite bank .
Any one any idea what he means by exhaust pulses at 180 degrees apart ? Any merit in his advise ?
