Head Removal for gas flow.
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MBWorld Fanatic!
Joined: Jul 2005
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From: London, UK
No longer stock '06 E55, A3 3.2 Quattro, GLE 400d, R107 280SL, Golf Polo
Head Removal for gas flow.
I am considering removing the heads for a gas flow mod...
Anything to be conscious of for head removal other than the obvious cautions?
Any guidelines for bolt torque and sequencing?
TIA
Anything to be conscious of for head removal other than the obvious cautions?
Any guidelines for bolt torque and sequencing?
TIA
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Joined: Oct 2009
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From: Southern California
E55 w/ goods, Z32 Project underway
Very easy motor to work on, just be cognitive of what you already stated. Since you have them off, I would just do the obvious things as valve job ,seals, etc.... A few here have had some flow work done on theirs, not sure if their willing to share any secrets with you. The heads are nothing special and I'm sure any competent head machinist with the proper equipment can get some nice flow out of them. Not as if there is only one good machinist in the country. 
Thread Starter
MBWorld Fanatic!
Joined: Jul 2005
Posts: 3,174
Likes: 19
From: London, UK
No longer stock '06 E55, A3 3.2 Quattro, GLE 400d, R107 280SL, Golf Polo
Many specialists in the UK at this and one shop I found does incredible work but crumbs they are not cheap....Around $3k equivalent. 
Luckily they have already mapped this head and done a set before and achieved 18% increase in flow. All CNC programmed and cut, as well as taped finishing.
Kleemann claim 5-8% power increase, so thats 30-50 HP depending on your baseline, not shabby at all. But the Kleemann dyno shows massive gains low down in torque based on their 168 pulley. I would not have expected such a big gain in torque low down but more at top with this mod...?
What about a tune I assume a higher flowing head would lean you out some?
Also I assume a flowed head would suit the 180mm pulley better than a 168mm?
Would I see a drop in boost? ... as we know not necesarily a bad thing.
Not sure about doing all the other bits as car only has 16500 Miles on it...........
If I do the mod, I will document it for all....
Luckily they have already mapped this head and done a set before and achieved 18% increase in flow. All CNC programmed and cut, as well as taped finishing.
Kleemann claim 5-8% power increase, so thats 30-50 HP depending on your baseline, not shabby at all. But the Kleemann dyno shows massive gains low down in torque based on their 168 pulley. I would not have expected such a big gain in torque low down but more at top with this mod...?
What about a tune I assume a higher flowing head would lean you out some?
Also I assume a flowed head would suit the 180mm pulley better than a 168mm?
Would I see a drop in boost? ... as we know not necesarily a bad thing.
Not sure about doing all the other bits as car only has 16500 Miles on it...........
If I do the mod, I will document it for all....
Last edited by stevebez; Oct 15, 2011 at 05:48 PM.
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Eurocharged Performance ML63 and TT lambo
Very easy motor to work on, just be cognitive of what you already stated. Since you have them off, I would just do the obvious things as valve job ,seals, etc.... A few here have had some flow work done on theirs, not sure if their willing to share any secrets with you. The heads are nothing special and I'm sure any competent head machinist with the proper equipment can get some nice flow out of them. Not as if there is only one good machinist in the country.
Many specialists in the UK at this and one shop I found does incredible work but crumbs they are not cheap....Around $3k equivalent.
Luckily they have already mapped this head and done a set before and achieved 18% increase in flow. All CNC programmed and cut, as well as taped finishing.
Kleemann claim 5-8% power increase, so thats 30-50 HP depending on your baseline, not shabby at all. But the Kleemann dyno shows massive gains low down in torque based on their 168 pulley. I would not have expected such a big gain in torque low down but more at top with this mod...?
What about a tune I assume a higher flowing head would lean you out some?
Also I assume a flowed head would suit the 180mm pulley better than a 168mm?
Would I see a drop in boost? ... as we know not necesarily a bad thing.
Not sure about doing all the other bits as car only has 16500 Miles on it...........
If I do the mod, I will document it for all....
Luckily they have already mapped this head and done a set before and achieved 18% increase in flow. All CNC programmed and cut, as well as taped finishing.
Kleemann claim 5-8% power increase, so thats 30-50 HP depending on your baseline, not shabby at all. But the Kleemann dyno shows massive gains low down in torque based on their 168 pulley. I would not have expected such a big gain in torque low down but more at top with this mod...?
What about a tune I assume a higher flowing head would lean you out some?
Also I assume a flowed head would suit the 180mm pulley better than a 168mm?
Would I see a drop in boost? ... as we know not necesarily a bad thing.
Not sure about doing all the other bits as car only has 16500 Miles on it...........
If I do the mod, I will document it for all....
Yes, your lean, yes you will drop boost and a bigger pulley is that much better.
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Joined: Mar 2008
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From: ny
2019 s560 sedan
i would figure if the heads are off you should also send out the intake manifold for some port matching as well . Use to do this on the fox body 302 mustangs for some nice power increases as well.
Thread Starter
MBWorld Fanatic!
Joined: Jul 2005
Posts: 3,174
Likes: 19
From: London, UK
No longer stock '06 E55, A3 3.2 Quattro, GLE 400d, R107 280SL, Golf Polo
Hmm port matching the inlets means sending the S/C in as well ... would be nice but think thats mbe something I could tidy up.
They will port match the kleemann headers foc so at least thats a help....
Suppose a 82 TB upgrade makes sense...
Gosh this little project is adding up, but need to be prepared for the Evosport Intercoolers!!!!!
They will port match the kleemann headers foc so at least thats a help....
Suppose a 82 TB upgrade makes sense...
Gosh this little project is adding up, but need to be prepared for the Evosport Intercoolers!!!!!
Thread Starter
MBWorld Fanatic!
Joined: Jul 2005
Posts: 3,174
Likes: 19
From: London, UK
No longer stock '06 E55, A3 3.2 Quattro, GLE 400d, R107 280SL, Golf Polo
Chaps where would I find the re/re for heads in WIS?
I have WIS it but its a friggin minefield.....
I have WIS it but its a friggin minefield.....
