Project ___PTE___
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From: S.E. FLA.
05 ML-500 , 03 CLK5.5 AMG has left the Garage
Project ___PTE___
I watch the forum & read it daily. My car is a 2003 CLK 5.5 AMG I've got the heads off it & porting them. Spent some time in front of a Flow bench trying to measure the stock Flow in CFM.
I found the intake side pretty good. 146 CFM @ .500 valve lift . The exhaust is not to bad. 104 CFM @ .500 Valve lift. That is 70% as spec ratio Exhaust to Intake flow. That's what we like to see for a performance N/A engine for street use. And keep the emissions to Federal US EPA specs.
My next move is to increase both and try to keep to the 70% ratio . The exhaust port in this motor & your blower motor are the same. They have a large protrusion on both sides , in the bowl area that restricts the out going exhaust flow.These protrusions are there to make internal space for the twin spark plugs. Attached is the Finish Porting Numbers & Flow chart. The exhaust went from 104 CFM @ .500 valve lift too 121.7 CFM @ .500 valve lift. The intake went from 149 CFM @ .500 valve lift , too 187.7 CFM @ .500 valve lift. The valves are the OEM ,that came in the heads.
I'm also working on installing gauges on a panel that fits in the space just below the radio. I do not have a Nav unit so that area is just for glove & such stuff. One gauge will be Vacuum & Boost , the other will be air temp In the blower housing. Chris @ C2Design. Is working with me on a Kleemann blower set up. Now you know why I've been quiet
I found the intake side pretty good. 146 CFM @ .500 valve lift . The exhaust is not to bad. 104 CFM @ .500 Valve lift. That is 70% as spec ratio Exhaust to Intake flow. That's what we like to see for a performance N/A engine for street use. And keep the emissions to Federal US EPA specs.
My next move is to increase both and try to keep to the 70% ratio . The exhaust port in this motor & your blower motor are the same. They have a large protrusion on both sides , in the bowl area that restricts the out going exhaust flow.These protrusions are there to make internal space for the twin spark plugs. Attached is the Finish Porting Numbers & Flow chart. The exhaust went from 104 CFM @ .500 valve lift too 121.7 CFM @ .500 valve lift. The intake went from 149 CFM @ .500 valve lift , too 187.7 CFM @ .500 valve lift. The valves are the OEM ,that came in the heads.
I'm also working on installing gauges on a panel that fits in the space just below the radio. I do not have a Nav unit so that area is just for glove & such stuff. One gauge will be Vacuum & Boost , the other will be air temp In the blower housing. Chris @ C2Design. Is working with me on a Kleemann blower set up. Now you know why I've been quiet
Last edited by PTE; Mar 26, 2007 at 08:53 PM.
Thread Starter
MBWorld Fanatic!
Joined: Jul 2005
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From: S.E. FLA.
05 ML-500 , 03 CLK5.5 AMG has left the Garage
Even More Pictures
Thanks, Please note the exhaust. I opted not to open them up to match the gasket or the headers. I did not want to create an over scavenge to the combustion chamber, & I stayed with the OEM stock size valves
Last edited by PTE; Mar 26, 2007 at 09:33 PM.
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Thread Starter
MBWorld Fanatic!
Joined: Jul 2005
Posts: 1,224
Likes: 6
From: S.E. FLA.
05 ML-500 , 03 CLK5.5 AMG has left the Garage
specs for Valve springs
As engineering Buddys, we like to post true numbers , on any changes we have made, We may not know when to come in out of the rain, 
It is our focus & dedication to record true facts at the best of our capibility. So we may have some repetibility on Our Mods. Although I did not go as full out as others on the porting. I did post some flow bench Numbers. We also used a (J)tip on the end of the probe, As recommended By Jim McFarland & Smokey Yunick.
Well Todays post is the Valve spring height assy & pressures . Happy Motoring from the SCHOOL OF HARD KNOCKS ___PTE___
It is our focus & dedication to record true facts at the best of our capibility. So we may have some repetibility on Our Mods. Although I did not go as full out as others on the porting. I did post some flow bench Numbers. We also used a (J)tip on the end of the probe, As recommended By Jim McFarland & Smokey Yunick. Well Todays post is the Valve spring height assy & pressures . Happy Motoring from the SCHOOL OF HARD KNOCKS ___PTE___
Last edited by PTE; Apr 27, 2007 at 01:01 PM.
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From: Mia
2005 E 55
