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MBWorld Fanatic!
Joined: Apr 2006
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From: Bay Area, CA
98 C43, 15 Alfa 4C LE, 18 Tesla Model 3 DM Perf, 08 Duc S1000, 02 Duc 998, 98 Duc 748, 01 Miata
You should probably post that over at Club202 or in the W202 non-AMG section of the board. Everyone here has either the 4.3 or 3.6.
MBWorld Fanatic!
Joined: Feb 2005
Posts: 5,761
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From: North Carolina
98 Black C43 , 12’ ML 350 Blutec
Super Member
Joined: Apr 2002
Posts: 592
Likes: 0
From: Sacramento
AMG C43, 1999
If your going to keep your 2.8 engine I would look at getting some lighter and larger valves for the head. Use the E55 valve springs and get some smaller diameter valve guides machined. By getter a larger valve in the head you can flow more air and by using a lighter valve you can rev and engine up higher.
Make sure the piston to head clearance is no more than 0.040". Anything more and it slows the burn rate of the cylinder down and you have to use more timinig to make power. The less timing you need the better or more effiecent your motor is running.
I would lighten the crank by having the outer diameter of the crank taken off. And I would find some lighter rods and pistons. Deck the head to up compression to 11:1. Only have the ports cleaned up to remove casting marks and then find someone who can do a really good valve job with your new parts. A really good motor should make about 85 ft-lbs of torque per 1000cc. So your 2.8 can make up to around 238 ft-lbs of torque and if this is made at say 5500 rpm (your max torque peak) then you can make aournd 250Hp out of you motor at 5500 prm. With the new parts find someone who can raise your rev limit to say around 7000 to 7500 rpm to take advantage of the lighter valves and pistons. At 7000 rpm if your engine can make around 225 ft-lbs of torque you would then make 300 Hp.
The next thing to do to really make a difference is get light wheels. You can get 17x9.5" wheels that weight only 15 -16 lbs each and that will make a big change. Remove all the things that are heavy. I removed 250 lbs off my 1st W202 a 1999, C280 and it really made a difference in the way it went and handled.
Make sure the piston to head clearance is no more than 0.040". Anything more and it slows the burn rate of the cylinder down and you have to use more timinig to make power. The less timing you need the better or more effiecent your motor is running.
I would lighten the crank by having the outer diameter of the crank taken off. And I would find some lighter rods and pistons. Deck the head to up compression to 11:1. Only have the ports cleaned up to remove casting marks and then find someone who can do a really good valve job with your new parts. A really good motor should make about 85 ft-lbs of torque per 1000cc. So your 2.8 can make up to around 238 ft-lbs of torque and if this is made at say 5500 rpm (your max torque peak) then you can make aournd 250Hp out of you motor at 5500 prm. With the new parts find someone who can raise your rev limit to say around 7000 to 7500 rpm to take advantage of the lighter valves and pistons. At 7000 rpm if your engine can make around 225 ft-lbs of torque you would then make 300 Hp.
The next thing to do to really make a difference is get light wheels. You can get 17x9.5" wheels that weight only 15 -16 lbs each and that will make a big change. Remove all the things that are heavy. I removed 250 lbs off my 1st W202 a 1999, C280 and it really made a difference in the way it went and handled.
Last edited by speedybenz; Nov 18, 2009 at 07:41 PM.
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MBWorld Fanatic!
Joined: Jul 2005
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From: S.E. FLA.
05 ML-500 , 03 CLK5.5 AMG has left the Garage
w 202 stuff
Good stuff Jeff, It all works & helps get the car down the road , Plus it helps this guy's project. It is his dream to make this car work & you helped . Thanks for the advice , I will use some of it my self. Cheers ___PTEngineering
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Thread Starter
Senior Member
Joined: Sep 2008
Posts: 292
Likes: 1
From: Inverness,Fl (Near Ocala)
97 C28
Thanks Jeff I apreaciate everything and will do this in a step by step process.. This 202 is CLEAN the shell is perfect I mean CLEAN!! I'm not looking to race just have a long living 202 with a bit more power and like dude said before me I want a project.. Its my first 1 so...Like Model kits cars when we were kids this is my first I"ll end up buying another one next year to park besides this one.cars are getting cheaper these days but when i buy i'm looking for grand daddy caddy u know what I mean MAYNE...
later....
later....
Super Member
Joined: Apr 2002
Posts: 592
Likes: 0
From: Sacramento
AMG C43, 1999
If I were to aim at picking up some Hp and didn't want to spend too much time and money at it then I would shoot for the following:
Mill the head to increase compression to 11:1
Set the Piston to Head Clearance at 0.035" to 0.040"
Clean up the ports but do not increase the the size.
Get a good valve job that moves the 45 degree angle out as far as possible in the valve seat to increase the airflow.
Use a multi-layer steel head gasket and maybe remove one layer to help get the deck height set.
Clean-up any sharp areas in the combustion chamber to help keep detonation down.
Make sure the valves are cut correctly, i.e. check out Smoky Yunicks "Power Secrets" it is a great book with all the basic engine knowledge in one place.
Use new valve springs when you rebuild. The old ones may measure out to the right spring tension, but they won't have the snap of new ones so the engine will not feel as sharp without new valve springs.
Clean everything twice.
have a good trque wrench and use it and also use a very good assembly lube like Redline.
Jeff
Mill the head to increase compression to 11:1
Set the Piston to Head Clearance at 0.035" to 0.040"
Clean up the ports but do not increase the the size.
Get a good valve job that moves the 45 degree angle out as far as possible in the valve seat to increase the airflow.
Use a multi-layer steel head gasket and maybe remove one layer to help get the deck height set.
Clean-up any sharp areas in the combustion chamber to help keep detonation down.
Make sure the valves are cut correctly, i.e. check out Smoky Yunicks "Power Secrets" it is a great book with all the basic engine knowledge in one place.
Use new valve springs when you rebuild. The old ones may measure out to the right spring tension, but they won't have the snap of new ones so the engine will not feel as sharp without new valve springs.
Clean everything twice.
have a good trque wrench and use it and also use a very good assembly lube like Redline.
Jeff
Thread Starter
Senior Member
Joined: Sep 2008
Posts: 292
Likes: 1
From: Inverness,Fl (Near Ocala)
97 C28
find someone who can raise your rev limit to say around 7000 to 7500 rpm to take advantage of the lighter valves and pistons.---In this phrase i have a question is this done by a tuner..? Tuning the ECU?
Last edited by $tallion; Nov 23, 2009 at 02:40 PM. Reason: cause
