[nrphlly]

can anyone tell me if this is a clean swap or if this will require some modification. thankyou.

 

[dlbehrns]

MB put a 43amg in a C but I have never read anything on the w208 about a swap.

 

[nrphlly]

thanks

MB put a 43amg in a C but I have never read anything on the w208 about a swap.

Im either gonna do this or try something else. I would like to naturally aspirite the car as opposed to heavy mods. I did the B10 kit already.

the plan is to have CLK55AMG and a CLK43AMG (from the C43).

 

[MarcusF]

Hey Philly, this was looked at here.

You already have the larger throttle body (2001 and later CLK430s got the CLK55 sized TB), so you don't have to deal with the C43 ME 2.0 TB connection that won't fit.

Basically, you just want the cams. Maybe the injectors, but you may want to wait and see if you run lean first (doubtful). Did I mention the roof of the exhaust ports on a C43 head have been "massaged"?

 

[Hary Gahtoe]

Hey Philly, this was looked at here.

You already have the larger throttle body (2001 and later CLK430s got the CLK55 sized TB), so you don't have to deal with the C43 ME 2.0 TB connection that won't fit.

Basically, you just want the cams. Maybe the injectors, but you may want to wait and see if you run lean first (doubtful). Did I mention the roof of the exhaust ports on a C43 head have been "massaged"?

Something isn't right here. C43 motors have higher CR than 430 engines.
That means different pistons.
Heads, that's news about massaged ports.
The 3 valve motor don't make power like; even a new Mustang GT. If your minds set on your CLK do a hybrid. Keep your block, have it rebored. Put in
aftermarket 55 pistons, massage the heads, get your 430 cams reground, put 55 aftermarket pistons in that thing. I'd put that setup against a 55

 

[nrphlly]

hey hary

Something isn't right here. C43 motors have higher CR than 430 engines.
That means different pistons.
Heads, that's news about massaged ports.
The 3 valve motor don't make power like; even a new Mustang GT. If your minds set on your CLK do a hybrid. Keep your block, have it rebored. Put in
aftermarket 55 pistons, massage the heads, get your 430 cams reground, put 55 aftermarket pistons in that thing. I'd put that setup against a 55

so basically you want me to rework my current block. If I go that route, is a 55 engine swap not easier to do and less costly as well. Id have to trust someone to play around in that block and do this work for me.

 

[nrphlly]

Hey Philly, this was looked at here.

You already have the larger throttle body (2001 and later CLK430s got the CLK55 sized TB), so you don't have to deal with the C43 ME 2.0 TB connection that won't fit.

Basically, you just want the cams. Maybe the injectors, but you may want to wait and see if you run lean first (doubtful). Did I mention the roof of the exhaust ports on a C43 head have been "massaged"?

ok so MarcusF can I do a came swap? and what is the significance of massaged exhaust ports? does that affect torque or horsepower?

 

[nrphlly]

thanks by the way

Hey Philly, this was looked at here.

You already have the larger throttle body (2001 and later CLK430s got the CLK55 sized TB), so you don't have to deal with the C43 ME 2.0 TB connection that won't fit.

Basically, you just want the cams. Maybe the injectors, but you may want to wait and see if you run lean first (doubtful). Did I mention the roof of the exhaust ports on a C43 head have been "massaged"?

I appreciate the help from everyone.

 

[Hary Gahtoe]

so basically you want me to rework my current block. If I go that route, is a 55 engine swap not easier to do and less costly as well. Id have to trust someone to play around in that block and do this work for me.

The 430 you have can be even faster than a old 55.
You'll pay less for just a donor motor and probably >100k mi. but it's oil pump,water pump, valve seals etc are heading' south. Hammerin' on motor with 100 k mi. can only lead to failures.
Your motor as a hybrid can make 50 hp more than a tired 55. It will be even better than a 55, best of all; new!

About price. If you want low cost power, go nitrous. The only thing you'll need are injectors and a high output fuel pump with a 100hp nitrous setup

 

[liquidusculade]

the price you will pay for a 43amg engine to swap for an already 4.3L engine is kinda high. and what do you have to gain? the difference in hp is only about 25. if your going to swap, why not use a 55amg engine? i know this really doesnt answer your question.

 

[nrphlly]

to answer your question.

the price you will pay for a 43amg engine to swap for an already 4.3L engine is kinda high. and what do you have to gain? the difference in hp is only about 25. if your going to swap, why not use a 55amg engine? i know this really doesnt answer your question.

I have seen 43amg engines going for 1500-2k. Thats not alot to me at all. I also can sell my current engine as well. This will offset the cost even If I get 500 bucks for it.

I have to gain- an authentic AMG engine and more horses. Im really just tired of the whole 430 amg debate. I there should have been a 43amg clk anyway. I will be buying a clk 55 cabrio very soon and I would like to feel the decrease/ increase in power and torgue as I change in an out of models.

I also just bought a porsche 928 and it has a 4.3L as well, and well to say the least, that thing just flys.

Its merely a custom adjustment, as I never look to get rid of the coupe because I love it.

 

[MarcusF]

Something isn't right here. C43 motors have higher CR than 430 engines.
That means different pistons.
Heads, that's news about massaged ports.
The 3 valve motor don't make power like; even a new Mustang GT. If your minds set on your CLK do a hybrid. Keep your block, have it rebored. Put in
aftermarket 55 pistons, massage the heads, get your 430 cams reground, put 55 aftermarket pistons in that thing. I'd put that setup against a 55

Sorry for the delay in responding, I don’t visit this forum that often.

You’re right, something isn’t right, but no one has been able to assuredly solve mystery. I have (what I think is) a pretty good guess, but it’s just a guess, and it’s been shot down before. According to AMG, the compression ratio on a C43 is 11:1. According to MB USA, the compression ratio on a standard 430 is 10:1. Looking at the part numbers for C43, the pistons, rods, heads and crank are the exact same as a standard 430. How they manage to use those parts and increase compression by a full point is the mystery. The July 1998 STAR magazine has a C43 article by Frank Barrett. Per the article, the engine received what he called "breathing improvements". The article states the intake manifold (which uses the same part number as a standard 430) has what he called "bigger ports". I would guess he meant the C43 TB, which was larger than a standard ME 2.0 TB, but he wrote ports - plural. It also says the air cleaner is a low restriction box, the cams have more duration, the valve springs are stiffer, it has a unique oil pump and it has a low restriction exhaust (although since it’s the only W202 V8 exhaust available, I don’t know what it’s lower than).

My "guess" is the heads were milled. Although a full point means a lot of material came off the heads. A whole lot. However, when heads are milled and a lot of material is removed on domestics, the intake side of the head is machined so an intake manifold with stock dimensions will fit. The point being that it's obvious. With that much material removed, the new cams "may" be required to have less lift, although I’ve never seen C43 cam specs.

Now the argument against this guess work - I’ve been told by a trusted source that the roof on the exhaust ports has been cleaned up. Just the roof. This same person told me the floor and sides were exactly the same as a standard 430, and if opened up, low RPM velocity would fall through the floor, making the engine a lot more peaky than I would like. He also said the heads haven’t been milled, the intake side of the heads haven't been touched and if the CR is a point higher, then AMG used different pistons. After showing him the part numbers and checking for himself, he said either the MB USA parts database is wrong, or the motor doesn’t have an 11:1 compression ratio – hence my saying no one has been able to assuredly solve mystery. Before writing off the MB parts database error, try looking for a 1131410124. It doesn’t exist. That was an OE TB for a 55. Look for a C43 piston, you'll see 1120300617.

Lastly, this dyno sheet is from a bone stock, 9,000 mile 2002 CLK430. Based on the dyno numbers, 302HP really isn't that far off.

Philly, have you considered swapping in a 5 liter M113? They have a lot more torque than a 430, though not as much as a 55.