azncarjunkie

Hey everyone,

I've been annoyed with how little power the 63 motors have been able to produce given their enormous potential. I wanted to take it up a notch that bolt-ons just wouldn't be able to provide (or a few).

Someone recommended that I should post over here since there's probably a bunch of people that might want to partake in the viewing of blowing out a 63 motor. Plus, you get to finally get to see some of the main components in your beastly engines.

Take a peek. I'll be updating that thread periodically as progress continues.

https://mbworld.org/forums/slk-class...p-n-slk63.html

blackbenzz

Good luck

DAGREEKNYC

with alot of $$$$$ anything is possible , good luck

stevebez

700-800 hp out of a n/a 63 motor?

You gonna need more than alot of luck. Frankly I think it's not possible. The valve train cannot handle the rpm you need to reach for that power output. But I admire your project ... I'll be tuning in for sure and hope u prove me wrong....

citylightva

I think he said he's changing out the valve train...800 is not ridiculous for a 6.2 liter...3.8 liters more than an F1 engine making 100hp less than F1 (at least)...

Jakpro1

Besides Indy Car/F1 motors, I have been struggling to find some smaller displacement motors that put out that kinda juice.

Yeah I know 6.2 is a lot for us Benz guys, but most 800hp N/A motors are monster blocks 500-572s.

Just found a 358Cube Roush Motor that puts out around 800hp.

She sure is gonna be one of a kind that is for sure!

Best of luck

citylightva

Oh yeah, no doubt it's not easy at all...There are a couple NA motors making around 125hp/liter (Ferrari in the Scud)...I have no idea if this block can't even withstand revving that high, it just didn't seem impossible if you're stripping the entire engine and rebuilding all the internals...

MB_Forever

I don't know... you would have to rev very high to get that kind of power

Havoc

I agree, but in addition to revving high, the compression will need to be increased to 12:1 or 12.5:1, aggressive camshafts will be required and a massive intake will have to be fabricated. Although 800 HP is not ridiculous for a 6.2L V8, it is for an AMG engine. While Chevy and Ford have aftermarket Heads with racing geometry that's proven at the track, we do not. We're limited to our stock heads and remember, the Heads is where the power is at. Port and Polish with slightly bigger valves is minimal. Changing combustion shape and runner size is where huge power is made!

JamE55

As blackbenzz would say......MOTEC!!

Ali_E55

very hard, without F/I.

i hope you can do it, and good luck.

JonMBZ

Hopefully Vadim isn't in charge of this project.

citylightva

jrcart

Is the OP claiming 700-800 crank or at the wheels, that needs to be determined first. 700-800 at the crank is easliy attainable with a stroker motor, block has room for a larger bore and inreasing the stroke can increase displacment to 7.1 liters. I know this can be done because I'm looking into it right now and have talked with a few credible sources on this topic. FWIW my car is now making around 650 NA HP at the crank with stock crank, rods and pistons. I think the OPs claim of 700-800 is much more realistic than some of the guys in the past claiming they are gonna make 1000+ and have yet to post up any numbers that are even close. Now if OP is claiming 700-800 at wheels I will be the first to call BS, ain't gonna happen without turbo, blower or nitrous.


....one more question, Mercredes makes a SLK 63???? I was not aware of that, that little car must be a rocket with even a stock 63 motor in it.

QuadBenz

MB doesn't. The OP is going to be shoehorning a 63 motor into an SLK.

azncarjunkie

To answer a few questions, there is indeed some serious mods to all the major components to reach the type of HP that I'm looking for. The reason for the titanium internals is to lighten and strengthen everything up to handle the higher rpms along with the raised compression. Depending on testing we'll see how far it will go. There will be a good amount of testing, grinding, welding, grinding, polishing, testing, involved

The intake system is getting completely swapped out a custom billet individual throttle body setup.

Obviously a build like this has a large amount of experimenting. I will be experimenting with many different individual components (like different valves to test flow values).

Fuel management is certainly standalone. After investigating the stock system, it just won't fly.

Before there's too much naysaying, look up the specs on a nascar motor. Now add 2 valves per cylinder and 2 more cams. Should be easy enough to get close to or exceed it!

Stay tuned. Waiting for parts to start playing and flowing the head.

Havoc

Are you planning on keeping the bore and stroke stock?

Dude that custom billet individual throttle body intake setup feeding each cylinder sounds amazing and will make tons of power at high RPMs. I can't wait to see that and hope you can make it work.
I'm trying to get just 2 stock 74mm throttle bodies onto my 55K with no luck as of yet, but I'm having someone else look into it so hopefully these guys can make it work..

jrcart

If you are successful in attaining 700 to 800 rwhp, and I hope you are, what are your plans for the tranny and rear end?

blackbenzz

TH400 and Ford 9" rear, git r done lol

acb

MB_Forever

Seems like it would be easier to just supercharge the existing 55 engine with the Mercedes supercharger and then mod it. Some of the 55k are pushing 700 to 750 at the crank already

citylightva

But as you said, It's been done...I'm still a fan of replacing the pano roof with a custom braced CF one Goodbye 200lbs. of top heavy fat.!!!! I'm back off to Wishville

azncarjunkie

Tranny-back isn't completely finalized. Possibly manual just for fun. Possibly Sequential. Definitely not stock. Depends on how much power the motor actually ends up putting out when done.

As for going nuts on a 55 motor, it's just not as nice of a motor to go nuts on. It's open deck, SOHC, 3 valve, and a lower displacement than the 63 closed deck dohc, 4 valve. A FI 63 would be gobs of power but that isn't this particular project. I still wanted something streetable without worrying about accidentally breaking the tires loose in 4th on the highway....we'll see. Smooth power for road-course racetrack was of more interest.

Anyway, a couple more pictures to have fun with.

Pic #1: Head on the left is a 63 head. Head on the right is from a new Nissan GTR.
Pic #2: The interior diameter is the diameter of the 63's piston against the background head of the popular honda k20 motor.

Yacht Master

[QUOTE=azncarjunkie;4090094] I still wanted something streetable without worrying about accidentally breaking the tires loose in 4th on the highway....we'll see. Smooth power for road-course racetrack was of more interest.
QUOTE]

What you will find in a N/A motor of 800 HP is that, "streetable" will not be a strong characteristic. I would be surprised to see an idle less than 1400 rpm and you may not see much torque until 4000+ rpm.
Good luck, sounds like you don't know much about engines, or accidentally breaking tires loose in what ever 4th gear you come up with. A well thought out project has all the answers before the work commences. Yours sounds like a dream it up as you go.

LZH

Good luck on this project..putting it in a SLK seems like a bad idea though...that much power is gonna twist that little frame into a pretzel. You mentioned road racing....if that's what you plan on doing, the CLK Black Series would be the best platform. I wish you the best of luck and I hope you have $100k burning a hole in your pocket casue thats what it's gonna cost to do it right.