I agree....for gods sake don't back track! The I6 is a strong reliable motor, but its gonna be HUGE money to get it anywhere close to where you start out with the 560....assuming you don't want the motor to go "bang" after a few thousand miles anyway

__________________
1999 C43 AMG ~~~ 744 on black, mostly stock
1991 190e 2.6 ~~~ m117 5.6 project car

Don't sell the M103/M104 short as far as being able to make power.

The stock transmission he has will more then handle a Mosselman TT install.

I'm running a stock 722.358 with 63K miles behind a M103-12V Turbotechnics twin turbo.

Making about 350+ HP and Torque.

Performance is faster then any 4.3L, 5,4L NA AMG V8.
Runs low five seconds to sixty mile per hour.

You don't have to build a 1000HP "hand grenade" that will ultimately explode....

__________________
http://i19.photobucket.com/albums/b1...c/GOWIDE-1.jpg
1971 280SL ROADSTER
1988 300CE TWIN TURBO WIDEBODY
1994 E320 CABRIOLET
1999 C43 AMG
2005 G55K AMG
2008 CLK63 AMG BLACK SERIES

No the 103 is not short on HP but a stock M119 starts life at 315 HP and more than likely more torque over a wider range than your 350HP M103.

My biggest question is this choice is it's application into a 560SEC. The 560SEC is a luxury coupe. When you start to pull 350 HP from a 103 is has to be a whinny screaming engine. In my opinion this type of application into a 560SEC will reduce the value of the car. 450HP can be had out of an M119 without much effort or suffering of drive ability. Or 700 to 1000 HP can be done with a whinny screaming scenario. I believe an M119 installed into a 560SEC will increase the value of the car even with performance enhancements up to about 500 HP as long as the spirit of the car remains intact.

My personal #1 choice for the 560SEC is the M120 V12. See Steve in SoCal sticky on this. If you loose the throttle by wire and MB engine management this becomes an affordable option. But I would put a Chevy 7.0 liter vett engine in as a second choice.

John Roncallo

I was addressing the OP with a 300SEL....not sure how we got to 560SEC and M120 V12...trying to stay on topic !!!!

"Whinny screaming engine".....

You really aren't familiar with the M103-12V if you make such a comment !!!

Max torque @ 4250RPM, max HP @ 5500RPM....very flat curve, no turbo lag, no kick in, starts producing around 1500-1700RPM.

I'm probably close to 400 lb ft at the flywheel @ .48 bar boost on the Garrett T2's.

How does one get 450HP from a M119 without much effort ????

Sure more HP from a M119 V8 but what is your power to weight ratio?


Ed A.

P.S.

My 300CE is also a "luxury coupe"....or at least that is what I was told when I paid 53 large for it in May of 1988...
More expensive then the SL, and second to the SEC.....

My install of a Turbotechnics kit circa 1992 more then meets the "spirit" of the car...
Why?.... because it was an available option installed at delivery by a UK Merc dealer....

No different then dealer AMG mods at the time.

MY 300CE is very "period" and unlike others who
build monster engines that explode, my M103-12V performs like a stock engine from idle to 1500 rpm, including passing emissions controls.
No loud exhaust, just an AMG like V8 rumble on acceleration....!!

__________________
http://i19.photobucket.com/albums/b1...c/GOWIDE-1.jpg
1971 280SL ROADSTER
1988 300CE TWIN TURBO WIDEBODY
1994 E320 CABRIOLET
1999 C43 AMG
2005 G55K AMG
2008 CLK63 AMG BLACK SERIES

Well we got off topic because the OP was discussing a transmission mod only for a 300SEL. Another poster mentioned the 560SEC M103 conversion.

Whinny screaming is a matter of opinion, I could be wrong here it might impress me with Db to power ratio. Lets just call it more whinny and screaming than a larger V8.

Well if we are talking flywheel HP then all you have to do is start it up. If we are talking RWHP then about .6 bar should do it non intercooled single turbo.

Power to weight ratio must be considered as installed power to total car weight ratio. This is one of the reasons the SEC is more favorable to a larger engine. The excess engine weight gets lost in the total weight.

Not in a million years, I left MB in October of 1988, The 560SEC was the most expensive car offered at 77K, 560SEL was 75K, 560SL was 65K. The 300CE was not in the same class with any of these cars.

I'm very sure it does. It sound like a very nice system. The only thing I'm saying is that it would not meet the spirit of the 560SEC or the 560SEL.

John Roncallo

m103 vs m119 "there is no power to weight" differences in those engines.
They are both same weight. Because m119 is alloy and m103 is iron block...

??????

And a W126 weighs the same as a W124..............

__________________
http://i19.photobucket.com/albums/b1...c/GOWIDE-1.jpg
1971 280SL ROADSTER
1988 300CE TWIN TURBO WIDEBODY
1994 E320 CABRIOLET
1999 C43 AMG
2005 G55K AMG
2008 CLK63 AMG BLACK SERIES