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  #1  
Old 02-26-2003, 08:14 AM
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Join Date: Aug 2002
Location: Sydney Australia
Posts: 105
Putting an M104 3.2L in where a M103 3.0L came from advice please

Okay boys and girls time to teach me something.

I have on order this fantastic little engine called an M104 3.2L 24v, and i plan on putting it in my 300ce 1988, which previously had an M103 3.0L 12v.

Now what conversions do i need to make, obviously i need to put in a computer to deal with the Electronic Fuel Injection, or the HFM what ever it has. But do i also need to put in fuel pumps or higher pressure lines, i plan on putting in the gearbox from the later model to deal with the power increase and the torque increase but will i need to change the driveshaft, and the diff center?

If so can you please tell me what differential my car currently has and what i need to put in it so that it can deal with the power increase, and the different ratios. Or should i keep the current diff center to have a better take off and 0-60 time.

Top end speed with me isn't a big thing, like i would love to be able to pull 100mph maybe 125mph but thats not necessary as you all may know.

The engine block is the same as i have discovered so therefore i shouldn't need to change mounts or anything, the gearbox selector looks different nbut thats all just cosmetics i can fix that later. what i really need is a plan on how to do this conversion as quick as possible.

I have three mechanics and an auto electrician, and IMHO i'm pretty good at being a DIYer so i hopefully won't have any lack of man power, but i do need brain power i can think of the main things i may need but there are always somethings you forget and its best to know about them before you have one engine out the other half way in and all of a sudden its like

"ah, dude, i think its like the wrong way around, maybe, i dunno" (worst case senario, i don't think even i'm that dumb)

anyway your input would be greatly valued thanks in advanced.

mike
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'Some Fear' because 'No Fear' means your not going fast enough.

300CE yr1988,
SL55Kompressor yr2002,
CLK320 yr2002.
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  #2  
Old 02-26-2003, 11:53 AM
Potomac German Auto
 
Join Date: Mar 2002
Location: Frederick, MD
Posts: 407
Which M104 engine do you have ?
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1994 E500 (MY SUNDAY DRIVER)
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2002 ML320
2000 BMW 528I (WIFEY'S CAR)

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  #3  
Old 02-26-2003, 07:05 PM
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Join Date: Jan 2002
Location: England
Posts: 1,841
Have you thought about radiators and cooling? Also, do you have cruise control? I'm pretty sure cruise will require some modification.
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  #4  
Old 02-26-2003, 08:40 PM
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Join Date: Feb 2002
Location: Orlando, FL
Posts: 788
Sorry that I don't have any technical advice that will help you, but I was just thinking what a sweet conversion this would be for a W126 300SE. That would really be one of a kind. You would then have a 300SE with more HP than a 420SEL!

Mike, do you plan on taking pictures and perhaps making a step-by-step webpage? I commend you for taking this on! Good luck and keep us posted.
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904 Midnight Blue, Gray Velour
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  #5  
Old 02-26-2003, 08:51 PM
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Join Date: Jan 2003
Location: Sydney, Australia
Posts: 627
Mike,

You are talking about a seriously involved job. Whilst the M104 is derived from the M103 there are some big differences, especially as it appears that you are talking about a 3.2 with HFM rather than the 3.0-24 which has KE-Jetronic like the M103. The M104 3.0-24 might be a better option. Easier still, sell the 300CE and buy an E320 coupe, 320CE or even a 300CE-24.

I also notice you are in Sydney. Are you a club member. If not, you should consider it. See:
http://www.mercedes-benzclubnsw.com.au/

Greg
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  #6  
Old 02-26-2003, 09:01 PM
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Join Date: Feb 2002
Location: Orlando, FL
Posts: 788
I'm no professional, but I say if Mr. Tummala (mbcoupes.com) can stuff a 5.0L M119 in a W126 SEC, anything's possible!
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904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.

"A Mercedes-Benz is like a fine wine, it only gets better with age."
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  #7  
Old 02-27-2003, 06:40 AM
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Join Date: Aug 2002
Location: Sydney Australia
Posts: 105
sure its involved but no more than some other jobs are.

-i mean there is no cutting or grinding to be done,
-there is no need to adjust the engine mounts,
-the gearbox will fit straight in,
-the wiring harness dimensions will all be similar,
-i already have a brand new radiator,
-the weight difference won't require a major brake upgrade(ABS accounts for fade),

so what could possibly be so hard.

-yes the cruise control will be something i have to consider,
-the cooling should be fine, i plan on putting another electric fan on the back of the radiator instead of the viscous fan.

greg the power difference between the two engines 3.0-24v and 3.2-24v is big like almost 1000rpm earlier peak BHP and a lot more Nm so the HFM is the go over the HFM besides they will cost me around the same, and there is always gonna be extra work to be done. even with essentially the same motor(3.0-24v)

so i might aswell go all the way.

besides in AUD i have only spent about $23000, and my car has a brand new paint job, the 17in rims, rebuilt box, full sound system. so why would i sell it for say 26000 and then invest another 25000 atleast into a car that i can make mine into for about 1/6th the price. besides i like the experience and there are bound to be guys out there who are interested in learning how to do it for there own cars.
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'Some Fear' because 'No Fear' means your not going fast enough.

300CE yr1988,
SL55Kompressor yr2002,
CLK320 yr2002.
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