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  #1  
Old 02-24-2003, 08:44 AM
kellyo
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m103 vs m104

Can someone offer up a few ideas on going with the double overhead cam m104 engine (228hp) in an e300 sportline that has an m103 engine (177hp) installed? What are the basic changes needed to make this work? Specifically, will the transmission need to be changed/ upgraded, and will the motor mounts stay the same? An overview of all major areas appreciated.....

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  #2  
Old 02-24-2003, 10:46 AM
Potomac German Auto
 
Join Date: Mar 2002
Location: Frederick, MD
Posts: 407
ECU swap, Ignition Module (EZL) swap, motor mounts should be the same.

Trans swap is a must, go for a 5 spd manual, if you can find one

Also, change the rear diff out !
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1994 E500 (MY SUNDAY DRIVER)
1993 190E SPORTLINE LE W/ M104 SWAP
1997 C230
2002 ML320
2000 BMW 528I (WIFEY'S CAR)

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  #3  
Old 02-24-2003, 10:51 AM
kellyo
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Is the trans swap a must because it would be "stupid" to go for the deal without going for the performance increase of a manual transmission? Or is it truly going to be too much power for the automatic?

Same question for the rear end>

Thanks
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  #4  
Old 02-24-2003, 12:03 PM
Potomac German Auto
 
Join Date: Mar 2002
Location: Frederick, MD
Posts: 407
I would have to say that it is better for performance reasons.

The auto "slushbox" would inhibit the performance you are seeking.

IMHO!
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1994 E500 (MY SUNDAY DRIVER)
1993 190E SPORTLINE LE W/ M104 SWAP
1997 C230
2002 ML320
2000 BMW 528I (WIFEY'S CAR)

"Excuses are crutches for the unfounded."
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  #5  
Old 02-24-2003, 04:43 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
I think later M104s use Bosch HFM instead of Bosch KE-Jetronic. There's a lot of electronics to transfer over if you're switching to HFM.

Sixto
91 300SE
87 300SDL
83 300SD
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  #6  
Old 02-24-2003, 05:49 PM
Super Moderator
 
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,318
Larry Bible and I discuss this periodically.

Unless you can get an entire donor car, I think you would be better off starting with a M104 car and making it a Sportline.

My scheme is a little different - I want to use my the 5-speed, clutch, pedals, etc. from my ageing 300E in a M104 car.
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'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #7  
Old 02-25-2003, 12:06 AM
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Join Date: Dec 2001
Location: Southern California, U.S.A.
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Quote:
Originally posted by sixto
I think later M104s use Bosch HFM instead of Bosch KE-Jetronic. There's a lot of electronics to transfer over if you're switching to HFM.
The '90-'92 M104 engines were 3.0 liters, had 24 valves, and used the same KE-Jetronic.

The '93 and later M104 engines were 3.2 liters, used the all electronic HFM, and have variable valve timing.
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2001 E430, Bourdeaux Red, Oyster interior.
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  #8  
Old 02-25-2003, 02:06 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
Do a search on member name ke6dcj (Neil). He dropped a C36 M104 into his 88 300TE. It's not something you do in your garage in your spare time if you want to get it running and tuned in this lifetime... unless you're Steve Brotherton or someone like that.

Sixto
91 300SE
87 300SDL
83 300SD

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