1990 300ce engiune swap with a JDM engine or small block chevy - Mercedes-Benz Forum

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post #1 of 24 (permalink) Old 05-14-2006, 03:20 PM Thread Starter
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Date registered: May 2006
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Talking 1990 300ce engiune swap with a JDM engine or small block chevy

Hey,
I wanted to know what would be the best way to go?
I was thinking of swapping out the engine in my1990 mercedes 300ce with either a JDM engine, a crate motor( Small block 305\350) or a caddy northstar
Does anyone know anthing about engine swapping?
thanks.

Last edited by 32FLOZ; 05-14-2006 at 07:58 PM.
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post #2 of 24 (permalink) Old 05-14-2006, 10:52 PM
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Have not done it with a Mercedes, but a couple thoughts: the crate 350 will be a good deal heavier than the 3.0 litre 6. Don't know about the JDM.

The heavier engine might be hard on the suspension and it will definitely affect handling.

It can be done, but the resale of the car will drop to nearly nothing.

For reasons that are probably more emotional than anything else -- mixed transplants sit in a funny place in the used auto world.

Did a conversion on a Jaguar 3.8 many years ago to a 350 when the 3.8 was an awful engine in the first place (unlike the MBZ 3.0).

We couldn't give the car away a year later.

Mike

Now: 2010 GLK350 4Matic Then: 2003 C320 4Matic, 2006 E320 CDI, 2000 E320, 1994 E320, 1991 190E, 1985 300D, 1983 300D


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post #3 of 24 (permalink) Old 05-15-2006, 08:38 AM
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Come on, if you want the "status" of a Mercedes you ought to pay Mercedes prices.

Putting a stone age motor in one is just wrong.

Kent Christensen
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post #4 of 24 (permalink) Old 05-15-2006, 10:08 AM Thread Starter
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Smile

thanks

it's not so much a status thing as it is a love of the style.
if we don't try new things we won't progress and a Mopar Mercedes would be awsome.
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post #5 of 24 (permalink) Old 05-15-2006, 11:19 AM
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Buy a Chrysler 300C. Then you can get a Mopar with a 10 year old Mercedes suspension and other outdated parts. If you're interested in Japanese, buy a Lexus LS. They ripped off Mercedes' styling for that thing anyway.

I'm with mjhawkins, too. The resale value of an unnaturally powered Mercedes would be approximately zero.
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post #6 of 24 (permalink) Old 05-15-2006, 11:27 AM
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Actually a crate LS1 Class motor will weigh less than the M103 motor and combined with the correct ZF 6 speed transmission do the following: Bump HP to the 350-400 HP range, increase Highway MPG to 27-31. In town driving will be in the 20-22 mpg range.

Those numbers are based off of 98-2005 Corvette standard configuration numbers for HP and MPG (I have personal experience with the 98 version). The motor is very light as it is aluminum and the added benefit that with the V8 setting a bit back, it will balance the car better.

I would suggest getting the MB sportline suspension pieces, H&R springs and Bilstein Springs. You should budget about $6000 for the project including suspension. If you go with the monster LS6, please add another $4000. and another 150HP. At that point I would try and get a 500E rear end.

You should be able to find a good used motor/tranny from a broken corvette to work with for under $3K that will lessen the cost of the project. There will not be a tremendous amount of welding to do for mounting. There is a company (can't remember its name) that sells a box that will deal with all your speedometer conversion needs when the time comes.

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Last edited by mcbear; 05-15-2006 at 01:27 PM.
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post #7 of 24 (permalink) Old 05-15-2006, 11:39 AM
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Quote:
Originally Posted by lkchris
Come on, if you want the "status" of a Mercedes you ought to pay Mercedes prices.

Putting a stone age motor in one is just wrong.
The GM small blocks are about as far from stone aged as possible. In 2006 numbers, GM is getting 505 HP out of the Corvette Z06 (5.7L) motor NA. MB requires Forced Induction to get the same HP figures from similar cubic inches.

In 93, MB (with assistance from Porsche) was touting the 500E as the Monster motor with 320HP. I have one and it screams BUT, at the same time the ZR1 was putting down 375+HP from their stone aged motor. I had one and it REALLY screamed.

I like to think of it as putting one of the best developed motors in the world in one of the best designed cars in the world.

If you discount hybrids, you lose Cobra, Pantera, Cunningham, Scarab, Listers and so many more very pure sports cars that have made an impression on the hobby. Sometimes stock is just stock.

McBear,
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post #8 of 24 (permalink) Old 05-15-2006, 01:19 PM
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I just replaced the blown engine in my 1990 300E with the R103 (983). It's the only way to go, really. The car was designed for it and it's a perfect marriage; the 103 is a great engine and you can't beat it.
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post #9 of 24 (permalink) Old 05-15-2006, 01:29 PM
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Quote:
Originally Posted by thetentguy
I just replaced the blown engine in my 1990 300E with the R103 (983). It's the only way to go, really. The car was designed for it and it's a perfect marriage; the 103 is a great engine and you can't beat it.
What improvements did you get from an R103 and what was the costs to flip? same computer? etc?

Brain is foggy, what car is an R103 from? M103 is from 126 and 124 lines, can't place the R103 but that only means that old age is hiding things from me.

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Last edited by mcbear; 05-15-2006 at 01:34 PM.
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post #10 of 24 (permalink) Old 05-15-2006, 09:02 PM
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Stay away from the Northstar. The small block V-8 will be an easier conversion. I wouldn't fool with the JDM. Trying to adapt a front drive setup to rear drive will be a bitch-just like the Northstar. Are you going to run fuel injection or a carburetor? What transmission do you plan to use-TH350, 400 or 700r4. Is there an adaptable speed sensor for the computer or will you use the old style vaccum modulated transmission?
Sounds like fun-I'd do it! It's not like the car is a gull wing or something of the like! The purist act like there are people waiting in line at Barrett-Jackson to give you 100k for an original 1990 300ce!
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