Is it possible, or has anyone attempted to drop the V12 motor in a R129 chassis?
Jeff
For me making the go no-go decision required purchasing the car with the engine for proper evaluation. I would say right off the bat that chances are very good because the 129 came with an M120 V-12. The main area of concern is what might be in the way of the turbos.
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Quote:
Originally Posted by roncallo
For me making the go no-go decision required purchasing the car with the engine for proper evaluation. I would say right off the bat that chances are very good because the 129 came with an M120 V-12. The main area of concern is what might be in the way of the turbos.
roncallo the M137 is the V12 n/a 5.8L one with 367 PS or the V12 n/a 6.3 L with 444 PS (AMG).
The bi-turbo V12 is the M275.
cygnusceo, sorry for asking but since the R129 already came with a V12 (the M120) why do you want to use a V12 from another car? Just wondering.
Cheers.
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The M137 is a turd compared to the M120 that the 129's already came with OEM.
The M137's got 30 less horsepower and has a pretty bad rep reliability-wise. I'm not sure why you would want to change motors? The M120's are a bulletproof design. The only ones I have ever heard of having real problems or needing rebuilding were the early M120.980 motors in the W140's. The original engine management had a fault that under certain conditions would dump excessive fuel, washing the cylinder walls and causing scoring. But the later models in the R129 didn't have this issue, and are pretty trouble-free. Much better than the 137's. The ADS system, however, is another story.
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Vehicle: 2000 Obsidian Black Metallic Mercedes SL 320 V6
Location: Northern Italy near Milan
Posts: 3,211
Roncallo is right: if you decide to go for the M120 you would be better off selling yours and go for an SL600.
As for the M137 I honestly can't see a reason why you should go r that engine and to be very honest with you I can't really see a reason why Mercedes produced that engine first thing. Actually compared with the other V12 they produced that engine seems lame. If you really want an engine from that e you might want to consider the V12 bi-turbo M275 one that has 500 BHPs and from my point of view makes more sense.
The only ones I have ever heard of having real problems or needing rebuilding were the early M120.980 motors in the W140's. The original engine management had a fault that under certain conditions would dump excessive fuel, washing the cylinder walls and causing scoring.
If this is true, then it is a useful tidbit of information worthy of being repeated in the future. But as an ex-Bosch engineer I am skeptical, and with so much misinformation on the web I wonder if the source for this engine management fault is credible...
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