superchargers - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 01-21-2010, 08:57 AM Thread Starter
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Post superchargers

ive heard that i could put a supercharger on my engine. not sure how they work or if its possible.

anyone have info on these?

car = the ghost 72 250


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post #2 of 8 (permalink) Old 01-21-2010, 09:15 AM
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Superchargers and turbos both force more air into the engine and more air means that more fuel can be burned. More burned fuel means more power.

A turbo is driven by the pressure in the exhaust fumes, a supercharger is driven by the engine itself, via a drivebelt of chain.

Simply adding a turbo or supercharger won't do any good, you will need to increase the fuel supply too. Not all engines can handle the increased pressure and temperature that the turbo of supercharger will produce.
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post #3 of 8 (permalink) Old 01-21-2010, 05:26 PM Thread Starter
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hmmm, wonder if there was a way to find out with out blowing it up? lol

what would i use to increase fuel supply?


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post #4 of 8 (permalink) Old 01-22-2010, 06:00 AM
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blowing up

I think that any engine that wasn't designed to have a turbo , supercharger from factory, will blow up, or shorten life span in time considerably. You need to consider compression ratios, carb needs to go before intake on turbo, more fuel on carb is not that simple because it will only need to ad fuel as the boost increases. oil cooling, where you get the Oil press from, oil lubrication on buttom of piston, your current pistons and rings condition. I think most benz pistons are hyperrutectic,(alloy blend) so they won't blow up that easy, but the rings will crack, connecting rods will crack. head gasket will blow hole letting water in engine if it's not in good shape. etc etc etc.

turbo240 tried a very long and detailed project of putting a turbo on a 240D and he blew the rings and lost compression. Even though it's a diesel and not gas like yours it should have held up right. but unfortunately no it didn't have the proper lubrication to handle the heat and pressures.
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post #5 of 8 (permalink) Old 01-22-2010, 03:28 PM
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I wouldn't supercharge or turbo-charge an old engine for the reasons Keevo stated. You are likely to drive a piston out the bottom of the oil pan, assuming the rings don't decide to act like fragmentation grenades before then.

Older engines lack the gasket integrity, the cooling jackets in the block casting, and the oil flow to all the twirly bits to sustain the motor under the stress of a pressurized intake charge. Even if the block is stout enough to stand the strain, there are a ton of other parts that aren't. In short, they simply aren't designed to take the load.

Good luck.

"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck
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post #6 of 8 (permalink) Old 01-23-2010, 12:26 AM
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All that stated, if one replaced the rings and installed something with one or two psi of boost, the engine might be able to take it ...
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post #7 of 8 (permalink) Old 01-24-2010, 12:53 AM
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Which 250?

You have a 250 S (W108) or a 250 (123)?

Getting mor power from the 250 S is not worthwile, it is a engine known to oil consumption and pistion-rings-block frictioning. If you want more power get a 280 from a 123 (dubble cam) in your car.

If it is a 250 from the 123, this engine was good for miles and more but MB reduced power to giustify the 280 (not injection). So a good deal could be, make it EFI. Take the inlet-manifold from a 250 W114-5 injection car (D-jet) and a megasquirt, 6 new injectors from Bosch with about 180-200 cc and 14-15 ohm, a Bosch TPS instead of the original D-jet sensor. Block the distributor edvance and get a laser cutted optical trigger plate with optical trigger in your distributor and you will gain power.
If in USA the compression ratio is low, get it near 10:1 and the engine will be good for 170 PS (not SEA HP).


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post #8 of 8 (permalink) Old 01-24-2010, 08:24 PM Thread Starter
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its a 72 250 (s)edan . w114.

and yeah it does consume some oil.


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