More power from my 240D (not a question!) - PeachParts Mercedes-Benz Forum

MercedesRover · #1 03-12-2006, 06:22 PM

No, I’m not asking…I’m hopefully contributing!

We all know how go make more black smoke with our cars, (or trucks in my case) right? Adjust the throttle stop in, turn the altitude sensor up a few turns. What I’ve never seen anyone address is how to get more air in there.

I was thinking about the air cleaner the other day and how I’ve got to add a second port in mine for the snorkel and got to thinking. There’s a tiny little hole in the center where it slips in to the intake manifold…I wonder if I can make that bigger?

I started looking at it this morning and notice that if I can take the center pipe out that slips into the manifold the hole in the manifold will be the smallest point and I can increase the amount of air allowed in by more than 100%. (though you may want to check my math...I'm no engineer!) With more air the throttle limit and altitude pot can be turned even richer meaning more power.........right?

Here's a picture of the small cone that slips into the manifold:

Not very clear but it measures 1.5" or about 1.75 square inches of area.

Here's the air cleaner with the cone cut out. It measures 2.25" or about 4.00 square inches of area.

I'll seal it with a piece of hose split down the length or a big o-ring if I can find one.

What do you all think? It'll be a week or two before I get the extra snorkle pipe welded in but when I do I'll let you know if it works.

jim

Diesel Giant · #2 03-12-2006, 06:26 PM

Very interesting but I dont think it will improve any power. The diesel engine is unthrottled which means it takes in all the air it wants. If you had a restriction, then it would act like the throttle plate on a carb. You really need something to push more air in the engine (turbo, uspercharger).

But let us know the results.

MercedesRover · #3 03-12-2006, 06:31 PM

But we can get more fuel in there than we need (by turning the throttle stop in and the pot out, making all kinds of black smoke at full throttle, obviously too rich) adding more air should make for better, more powerful burn. I'm thinking this little hole in the air cleaner is acting like just that...a restriction under high-demand. And like you said, the air is unthrottled so this shouldn't effect how the engine runs except under a high-demand condition.

Diesel Giant · #4 03-12-2006, 06:33 PM

If you can get more fuel and more air in there then yes you will have more power. If you get more black smoke, you have either too much fuel or not enough air.

MercedesRover · #5 03-12-2006, 06:46 PM

That's just my point...My adjustments aren't at their limits for making too much smoke. With the air intake larger it'll take more air under high-demand and I can increase my adjustments accordingly making more power.

Or maybe not!

I'll let you know.

jim

#6 03-12-2006, 06:52 PM

BTW keep in mind that you just removed a device which looked an aweful lot like a velocity stack...

...which is going to be about the best way to let air naturally flow in there.

Removing that device might have actually made it worse...just a thought.

The larger hole is good...but its my guess that they would have optimized the opening for the engine to breathe the best...

Gurkha · #7 03-12-2006, 09:19 PM

The OM616 can give you extremely reliable and frugal 72bhp at 4800rpm,this is not an aftermarket mod but a factory mod for OM616 used in the G Wagen 240GD and Tempo Traveler vans.All it needs is pump tweak for plungers and a new pump governor,mate it to euro 5 speed from the 300D turbo and you have a very peppy 240D.

ConnClark · #8 03-12-2006, 09:41 PM

As far as allowing it to breath better you would probably be better off installing a second air filter housing in parallel. One and a half inches should flow plenty for cool air. Every little bit helps, but I don't think your going to see much of a difference.

#9 03-12-2006, 09:45 PM

Quote:

Originally Posted by ConnClark

As far as allowing it to breath better you would probably be better off installing a second air filter housing in parallel. One and a half inches should flow plenty for cool air. Every little bit helps, but I don't think your going to see much of a difference.

I believe you will agree with me Conn that its time for the leafblower

hahaha

Where is that full load 240D adjustment

ConnClark · #10 03-12-2006, 09:49 PM

Quote:

Originally Posted by Brandon314159

I believe you will agree with me Conn that its time for the leafblower

hahaha

Absolutly.

barry123400 · #11 03-12-2006, 11:23 PM

As the piston decends on the intake stroke it of course sucks in the required air to eliminate any atmoshere difference created as the piston decends. My guess is that present opening serves that function plus a little more by design already. You have to find a way to force more air in before a meaningful difference will occur. Laws of physics I am afraid. Ram air is about the cheapest I can think of but you cannot steal it from directly behind the fan for a couple of reasons. One you are going to a snorkel system and two that air would be preheated. Hotter air of course is less dense but VWs may do better on it. This may not be the actual cause but something quirky happens to them (earlier vw diesels)in really really hot weather with the old blocks. Milage jumps about 15% or more. Another design of ram air may help plus having a way to convert to snorkel when required. Other than this think you are looking at a blower. If you can incorporate a larger inlet on your snorkel system It will not hurt I believe but may not make a noticable difference either. Depends I guess. You of course want to use a rubber pipe coupling between the manifold and your snorkel to eliminate damage from vibration to the manifold. The other side of the coin is if you believe it is making more power you might think it is and even if not it may make you feel good....How about a tuned input pipe? The snorkel. Works more or less like a tuned exhaust pipe? In reverse of course. Have to give this up it's becoming too abstract.