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  #1  
Old 02-07-2011, 01:29 AM
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616 Injector pump/performance question.

I've searched quite a bit and haven't found exactly what I'm looking for. Apologies if the answer is obvious.
My 1983 240D runs pretty good for what it is and some of you may have seen my final drive change thread. I am attempting to extract every bit of power that's available without going to extremes.
I have the impression that if an IP is pumping all it's capable of then the car will smoke black at WOT. My car emits barely perceptible smoke even when I flog it so I'm thinking (hoping) there's more power available with a pump massage or adjustment. Is my rationale sound? I haven't checked the timing. I have installed new Monark nozzles from Sean Watts (very positive thing). The car will top out at 84 mph on a good day with no wind. Nowhere near the redline with the new FD ratio but possibly this is top speed no matter what the ratio.
Also, I have searched for rack adjustment information and can't quite get my head around how this is done or if it's even necessary in my case. Would adjusting the IP for more fuel delivery help the performance or just make smoke?
Open to any and all suggestions and thanks to all in advance!

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  #2  
Old 02-07-2011, 03:05 AM
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Answer

Here is what you need to study in depth.

Diesel Injection:
http://www.peachparts.com/shopforum/showthread.php?t=142405






.
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  #3  
Old 02-07-2011, 11:05 AM
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Adjusting it till you get Black smoke would mostly just be a waste of incompletely burned Fuel.

Have you read that thread concerning the Fuel Injection Pump Pressure Relief/Overflow Valve and is the Fuel Supply/Lift Pump pressure OK.
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  #4  
Old 02-07-2011, 11:20 AM
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This is a 616 four cylinder. Make sure the fuel supply pressure is at 19 pounds in the injection pump base. Many are far below that.

Since unlike the 617s us 240d d owners spend so much time with the pedal on the floor. Do you really want a cloud of black smoke? Or if you manage it the enforcement guys might stop you.

Do a thorough check and tune up as well. These engines need to give everything they can produce. Valve clearances, timing chain stretch and general timing, free flowing fuel suppy etc. I assume from the numbers posted yours is an automatic?

The cheapest way to get a real power boost is possibly installing the turbo five cylinder and it's transmission. Other than that gains will be limited.
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Old 02-07-2011, 11:28 AM
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gains will be limited huh? Ill just go ahead and dis-agree now. There is quite a bit more power to be had from these little engines and if you are mechanically inclined it is not to hard. I would not suggest to tc adjustment without a turbo installed though, although i would say removing your rack limiter will be the easiest and probably and as far as you would want to go. Make sure your maintanance is up to snuff first though you dont want to be covering up a issue by messing with your pump it is best to get everything in spec before messing with anything.

The rack is easy to adjust but just as easy to remove. there are allot of write up's on it just have to look at the 617 write-ups. Only thing is on the 616 you dont have to remove the pump or the oil filter just get a flat head bit with a small ratchet and a socket it fits in and you will be golden.
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  #6  
Old 02-07-2011, 11:44 AM
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Quote:
Originally Posted by josha37 View Post
There is quite a bit more power to be had from these little engines
Not without major modifications. Power is limited by air.
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  #7  
Old 02-07-2011, 11:53 AM
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good thing i got that base covered. Seriously though more power can be can be had without boosting it. it will never be a race car but.. it can be better
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  #8  
Old 02-07-2011, 12:29 PM
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What can I do to my 240D to get 148hp like the 300D?
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  #9  
Old 02-07-2011, 12:33 PM
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witchcraft
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  #10  
Old 02-07-2011, 12:40 PM
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I will respectfully disagree with my fellow member regarding TC adjustment. A proper TC adjustment, (not...what is it…5 turns now?... LOL, all in good fun), will give you the most bang for the buck, but the first thing to do is get an EGT gauge. It is possible to reach critical exhaust temperatures with out smoke.

The adjustments will be relatively slight if minimal smoke is a requirement, but there is additional power available that will improve drivability.

If you do not want smoke, what ever you do, do not remove the rack limiter. The rack limiter will play a very important roll, and will be adjusted slightly.

The big question is, do you have an EGR on the car? If so, there are some things that you will have to do first.
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  #11  
Old 02-07-2011, 12:44 PM
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yea im at 5 ish.. will be going more sooner . the tc is just kind of a pain in the ass thats why i was suggesting rack, smoking can still be controlled by your right foot . Why do you like that rack so much? I say just remove it and be done with it but you always insist on having it...
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  #12  
Old 02-07-2011, 12:49 PM
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Wow, I didn't know there were turbo 240Ds, is it a euro gray market?
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  #13  
Old 02-07-2011, 12:49 PM
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Wow, great replies and advice. This forum rules!
I don't want it to smoke for the sake of smoke, I just want to know that I am able to fuel at the max for the available air. Right now with no smoke I don't know if I'm 1% excess air or 30%.
Josha37 I'll look into the rack limiter delete function (thanks whunter for all the great links. I searched quite a bit and there are some in there that I saw and others I didn't) and might try it when I get some time.
For those that are probably wondering and in the interest of full disclosure the valve adjustment is recent and accurate, the air and fuel filters are clean, the injectors are Monarks by Sean Watts (in the last year) and I stretched the IP relief spring to 27mm. I have not touched the IP timing or checked cam chain stretch.
I am getting 26-27 mpg in quite cold weather (highway 65-75 mph), 0-60 is 24s (if I hold it in 3rd to 60) and the absolute top speed is 84 mph (level ground-3.07:1 final drive ratio).
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  #14  
Old 02-07-2011, 12:50 PM
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No it was a creation of my own.
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1981 300sd with a turbo 617
Monte carlo figure 8 car
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  #15  
Old 02-07-2011, 12:53 PM
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I gather that I can adjust the rack limiter for potential gains but don't need to remove it altogether?
I don't think I want to tackle the torque capsule at this point. I might have some more edjamacatin to do.

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