I have a none turbo 603 motor which is rather slow. I have read some posts where people have replaced the elements to the larger 6-7mm size to increase flow. Is this procedure primarily beneficial for turbo motors or will I achieve additional power for my non turbo motor?

My goal. I really want the best long term durable diesel (like a 617A) not necessarily a tire burner. I will be doing all the work.

Additionally what are your thoughts on a 606n/a transplant instead. With its mechanical fi pump it seems to be fairly plug and play other than reconfiguring the exhaust?

Thanks
Mark

I posted this in the G section as well.

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There are lots of used turbo engines out there, I suggest that a swap might be cheaper and more robust an option than trying to get more power from the NA.

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Gone to the dark side

- Jeff

There is a member at STD with a turbo on his NA. Have you done all the proper maintenance? Adjusting the pump might give you some modest gains. I have driven the NA 603 and was totally unimpressed although many consider it to have "enough" power...

__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

The PO had the pump totally rebuilt by Bosch. However the install was done by a local mechanic in his area. So there could be some wiggle room as to how it was set up.

It idles nice though in my opinion a little low 500rpm (according to the manual should be around 700).

When driving 70mph on the interstate after 70 I don't have any more power even though the accelerator pedal can go further. Even the kickdown will not kick in at that speed. And any slight incline on the interstate the speed begins to drop down to about 63 before it begins to accelerate again. Now if I were going slightly down hill then I have extra power to push it to about 85.

The transmission has been adjusted properly and the vehicle only has 190k on it.

I have heard as you mentioned that it is just a slug and there is nothing to be done but surely there is a little more juice to be had.

I really like the ease of install of the 606 N/A but obviously the 606A would for me be the cream of the crop.

Thanks for the insight
Mark

If it's set up like the 300SDL with the turbo 603, there's a black rotary dial on the firewall somewhere under the hood with the numbers 1 through 7. This is an idle RPM adjuster. Play with different values, each numerical step up corresponds to 20 RPM. Factory setting on mine is '4', but I don't know about yours.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL

I don't believe the non-aspirated one had that. I have been all over that engine but I will look again to make sure. What would the RPM adjuster be adjusting? The mechanical linkage? Sort of like those little knobs that used to be on the dash of the older diesels that you would turn for warm-up?

M

Electronic idle control. The NA has them.

I wouldn't suggest a 606na, it has more power than the 603na, but still short of the turbo 603 and 606, even at sea-level. To go through the trouble of an engine swap and still run an na? Seems like a waste of time and money.

__________________

Gone to the dark side

- Jeff

No, it's changing the resistance or voltage or something of an electrical signal. The car has a mechanical RPM stop that exists just to "catch" the engine down at 500 rpm or so before it dies. Factory spec is 630 rpm and this is done electronically. There's a plug that plugs into the back of the injector pump that comes from that trimming knob. By varying the voltage or resistance or whatever gets varied, the injector pump speeds up or slows down the car's idle. It's to let it maintain a constant 630 rpm idle no matter what the circumstances are. Engine starts dragging from A/C compressor load, computer bumps it back up to 630. Engine surges up from... whatever makes it idle fast, computer brings it back down.

__________________


~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL

Babymog thanks for the input. I was just thinking that I could (as this is my daily driver) live with the 606 n/a if it had adequate power. I have yet to drive one to determine if I would be satisfied with the performance.
Bustedbenz I will do a little scouting for the dial. The unit on the back of the pump is I believe an electromagnetic switch. Thanks for the suggestion. I will let you know what i find.

Mark

Based on the performance of the 97 E300D that I drove, the 300GD that I drove and knowing how much more even a SWB G weighs I would say that you would be barely satisfied with the performance. Go with a turbo engine.

__________________
1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."

Great thanks for the input. So from what I have read for a 606A transplant:
1. Mating an element updated fi pump from a 603A.
2. The turbo from the 603A so that you can have a vacuum operated wastegate.
3. The 4 speed tranny that I have should work fine.
4. Engine mount arms rom my existing engine should mount up to the 606 in the same position.
5. Air cleaner and exhaust plumbing need to be sorted out.

For a 603A transplant:
1. Air cleaner and exhaust plumbing need to be sorted out.
2. ALDA wiring
3. The 4 speed tranny that I have should work fine.

Am I missing anything?

Mark

Just checking, but have you verified fuel flow? Our old diesels will run fine but weak with poor flow.

__________________
James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
www.engineeringworks.biz
1987 300SDL junker 170k
1982 300SD junker, 265k

No I have not. This goes to my first question if the flow is not adequate will larger elements make a difference?
As i mentioned the PO had the pump rebuilt. So I wanted to see if I could squeeze a bit more power out of it.
M

I think by adequate fuel flow, he's thinking of fuel tank screen, primary and secondary fuel filters, and fuel tank vent. if any of those are plugged, you will have issues getting speed on the highway.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Good point. I am very anal about filter changing and Diesel Purging each change but have not taken my pursuit to the tank. I will probably pull the tank sender and do a little fishing. I will wait on the screen till I am on empty.

Mark