Quote:
Originally Posted by Bio240D
Hi all,
Regarding the turbo 240D. The engine is a 616 four cylinder with a Garret/ Air Research T3 turbo added. No the fuel system is Not stock! It will smoke with only 5 pounds of boost at full throttle, but at 8 to 9 pounds it runs clean
( and makes more power!  ). I also run 3.07 gears and the large oil cooler from a 300TD which makes for a much happier engine at 75 MPH.
I realize that the Stock pop pressure for a 616 is 115 bar, but all of the turbos use 135 bar. The injectors I built are 135 bar turbo injectors. I did not shim the 115 bar injectors to 135 bar. I don't think you could. The 135 bar injectors use a much heavier spring and the piece that pushes on the back of the pintle is different too. Anyway, she runs like a scalded cat, which in 240D parlance means I can out drag a Yugo! I also don't have to get out and push on steep hills  .
I don't know why the Bosio Nozzles went to poo so fast. What I can say is that they did, and ALL of them did. I tested all four, and the spray pattern was lousy on all four. The other thing is that the design is obsolete. The pilot injection hole on the Bosch nozzles has been universal in MB engines since what, the early 70s? If the Bosio Nozzles are so wonderful why don't they at least match stock Bosch nozzles in technical sophistication? I'm really tempted to fire up the lathe and try making my own!
Cheers, Chris |
Bosio makes nozzles for non-turbo and turboed Mercedes. Were the Bosio nozzles you bought for a turbocharged engine or for a standard 240D?
Within the last 2 months I rebuilt my injectors with Monark Spray Nozzles. The Monarks also lack that hole drilled through the center of the pintel for the idle pre-injection but deal with it by grinding a flat spot up higher on the pintal.
The origional injectors from may car and a set I pulled from 82 300SD both have the above drilled pintles for that pre-injection at idle. On both those holes were completely plugged with carbon. All but one of the injectors in the SD set appered to pop test OK. Until you took a close look and found that the holes in the pintle were plugged. Even though they pop tested apprently OK they could not have been running correctly.
My point is that I do not know the cause of the problem with your Bosio nozzles but the solid pintel nozzles should be more reliable than the drilled pintle nozzles as there is nothing to easily plug up. Most Spary Nozzles on other engines with precombustion chambers or swirl chamber have Spray Nozzles with have nozzles with solid pintles (my Volvo and a bunch of VW Diesel Rabbits are a few) and they work.