| Author | Message | ||
| Laryn Christley (Barn_owl)
Registered Member Username: Barn_owl Post Number: 417 Registered: 10-2006 Posted From: 72.66.161.19  Rating: N/A |
What do the colors represent on the DD’s injectors? I often hear people give a color with their injector size. For example: Brown tag N65. How many colors are there and what do they represent? It looks like I have Black N70. There is not a tag, but the background the size is stamped on looks black. | ||
| Laryn Christley (Barn_owl)
Registered Member Username: Barn_owl Post Number: 418 Registered: 10-2006 Posted From: 72.66.161.19 Rating: N/A |
Add to that: What does the N stand for and are there different letters? | ||
| FAST FRED (Fast_fred)
Registered Member Username: Fast_fred Post Number: 316 Registered: 10-2006 Posted From: 208.100.193.34 Rating: N/A |
I understand the "tags" are different injection patterns. Some for La La Land , where visiable smoke takes precident to fuel economy. Others are for low power governed engines that need to respond to load changes differently from an over road engine. The N is the more rapid injection of engines built after 1956 or so. Till then the H series was used , but it was a bit more smokey than the N. Engines with H injectors can not be converted to N injectors with out installing later pistons. Seems the piston top swelled too much with the more rapid injection of the N units.At high loads the piston could stick, much ungood. DD simple cure was to raise the top ring a bit , which "mechanics" called high compression , although the compression was exactally the same. The number N 50 or N 105 represents the cc of fuel the injector is capable of delivering per shot. FF | ||
| joe padberg (Joemc7ab)
Registered Member Username: Joemc7ab Post Number: 247 Registered: 6-2004 Posted From: 66.38.159.33 Rating: N/A |
Fred N50 would be 1/20 of a liter per stroke. That seems awfully high, could it be ML (milli liter) ? At that rate you would not get very far on a tank of fuel. Joe. | ||
| Austin Scott Davis (Zimtok)
Registered Member Username: Zimtok Post Number: 252 Registered: 9-2006 Posted From: 216.37.73.226 Rating: N/A |
If memory serves me correctly when I replaced my injector seals about 2 years ago the injectors had the same "letter/number" but I had a couple that were brown and a couple that were orange-ish. I assumed that the color had faded and just finished the job at hand. SO... The question posed by Laryn not answered, does the color on the injector make a difference? . | ||
| Tom Caffrey (Pvcces)
Registered Member Username: Pvcces Post Number: 1193 Registered: 5-2001 Posted From: 65.74.72.93 Rating: N/A |
And when a designation like N60 is used, that should be 60 CC per 1000 strokes of the injector. If you do the math, you will easily be able to determine the full throttle fuel consumption for a given RPM. I don't recall what the stroke rate is for the tests, but the injectors are a little more efficient at higher rates, AFAIK. This is the reason that a frozen rack will cause an engine to run away. For what it's worth. Tom Caffrey PD4106-2576 Suncatcher Ketchikan, Alaska | ||
| guy bouchard (Guy_bouchard)
Registered Member Username: Guy_bouchard Post Number: 13 Registered: 11-2004 Posted From: 161.184.180.225 Rating: N/A |
Brown tag inj were used in engines that were changed to advanced timing. N injectors are "needle valve" C injectors used a "crown valve" and H injectors were "high clamp body". I don't know what the other colors stand for, but sometimes it has to so with the size of the spray orifice, the angle of the spray, or the number of spray holes in the tip. And some people say that Detroits weren't engineered correctly. Go figure. Guy 4905 | ||
| FAST FRED (Fast_fred)
Registered Member Username: Fast_fred Post Number: 322 Registered: 10-2006 Posted From: 208.100.193.196 Rating: |
And some people say that Detroits weren't engineered correctly. Go figure. For 1936 it was a great feat to get an engine with the installation versatility , reversability and long running life. Today its long past being "the best" but it works for me! FF | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 1116 Registered: 10-2003 Posted From: 71.58.48.228  Rating: |
Some of the newer models also have more and smaller holes for better atomization. I wouldn't mind having an injector that would run cleaner and more efficiently, but nobody checks into this area on the 2 cycles much anymore. Maybe setting an engine up with Calif specs. might work. The changes that were used out there several years ago might not create a noticeable fuel economy loss performance penalty. |
