1HZ "Turbo" injectors (2 Viewers)
- Thread starter ForealBoreal
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- Thread starter
- #22
Yeah your diesel will always use the smallest amount of fuel needed to move the vehicle. Matching gears more to your peak torque can have a good affect on fuel economy. Larger plungers can also have a bennifical affect as it can shorten the injection stroke and deliver the same amount of fuel faster. This can alow for slightly less timing and give you cylinder pressure where it can be more useful for the eninge instead of a long injection stroke that begins to build pressure long before TDC creating higher peak cylinder pressures, but not making more power for the engine. This also stresses the engine out alot as well. Here is a pic.
I think your boost compensator will save you fuel in that it wount inject alot of fuel unless you have enough air to burn it. In my mind this applied to accelerating situations and not for steady state. It would be the equivalent of haveing a carb that wount allow the secondaries to open right off idle, but delays it until the enigne can burn it more effeciently. It would limit over fueling.
Diesel Central recently did a 1HZ with 200hp at wheels (Gturbo Grunter 2 @ 22psi) and the injectors were std spec. For all the TD42 engines, the injectors are also usually std even in the 250-300whp range. Some however do custom injectors above the 250whp range.
I wouldn't worry too much about pump wear. Yes higher cracking pressure does put more strain on your inj pump[, however when you consider that the DI engines also use the same type of pump and they last a similar time (~200kkm), it wouldn't be something to worry about.
I wouldn't worry too much about pump wear. Yes higher cracking pressure does put more strain on your inj pump[, however when you consider that the DI engines also use the same type of pump and they last a similar time (~200kkm), it wouldn't be something to worry about.
- Thread starter
- #26
Good to hear! I am dreaming up something nasty for my 75.
What are the limits of the 11mm 1hz pumps hp wise?
would love to hear more about that 1hz.
any other big hp ones?
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Limit of 11mm pumps are baed a lot around who builds them. Std 1HZ pumps are all 10mm pumps - easy to tell from part number on pump.
The 200hp @ wheels was an 11mm upgrade. They are good for ~ 230whp, possibly 250. The 12mm are good for over 330. 14mm custom heads from the USA are apparently not great and a lot has been done with them here. Just not been able to make a nice running engine and keep pump reliable.
The 200hp @ wheels was an 11mm upgrade. They are good for ~ 230whp, possibly 250. The 12mm are good for over 330. 14mm custom heads from the USA are apparently not great and a lot has been done with them here. Just not been able to make a nice running engine and keep pump reliable.
- Thread starter
- #28
Well I figure 11mm should be just fine and a substantial upgrade.
I was told that the later 1hz pumps (99+) were upgraded to 11mm plungers from the factory along with the different injectors that have a slightly different spray pattern because of the head changes and precup design.
I assume they can tune the pump to suit the older injectors with the different spray pattern.
I am now on the hunt for a few good priced pump. Ideally I would love to find one of the newer 1hz pumps off a 105 series that has the boost compensator already on the pump. Even a 1hd-t or hd-ft pump.
Tapage
Club 4X4 Panamá
aren't 1HD-T ( FT ) pumps fitted from very beginning with 11mm plunger .?
- Thread starter
- #30
12mm for the direct injection engines from what I have read.
Well I figure 11mm should be just fine and a substantial upgrade.
I was told that the later 1hz pumps (99+) were upgraded to 11mm plungers from the factory along with the different injectors that have a slightly different spray pattern because of the head changes and precup design.
I assume they can tune the pump to suit the older injectors with the different spray pattern.
I am now on the hunt for a few good priced pump. Ideally I would love to find one of the newer 1hz pumps off a 105 series that has the boost compensator already on the pump. Even a 1hd-t or hd-ft pump.
I was told this about the later 1HZ pumps but have not found it to be true - the number on side of pump tells the story. I can't remember the numbering system but there should be a 10/11/12 number near a 6 (for 6 cyl).
DI pumps have a different timing curve - not what you need with a 1HZ
All 1HDT/FT pumps are 12mm
- Thread starter
- #32
Thanks for the info Graeme.
Here is a 1hz pump label.
Here is a 1hz pump label.
There is nothing to adjust on the injectors. Pressure and volume per pulse is all controlled by the pump. You can swap out injectors without changing anything if needed.
if there are quality injectors they should be shimmed to the correct pressure already.
mechanical fuel injectors opening pressure is adjusted by shims.
Thank you @bussman. I was gonna avoid getting a pop-tester then caved in after this thread.
Any specific recommendations as to a reliable brand? I contacted @mercedessource.com (as above) and they said theirs wouldn’t be suitable
i have their tester, i can't see why it wouldn't work. goes up to 3000PSI I'm sure the 1hz spec is lower then that. I've even done several sets of direct injection injectors with it and those are higher pressure.
