I dont know how these will react in our engines, but they wont have the extreme injection duration like the 3m injectors which is what causes the high cylinder pressure that can break pistons.
Not with this kind of atomization
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Me too. This seems like a potential game changer to me.excited to see how these would do in our engines.
Just finished up the idle calibration, lost a bit at lower rpms but was able to get some more hot cranking fuel just by setting the pump for no housing pressure all the time. This pump is pretty overbuilt for just the 140cc it peaks at, with the input thrust bearing setup and locked timing, but it will take all the abuse you can throw at it and should perform really well. The fuel curve is pretty impressive, not the biggest numbers but a very flat curve, its more like a db4 curve than a db2, learned some interesting things with this pump, I think the governor setup we put together has a lot to do with how flat the fuel curve turned out, and I went ahead and ordered the rest of the parts to build more like it, unfortunately theres only enough to build four more pumps like this, and I bought every one in the country. Im hoping I can find a company that can take these governor springs and minimax and replicate them for me, so I could put together a db2 upgrade kit for people to put a new governor, metering valve, delivery valve and set the pump up to monitor transfer pressure with just using their stock pump or modifying a junkyard pump, and be able to build a 300+hp capable pump themselves for only a couple hundred bucks, thats the plan anyways, still got to figure out a way to reproduce these parts to keep the costs down.
Heres the marine pump:You must be registered for see images attach
And for comparison my 150 db2 and the db4:
You must be registered for see images attachYou must be registered for see images attach
What kind of issues did you experience with the higher governed rpm?I have had a rocker arm come loose, for one... I've got that on video. That was a bit over 4K.
I've also had throttle cables stick more than once, so I can't count on the driver being able to keep things 'safe'.
Gas engines(well, carbed ones), didn't have a governor either(usually)... and I don't like that.
If you want to be able to rev your engine up to defuel on every shift I can build a 90cc pump with an earlier defuel but you will lose the advantage of the flat curve because of the gradual defuel these governors have. Nothing unreasonable about a 4k+ governor setup, many pumps came this way stock from stanadyne, and its only a few hundred rpm higher than the factory max rpm setting.
What's the actual defuel on yours then? I want to find a happy medium here - flat as far as I can, but a 'safe' defuel so I won't grenade the motor if, say, the throttle cable sticks wide open for a while.
You sure can, just as long as you have a pyro and aren’t expecting a smoke free exhaust while na, I’ve have several customers run 90s on na trucks while they build turbo kits and work out bugs on fresh projects. I do not recommend running stage ones with a 90cc pump, save your money and get stock injectors. These injectors are pretty big already and without running a 100cc+ pump you’re really not going to bet anything.Wes,
Can your 90cc pump and upgraded injectors be used on a stock na motor? I plan on getting my turbo installed one day but probably won't before a pump and injectors.