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Jet Pumps / Re: Possible pump locking up.
« on: September 05, 2015, 10:00:52 PM »Ray

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No cow bell? No deal!
Good to see you're alive n kickin Ray.
1978 Sleekcraft Rebel Jet Boat FFAAASSSTTT $7000
http://losangeles.craigslist.org/sgv/boa/5146504054.html
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Im not sure what the CFM numbers are for carbs. Stack injection has one butterfly per hole, which in this case are 2-5/8" butterflies. The injection doesn't fire like electrical injection. The Mechanical set up is a constant fuel system. There are 8 injectors that are constantly putting fuel down the cylinder. There is a distribution block that increases flow into the injectors as you move the throttle. The rate is regulated by one (pill) or jet. Tuning is backwards from a carb set up. If you want to lean out the system, then you use a bigger pill, to reduce fuel pressure. Richer you use a smaller pill to add fuel pressure into the system. The injectors come in lots of sizes. The injector size is like a power valve or accel pump in a carb. it allows only so much fuel in the cylinder. The more pressure will ad more fuel but that's why the fuel pumps are flowed. The mechanical fuel pump doesn't run only one flow. As the motor increases RPM the pump, pumps more fuel increasing the pressure. Its a real simple system once you understand how they work. Hopefully this helps and doesn't confuse you more. Ill be in parker this weekend if you see me come by and I can explain it more by showing the parts.
The Beav
It's not a terrible pump but don't expect to see and faster than 45 ish. It's meant for larger cruiser boats. It's more of a high volume low pressure pump opposed to a high pressure low volume berk pump.
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Ray you better buy it back
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Rayson
SOB WAS FAST! It had a TH400 in it and I never did get it into 3rd gear. Have a pair, 75 plus shipping.
I have an "as new" pair that will fit, provided 4 bolt hookup, and a VERY nice useable set, but not gonna approach THAT price....... 
Does anyone know any history on Race craft hulls. My uncle has a hull that is a 1972 Race craft V-drive. Just trying to find a little info on the history of that make of hull. If anyone has any info that would be great. Thanks



Nope not for a ford sorry. I love the stacks as well they work perfectly, plus they look bad ass.
Who ever picks these up they will be happy. Don't be scared about what people say. Everyone will tell you that you cant run them, well you can. People have seen me run them. It just takes a little learning. This is my very first set that I have ever run and I was able to do it. I will help anyone out that needs it too. I have learned a lot about this type of injection.
The Beav

THEE Hallett Dave, lover of river kids and river bovines too.
