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DumHed
Experienced Roboteer
Joined: 29 Jun 2004
Posts: 1219
Location: Sydney
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Well, the engine's a bit more together now, and has the new turbo on it.
I had to replace the whipper snipper engine with a 300w scooter motor to get the oil pump working, but it now makes plenty of oil pressure even at 12v.
Last night I got it running properly, and it sustains 15psi of boost with the lpg valve wide open.
I need to look at liquid fuel, or at least a way to prevent the lpg cylinder from icing up to get more power out of it.
The next step is to put a thrust nozzle and an intake bellmouth on it and measure the thrust (if any )
Once I have it working in thrust mode I'll be putting together a freepower turbine setup and hopefully driving something with it.
Here are some pics:
The oil cooler / tank is a small Nissan intercooler with some plates over the normal inlet and outlet and the usual pipe fittings.
I need to add a cooling fan to it as it heated up quite fast!
Oil pressure is regulated by a Malpassi fuel pressure regulator, which ramps up the oil pressure as the boost rises.
The oil filter mount came from a Nissan SR20 engine, and I made a custom backing plate with the pushlock and compression fittings in it. There are o-ring seals between the filter mount and the plate.
The turbo is from a recent model Nissan patrol turbo diesel.
It's quite small (40mm inducer and turbine exducer), but has a variable vane turbine housing and a 9 blade high flowing turbine wheel.
The ignition system is a 555 timer based coil driver as used in a Jacobs ladder display.
The oil pump is now driven by a 300w 24v scooter motor with a custom alloy pulley and a timing belt tensioner from a Nissan CA18 engine. At 12v the pump spins at about 600rpm, which is enough to maintain 60+psi of oil pressure.
If I end up needing more flow I can run the motor at the full 24v
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The Engine Whisperer
- fixer of things
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Tue Dec 13, 2005 11:02 pm |
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DumHed
Experienced Roboteer
Joined: 29 Jun 2004
Posts: 1219
Location: Sydney
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hmm that'd work really well actually!
The turbo also has a water cooling jacket that's not used at the moment, so I could quite easily use that for vapourising kerosene or other liquid fuels.
I'll be making up some different injector setups for it to try different fuels anyway.
As for power, it's certainly most efficient at making heat and noise, but apparently it is possible to extract decent shaft hp.
There's a guy in NSW with a turbo turbine powered motorbike that's making over 100hp at the rear wheel, and he's also done a go kart which has the normal go kart chain drive directly from the power turbine shaft. Since peak power is at something like 32000rpm it has a pretty high top speed!!
The usable power output seems to work out to about 1hp for every pound of thrust the engine makes in pure jet form.
I think it would be reasonable to expect to make 15-20lbs of thrust out of my engine with the right nozzle, and it seems pretty well suited to the large power turbine I have
If it works I'll be putting it in a small boat I have, driving a waterjet unit from a jetski.
This project will have to take second priority for a little bit though, while I work on my car, and then robot so I have something to take to robowars
quote:
When does the afterburner go on Andrew?
If I do the power turbine setup it won't have an afterburner, but otherwise it'll get one for sure _________________
The Engine Whisperer
- fixer of things
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Wed Dec 14, 2005 8:44 am |
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