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Post by enginewhisperer on Jan 17, 2023 21:12:02 GMT -5
bummer! It looked like a nice relaxed setup until that point
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Post by enginewhisperer on Jan 11, 2023 18:53:53 GMT -5
there's normally some play. If wheels are not touching the housings it should be fine. Even if they are, it'll usually be ok with decent oil supply A cheap oil pump that works ok for turbines is a vane type power steering pump. They're easy to belt drive using any convenient motor. I've used a 24v 300w scooter motor in the past with good success.
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Post by enginewhisperer on Dec 13, 2022 19:56:13 GMT -5
pulse jets are a bit quicker to build than turbines Even my very small one worked fine on the cylinder valve without a regulator.
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Post by enginewhisperer on Dec 11, 2022 15:12:08 GMT -5
many years ago I built a pulse jet using galvanised water pipe and fittings and a chainsaw reed valve. Basically a smaller and less fancy version of this!
Initially I tried to make it work with the chainsaw carburetor, but didn't have much luck. In the end I just fed propane into one of the vent line fittings on the carb.
It certainly worked, but it was ridiculously loud, and the neighbours were not impressed!
In the end I decided to see how long it would run before the reed valve block melted. It wasn't very long!
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Post by enginewhisperer on Oct 10, 2022 17:52:19 GMT -5
otherwise finding a second hand truck turbo is the best bet.
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Post by enginewhisperer on Oct 10, 2022 17:11:46 GMT -5
the main thing is any turbo with a larger turbine outlet than the compressor inlet is a good start.
In terms of small turbos, I had good success with a mitsubishi TC06 (I think), from a Cordia or Starion. It has a huge turbine compared to the compressor.
Most smaller turbos, especially from petrol engines, are designed to work with a wastegate and undersized turbine which doesn't really suit a gas turbine engine setup.
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Post by enginewhisperer on Sept 28, 2022 17:14:30 GMT -5
LOL, ..............you could mount it vertically and put a "chimney" on it and create an updated Da Vinci Chimney Jack that could be run slower and "colder" . I like this idea. Either mounting the whole engine vertically, or adding a long vertical exhaust pipe should get it to "run" even if most of the power is coming from the convection. The better the turbine and compressor work, the more fuel it will be able to burn and the more power it will make.
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Post by enginewhisperer on Jul 4, 2022 15:45:32 GMT -5
I bought one of the Detroit Diesel DD15 turbo compounding units but haven't had a chance to get it back from the USA yet.
It looks pretty good though for a small turboshaft setup
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Post by enginewhisperer on Jun 27, 2022 16:35:56 GMT -5
it's actually very easy with a brushless motor. The controller will act as a rectifier and produce DC output when it is not being driven (depending on the controller)
It can also be controlled actively to regulate the output voltage and shaft load.
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Post by enginewhisperer on Jun 27, 2022 16:06:07 GMT -5
I think a well done starter generator is probably the best system, but won't be easy to do. It might even make more sense to have a very small generator permanently coupled, and a higher torque starter engaged temporarily. A high speed generator (brushless motor) can be very small diameter and easily live in the intake area.
Another way people have done it in the past (not sure how successfully) is using bleed air to drive an accessory turbine.
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Post by enginewhisperer on Jun 23, 2022 21:58:27 GMT -5
that's looking pretty serious!
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Post by enginewhisperer on Jun 18, 2022 20:46:05 GMT -5
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Post by enginewhisperer on Apr 4, 2022 5:49:12 GMT -5
I was invited to run my car at World Time Attack this year, and since I wasn't going to be on my usual international team pit crew this year I figured it was a good opportunity! The car makes well over a tonne of downforce at the lower elevation and higher speeds of Eastern Creek Raceway, and with the night time running I decided some titanium skid plates and a front splitter camera were necessary youtu.be/Sa2brnGg9toI ended up 5th in the class, and beat some much more serious cars, although I wasn't really happy with the lap times I achieved. I need to get back there and do some more practice instead of turning up 5 years after driving at that track! There's also in car video of the final lap: youtu.be/35XNgalIbK8
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Post by enginewhisperer on Feb 5, 2022 20:07:42 GMT -5
big lathes are great if you have the space. Often they're super cheap because hardly anyone has the space, electrical power, or transport options required. I picked one up a few years ago with an ~80mm spindle bore, and it's been very handy having that capacity! It's also nice not having to keep switching chuck jaws to fit large things in it The lathe was $500, and the crane truck for a couple of hours needed to transport it was $600!
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Post by enginewhisperer on Jan 10, 2022 1:53:48 GMT -5
yeah it's not overly convenient! I plan to do a "surge tank inside the main tank" setup to run the Walbro pump, and will feed the surge tank from an external pump with the pickup in a "sump" at the bottom of the main tank.
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