steamn51
Member
Joined: March 2016
Posts: 14
|
Post by steamn51 on Apr 17, 2016 7:03:25 GMT -5
Hi all
Almost at the start up point with my project and wondered which is the best oil to use.
Using a combustor I made in 1996 which a very large turbine. Bit conservative now and using a T3T4 unit.
So just need to add the oil and spool up.
Trying to upload pictures but no luck yet.
cheers
Andy
|
|
|
|
Post by racket on Apr 17, 2016 16:20:55 GMT -5
Hi Andy
A synthetic 5W-40 oil will do the job nicely
All the best with the spoolup :-)
You mention that its a T3T4 unit , hopefully the compressor inducer isn't bigger than the turbine exducer as you might have difficulties getting it to run .
Cheers
John
|
|
steamn51
Member
Joined: March 2016
Posts: 14
|
Post by steamn51 on Apr 17, 2016 21:04:29 GMT -5
Thanks for that John.
I am not sure of those blade sizes but will wait and see I guess.
Cheers
Andy
|
|
|
|
Post by smithy1 on Apr 18, 2016 2:56:25 GMT -5
Whereabouts in Sydney are you Andy?...We might be able to get together, I'm in Campbelltown, so not too far away I guess, I might be able to give you a hand one day.
Cheers,
Smithy.
|
|
steamn51
Member
Joined: March 2016
Posts: 14
|
Post by steamn51 on Apr 18, 2016 5:25:33 GMT -5
Hi Smithy I am around the Moorebank area. Haven't gone to involved this time with the build, keeping the wiring simple until and if the thing works. Have taken my time to make sure oil system and ignition are 100% and of course the LPG lines.   |
|
|
|
Post by smithy1 on Apr 18, 2016 15:28:28 GMT -5
Cool....I go past Moorebank every day on the way home from work. LPG is a good way to prove an engine will at least run...it's very forgiving.
I suspect you haven't had it running as yet??
Can you give some details of the flametube and fuel injection etc..??
What sort of oil pressure are you seeing with your setup??
Cheers,
Smithy.
|
|
steamn51
Member
Joined: March 2016
Posts: 14
|
Post by steamn51 on Apr 18, 2016 19:04:57 GMT -5
Hi mate
About to test the oil pressure in the system, pump I hope is around 50psi.
The flame tube is a cone in shape, it produces good pressure with minimal flame out of tube, I believe this is what I need from when I first got involved in 96. Maybe things have changed since then?
The injection stem is adjustable within the cone.
Cheers
Andy
|
|
steamn51
Member
Joined: March 2016
Posts: 14
|
Post by steamn51 on Apr 20, 2016 5:05:56 GMT -5
Hi all,
I now have an issue with the new oil pump. 12v geared pump from Ebay, around 3/8" ID in and out ports.
Trouble is the outlet goes to the feed line to the turbine which is braided and has an ID of around 5mm.
Thus the pump doesn't like the back pressure load and its thermistor shuts the motor down.
Have I picked the wrong pump? Have I missed something?
Any advise?
cheers
Andy
|
|
|
|
Post by smithy1 on Apr 20, 2016 14:38:10 GMT -5
Hi Andy,
Looks like the pump is going into a hydraulic lock of sorts, do you know the outlet pressure?? It probably needs a relief valve in it's outlet system, easy enough to do..or...maybe you can just run a three-way by-pass tap in the pump outlet line, obviously one from the pump, one going to the turbo and the other going back to tank or back to the inlet side of the pump. You can then adjust the amount of by-pass to get the pressure/flow you require.
Most of us use automotive type oil pumps with their own internal relief/by-pass, these are then driven by a simple electric motor. My "Beast" uses an old Subaru oil pump which is bolted to an electric motor, very simple and trouble free so far. John designed/built this system originally, all I have done is fit an oil cooler and temp sensor etc...To be honest, it's so trouble free I've now forgotten about it when I run the engine...it just works.
Cheers,
Smithy.
|
|
steamn51
Member
Joined: March 2016
Posts: 14
|
Post by steamn51 on Apr 20, 2016 18:08:42 GMT -5
Thanks buddy
The 12v pump claims 50psi.Its a nice unit as its all in one.
Will chase up a 3 way and try it. Failing that will revert to the power steering pump.
Cheers
Andy
|
|
|
|
Post by smithy1 on Apr 21, 2016 14:40:15 GMT -5
Thanks buddy The 12v pump claims 50psi.Its a nice unit as its all in one. Will chase up a 3 way and try it. Failing that will revert to the power steering pump. Cheers Andy A simple 3-way valve should get you out of trouble, some use it for the fuel systems too...I think John uses a similar setup for his fuel system on his test bench. Do you have a link to the "all in one" pump..? Sounds interesting.. Cheers, Smithy. |
|
steamn51
Member
Joined: March 2016
Posts: 14
|
Post by steamn51 on Apr 22, 2016 1:11:33 GMT -5
|
|
|
|
Post by smithy1 on Apr 22, 2016 1:27:28 GMT -5
Yeah...that pump has no internal relief, no wonder it shite itself, I suspect it had pretty much a total hydraulic lock and current draw would have been fatal...hence the smoke escaping...! P/S pump should have an internal relief at least. Cheers, Smithy. |
|
steamn51
Member
Joined: March 2016
Posts: 14
|
Post by steamn51 on Apr 22, 2016 5:37:29 GMT -5
Lol mate, the smoke was due to the bypass wire I put in. It must be pump fest here as the ac motor I was just given has a jacking pump on the end which needs to be removed. See how things go tomorrow.
cheers
Andy
|
|
steamn51
Member
Joined: March 2016
Posts: 14
|
Post by steamn51 on May 2, 2016 5:44:22 GMT -5
Hi gents
After seeing Fidel running one of these 12v pumps which seems to be the same as mine I have the following changes.
Put in bypass ball valve and went to 3/8 copper feed pipe. The braided turbo oil line was only 4mm ID.
Questions,(5/40 full synthetic)
Is 25psi measured at oil into the turbo acceptable?
Am I right to think that when the oil becomes warm it will be less load on the pump?
Is the oil on the return side of the turbo fast running back to tank?
Does the spinning turbine decrease the resistance for the oil flow?
Must admit this oil bit has me tired. I tried a power steering pump with a 1hp 240v motor and motor nearly stopped. I didn't think a oil pump system would be so frustrating.
thoughts appreciated.
cheers
Andy
|
|
