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Post by andym on Oct 1, 2021 1:35:07 GMT -5
Hi John
Yep works,
Looks wonderful
Hope to see it making noise soon
All The Best Andy
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Post by racket on Oct 1, 2021 3:59:16 GMT -5
Hi Andy
70 psi of oil pressure and she still spins easily :-)
More testing tomorrow
Cheers John
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praendy2203
Veteran Member
Joined: August 2020
Posts: 181
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Post by praendy2203 on Oct 1, 2021 16:23:13 GMT -5
Hi John,
looking awesome👍
A real ashtray for men.
Take your time before the first run and take a big strap, to fix it on your tree in the yard.
Andy
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Post by racket on Oct 1, 2021 16:33:24 GMT -5
Thanks Andy
Yep , she'll be secured to a tree for idling tests just in case I give it a tad too much fuel , then taken to my test area out of town where it'll have a chain on it :-)
Cheers John
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Post by racket on Oct 1, 2021 23:05:49 GMT -5
Hi Guys Engine on the test stand youtu.be/LX6M2BpvfeETime to start spraying fuel and letting Andy M's ignition system fire it off :-) Cheers John
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Post by pitciblackscotland on Oct 1, 2021 23:30:51 GMT -5
Hi John, good luck with the test run That ignition system sounds sweet Cheers, Mark.
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Post by racket on Oct 2, 2021 0:21:01 GMT -5
Hi Mark
LOL.....the ignition is powerful :-)
The other day as I was preparing to mount the ignition box I thought I'd better make sure it was working as it'd been sitting in the cupboard for a while , when I hooked it up to a battery on the bench it didn't work ,.... bugger !!
So opened up the box that Andy mounts things in and was doing some voltage checks on the parts and found "abberations" , so hooked up the battery charger to the 12V battery to get 14 volts into the system .
A second or so later there was an almighty bang , I thought I'd shorted something out , it scared the crap out of me ..............silly old fart , it was only the plug firing off .
The fault was the 12V battery , one of my 24V starter pack for the 12/118 engine , it seems the pair of cheap batteries had reached the end of their life , 5 years was it .
Using the 12V battery on the test stand it works just fine .
I've purchased a 65cc backpack leafblower for doing some initial fuel ignition trials , less stressful than a short duration scuba spoolup if things don't go right , once I've finished with using it for the engine it'll come in handy around the yard for all the leaves , its much better than my 20 year old 26cc hand held blower :-)
Just waiting on some flexible hose go from blower to engine inlet .
Cheers John
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Post by andym on Oct 2, 2021 6:21:39 GMT -5
Hi John Looking good, just ad fuel and your away Ignition does sound good, did well to run that long 70 psi is good on the oil, spins nice as well, should make starting with leafblower easier Like how you have test stand sorted now, will be very interested what you can get the idle down to Chatt soon, good luck with first run All the best Andy
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Post by racket on Oct 2, 2021 20:13:54 GMT -5
Hi Andy
Yep , I'll try and get idling down to under half a Bar of P2 .
Currently trying to find a plastic funnel to seal against the bellmouth, need a ~7-8" mouth on it and flexible enough to conform to the bellmouth for a good seal .
Yep , spins easy :-)
Cheers John
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Post by finiteparts on Oct 3, 2021 10:38:20 GMT -5
John,
That engine is looking good! Can't wait to see you fire it up.
What kind of oil flow rate are you targeting? Did you base it on other large turbos or did you have an idea of the oil flow on the original application?
- Chris
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Post by racket on Oct 3, 2021 16:38:52 GMT -5
Hi Chris
I'm using the same oilpump as I did for previous engines which provides ~10 litres/min at 50 psi ,
Heres a summary from the 12/118 build ................
Some data from the testing ..............
Electric motor is 24 V 500W at 2500 rated rpm with a rated 27 Amps capability, currently run on 12 Volts through a 20 Amp fuse.
Oil used is 5W-40 full synthetic at ambient temp ~20 deg C
At 65-70 psi with the output valve from pump closed resulting in recirculation through the pumps internal relief valve the motor/pump ran at 1180 rpm , but working hard by the noise it was making .
At 60 psi it flowed a measured 6 litres per minute ( LPM ) , still some recirculation through relief valve as rpm at 1156 rpm
At 50 psi it flowed a measured 10 LPM at 1195 rpm
At 0-5psi with the throttling valve fully open it flowed >12 LPM at 1365 rpm
The actual battery charge changed a bit over the differing tests so some variables with rpm , but it appears that at pressure producing flows the rpm are up ~1200 rpm with a healthy 50 psi of pressure and 10 LPM available .
I ran the pump at 60 psi for 15 minutes , the 5 litres of oil started to warm up a bit , possibly a 15 deg C rise , the motor barely changed temp ......
As the new engine will be even thirstier than the 12/118 my run times will be less so the oil barely has time to reach a point where it starts to thin out and for the pressure to drop to the relief valve setting , with a stronger spring I should be able to maintain 70 psi.
The TF15 bearings are only a tad larger than the TV94 so I don't expect a lot of difference in flows , the TF15 has less thrust bearing clearance and is a more modern design with a larger surface on the main thrust side but still a proper thrust bearing on the "endfloat" side .
With the engine static theres not much flow coming through it at present , it'll be interesting to see how that changes once underway, I'll keep you posted :-)
Cheers John
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Post by racket on Oct 4, 2021 17:31:23 GMT -5
Hi Chris
I did a bit more searching for lube pressures on the Mitsubishi S6R2-PTAA engine the TF15 turbo is off and the engine's main oil gallery pressure is between 0.5-0.65 MPa , ~70 - 90 psi , undoubtedly there'll be lower pressures by the time the lube gets to the "extremities" , so I think if I can maintain 70 psi things will be OK .
Cheers John
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Post by racket on Oct 4, 2021 23:49:20 GMT -5
Hi Guys
I did a "pressure test" on the leafblower and found it can produce 12" of water column when the flow is restricted and ~9 inches when unrestricted .
As the flexible tubing is taking its time getting here I rigged up some 90mm stormwater plastic pipe and attempted an ignition .
Things were a tad "rough" , fuel spewing out the jetpipe , several attempts before cracking the fuel valve a fair way open to get some atomisation and then reducing flow once ignition occured .
She now smells like a real jet engine , kero rather than cutting oil and degreaser, and the turb wheel has some nice purpleing .
I probably got about half way up the spoolup , she was starting to howl a bit but the flame at the exhaust wasn't looking like retracting back into the engine , so spoolup abborted .
I'll do some fuel flow testing to sort out what prestart settings I need on the dump valve, I'm currently using the 12/118 settings , but it had 18 injectors whilst theres only 9 now . .
Its getting closer , but still have no idea how much starter power will be required to accelerate a 10 lb rotor to 25,000 rpm , though the bearing friction is reasonable, especially once things warmed up a bit .
Stay tuned :-)
Cheers John
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Post by andym on Oct 5, 2021 3:20:06 GMT -5
Hi John
WOW......
Am sure you will get your head around it, may be spool first... then fuel and spark ?
So looking forward to seeing it run
All The Best Andy
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Post by smithy1 on Oct 5, 2021 20:28:44 GMT -5
Currently trying to find a plastic funnel to seal against the bellmouth, need a ~7-8" mouth on it and flexible enough to conform to the bellmouth for a good seal . Yep , spins easy :-) Cheers John John, I used a rubber plumbing fitting/reducer for the 6041. Bought it from bunnings in the plumbing section....like the ones which the toilets use between the bowl and subfloor pipes etc... much better than a plastic funnel. I found one which fits nicely on the elephant trunk pipe and seals nicely on the bellmouth of the turbo inlet. You can just see it here near the inlet. Smithy.
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