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Post by racket on Mar 6, 2024 15:49:52 GMT -5
Hi Richard
I was already onto it :-)
When I used it for measuring pressures at the NGV outlet I found it very easy to bend into the shape I needed .
Thanks again for sending it , much appreciated :-)
Cheers John
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Post by racket on Mar 27, 2024 3:28:04 GMT -5
Hi Guys
Testrun today ..............no big improvements , though I now have a better idea of "average" turb temps :-)
Cheers John
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Post by racket on Mar 29, 2024 19:34:48 GMT -5
Hi Guys Few rough mods to the jetpipe . A central tube to fair the wheel hub and prevent turbulence within the jetpipe , 3 straightening vanes/supports , and a very short nozzle section Hopefully it might make some difference Cheers John
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Post by racket on Apr 3, 2024 23:01:54 GMT -5
Hi Guys
Testrun yesterday afternoon ....................no success , couldn't get her fired up , hung starts , ......jet nozzle might be a tad too tight , though the starter might be starting to "fade " , I've noticed that spoolups haven't been as good as when I first fitted the new starter some time back , too many 24 volt starts on a 12 volt unit , might need to clean up the commutator and look at the brushes .
I'll do some dry spoolup tests to get RPM numbers first, with and without the jet nozzle to compare with data I have .
Cheers John
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Post by racket on Apr 4, 2024 23:43:10 GMT -5
Hi Guys
Bit of an update on the starter .
RPM of motor with 70 psi cold oil ~22 deg C and fully charged batteries was 9,500 rpm , ~15% N1 which should be enough to get a successful spoolup with some fuel burning .
Without the jetnozzle and with recharged batteries and same oil , 9,950 rpm , not a lot of difference , maybe ~10% of starter power being used at the jet nozzle constriction.
Pulled starter apart and it looked OK inside so didn't machine anything , a bit of fresh grease in the gearbox and back together .
I did find a couple of "hot" fitting on the battery pack after testing , so cleaned them up and retightened them as they were a tad loose .
On viewing the gauge video of the failed testrun I noticed my fuel pump pressure dropped to virtually zero whilst the starter was activated , the pump is running off the 24 volt battery pack .
So maybe it was a combination of poor conduction through the fitting and the starter sucking all available power leaving the pump doing nuthin'
Hopefully next testrun will be successful :-)
Cheers John
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richardm
Senior Member
Joined: June 2022
Posts: 258
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Post by richardm on Apr 5, 2024 4:55:08 GMT -5
It doesnt take much corrosion or dirt on a connector to keep low voltage from going through and causing high resistance. Long time ago my car starter did not work. Mechanics replaced it but the new one failed about a week later. Decided to look at it. Found the connector was green with corrosion . Cleaned it and went good. Payed for a new starter while all it needed was a clean connection..
So unless your batteries are getting bad that should be the cause... Are you running on deep cycle batteries or car batteries?
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Post by racket on Apr 5, 2024 16:22:05 GMT -5
Hi Richard
A couple of 12V car batteries , they're only a few years old and I keep them fully charged .
I found it "interesting" that the hot fitting bolt wasn't all that tight, things might have "settled" over time , don't know , but hopefully a fix and things work OK now .
I've got the power for the fuel pump taken off at the starter solenoid input , with very heavy cabling from batteries to solenoid, so I can't do much more to power the pump .
Cheers John
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richardm
Senior Member
Joined: June 2022
Posts: 258
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Post by richardm on Apr 5, 2024 18:35:38 GMT -5
Nice to see it was a simple fix Were I live they sand and salt the icy roads and that take a toll on cars We often use grease to protect the car battery terminals from corrosion You can get a special silicon based dielectric grease for that purpose Corrosion free terminals for years. About your batteries: You probably know that car batteries are not designed for sustained loads like your fuel and oil pumps. Its possible that they ve lost some of their capacities. Deep cycle batteries would be better but are more expensive, ..if you ever think of replacing em. www.linkedin.com/pulse/deep-cycle-battery-vs-car-boney-maundu/
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Post by racket on Apr 5, 2024 23:16:16 GMT -5
Hi Richard
I use two 330 CCA 12V batteries in series for starting and the fuel pump , for the rest of the bits theres other batteries including a deep cycle one .
The 044 fuel pump draws ~15 Amps on 12V so not much on 24V , the coupla car batteries should cope with 5 minutes worth of run time
Hopefully all will be well , it looks like the terminal fittings simply "relaxed" over time and I never noticed it :-(
Cheers John
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Post by racket on Apr 8, 2024 1:54:50 GMT -5
Hi Guys
Another unsuccessful attempt this afternoon :-(
Might have to be a bit "creative" to find a solution .
Cheers John
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ripp
Veteran Member
I'm sorry, I don't speak english, so I torment you (and myself) with a translation program,Sorry
Joined: January 2013
Posts: 230
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Post by ripp on Apr 8, 2024 2:50:15 GMT -5
Hi John,
I'm curious to see what direction you're going in.
Ralph
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Post by racket on Apr 8, 2024 3:54:16 GMT -5
Hi Ralph
Theres a very large drop in fuel pressure as the starter is activated , I'm going to explore setting up a bespoke 24 volt power supply for the fuel pump.
I'll do some testing of options tomorrow .
Cheers John
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richardm
Senior Member
Joined: June 2022
Posts: 258
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Post by richardm on Apr 8, 2024 4:43:49 GMT -5
If your fuel pump is running ok when the starter is off and the pressure drops when its turned on I wouldn't change anything but the batteries. Maybe you could take those to a garage and have em checked for capacity. Im assuming here that the same system was previously working fine... You said earlier that the starter was starting to "fade".. That also points to the batteries.. Testing the voltage on such a batterie doesnt mean much It can stil show a little above 12 volts but has lost its Amp capacity.
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richardm
Senior Member
Joined: June 2022
Posts: 258
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Post by richardm on Apr 8, 2024 5:35:41 GMT -5
And my understanding is that you re using two batterie in series Then only one of the two could be bad You might not need to replace both..Have em tested.. And in an ideal world those two batteries should be of the same voltage and capacity Otherwise one is "forcing " current trough the weaker one wich will eventually damage it.
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jetric
Veteran Member
Joined: December 2014
Posts: 132
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Post by jetric on Apr 8, 2024 7:15:45 GMT -5
It's because you are taking the power for your fuel pump at the starter motor terminals, the voltage drop at the starter motor terminals will be substantial when you turn on the starter. Run separate wires for the fuel pump direct to the battery terminals. Richard S. Hi Ralph Theres a very large drop in fuel pressure as the starter is activated , I'm going to explore setting up a bespoke 24 volt power supply for the fuel pump. I'll do some testing of options tomorrow . Cheers John
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