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Post by Johansson on Nov 6, 2016 16:38:04 GMT -5
Not far away now!
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Post by Johansson on Jan 29, 2017 15:32:15 GMT -5
We did an attempt to test run the jet kick today, but no go. The engines work just fine once they are heated up, but the new oil pump can´t keep up the flow once the oil starts to get warm so we had to abort the test. First we tried with 0W30 oil, but the pressure dropped from 5kg to 3kg where the low pressure switch cut the fuel pumps. We changed the oil to 15W40 to hopefully get higher pressure, and with cold oil we bottomed out the gauge at 7kg with the regulator fully open. At this point we towed the kick to the nearby lake to give it a go, but when the oil heated up the pressure dropped below 3kg despite the regulator fully closed and the 4-stroke pump engine revving like mad... We are really glad that we found this out now and not at race day, we have some quick fixes to try before fitting an electric pump so some way or another we will have an abundance of oil pressure at Speed Weekend. Some video and pics were taken of the test starts in the workshop but you´ve seen it before so I won´t bother to edit and upload anything. Cheers! /Anders
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Post by racket on Jan 29, 2017 16:39:00 GMT -5
Hi Anders
Bummer :-(
You guys probably need a large automotive oil pump , something in the 20 LPM flow range at your IC engine rpm , the "little" Subaru oil pump I use has ~9-10 cc/rev flow , I generally have to run them at a "low" speed of ~1,000 rpm otherwise I have too much oil , the pump is normally driven off the end of the camshaft in the IC engine so 1/2 engine rpm , the 1,000 rpm of my electric motor equates to a modest 2,000 Subaru engine rpm , the pump would normally be capable of at least 2 to 3 times that rpm if driven by your IC engine.
Yep , very fortuitous that you found out now rather than on race day , you've got 3 weeks to get things sorted ..............LOL, plenty of time ;-)
Cheers John
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Post by Johansson on Feb 6, 2017 17:02:52 GMT -5
I just got back from my friend Olovs place where we test ran the jet kick sled before the Speed Weekend event little more than two weeks from now, the new dry sump system seems to work perfectly and holds a stable oil pressure even with high oil temps! We´ve also fitted an oil cooler in front to keep the temps at reasonable levels, with two S500 turbochargers the oil temps rise pretty quickly without any cooling. Keep your fingers crossed for a smooth ice track and lots of SPEED!!! Cheers! /Anders
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Post by racket on Feb 6, 2017 18:26:56 GMT -5
Hi Anders
LOL...............you nearly got a smile on Olovs face :-)
All the best for on the ice
Cheers John
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Post by jetjeff on Feb 8, 2017 1:47:58 GMT -5
Hi Anders,
I hope you have good ice too. Odd winter here in Michigan, more rain than snow, but at 55 I get tired of shoveling snow. I'm not so sure global warming is a bad thing,,,lol.
Regards
Jeff
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BFTO
Veteran Member
Joined: February 2016
Posts: 128
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Post by BFTO on Feb 8, 2017 5:54:24 GMT -5
Hi Anders, I hope you have good ice too. Odd winter here in Michigan, more rain than snow, but at 55 I get tired of shoveling snow. I'm not so sure global warming is a bad thing,,,lol. Regards Jeff The winter in Sweden is really strange to, minimal snow but today it is -20C. Looking good Anders/Olov, see you at Årsunda! I have a feeling it will be 175 km/h this year, what is your prediction? 200+?
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Post by smithy1 on Feb 8, 2017 14:00:26 GMT -5
Love your work Anders & Olov...Nothing better than the noise of two screaming turbines bolted together.
You guys are a credit to our little community.
Cheers, Smithy.
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Post by Johansson on Feb 8, 2017 14:51:03 GMT -5
Hi guys, A really shitty winter here indeed, rain, ice, and the occasional day with -20°C before the mild weather returns... Judging from the official ice reports the race track is progressing nicely so far with sub zero degrees most of the time, so we can only wait and keep our fingers crossed. BFTO: Make sure to drop by and say hi, I am very absent minded during the race weekends so grab a handful of jacket and make sure I understand who you are. 175km/h sounds realistic if everything works like it should, for >200km/h we will probably need some sort of fairing and possibly even water injection to get the last bit of thrust out of the engine. Cheers! /Anders
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Post by Johansson on Feb 8, 2017 14:54:00 GMT -5
Love your work Anders & Olov...Nothing better than the noise of two screaming turbines bolted together. You guys are a credit to our little community. Cheers, Smithy. Thanks a lot Smithy, the twin turbine really has a unique sound to it. Especially with the afterburner running at full bore, you can see the raw fear in the face of some spectators when it screams at its highest pitch. Just happy to be part of the crew. Cheers! /Anders
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Post by smithy1 on Feb 8, 2017 15:44:53 GMT -5
Just happy to be part of the crew. Cheers! /Anders I know exactly what you mean with the "raw fear" of the spectators, the 6041 go-kart at "full noise" certainly gets their attention...John and I have witnessed it many times..!! LOL... Cheers, Smithy.
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Post by racket on Feb 8, 2017 16:23:40 GMT -5
LOL..............fortunately us operators have had more experience at concealing it ;-) .............they still scare the crap out of me, which is probably a good thing as it keeps me from being too "adventurous" with the throttle.
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Post by Johansson on Feb 8, 2017 16:30:37 GMT -5
LOL..............fortunately us operators have had more experience at concealing it ;-) .............they still scare the crap out of me, which is probably a good thing as it keeps me from being too "adventurous" with the throttle. We are so used to the loud BANG when the afterburner lights that we hardly notice it any more, but with the twin turbine running with full AB I tend to get a bit nervous. One hand twitching and just waiting to hit the shutdown button on the dashboard the second something sounds wrong.
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Post by racket on Feb 8, 2017 17:27:32 GMT -5
Yep , a lotta flow coming from those two compressors , the A/B lights nicely , there should be some good speeds and times
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Post by smithy1 on Feb 8, 2017 21:41:40 GMT -5
LOL..............fortunately us operators have had more experience at concealing it ;-) .............they still scare the crap out of me, which is probably a good thing as it keeps me from being too "adventurous" with the throttle. LOL...I have a "throttle stop" for just such an occasion!! Like you, I know the safe operating limits of our engines and do my best to never exceed them....it's pointless really as there's no performance to be gained by going outside the known limits anyway..! They can only flow "X" amount of air....trying to stuff more through them is getting into "dangerous territory"... Cheers, Smithy.
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