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Post by Johansson on Dec 10, 2013 16:35:56 GMT -5
Hi John, No propane, it is an old helium cylinder we will use as an oil tank. We´ll probably fit a spark plug for the initial testing but if it fails to ignite with 100% accuracy at low throttle we have to try something else, no fun at all standing on the start line with the crowd and line of racers behind us (at a generous distance...) and not being able to fire up the engine. Been there... Cheers! /Anders
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Post by racket on Dec 10, 2013 19:37:02 GMT -5
Hi Anders
Yep, you need a positive ignition .
Chris' suggestion of the brake master cylinder for a hot streak is a good one , multiple shots if required.
Cheers John
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Post by pitciblackscotland on Dec 10, 2013 22:31:49 GMT -5
Hi Anders, Nice work on the jetkit project. Are you guys going to use air impingement for starting the twins?
Cheers, Mark.
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Post by Johansson on Dec 11, 2013 1:07:54 GMT -5
John: I totally agree, much simpler and no risk of HF interference with the electronics like last year.
Mark: We want to use air jets for starting, it all depends on how much time we have but I would gladly spend a couple of sleeping hours to get it done.
Are people aiming the impingement air on the comp wheel exducer or on the turbine inducer? Turbine wheel sounds more efficient but we would have to weld some high temp tube to the turbine scroll and that might cause cracks and whatnot.
Cheers! /Anders
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Post by pitciblackscotland on Dec 11, 2013 1:38:17 GMT -5
Hi Anders, Yes that would be a problem welding the tube on the turbine scroll or you could drill and tap a threaded hole and use compression fitting?? The two GTC20 turbines i have built by Garrett are aiming the impingement air on the compressor inducer i think, have a look on this photo. I'll need to check that out and get back to you on that one. Cheers, Mark..
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Post by stoffe64 on Dec 11, 2013 12:32:14 GMT -5
Hi Anders Yep, you need a positive ignition . Chris' suggestion of the brake master cylinder for a hot streak is a good one , multiple shots if required. Cheers John Hello John and Chris and everyone else! This brake master cylinder thing you were referring to is perfect as a hot streak starter BUT i do believe that the seals in such Thing dont work together with jet fuel or diesel,i think they will start to swollow and get stucked in the bore! I might be wrong too,perhaps someone tested it already? Cheers stephan
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Post by racket on Dec 11, 2013 16:12:38 GMT -5
Hi Stephan
We don't need to use kero or diesel in the hot streak , we probably want a slower burning fluid ( oil ?? ) that will still be producing "flames" by the time it reaches the afterburner fuel .
I'd imagine there'd be different seal materials available if a problem was encountered , same as with the Surflo pumps when they're made to pump fuel rather than water .
Cheers John
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Post by stoffe64 on Dec 11, 2013 17:59:46 GMT -5
Hello john It would be the same with oil,the seals will start to swallow,best fluid i think would be plain old brake fluid,if burnable that is! Cheers stephan
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Post by pitciblackscotland on Dec 13, 2013 0:49:05 GMT -5
Hi Anders, Ok the impingement air is aiming at the comp wheel exducer. Cheers, Mark. :-)
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Post by Johansson on Dec 13, 2013 17:05:45 GMT -5
Hi Mark, Looks like a very steep angle, I´ll try to make something similar in a spare comp housing and see how it spools up under full oil pressure. There is a huge difference in torque needed to turn the shaft between the jet kick S500 and my turbine bike TV94, with warm oil a flick of the fingers spins the shaft several turns on the S500 while the tiniest amount of oil pressure on the TV94 acts like an hydraulic clamp on the thrust bearing... =( Thanks for the pics! Cheers! /Anders
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Post by pitciblackscotland on Dec 13, 2013 18:47:46 GMT -5
Hi Anders, No worries, Yeah very steep angle jus like the air impingement set up on the JFS. The JFS was the same like an hydraulic clamp on the ball bearings that's with the accessory unit off but that's just how they are built i was told the ball bearings are identical to the large frame cat turbochager, i did have a photo of the bearing carn't find the bloody thing. Here is a link to the testing of the air impingement on the JFS youtu.be/XQg0WOijLn8 Cheers, Mark.
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Post by turbochris on Dec 14, 2013 11:42:59 GMT -5
I think I would completely enjoy holding the controls on that rig, and having a pedal to stomp real hard to bang the burner! I'll be like a fucking base player on drugs! bang bang bang bang bang bang I'll break my foot.
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jetdriver
New Member
Joined: December 2013
Posts: 3
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Post by jetdriver on Dec 15, 2013 9:51:41 GMT -5
Look into Magura motorcycle clutch master cylinders. They come on KTM and Husaberg. The Magura uses mineral oil as a medium, the Brembo units use brake fluid. They are also used on mountain bike brakes.
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Post by Johansson on Dec 17, 2013 3:32:32 GMT -5
Hi Anders, No worries, Yeah very steep angle jus like the air impingement set up on the JFS. The JFS was the same like an hydraulic clamp on the ball bearings that's with the accessory unit off but that's just how they are built i was told the ball bearings are identical to the large frame cat turbochager, i did have a photo of the bearing carn't find the bloody thing. Here is a link to the testing of the air impingement on the JFS youtu.be/XQg0WOijLn8 Cheers, Mark. Hi Mark, I´ve looked on the comp housings and it shouldn´t be overly difficult to fit an air jet to them, should make starting a pleasure compared to the leaf blower starting. I think I would completely enjoy holding the controls on that rig, and having a pedal to stomp real hard to bang the burner! I'll be like a fucking base player on drugs! bang bang bang bang bang bang I'll break my foot. We will try spark ignition first since we have all parts for it, it would be damn fun to have the instant ignition some engines have. Bang bang bang! =) Look into Magura motorcycle clutch master cylinders. They come on KTM and Husaberg. The Magura uses mineral oil as a medium, the Brembo units use brake fluid. They are also used on mountain bike brakes. Good advice, thanks! We started making the afterburner mounts a couple of nights ago, it will have two upper and two lower supporting rods that can be adjusted to put the weight off the connecting tube for the turbos. Here is the cradle finished, next up is to fit the supporting rods. Cheers! /Anders
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Post by racket on Dec 18, 2013 3:11:21 GMT -5
Hi Anders
Heavy duty construction, nice :-)
Is the cradle going to be a slide through arrangement for the AB?
If slide through you'll probably need at least 7 mm diametric clearance when cold , ..........200mm dia X 1500 deg C X 0.000022 = 6.6mm
Cheers John
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