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Post by smithy1 on May 16, 2016 17:17:38 GMT -5
An indicated 620ft-lbs at stall ....damn...shes gunna light the tyres up for sure...! Cheers, Smithy.
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Post by racket on May 16, 2016 18:53:49 GMT -5
Hi Smithy
And thats at only 25 psi P2 , at 40 psi P2 the theory says close to 1,000 ft lbs at the rear wheel , which if the wheel is 2 feet in dia will give a 1,000 lbs of "thrust" .
Now Andy has a clutch and some fairly heavy rotating assembly in the freepower wheel and gears which will further increase the potential for off the mark acceleration, yep ,it'll move :-)
Cheers John
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Post by smithy1 on May 16, 2016 21:20:10 GMT -5
1000ft-lbs of torque...!! That's getting near fairly big diesel truck engine numbers....I hope the chain and axle can handle those numbers... My 2.4L "remapped" turbo diesel Transit only has 340ft-lbs and it weighs two tonnes..! Andy, I hope you have plenty of spare undies..! There's gunna be plenty of skid marks.. Cheers, Smithy.
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Post by racket on May 16, 2016 22:51:07 GMT -5
Hi Smithy
LOL , yeh , but that big truck diesel then has a gearbox to multiply the torque even further , it probably ends up with 10,000 ft lbs at the wheels in first gear.
Your road bike probably has 1,000 ft lbs at the back wheel in first gear .
The good old Allison C20 has ~70 ft lbs at the freepower rotor , ~365 ft lbs exiting the gearbox at its ~6,000 rpm 100% N2, but that'd be up around 750 ft lbs if the freepowers were stalled , add on say a 2.5:1 redux to get rpm down to prop/backwheel of a bike rpm and and there'd be ~1875 ft lbs of torque available if stalled , yep , the numbers get kinda big when the freepower is stalled and the gas producer is at 100% :-)
Your 6041 would be capable of even more torque than the TV94 based engines .............LOL, can we tempt you ;-)
Cheers John
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Post by smithy1 on May 17, 2016 1:02:04 GMT -5
Hi Smithy Your 6041 would be capable of even more torque than the TV94 based engines .............LOL, can we tempt you ;-) Cheers John Certainly...but I really like the sound of an afterburner ....and to be honest, there's nowhere to really let it wind up which is local to me..which is a bit of a bugger..!
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Post by racket on May 17, 2016 1:23:47 GMT -5
Heh heh , perhaps you need to make a freepowered bike so you can run it at Eastern Creek ;-)
Maybe with only partial pressure drop across the freepower so theres plenty of pressure left for an afterburning exhaust............best of both worlds .
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Post by Deleted on May 17, 2016 1:37:59 GMT -5
Hi Guys
Yep the numbers look good, with the little amount of throttle i had dialed in on the video i was soon running out of space. Need to find some space to stretch her legs, and get my feet up :-) Things need to start feeling like second nature, getting off the line and dialing in the throttle as quickly as possible
So i hope soon to be getting to the track, with spare undies packed :-)
Here is video from first test we did that day.... pulled off at 6psi (idle) in this one, the second one was 8psi going towards 10psi,
All The Best Andy
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Post by Deleted on Jul 6, 2016 16:52:11 GMT -5
Hi Guys
Well some of you may know, i been having some issues with the bikes starter, but glad to say all sorted now. I have a show in a few weeks, and the bike and the kart are on the program.
Am hoping to get up to at least 3 figures on the bike and the kart, here is a quick video of last kart test
All Best Andy
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Post by racket on Jul 6, 2016 20:56:17 GMT -5
Hi Andy
You're making that beast scream :-)
Looking forward to hearing how it goes
Cheers John
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Post by Deleted on Aug 22, 2016 1:55:55 GMT -5
Hi Guys As some of you already know i was at an event last weekend called Mini In The park, held at Santa Pod Raceway. The Bike was there as was the kart I would like to say thing all went to plan...... think the video's best tell the story Every thing on the bike checks out, just kind of think it was a few little things happening at the same time, that could of led to the flames. Time and testing will tell As for the kart afterburner going out, erm ? at the moment its pointing towards it just going to lean, i think i have a fix and once the bike is pulled apart ready for some little improvements. i will test to see if my idea works All The Best Andy
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Post by racket on Aug 22, 2016 20:21:07 GMT -5
Hi Andy
The kart still did an acceptable terminal speed despite the A/B problems , she gets off the line rather well :-)
Cheers John
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Post by Deleted on Aug 27, 2016 6:57:19 GMT -5
Hi Guys Yes John the kart is getting off the line real nice now, just wished we had bothered to get timing sheet, could of at least looked at the 60ft times, mite of given an idea as to what we mite of done So to the bike ...... I am glad . well not glad, but happier i have found the problem it would seem that a few of the evaporator tubes have broken, this could be down to a few things bad starts, vibrations in the engine, or even when the bikes being transported. Never the less i think that they have lasted this long is credit to how well the engine was built by John. i no even commercial engines have the same issue, As you can see from the photos every thing else looks wonderful, and now i have these on the way from John, I am getting all the little improvements done, improve control system for the clutch, sort out the little issue of smoke at start up, and i hope to be up and running again soon Thank You John For These All The Best Andy
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Post by racket on Aug 27, 2016 16:24:36 GMT -5
Hi Andy
Thanks for posting the pics :-)
Yep , hopefully the modified evaps won't suffer the same fate as the originals , the sharp edged bottom of the recess in the tube undoubtedly contributed to the potential for breakage if subject to some sort of vibration, the "new" rounded recess bottom shouldn't have the same problem .............we live and learn , maybe its reason why plain tubes are generally used even though they don't have quiet as good an evaporative potential , but with our very short flametubes I opted for the D'ing just to be on the safe side.
The fact that the two broken tubes are on opposite sides of the flametube with their fracture lines in rough alignment sorta points to a certain type of vibration , maybe from using the ball bearings rather than the bushes with their oil that smooths out turbo rotor vibrations modes , the types of vibrations that can't be eliminated from just balancing the rotor.
Cheers John
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Post by Deleted on Sept 9, 2016 12:59:41 GMT -5
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Post by racket on Sept 9, 2016 16:32:22 GMT -5
Hi Andy
You've been busy :-)
Looking like new .
Cheers John
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