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Post by slittlewing on Oct 15, 2018 14:30:17 GMT -5
Managed to get the carbon skin off after a half hour battle, maybe should have done a couple more waxes š  Will trim tomorrow around the silver line and then need to decide whether to bond it to the tank using structural epoxy or two part silicone.  |
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Post by Johansson on Oct 15, 2018 14:53:42 GMT -5
Nice!
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Post by azwood on Oct 15, 2018 20:30:23 GMT -5
Nice job have you measured thrust yet I'm waiting on a digtital scale to test my kart I wanted to do a bike but it wouldent fit the frame.good job getting it to fit.
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on Oct 16, 2018 1:11:33 GMT -5
Nice work, :-)
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Post by slittlewing on Oct 16, 2018 8:57:45 GMT -5
Cheers guys, I trimmed it up at lunch today and its looking better. Will bond it to the tank tomorrow! It will be covered in insulation so no-one will ever see it, but if it stops the tank melting its good enough for me haha. Nice job have you measured thrust yet I'm waiting on a digtital scale to test my kart I wanted to do a bike but it wouldent fit the frame.good job getting it to fit. Not yet, because I would need to make stabilisers for the bike to stop it falling over  but once its fully "mobile" and rolling, maybe I can hold one handlebar lightly and try to measure! Part of me wishes I had done a bigger turbo like HX82, but theres no chance a bigger one would have fit in this tiny 125cc frame. Packaging the pumps, cooler and battery is going to be "interesting" hahaha |
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Post by azwood on Oct 16, 2018 16:24:24 GMT -5
Cheers guys, I trimmed it up at lunch today and its looking better. Will bond it to the tank tomorrow! It will be covered in insulation so no-one will ever see it, but if it stops the tank melting its good enough for me haha. Nice job have you measured thrust yet I'm waiting on a digtital scale to test my kart I wanted to do a bike but it wouldent fit the frame.good job getting it to fit. Not yet, because I would need to make stabilisers for the bike to stop it falling over but once its fully "mobile" and rolling, maybe I can hold one handlebar lightly and try to measure! Part of me wishes I had done a bigger turbo like HX82, but theres no chance a bigger one would have fit in this tiny 125cc frame. Packaging the pumps, cooler and battery is going to be "interesting" hahaha Yeah its not an easy task fitting everything in a bike.hope it works out for you I'm keen to see how she goes. |
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Post by slittlewing on Oct 18, 2018 2:51:34 GMT -5
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Post by racket on Oct 18, 2018 3:17:50 GMT -5
Hi Scott
I did a test with one on my Tv84 engine back in 1999 , the turbo shop asked me to give it a try , it certainly cut down radiant heat , but did create problems on shutdown as it took longer for the scroll to cool allowing more heat soakback into the shaft/bearings.
The stitching on the cover I tested was made of cloth bound wire , and on first heat cycle there were some "flames" as various bits of the cover burnt , but overall it maintained integrity.
I did find the cover shrunk after a few heat cycles at up to 700 C TOT , and felt it needed to be fitted loosely to begin with .
Hopefully in the intervening 20 years they've improved the materials , it should help your needs , but beware of the heat soakback problems
Cheers
John
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Post by azwood on Oct 18, 2018 5:21:30 GMT -5
Hi Scott I did a test with one on my Tv84 engine back in 1999 , the turbo shop asked me to give it a try , it certainly cut down radiant heat , but did create problems on shutdown as it took longer for the scroll to cool allowing more heat soakback into the shaft/bearings. The stitching on the cover I tested was made of cloth bound wire , and on first heat cycle there were some "flames" as various bits of the cover burnt , but overall it maintained integrity. I did find the cover shrunk after a few heat cycles at up to 700 C TOT , and felt it needed to be fitted loosely to begin with . Hopefully in the intervening 20 years they've improved the materials , it should help your needs , but beware of the heat soakback problems Cheers John Yep I used one on a car I built it was silver heat stuff it worked great you could touch it after a hard run but it was hot still some other ones I made a stainless shield with two layers and the middle packed with heat cloth that might work and still let airflow to the housing. |
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miuge
Veteran Member
Joined: March 2014
Posts: 200 
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Post by miuge on Oct 18, 2018 15:41:50 GMT -5
You shouldn't have glued the carbon bottom of the tank, better to have an air gap between so the heat doesn't directly transfer on it. Put some reflective gold heat shield over the carbon and it will be good.
If you're going to use a turbo blanket make sure it's got good reviews, the very cheapest ones have even caught on fire!!
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Post by slittlewing on Oct 19, 2018 5:37:23 GMT -5
You shouldn't have glued the carbon bottom of the tank, better to have an air gap between so the heat doesn't directly transfer on it. Put some reflective gold heat shield over the carbon and it will be good. If you're going to use a turbo blanket make sure it's got good reviews, the very cheapest ones have even caught on fire!! Well the carbon skin is not really intended to be the main heatshield, but more of a solid base for the tank to prevent it melting. I am intending on placing a metal heatshield above the turbine, with gold foil facing turbine and insulation on fuel tank side (or otherwise turbo jacket instead). The above carbon baseplate will also have insulation attached! |
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Post by slittlewing on Nov 7, 2018 17:23:49 GMT -5
So its been a while since my last update, I have been cutting lots of cardboard and making templates for laser cutting. I am hoping to do one huge order with almost everything needed to finish the bike (bracketry, heatshields etc). On the heatshields I am not sure whether to make from 1mm Stainless (thats my inclination), or thicker Aluminium (e.g. 1.6mm). Any recommendations? There is a section where the ali would be very close to the tailpipe but I would have thought it wouldn't melt purely from the radiant heat. One advantage of using stainless is that I can weld them to the subframe, but I am also wondering if I should make them removable/bolted, incase my Insulation plan A doesnt work and also so that I can paint the subframe and not the heatshields? Still undecided on bolt on/weld... This is the approximate plan, in cardboard:     Plan A is to gold foil the heatshields facing the turbo/tailpipe, and insulate the back with stick on "insulative foam". Plan B would be to use a ceramic wool (rated for higher temp) but that isn't easy to attach and needs "encapsulating" somehow. i.e. double skinned, which is more complexity and weight. I also bought a 13 row oil cooler off ebay, and a filter and housing. The oil cooler is a real tight fit in the available space. I was hoping to build a cowling behind it, and use a pair of 120mm fans to get a good pull through it but there isnt any room. So I am going to have to put the fans in front of it, in a "push" configuration. There also isn't any space for a cowling in front of the cooler (I think the mudguard will hit), so I will be forced to use a pair of 92mm fans up against the cooler which isnt ideal as there will be lots of wasted core. I am guessing it should be enough though, as the size is generous? Placement of items should be something like so:      I got a load of free 7Ah Yuasa Lead acid batteries, I have designed a box to hold 3 of them, giving me approx 20Ah. With Two Fuel Pumps @ 10A each, Oil Pump 10A, Oil Cooler Fans 10A, That should give me 30 mins runtime which is enough for several tanks.  Look forward to any advice on the above heatshield decisions!! Cheers, Scott |
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Post by Johansson on Nov 7, 2018 17:27:55 GMT -5
IĀ“d go for stainless and leave an air gap between the shield and afterburner, we tried to insulate the AB on the second jet kick sled and that didnĀ“t turn out well because the AB wall overheated and burned a hole.
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on Nov 7, 2018 19:27:45 GMT -5
Hi Scott
Looking good :-)
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Post by slittlewing on Nov 11, 2018 15:34:43 GMT -5
Nice one, I think I will go for stainless 1mm thickness. I have been doing lots of āiterationsā on the laser cut designs, plotting them in 1:1 scale on paper, cutting out and checking on the bike to try and make sure everything fits perfectly first time!
One question... with a single tank feeding two pumps, do you think I can get away with just a pre filter? I.e. filter straight after the tank, then split the line to both pumps?
If I have to put a filter after each pump aswell itās going to be tricky to fit in (also seems overkill having 3 filters)
Cheers
Scott
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but once its fully "mobile" and rolling, maybe I can hold one handlebar lightly and try to measure! 
