greazy
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Post by greazy on Feb 26, 2018 18:52:49 GMT -5
i have drawn a mockup of where the walking sticks below outlets into the c/c are in the center of the five circles and the black pen are my options of where to start the vaporizers from. i feel like option 3 would be best leaving the start of the sticks in the hot middle where there is no real chance cool air can affect the vaporizers but it may be over crowded. any thoughts???
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greazy
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Posts: 128
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Post by greazy on Feb 26, 2018 7:14:43 GMT -5
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greazy
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Joined: December 2015
Posts: 128
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Post by greazy on Feb 25, 2018 17:19:59 GMT -5
i picked up my ss evap tubes on sat and decided to try a right radius bend instrad of miter cuts and welding back together for the walking sticks. i had many failed attempts i tried heating and bending. fail pack with sand and cap ends. fail (probably the best result) internal bending spring. fail afyer all this dissapointment i decided to make a tool up. i have a half inch mill bit the same size as the tube and milled perfect grooves in the blanks and also made a die for supporting rhe straight part of the stock. ill mount these all to a base today and see how it goes. if this fails i may make a bullet for the internal part like a mandrel bender but it may be too much work by that point so there is always the mitrr cut and weld option. ryan
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greazy
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Post by greazy on Feb 23, 2018 9:08:29 GMT -5
end cap from 3mm ss that a friend cut a few months back on his home built cnc plazma I cleaned it up a bit then tacked the lid and ring together and drilled out the holes to 10.5mm . i then welded 10mm stainless nuts behind the ring and also added 2 5mm rod locating pins. it may not seem necissary but the last engine i made i spent ages trying to line up the holes wich are never perfect in any other orientation. during the the test and tune phaze that plate came off about 40 times at least so this is well worth it for the hour or so work it took. i have aslo ordered some 12.7mm .9mm thick tube for the vaporizers 5 of should give me 11.5% or so of the inducer area and its nice and thin so thats a bonus. hopefully i have more to update shortly ryan
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greazy
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Post by greazy on Feb 20, 2018 16:35:59 GMT -5
ok ill have a play with 5 bent tubes and see how they fit. and ill also look for some thinner tubing in the meantime
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greazy
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Post by greazy on Feb 20, 2018 16:32:39 GMT -5
yes they will be walking sticks ( 180ยฐ bend outlet facing the start of the flametube ) i just drew up the fusion program to get my head around the penetrations.
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greazy
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Post by greazy on Feb 20, 2018 16:08:10 GMT -5
the other option is 5 sticks at 10mm id or will that be too crowded in the flametube
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greazy
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Post by greazy on Feb 20, 2018 16:06:37 GMT -5
ok the compressor is actually only 70.5 mm I'm not sure how to change the topic name. 70.5 = 3903mm2 10% 390mm2 รท 4 = 97.9 so 11/12 id is the go i may bore out some solid bar to make some thin walled tubing
dose the bellmouthing at the entry increase flow / speed of the evap sticks at all. thereby reducing the nessissary stick size?
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greazy
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Post by greazy on Feb 20, 2018 8:45:50 GMT -5
here is a half ass mockup of my fuel design the cone on the door will secure the flame tube and the evap sticks will be welded to it 4 individual fuel jets ( im thinking like Anders idea with the banjo bolts on his new jetbike motor) will be fixed to the door and aim down the evap tubes with room for air to enter with the fuel. i havnt seen any designs like this before but I see no reason it wont work. ill make the cone as shallow as possible but so it still allows air past for evap feed and cooling of the rear door. also room right in the center for spark or preheat jet. cloud.tapatalk.com/s/5a8c241cd457e/20180220_212915.mp4
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greazy
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Post by greazy on Feb 20, 2018 5:40:15 GMT -5
inlet and outlet are welded to the main chamber. I'll cut to a hight of 300mm long and fab a removable end cap shortly. @ racket- how big should the walking sticks be? length and diamiter! i have access to ss tubing 10mm Id with a wall thickness of 1.5mm is that too small an area for 4 sticks??
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greazy
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Post by greazy on Feb 16, 2018 20:23:17 GMT -5
ok 250mm it is. ill suss out a fuel method in the week and get back to you for your oppinion ๐
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greazy
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Post by greazy on Feb 16, 2018 17:52:57 GMT -5
Hi Ryan The length will depend to a great degree on how you are fueling the engine , and how well you want the Secondary and Tertiary Zones to work . The better the fuel/air presentation/mixing in the Primary Zone the shorter things can be made . Now , is your 200-250 mm including the "funnel" between the round section and the rectangular turb scroll inlet , or only the straight walled section ?? Cheers John 250mm of full 5" flame tube length. with the funnel it will take it to about 300mm in length. i haven't decided on a fuel delivery system yet i have a single spray nozzel setup into a trunk evaporatpr before. however ill gladly make a individual nedle and evaporator setup if that works better
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greazy
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Post by greazy on Feb 16, 2018 17:05:58 GMT -5
a question for the more experienced how short can I make the combustion chamber?
its 172mm id so 23235 mm2 flame tube is 125mm so 12271 mm2 comp intake is 70.5mm so 3903 mm2
i know the standard eazy to make numbers are 6x comp size but thats 420mm long and id really like to avoid going that big. i was thinking 200 to 250 long but im unsure if this will be too short for a decent burn. any advice appreciated
thanks ryan,
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greazy
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Post by greazy on Feb 16, 2018 2:42:18 GMT -5
shaped cut and prepped for welding ๐ I'll tackle that part tonight after a few beverages ryan
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greazy
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Post by greazy on Feb 11, 2018 2:17:40 GMT -5
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