miuge
Veteran Member
Joined: March 2014
Posts: 199
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Post by miuge on Jul 29, 2021 15:39:41 GMT -5
The two aluminum and stainless won't weld together unless we're talking about some highly advanced laser welding or such, all you did was a mechanical bond. For your own safety, don't use that method for anything that should hold up pressure or flammable fluids.
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ausjet
Veteran Member
Joined: May 2013
Posts: 133
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Post by ausjet on Jul 30, 2021 10:01:41 GMT -5
I looked into using an off the shelf automotive ecu like a haltek elite 1500 as they have a fair amount of software flexibility but ran into the problem of controlling the pumps as the ecu can’t supply anything over 1 amp. You might be able to connect some of the outputs to a pwm controller(s) to drive your oil/fuel pumps? Aftermarket ecus are quite expensive- A cheaper alternative that might be worth a look is pre-made or kit form ecu called “speeduino”. They’re 1/4 the price of traditional aftermarket ecus, have all if not more functionality and could be built and configured to output whatever amperage you need for the pumps as it’s arduino based.
For your oil tanks your better off not rushing it. It’s way easier redoing/remaking/modifying things now rather than later when everything’s built around it, full of oil etc. No one wants to see the inside of a burns ward at their local hospital when something goes pear shaped. I’ve found fire extinguishers to be pretty versatile. They can make good tanks, flame tubes, combustion chambers etc
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Post by turbojet atv on Jul 30, 2021 11:56:21 GMT -5
Hi ausjet.
The ecu I was wanting to use was a FuelTech FT450. It’s pretty versatile and has plenty of outputs & inputs for my to wire everything I would need. It might be one of the cheapest aftermarket ecus (not quite sure exactly) but I will look into what you mentioned. A diy ecu kit might be something I’ll do.
The only big thing that would be drawing amps would be the fuel pump. I’m making my own oil pump with a 12v rc motor. Or maybe just a 12v motor. I got to look at options for that.
The oil tank I’ll look over more and redo the fill cap. I’ll look for someone who can make me a SS bung that still allows me to use the fill caps I’ve got already. I’ll cut off the aluminum bung and reweld the ss one in its place.
-Cullen
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Post by turbojet atv on Aug 5, 2021 3:07:27 GMT -5
Hi guys,
I’ve got one engine almost finished; just finalizing small bits for final assembly. I’m about to start order all my fuel parts and want to know what size capacity fuel tanks y’all used. I want to get a 2 or 3 gallon tank to fit under the bikes fender but would 2 or 3 gallons support the engines for a few minutes?
Going down a 1/4 or 1/8 mile track; depending on where I race, I might only need 5 minutes max of run time truly.
-Cullen
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Post by racket on Aug 5, 2021 4:08:55 GMT -5
Hi Cullen
In an earlier email I gave a max flow ~20 GPH , so a gallon in 3 minutes , so a coupla gallon tank should be adequate
Cheers John
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Post by turbojet atv on Aug 11, 2021 1:26:31 GMT -5
Hi guys,
Do y’all know any place that have Delavan variflow nozzles available? Every where I’ve look they’ve had them out of stock or didn’t have the nozzle I needed. One place only have a 3gph nozzle which isn’t big enough for my engines. Or I can sub out the variflow for a similar nozzle.
Any help?
Thanks, Cullen.
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Post by racket on Aug 11, 2021 2:30:32 GMT -5
Hi Cullen
You can use a different nozzle type but your low flow rate atomisation will suffer , the Variflo allows lower fuel pressures with good atomisation at idle.
A 20 gph flow through a 20gph nozzle will need a fuel pressure of 140 psi at 40 psi P2 to provide the "rated" fuel pressure drop of 100 psi .
My thoughts would be to run higher fuel pressures and a normal nozzle to provide adequate idling atomisation .
Cheers John
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Post by turbojet atv on Aug 11, 2021 3:39:53 GMT -5
Hey John,
I just found a place that has a 20gph variflow. It’s got an 65° spray pattern. I just emailed them to see if they have it in stock. A 65° pattern should have a good atomization and pattern.
-Cullen
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Post by racket on Aug 11, 2021 4:01:54 GMT -5
Hi Cullen
65 degree will be OK :-)
Cheers John
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Post by turbojet atv on Aug 21, 2021 17:38:07 GMT -5
Variflow nozzles aren’t looking so easy to find at this point in time. Every place has it on back order until further notice. I’m looking for other fuel injector options at this point in time to keep pushing this project along.
I can use a different Delavan nozzle and just run different fuel pressures or one other thing I found was nitrous dry nozzles. Nitrous nozzles spray high pressure gases or a liquid mix so what could it hurt? There’s fogger nozzles that spray 180° straight instead of the 45° versions. A different Delavan nozzle could easily work as well, just the high fuel pressure would probably call for a different fuel delivery methods.
Opinions? Options?
Thanks, Cullen. 🙏
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Post by racket on Aug 21, 2021 17:47:04 GMT -5
Hi Cullen
When I starting building my TV84 bike 30 years ago the availability of spray nozzles was extremely limited , I ended up using less than ideal spray shapes and angles , but the engine still worked even with 30 degree spray angles and never more than 60 degree ones .
If you can find a hollow cone variety with 60 degree angle , use it and make the fuel system required, don't play around with anything other than oilburner nozzles
Cheers John
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Post by turbojet atv on Aug 22, 2021 1:38:25 GMT -5
Hey John,
Best thing I can find in stock ready to ship is a 3 gph. It seems anything bigger is on a back order until further notice. This COVID stuff got this all messed up.
-Cullen
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Post by pitciblackscotland on Aug 22, 2021 2:18:09 GMT -5
Hi Cullen, I have a box of nozzles i can sell a nozzle to you. Have a look and see if there is a nozzle you can use. I can machine up the boss out of some round stock and drill and tap a hole to screw the nozzle into if you need that as well. I have a boss i machine up somewhere. I'll post a photo when i find it. Cheers, Mark.
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Post by turbojet atv on Aug 22, 2021 4:30:14 GMT -5
Thank you very much Mark!
Those 7.5 gph injectors are the biggest you have? I’ve been looking around for a 20ish injector..or multiple injectors. How many 7.5s do you have? I might be able to use 3 per engine to meet my “goal”. I’d honestly need 6 if that’s the case.
Thanks, Cullen
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Post by wannabebuilderuk on Aug 22, 2021 4:50:37 GMT -5
There's this 20gph 60° hollow nozzle www.anglo-nordic.com/steinen-ss-oil-burner-nozzles.htmlThere's probably more options for things in the us but there's this. I remember seeing some high flow nozzles on ebay.us but can't remember the keywords I searched, might have been monarch or fluidics nozzles
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