Post by rocketman_mike on Jun 18, 2023 21:00:18 GMT -5
if the weather cooperates here, Im going to disassemble the CC and get some gaskets made to seal up the leaks I found. I have some concerns with the EGT gauge that went dead today, hopefully it's just a bad ground. Also going to begin figuring out a fail safe for oil system. I noticed some of you are using oil pressure switch as a means of killing the fuel pump if you lose pressure. I actually really like that and would like to incorporate that into my system. My oil pressure gauge was on the fritz this morning. I wasn't reading any pressure, but eventually freed up, possibly passed an air bubble through the system or maybe the gauge itself was stuck, needless to say, I want that looked into.
Yep , oilpressure interlock with the fuel pump is a must have item , Hobbs switch and a relay , its very easy to have an oil pressure problem that goes unnoticed in the heat of the moment , its cheap insurance .
Post by rocketman_mike on Jul 7, 2023 18:41:05 GMT -5
Rocketman Maddox has fabricated an exhaust nozzle for me and will be shipping it soon. I cant wait to get it welded on. I asked him to make the exit a little smaller so I can test it and trim it back as I need. Afterburner is almost done. Once I have the nozzle welded on, all I need is a threaded bung for a spark plug welded on, so I'll have them both done at the same time.
I haven't done too much since I got it started on father's day. I've been busy with dating and learning how to be human again. I took the kart to another car show at the local warbird museum and everyone loved it even though I didn't start it (safety reasons being in mind). I'd like to keep experimenting with it and feel it out before trying to start it near a crowd.
I was challenged to a race against Adam's pulsejet-powered sled. He's back in Canada this week getting it packed up to bring back here to Florida. He's also bringing some extra fuel pumps and bits from a past turbine build. Im excited to see this thing when he gets back. I tried building a pulsejet when I was maybe 14 or 15, but I made it too small and had issues getting it to self sustain because my reeds were too thick and the only way it would run was by forcing air into the intake. Adam built his engine with Maddox's plans, so Im very curious how this witchcraft works. I thought he said it pumps out about 100 lbs of thrust.
Post by rocketman_mike on Jul 21, 2023 19:39:11 GMT -5
making some progress on the afterburner nozzle. It's just about ready to be welded together and the nozzle trimmed back a bit. It's just been too hot to do anything outside and I've been about as distracted as a crackhead 6th grader in a toy store. I managed to remove the AB fuel pump from it's original location and going to relocate it somewhere a little easier to access and not so close to the ignition system. I revisited the brakes again and did some more brake bleeding. I think I still have an air bubble stuck in the system, so we'll come back to that. I've been diving down the Arduino and Raspberry Pi rabbit hole the last couple days. I would like to eventually have a Pi dash display and an Arduino Uno and DC motor shield to control/monitor the engine. Im just not quite up to speed on the electro-digical bleep bloops. Unlike my millennial peers, who were learning how to program computers in high school, I was tucked away in a blacksmith shop on the edge of a cornfield in Maryland, learning how to forge knives and swords from car springs. HAHAHA. I guess some of us are just cut from a different cloth.
Anyway, Not sure when I'll fire it up again. I'd like to have Adam with me again for an extra experienced set of eyes, but he's run back to Canada for another week to pick up some more things. But, when we do fire it up, we'll crank up the pressure on the diesel and see if we can get an idle on liquid fuel. We had a decent idle on propane despite having some pressure leaks around the combustion chamber. I also want to keep a closer eye on the oil temperature. We had solid 40 psi the entire couple of minutes it ran, but I don't recall seeing anything for oil temperature. Between the adrenaline rush of hearing this fire up for the first time and being distracted by a concerning lack of readings on my TIT gauge, I didn't hit the record button or I hit the back button when I put the phone back in my pocket and it didn't save the video. Tested the TIT and TOT gauges post run and they both seem to be working fine. I replaced the nylon line for the P2 gauge after I noticed it was snapped from being so old and brittle. I've also had some issues with the oil pressure gauge getting stuck, but frees up after a little tickle from the backside of an adjustable wrench. I have another pressure gauge ready to be installed whenever it's not a billion degrees outside.
I do have a question for the experienced folks here, could I get away with fabricating the outer liner of the combustion chamber with aluminum, since it's just air from the compressor and have the flame tube fabricated from stainless? I hate to use dissimilar metals especially in this corrosive Florida environment, but just trying to look for ways to save some weight.
Post by rocketman_mike on Aug 17, 2023 17:52:23 GMT -5
decided to replace all the braided hoses with hardlines, relocate the oil tank and pumps and started fabricating a new, larger oil tank. Fuel lines have been made and oil lines should be done this weekend. Just trying to clean up what has become a disorganized, leaky disaster waiting to happen. This all should help make maintenance a lot easier. Also taking advantage of this time to add in a pressure switch for the oil system, relocate my oil pressure control valve and the throttle valve. Got the afterburner finished. I saw what happened to Scott's afterburner, so Im wondering if mine will hold up to the torture.
Post by rocketman_mike on Nov 5, 2023 19:19:24 GMT -5
Really haven't messed with the kart in probably a couple months now. Been busy with traveling back to my hometown and seeing my brother graduate from infantry school before heading to airborne school. I did, however, polish her up for a car show at work and I also took it with me to some jet dragster race last night. I will probably be refilling my air tank tomorrow after work and I need to recharge the battery and I will try to fire it up again this coming weekend. Meanwhile, I'm nipping on the heels of a 106mm turbocharger, so if I land this purchase, I will begin sourcing materials to build a new combustion chamber and begin looking around for another go kart frame. Here's some photos of the kart receiving some attention from Virginia highway patrol, the car show and some shots from last night's jet dragster show. Even got a photo with Elaine Larson.
Post by rocketman_mike on Nov 20, 2023 19:27:28 GMT -5
Had a very successful full power run and to my amazement, the afterburner worked beautifully. I honestly had some doubt if it would work. I was also able to successfully transition from propane to diesel without any difficulty. On a side note, the boost gauge wasn't working, so Im unable to calculate any performance numbers as of this time and one of my EGT gauges decided not to play, which made me understandably nervous flying blind. Oil pressure seemed to stay around 40-45 psi the whole time, so that was a little reassuring. Most of the smoke in the video is from the turbine housing punishing the cheap thermal blanket. I have some welding to do on the oil tank and add a fitting for oil temp sensor. Going to get that oil pressure/ fuel pump kill switch wired up. www.youtube.com/watch?v=pn4k-LLZAn0