|
|
Post by sebsracing86 on Apr 14, 2021 17:40:18 GMT -5
One other thing , your 63mm flametube is a tad "skinny" , you may get away with it using very combustable propane , if using liquid fuels like kero its advisable to have 3 times inducer are for the flametube cross sectional area , 40 mm inducer =1256 sq mms X 3 = 3770 sq mms = 69.3 mm diameter flametube ID . Hi John, thanks for your reply. I did think about this when doing the fabrication. So I designed the combustion chamber in such a way that if I wanted to change to another flame tube diameter I would be able to. I had a bit more success yesterday. Located the injector so a hole was better positioned near to the spark. Also tweeked the start up procedure, fettling the air in gradually, trying to initiate the burn. It worked!!! and ran quite well too. But I didn't try to throttle it much whilst it was running. Next test I will. Here is a clip of it running. youtu.be/jtA_7YEfHUU |
|
|
|
Post by racket on Apr 14, 2021 19:28:09 GMT -5
Hi Sebastian
Congratulations on getting the engine running :-)
Do you have a P2 pressure gauge on the engine ??
You'll need one if you wish to explore higher power setting so that you don't overspeed the turbine wheel .
Once the propane has ignited its possible to seal the blower against the turbo inlet and push the spoolup along as quickly as possible , less chance of an overtemperature happening .
Cheers
John
|
|
|
|
Post by sebsracing86 on Apr 15, 2021 16:14:31 GMT -5
Thank you.
I have installed a turbo boost pressure gauge today. I did a test run and it was working fine.
Opened the gas up a bit more and I was seeing pressure readings of 5-10psi.
Also I noticed that when trying to adjust my oil pressure the resistance was slowing the rpm down. It was quite hard to try and set a pressure as I am just using a gate valve designed for water. I may try to use something different, a needle valve of some sort maybe?
I have also ordered a EGT thermocouple and gauge to install too. I was planning to tap this into the exhaust.
|
|
|
|
Post by racket on Apr 15, 2021 16:59:46 GMT -5
Yep , a needle valve will be much better for control of the lube flow, but remember , lube isn't just there for lubrication , it also stabilises the rotor as well as keep it cool , so please try to run the engine with the "normal" oil pressure that the turbo would have experienced on its IC engine .
|
|
notjet
Junior Member
switzerland sure doesnt like selling large piping in my area ._.
Joined: October 2022
Posts: 54
|
Post by notjet on Oct 24, 2022 14:33:58 GMT -5
Hi, im quite new here but have learned quite alot reading various builds n stuff. Id like to know how this turbojet is running so well since it has a very small exducer compared to comp.
Am i missing something here or is it just another version with bigger exducer. Id like to build a small freepower and a 40mm inducer turbo should be around perfect for the power im looking for.
Cheers, Neo
|
|
