rickw
Junior Member
Joined: November 2018
Posts: 73
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Post by rickw on Dec 12, 2018 19:03:30 GMT -5
How do you determine the diameter of the outlet nozzle?
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Post by racket on Dec 12, 2018 19:46:50 GMT -5
Hi Rick
It can be "calculated" using a lot of assumptions , but thats not the safest way unless you have a lot of very reliable data to go by , you'd need both a comp and turb map for your turbo.
The jet nozzle size needs to be just small enough for your temperatures to reach their design maximum at full power setting , ALWAYS better to start with an oversized jetnozzle , run the engine , then depending on the temperatures you're seeing , adjust the nozzle size down .
A jetnozzle the same diameter as your compressor wheel inducer shouldn't cause problems as quite often thats the size an afterburner on the engine will require.
Cheers
John
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rickw
Junior Member
Joined: November 2018
Posts: 73
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Post by rickw on Dec 13, 2018 1:26:38 GMT -5
I reduced my outlet diameter on the nozzle from 76mm to 63mm with a 59 mm inducer. No EGT issues and much more of an assault on the ears. More thrust it seems too. Win win.
Thanks John again.
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Post by racket on Dec 13, 2018 3:04:11 GMT -5
Hi Rick
You mightbe able go down a few more millimeters as long as your jetpipe temps are still OK , more temp = more power
Cheers
Jhn
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