A/R

[rickw]

My compressor housing is stamped A/R.55 Is that ok? I get about 7lbs. of boost. My engine runs good but hot.

[racket]

Don't be concerned about comp housing A/Rs , they are matched to the wheel .................its the turbine stage connected at the other end of the shaft that dictates things .

When you say "hot" .............what temperature ??

Do you have a jetnozzle installed ??

Cheers
John

[rickw]

Yes I have a jet nozzle with the outlet the same diameter as the inducer inlet. My thermal couple broke so no idea. Should the turbine housing be glowing red?

[wannabebuilderuk]

No, that's too much of a restriction and causing damage it shouldn't glow that much.

You should NOT run the engine without some way to measure the exhaust temperature or you risk destruction

[rickw]

Yeah I know. Ill have to get that sorted.

thx

[rickw]

How big should the outlet of the jet tube be?

[wannabebuilderuk]

There is no real way of calculating it (I'm sure john will be along soon to correct me) but I believe you just start with a straight pipe and slowly restrict it till the temperature doesn't get hotter than 750°c at full throttle for safety reasons. The smaller the restriction the greater the back pressure and higher the temperature

[racket]

Hi

Is it a dull dark red or a bright pink colour ??

A jet nozzle the same diameter as your comp wheel's inducer shouldn't be a problem , what sizes are your wheels ?

Cheers
John

[rickw]

The housing is a dull red and the turbine is red/orange. The compressor is 2.35 INCHES at the minor diameter and 3.4 INCHES at the major diameter. my fuel nozzle should be in the middle of the primary hole pattern?

[racket]

What size is your turbine wheel ??

What is the turbine scroll A/R ??

[rickw]

That I don't know

[rickw]

Turbine is 3.4 inches dia.

[racket]

inducer or exducer ??

[rickw]

turbine so exducer?

this a basic combustor configuration

[rickw]

turbine outlet diameter is 3.4 inches