New kid with some questions

[redc5]

Greetings all,,,I have wanted to build a turbine for a long time and finally have the time  to do it.
I traded for a Garrett Turbo from a Ford 6.0 engined truck. It is in good shape but has the variable vane feature. I plan to disable(lock) it in position.
First question,,how do you measure inducer size?? Is it the diameter of the hole at the intake of the turbine??
Is there a need to know the outside diameter of either turbine?? I do not want to open case if not necessary!
Any tips would be appreciated!!!
Cheers,
Julian

[BFTO]

You know what turbo you got? you should have a plate on the casings with model/serial/part number and so on.

[redc5]

It looks just like this one.
jetandturbineowners.proboards.com/thread/573/gt3788va-variable-nozzle-turbojet-build

There is no ID plate , just this sticker.
Garrett
P/N 1845178C98
S/N KJM054766
Thanks,
Julian

[racket]

Hi Julian

Good to see you made it across from the Yahoo Site :-)

Yep , lock the variable vanes in roughly a mid range position initially , once the engine is running and you've gained some experience then some experimentation can take place with changing its position a bit .

Cheers
John

[redc5]

OK next question....
Where should the air inlet tube from the compressor enter the combustor?? What size,and Angle of entry??
It looks like my inducer is measuring 2.35".
Thanks,
Julian

[racket]

Hi Julian

Use the same sized tubing as the comp housing outlet or a tad larger ID , don't go smaller ,I like a straight in approach , no tangential swirl , and have a diffusing "cone" if possible to spread the air flow and increase flow area around/past the flametube , position the delivery tube at the outlet end of the combustor so that the air has time to even itself out before reaching the primary zone.

jetandturbineowners.proboards.com/attachment/download/46

Cheers
John