I'm working on the new injector right now! I will run it tonight and see how it
goes. I will try out my new tach also. Thank you so much for your help!

Ken

--- In DIYGasTurbines@yahoogroups.com, "John WALLIS \(Racketmotorman\)"
<racketmotorman@...> wrote:
>
> Hi Ken
>
> Yep, she's running a bit hot at the outlet end of the flametube , ideally the
flametube wall should be hottest in the primary zone where the fuel is injected
, it should then start to run cooler from the secondary holes and show no
signs of overheating once past the main dilution holes in the tertiary zone ,
......................a change of propane injector to one with radial holes
will/should fix the problem :-)
>
> Propane is a fast burning fuel that copes with wide F/A ratios so an ideal
fuel to use.
>
> Cheers
> John
>
>
> ----- Original Message -----
> From: Ken Herbert
> To: DIYGasTurbines@yahoogroups.com
> Sent: Friday, January 27, 2012 11:34 AM
> Subject: [DIYGasTurbines] Re: Boost pressures and EGTs
>
>
>
> I just took the flame tube out and inpected it. It seams as if the flame is
traveling to far twards the turbine side. I think I will make another injector
like you said that sprays around insted of striaght in. I dont want to make too
many changes at once. I will just try one thing at a time!
>
> http://www.youtube.com/watch?v=NitQ9Y7StUU
>
> --- In DIYGasTurbines@yahoogroups.com, "John WALLIS \(Racketmotorman\)"
<racketmotorman@> wrote:
> >
> > Hi Ken
> >
> > 2.5"inducer gives us 4.9 sq inches , we need ~3 times inducer area for our
flametube crossection , so ~14.7 sq ins , or ~4.3 inch ID as a minimum diameter
, preferably 5 inches to make it simpler to get good combustion first time .
> >
> > With a 2.5 inch inducer you probably have an exducer of say ~3.3 inches ,
so your 99, 999 rpm tach should be just enough ...................but please
check the comp dia and do the calcs so that you don't exceed that 1450 ft/sec
limit :-)
> >
> > Cheers
> > John
> >
> > ----- Original Message -----
> > From: sswhuevos@
> > To: DIYGasTurbines@yahoogroups.com
> > Sent: Friday, January 27, 2012 7:55 AM
> > Subject: Re: [DIYGasTurbines] Re: Boost pressures and EGTs
> >
> >
> >
> > I'm going to do some work on it tonight. I haven't taken the flame tube
out yet to inspect how it is burning. Thanks for the info on the injector.
> >
> > The inlet on the turbo is 2.5 inches. I used that measurement to calculate
flame tube specs roughly.
> >
> > Ken
> >
> > Sent on the Sprint® Now Network from my BlackBerry®
> >
> > ----------------------------------------------------------
> >
> > From: "John WALLIS \(Racketmotorman\)" <racketmotorman@>
> > Sender: DIYGasTurbines@yahoogroups.com
> > Date: Fri, 27 Jan 2012 07:51:21 +1000
> > To: <DIYGasTurbines@yahoogroups.com>
> > ReplyTo: DIYGasTurbines@yahoogroups.com
> > Subject: Re: [DIYGasTurbines] Re: Boost pressures and EGTs
> >
> >
> >
> >
> > Hi Ken
> >
> > The rpm limit will depend on the wheel diameter as the Group has an upper
tip speed limit of 1450 ft/sec for safety reasons , so measure your compressor
wheel diameter , put the number into Jetspecs Turbo Analysis and it will give
you a rpm limit for your engine .
> >
> > Cheers
> > John
> >
> >
> > ----- Original Message -----
> > From: sswhuevos@
> > To: DIYGasTurbines@yahoogroups.com
> > Sent: Thursday, January 26, 2012 11:46 PM
> > Subject: Re: [DIYGasTurbines] Re: Boost pressures and EGTs
> >
> >
> >
> > I ordered a tach that goes to 99,999 rpm. It should be here today. What
kind of RPM should I be looking for?
> >
> > Ken
> >
> > Sent on the Sprint® Now Network from my BlackBerry®
> >
> > ----------------------------------------------------------
> >
> > From: "mot_mole" <jnissen@>
> > Sender: DIYGasTurbines@yahoogroups.com
> > Date: Thu, 26 Jan 2012 07:07:54 -0000
> > To: <DIYGasTurbines@yahoogroups.com>
> > ReplyTo: DIYGasTurbines@yahoogroups.com
> > Subject: [DIYGasTurbines] Re: Boost pressures and EGTs
> >
> >
> >
> > Ken fairly low T4 temps. DO you have a jet nozzle on it or just a straight
pipe? At 22 to 24 PSI that is really pushing it. Be careful of over revving. Do
you have a tach for it?
> >
> > Sounds like it's really moving.
> >
> > --- In DIYGasTurbines@yahoogroups.com, "Ken Herbert" <sswhuevos@> wrote:
> > >
> > > I put a boost gauge on my gas turbine last weekend and I saw about 22-24
PSI at full throttle running on propane. My EGT at turbine and thrust tube was
about 750-800F. The compressor side was around 1600F. Is this a good place I
need to be?
> > >
> > > http://www.youtube.com/user/hyprmtr?blend=1&ob=video-mustangbase
> > >
> > >
> > > Ken
> > >
> >
>