First spoolup of 10/98 jet engine

[mightyfinejonboy]

intense LOL!!!

[donbruce54]

Almost there. Would increasing the starter voltage give you the extra revs?

[racketmotorman]

Will be trying 18 V as a last resort , the increased no load rpm could put the starter into unsafe rpm , will try preheated oil first

[racketmotorman]

Nope, comp nut is high tensile steel , coupling 7000 series alloy , guess who won the fight :-)

[stimps90]

Slowly getting there:) is the compressor nut rounded off now aftet that? Lol !!

[racketmotorman]

Yep, bearings felt the same as before the testing other than being a little freer as the lube heated up , the comp and turb blading clearances are reasonably generous at ~0.012" - 0.3mm for the comp and about twice that for the turb , normal sort of turbocharger clearances .

Just fitting a lube bypass to do some rpm testing with lower oil pressures .

[monsieurcollins]

Hi John, looks nice, saw you spin the blades by hand at the end was every thing ok for clearances?

[racketmotorman]

Yep , getting there , only another 5,000 rpm and she'd be "over the hump" and accelerating away to idle , hung starts are a bummer :-(

[JETGRAN]

so close ;-)