| ~ may- june found a turbo off of a 198? Ford t-bird for about $50. spins well and has slight play. Fabricated a combustor using 4� outer shell 2 �� flame tube 1 �� elbow. Nozzle is �� copper tube with extremely small pin hole. Epoxy into brass compression fitting to 4� propane high pressure hose. Regulated by valve on tank and emergency ball valve. Ignition is by heater spark plug with long electrodes fired by car ignition coil. Coil is triggered by circuit-2. Oil is ATF provided by gm fuel pump between 5-40 psi. oil pump is circuit-1. ~ july testing of original combustor design. Holes were approximately as shown flame blows out very easy. Increased size of nozzle hole a little and covered up second row of secondary holes. Improved greatly. Attempted to run on turbo, but the flame blew out before idle speed. Closed primary vanes slightly and covered up most of first row secondary holes. First successful run achieved. Cost at this point is about $230 ~ august Increased size of nozzle hole to about 1/32�. Ran up to much greater speed ~120,000 rpm with unstable part throttle and full throttle, blew out easily. Built tachometer, circuit-3. Closed primary vanes most of the way and opened up dilution zone a lot. Stable at full throttle mostly stable at part throttle. Runs fairly cool (doesn�t glow). Top speed recorded was 123,300 rpm 2055 Hz. ~ mid October welded a short piece of pipe to exhaust to attach nozzle. built exhaust nozzle with 2 �� tube cut about 4 inches in six places to bend in at end. Made no noticeable change to speed or temperature at low speed ~50,000 rpm good platform for afterburner. November 24 Welded piece of 5/16� steel tube with very small hole pointed toward exhaust turbine into exhaust nozzle about 5� from turbine. And installed spark plug about 3� after that. fuel used was kerosene using gm fuel pump and circuit-4. Initial testing was with leaf blower off turbine. did not ignite. Used torch and still did not ignite. Note to self, kerosene is very non-volatile. Tried on running turbine, and was not able to get a flame with spark plug. Holding torch at end of tube produced a very unstable weak flame outside of the tube. November 26 Received a turbo from work off of a 6.5L diesel from a hummer. Spins well and does not appear to have excessive play. It is completely full of soot and diesel grime. The exhaust housing may be unusable due to the odd inlet configuration. November 30 Tried running denatured alcohol in afterburner. Had the same problem. Enlarged the hole. Made a bigger flame, but it was still outside of the tube and would not stay lit. I�m going to take it apart and rethink the whole afterburner. Cooked a hot dog with the exhaust (not with the alcohol on of course) cooked a little too fast. Would recommend using longer stick and holding it further away from nozzle. Creates good heat for possible grill attachment. |
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