EA 81 + T3 Turbo Charger

[Russell]

Checkout our mast heights them days. Reeeel easy wacking the ground at the back. Ol mate there was 1st officer for the PM"s jet, them days.....he loved gyros.He built his own designed 2 engined ultralite, 2 seater, somewhere.....I got pics of it. ( was same name as that doctor who time machine thingo.....he based his design off that aircraft, it flew real good )

[Russell]

5Going ??
..........

[Russell]

6Ditto....and gators bigger than a semi.

[Russell]

7Going somewhere..??

[Russell]

Sorry about the pic qualities......I"ve re photoed photos, that are 20 plus yrs old, faded, going orangey coloured etc. found a shyte load of old pics, and using an App here, I can resize them to post here etc.

[chook]

Chook ol mate.......your carby guy is tawkin through his ar"e. My very first gyro ( 1973 ish ) had a 90hp Mc Cullock hanging on the back, that mongrel thing would backfire 26 times trying to get it fired up, but when she did, Christ it had some grunt. So your mates advice re them foam filters I"ve proven wrong.Russ this guy specializes in carbs for motorsports and has some 45 years experience so he has obviously had some experience with these things catching fire otherwise he would not have mentioned it. Perhaps in your case the foam was impregnated with oil from the 2 stroke mix which saved your bacon - who knows?But the advice is there for anyone who wants it. I"m now running a paper filter for 2 reasons. 1) as above & 2)It was much easier for me to modify the stainless housing of the paper filter for the carby heat plumbing.Regards.......Chook.

[Russell]

Yea chook...oil imprgnated filter maybe saved my bacon.....thanks

[NiqueNaque]

900?? That is very hot.. Does petrol actually burn at that temperature? I"ve seen temps of 700 mentioned and I am looking for the fair dinkum value.. I recall seeing a bmw engine torture test at 6000RPM with the exhaust system glowing bright red.. have you compared the color to a tempering chart?http://s259.photobucket.com/user/Sco...t-1.gif.htmlIt sounds like it might be running lean in comparison to mine, I can"t tell you what the burn rate is but I will be able to soon. Mine has quite some soot in the exhaust system so I assume it is running quite rich, but it isn"t blowing black smoke like it used to when the accelerator pump is in action - it is nice and clear. Your revs are 4850 from what I recall, mine are about 3800 max at the moment, I"ve pitched the prop up to 20 degrees from 15 at the tips, so it has gone from a 72x54 to a 72x73.5 prop. I did this to prevent it from running amok and might back the pitch off in half degree increments until the revs are maxing at 4500, I would be happy with that rev range if it flies in that configuration... maybe a 72x72 prop arrangement will be best.Try dipping your egt probes in 100c water and see if they measure that accurately... then you could try some boiling oil if you know its boiling temp to check calibration... or you could use a blow torch and one of those infra-red temperature scanners. Maybe the probes aren"t calibrated?

[NiqueNaque]

So your prop at 19 degrees is a 68 x 22/7 x tan 19 = 65.7".. or 68ø x 65.7pitch.Mine presently is 72ø x 73.5pitch, it too is a warp drive prop - three blade but not wide chord - maybe 3" chord. The revs are 3800 and EGT"s are 700°, boost at the turbo is about 2psi, vacuum at the carburettor throats is 5" Mercury, both are the same. From memory the main jets are 185"s, the carbs are single downdraft ICH34 Webers and it does run rich.I am intrigued as the the difference... does your manifold glow at these temperatures - at 900° it should be pretty brightly coloured.

[tonydenton]

browny, you never changed "anything" except making the exhaust 2 unto 1 and picked up 400 rpm. that"s quite a pick up and at the top end is quite a few extra horse power. I have 2 into 1 also but have had all along. I did go from a single suby carby to twin 1 3/4" SU"s and that picked up 200 rpm which was a bonus. the other bonus was the fuel dropped from 20 lt hour to 15. didn"t take long to pay for the change over with that saving.

[tonydenton]

with all those horse power increases from naturally aspirated engines I can"t see the need or worry to have a turbo .

[NiqueNaque]

126MAP (kPa) is 18psi.. confirm this is either absolute or relative... if it is absolute then it is 126 - 101.3 = 24.7kPa or 3.5psi, my boost is max 2psi. or 14 kpa or 115.3MAP at the compressor, not the venturi, the venturi MAP is 83.8. Your gauge will read 101kPa if it is absolute when the engine is stopped, if it reads 0 then the following applies:If it is relative :-O then you"re running nearly 2.25 (101.3+101.3+24.7) atmospheres and your throughput is huge.. 900 in this case would not be a surprise at all.At 3800 my estimated absolute MAP from the 5" hg or 2.5psi vacuum at the carbs is 101.3 - 2.5x7 = 83.8MAP. I"m going to decouple the compressor & see what happens without boost to compare a before & after.So you have 126-83.8 = 42.2kPa - nearly half an atmosphere more pressure than mine. From P1xV1/T1 = P2V2/T2 then the volume processed to compare is for yours compared to mine: 126 x 1ltr = 83.8 x V2, so V2 = 126/83.8 = 1.5

[NiqueNaque]

Browny,You say it is not running as smoothly as it used to.. Have you checked the spark plugs and leads for break-down in them- run it in the dark and see if there are any stray sparks from leakage?Change the plugs, points, condenser and see if that affects it.Is your rotor cap OK - clean with correct clearances?Is your rotor button OK - clean with correct clearances - does the centre pin make good clean contact with the button?Is the coil breaking down?Are the fuel lines to the injectors clean and free of debris?

[tonydenton]

browny, what is the tappet clearance with hydraulic lifters , this is just for me to set mine again.

[NiqueNaque]

Browny - You"re welcome - always happy to ask stupid questions that might have a smart outcome...Now... are you running mineral oil or synthetic?