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  #21  
Old 02-03-2009, 08:23 AM
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Lycosaurus Lycosaurus is offline
 
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I just received my re-drilled jet/carb back from Bart late last week. Quick assembly (wow, did not remember there were so many parts attached to the carb), and I test flew it on Saturday. Now my max fuel flow I see is 12.8 gph. I did not have a chance to do much testing.

The original jet was .093, and it was drilled to .101". Looks like one drill size smaller than yours, Steve. Then again, the original jet was one drill size smaller than yours as well.

More to come...
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  #22  
Old 02-03-2009, 10:58 AM
Steve Sampson Steve Sampson is offline
 
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Default Little boys gallons....?

Quote:
Originally Posted by Lycosaurus View Post
Now my max fuel flow I see is 12.8 gph. I did not have a chance to do much testing.
Alfio, Did we teach you right in Canada and that is Imperial gallons, or are they just lilly livered little American ones? :-)

The reason I ask is that 12.8 is less than the book number for a Lyco at 160hp and we are looking for more. At 59LPH I am now sucking up about 15.5USG, though its probably on the rich side now.
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  #23  
Old 02-03-2009, 11:08 AM
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Lycosaurus Lycosaurus is offline
 
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Default Little American ones ... gallons that is.

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Originally Posted by Steve Sampson View Post
Alfio, Did we teach you right in Canada and that is Imperial gallons, or are they just lilly livered little American ones? :-)
Canada ditched the gallons all together, and went with Liters (metric) a while ago. In aviation however, I decided to stick with gallons (US), kts, and pounds. Old school I guess (why am I called Lycosaurus?). Only air temps are in Celsius (go figure....)

I need to verify the fuel flow accuracy. I should be getting at least 13.5 gph according to the Lycoming engine manual. I do have a fixed pitch, and don't get full rpm (drag, climb etc) at this point. I suspect you have a constant speed on your setup, which allows you to go 2700 rpm.

My takeoffs are at around 2250 rpm. I don't have any gear leg fairing, pants (spats for you ...) or intersection fairings. Difficult for me to achieve 2600 rpm propeller redline. Will be doing more testing at altitude, and perform the lean-out peak test to see how much richer my mixture is than peak.
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  #24  
Old 02-04-2009, 08:52 AM
BD4Guy BD4Guy is offline
 
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Default Volare Conv Kit?

Go to the Aircraft Spruce website and search for "666-660". It's labeled "Volare Conv Kit" and I am pretty sure it is a re-jet kit. The Corona store is supposed to be checking what carb it's for, they just started carrying it, and didn't have any in stock. It was listed in the online catalog only. It may be for the MA 4-5 carburetor.
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  #25  
Old 02-04-2009, 09:04 AM
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Lycosaurus Lycosaurus is offline
 
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Default Float SB

Just wanted to add... while I had the carb out at Aerosport, I asked them to look in to the float SB. Mine was affected, so I asked for brass floats. Bart at Aerosport agreed that these brass floats are fine, especially if you intend to use mogas at some point. They can also be adjusted more easily.

Recommend that anyone opening up the carbs check into this service bulletin, and decide whether to comply or not at that point. Heard of some people having their floats fill with fuel (new carb).
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  #26  
Old 02-04-2009, 09:23 AM
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Alfio,

I was one of those people who had carb filled with fuel after 136 hrs. Bart replaced them with plastic floats. So far I have no problem.
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  #27  
Old 02-04-2009, 09:32 AM
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Lycosaurus Lycosaurus is offline
 
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Ted, I did not remember that you had a problem with the floats. I had heard of other people on this board that had some issues as well. Did not want to find out the hard way... given that other people have had real-life experience with this, I decided to change them out.

I basically paid $100 for the brass floats, since I believe they will fit my application better. I prefer the devil I know .... [edit: confirmed that I have new Kelly Aerospace floats now. They are not covered by SB]

Issue with the brass floats is you have to have them installed properly (no opportunity to rub on carb bowl), and when the carb is serviced, need to verify for wear. Then again that applies to plastic floats as well, you would think. [edit: confirmed that I have new Kelly Aerospace floats now. They are not covered by SB]
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> 1,000 hrs tach.

Last edited by Lycosaurus : 02-04-2009 at 12:34 PM. Reason: [edit: confirmed that I have new Kelly Aerospace floats now. They are not covered by SB]
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  #28  
Old 02-04-2009, 09:52 AM
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tc1234c tc1234c is offline
 
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I had fuel leaked down my airbox before I did any carb mod. I thought that I over pumped the throttle (accelerator). Took me a little while to realize it was due to the carb bowl overflow. Nothing bad actually happened before I called Bart. I only remember that brass and plastic both had their own problems. Just don't remember what they are.
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  #29  
Old 02-04-2009, 10:13 AM
Steve Sampson Steve Sampson is offline
 
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Quote:
Originally Posted by Lycosaurus View Post
Just wanted to add... while I had the carb out at Aerosport, I asked them to look in to the float SB.
Alfio, the carb SB has gone over my head, and I am having difficulty finding it.This is my float, clearly its not brass and I wouold not have thought delrin. Is this what I am meant to have? Can it take mogas do you know? Is there a downside to it?

Thanks
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  #30  
Old 02-04-2009, 10:38 AM
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Lycosaurus Lycosaurus is offline
 
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Quote:
Originally Posted by Steve Sampson View Post
... clearly its not brass and I wouold not have thought delrin. Is this what I am meant to have? Can it take mogas do you know? Is there a downside to it?...
Steve,

You may want to check the VAF archives. I believe someone referred to the problem floats translucent or black (see a further post on this thread for Brian Chesteen's post). The 'smurf blue' seems to be the latest one according to Brian. Seems older ones soften up even with avgas, as evidenced by other VAF members, and will fill up with fuel .... not good. New plastic floats are supposed to be better, but I just don't know what the compatibility with mogas will be. It may just be fine, but I don't think they would test for it anyway.

The brass floats had some issues whereby they were worn, and in that state, could rub agains the bowl sides I believe. Anyways, it caused them to leak. There seemed to be a limited number of such cases, however a SB was issued. Again, this "because of the long life of these carburetors...", the hinge point was worn, causing issues.

Read the SB below:

http://www.lycoming.textron.com/supp...pdfs/SB582.pdf

Upon my suggestion to replace the floats with brass, Bart confirmed that brass would be my best bet for mogas use (I trust his expertise and judgment). It cost me $100 or so ... small price to pay (0.1 AMU). [edit: confirmed that I have new Kelly Aerospace floats now. They are not covered by SB]

Sorry for diverting this lean/rich jet mixture discussion, however floats that sink (partially) will probably cause a mixture change, and if opening up the carb to rejet, then this SB should be looked at as well. There..... that's my justification :-)
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> 1,000 hrs tach.

Last edited by Lycosaurus : 02-04-2009 at 01:18 PM. Reason: Correction to show smurf blue color seems to be the good floats .... as per Brian Chesteen
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