Thorp Air Command - T18.net

Is there a news letter regarding what MA4-SPA part number carbie suits our 0-320-D2A mounted in the T18. I see there are about 5 to choose from. Given the price of them, I don't want to test all 5 to find out which one will give a smooth running engine.

I have an O-320-D2A also. Bought it new from Lycoming through Dick Wagner at WagAero in the early '80's (cost - approx. $5400!). The MA-4SPA that came on it is p/n 10-3678-32. Over the years I've done the metal float kit & one-piece venturi. Back in 1995 I did a modification that cured the occasional "hiccup" (that seemed to always occur over mountains or water) - I replaced the fuel nozzle with a new "pepper pod" style, p/n 47-828. My home field elevation is about 5700' msl, and it worked very well. But after a couple months of experience with it, including lower elevations, I determined it was running a little lean. I reamed the nozzle out to 0.104" from the original 0.093". For the last 20 years or so I'd say it's just about perfect for me. Engine smoothness and fuel burn are very good. I've flown it from sea level up to 19,000'.

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John Evens
Arvada, Colorado
T-18 N71JE (sold)
Kitfox 7 SS N27JE

Sounds like what I have too. It's an O-320 B3B with original MA-4SPA, nozzle drilled to about .103 and decent performance. I've been 1100' to 11,000' but fly mostly 9000' from a 6200' field elev at home.

Les

I had to open my main jet John, not much, bi did open it up. I guess with each application some adjustments even if they are ever so minor, make that little difference........0320 E2D. Dan

Just to add more "fuel" to the fire, my O290G has an O320 sump and MA-4SPA carb p/n 10-3678-32, jet size unknown.

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Bruce Finney
N18JF T-18C #262
Yelm, WA USA