Carburetor for O-320/160

[Tomas J]

I need to find the right carburetor for my Lycoming O-320-E2D that is converted to 160 hp with high compression pistons. If anyone can give me assistance I would be very grateful.

[krw5927]

My E2D has a MA4-SPA carb. I havent changed the compression from stock but I believe the same carb would apply.

[fixnflyguy]

I have an MA4-SPA on my 160 hp O320-H2AD...works great.

[rv9aviator]

MA4-SPA is what I have on my E3D engine from a Piper Cherokee 140. I bet someone will will have the exact combination your asking about though. Ask Mel.

[Tomas J]

Thanks for the inputs.
Yes, it shall be the MA-4SPA, but it is available in different versions, including a different nozzle - 10-5009 and 10-5217. There is also a 10-3678-32. Does anyone know the difference between them? It's seems logical to use a bigger nozzle for the converted engine - is that the fact with -32?

[rvator51]

The 10-5217 includes an atomizer on the nozzle. It sure works great in our RV-4 with 160 hp. We can run lean of peak with it while we could not with the previous carb.

[jrs14855]

The atomizer nozzle can be added to at least some of the different pn carbs. the 5009 with the atomizer nozzle becomes 5009N

[Doug]

My O-320D1A (160 hp) came with a 10-5217 carb.

Doug Gray

[Tomas J]

What I have find out to now it that I can use 10-5217 or 10-3678-32. I have got indication that the 10-3678-32 would lean the mixture somewhat at partial throttle, might leading to less fuel consumption. Is there anyone having an idea about or experience of this.

[penguin]

Drill the main jet to 0.101" or 0.104" to ensure you have sufficient fuel flow for proper cooling at full power. I don't know what part number that jet is. I started with an O-320-E2D from a C-172 with an MA4-SPA, had the engine rebuilt to 160hp and had to go 0.101" to get the CHTs to even a sensible number. Cowling louvres have also greatly helped.

Pete