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Old 08-09-2017, 12:17 PM
BAISowner BAISowner is offline
Join Date: Aug 2015
Location: Walnut creek, ca
Posts: 18
Default Wtb MS MA4-SPA 10-3678-32

Own an RV9a with LyCon O320 with Vetterman exhaust. Has the MS 10-5009N and it's just is too lean at wot.

Geoff Logan
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Old 08-09-2017, 04:16 PM
patterson patterson is offline
Join Date: Mar 2005
Location: Queen Creek AZ
Posts: 364

I have a brand new 10-5217 MA4 on my shelf that comes stock on a 0320-D1A. If you are putting out more than 160 hp you may need to ream the jet slightly (very slightly) to get the fuel flow to where you need it. I can help you sort that out. Not difficult, just takes a bit of time.
RV-4 N8ZD Sold
F4 Raider under construction
regular VAF donor despite being exempt
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Old 08-09-2017, 06:01 PM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 2,266

I have a 3678-12 (-12 runs a tad richer than the -32 but otherwise almost identical) It was rebuilt before installing in my O-320 2 years ago. Jet is the upgraded pepperbox jet (for better atomization) and is drilled for the 320 in the RV. It worked very well on my engine for 80 hours and then I upgraded to an FI setup.

PM me if interested.

RV-6A / IO-320, Flying as of 8/2015

Last edited by lr172 : 08-09-2017 at 06:09 PM.
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