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Old 06-13-2017, 01:51 PM
Flybob Flybob is offline
Join Date: Nov 2015
Location: Novato, CA
Posts: 4
Default Engine Advice Needed

Can anyone tell me the difference between a IO-360-M1B and a IO-360-B1B ??

I have found a IO-360-B1B and want to know if it will work for my RV7A that I am building and what if any modifications I will have to make.


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Old 06-13-2017, 02:11 PM
Steve Barnes Steve Barnes is offline
Join Date: Jul 2008
Location: Santa Rosa, CA
Posts: 545
Default Very similar to each other

There MAY be a difference in fuel pump types and slightly different type magneto.
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Old 06-13-2017, 02:12 PM
ccsmith51's Avatar
ccsmith51 ccsmith51 is offline
Join Date: Jul 2010
Location: Orlando, FL
Posts: 1,072

See if this helps.
Chris Smith
Maule M5-180C
RV-6 O-360 CS (Sold)
RV-4 O-360 FP (Sold)
Orlando, FL
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Old 06-13-2017, 02:40 PM
Berchmans Berchmans is offline
Join Date: Nov 2009
Location: Anchorage, Alaska
Posts: 417
Default Differences

The M1B has horizontal induction...I believe that the B1B does not...I think the B1B requires the chin scope where the M1B does not have a chin scope on the cowl.
Burke Wick
Flying RV 8
Anchorage, Alaska
VAF Dues Paid for 2018
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Old 06-13-2017, 02:53 PM
sierrakilo99 sierrakilo99 is offline
Join Date: Jan 2008
Location: Orlando, FL
Posts: 11
Default Check the Lycoming Type Certificate Data Sheet

There are multiple differences between the B1B and the M1B engine configurations. Trace it back from the TCDS:

The IO-360-M1B is similar to IO-360-M1A except it has a rear mounted propeller governor and impulse magneto; The M1A is similar to IO-360-B1E except it has a front inlet fuel injector, prop governor on front of crankcase and retard magneto; The B1E is similar to the IO-360-B1B except for the oil sump, induction manifolding and alternate magnetos; The B1B is similar to IO-360-B1A except it has a Bendix RSA-5AD1 injector and fuel pressure limit at inlet to diaphragm pump;

So, the B1B has a front-mounted prop governor, a different oil sump and induction manifolding, and Bendix mags with impulse coupling.

The B1B also weighs a little less than the M1B (11 pounds lighter according to the TCDS)

All the deltas in configurations can be located on the TCDS sheet for the Lycoming IO-360 engine available on the FAA website.

Hope this helps.

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