Yeah TomC a nice shortened GM V-6 story.
Design-wise: whether the designer goes with a 15 degrees between the banks;45 degrees; 60 degree; or 90 degrees they can have uneven firing input impulses degrees simple common rod journals AND uneven mechanical balance; OR even firing impulses with split rod journals and still have uneven mechanical balances both of these tamed with soft exotic vibration dampening motor mounts. Fords hydro-elastic mounts.
OR, as most production V-6’s do use 60 degrees and compromise the firing impulses and the mechanical balances with more robust/common motor mounts. Chrysler/Dodge. OR, use 90 degrees split crank journals AND add inside the engine a counter rotating weighted balance shaft as most of the GM Buick V-6’s became.
Honestly V-6’s are chosen for fit between front drive wheels packaging. Lighter weight than an inline 6.
Back to F.P.'s request for a small currently available electrical generator/pumping engine for use in Africa.
then click onto "tiller"
As you can see very portable.
Yanmar themselves do not seem to directly supply this older engine types as a pump set. Or electrical generator set anymore. As electric welders, yes.
Yanmar seems to have very robust Indonesian, Thailand and Singapore dealership networks in these older plain and simple engines. Australia? Still? Maybe? Bootlegged in?
For us in the US/Canada and the EU from Yanmar we now can only get their more modern mush higher speed, much higher compression, 3000-3600 rpm designs (poor gasifier conversion candidates) carried into the now mandated higher levels of exhaust restrictions requirements.
The Chinese clone copies get worldwide distributed anyplace they can be shipped (legally) into.
I will bet these are already there where your African users reside.
The Chinese engine model numbering system is such:
Letter/Letter/one digit/2nd digit/3rd digit/4th digit - with maybe a suffix letter or two.
The first letter means air-cooled, or water-cooled; with hopper/evaporation water cooled or radiator/condenser cooling.
The digits are first the number of cylinders; then the cylinder bore diameter in MM. Examples: xx170, xx180, xx186, xx195, xx1115 = one cylinder, 70mm, 80mm, 86mm (mine!), 195mm, 115mm.
The suffix letterers indicating electric starting capable and a battery recharging system, etc.
Overall the people using the Chinese clone engines of this type say they are happy with the quality. Unhappy as there is some NOT interchangeability of parts between the different Chinese factory/brand names in the same power/size ranges
External identification is if the manual cranking socket port is inline with the crankshaft the engine is the much internally simpler design WITHOUT the two internal counter balance shafts.
Hand cranking port to the rear of the crankshaft center line then it is actually onto the end of one of the two gear driven counter balnace shafts. Geared down 1/2 of engine rpm that makes for easier cranking on the larger displacement engines. Balance shafts add three gears, four bearings and more things to break/fail sooner or later. Some users report this at low use hours
Ha! Ha! Balance shaft failures problems killing the block: a Mitsubishi I-4 problem, especially on their turbo engines. Failure problem on one series of Kohler aircooled small engines too.
Big names can get bitten with over-enthusiasms designs too. Fire the designer AND the marketing director too.
tree-farmer Steve unruh