B335

OTHER: Miscellaneous - SynchroLite - 1 vs. 2 Engines

Overview:

	1 Engine:			2 Engines:
		Weight:	Price:		Weight:	Price:
Engine:	1 only Hirth 2706	79# w/ exhaust & electric start	$3795.00 w/ carbs	2 only Hirth F-33	2 * 35# w/ exhaust	$2020 each w/ tuned exhaust
	1 only Zanzottera MZ202	68# w/ exhaust & electric start	$3200.00 w/ carbs	2 only MZ 34	2* 32# w/o electric start & reduction	1700.00 each w/ electric & recoil starter
Mast:					2 * 6.5#
Frame:					13.3#
Primary:					2 * 3.94#
Secondary:					2 * 14#
Soft Start:					2 * 1.5#
Lubrication:					3#
Synchro:					13#
Exhaust:		included	included		included	included
Total: (Hirth)					133.8#

Notes:

When comparing the allowable torque and weights of overrunning clutches gears and 2-stroke engines it is apparent that a doubling of the allowable torque results in a near doubling of the weight. Any discrepancy in this ratio will be offset by the elimination of electric starter, battery and wiring that is not needed for single cylinder engines. The cost ratio of twice as many half-size parts may also hold, because of quantity discounting. See also ~ Duality

Pluses for 2 engines:

Two engines should be lighter than one because there is no electric start.
The cast housings are simpler and there are two patterns vs. three.
Planetary gearing and Goodrich belt will result in smaller power loss and therefore drive train components can be slightly smaller (lighter). [3% vs 5% = 2% * 50 hp = 1 hp] [1/50 * (75# power train) = 1.5# saving]
Change to helical planetary gears may increase the price but will decrease the weight. 2x quantity will help with price.

Pluses for 1 engine:

Exhaust might be slightly lighter.
It appears that a two cylinder engine has slightly more power than two times the comparable one cylinder engines.
The Rotor-synchro box is an addition.
Fewer instruments and power train controls are required.
Splash lubrication will probably do since there is only one box.

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Last Revised: May 7, 2004