In the Beta JD3 Classic Tug Engine thread there was mention of the suitability of the Greaves engines for narrow boats,i have since then received the following information from Phil Lizius at Longboat Engineering and include it here with his blessing in the hope it might prove helpful to others seeking a traditional looking engine at what seems a reasonable price,Phil writes as follows ," Please find attached the dimensional details for the Greaves 2YWM and 3YWM engines. The dry weight of the 2YWM is 327kg and for the 3YWM it would be 402kg. You would need to add approx 150kg for the gearbox and adaptor plate, assuming that you went for the PRM260 gearbox. Other gearbox options would vary.
2YWM The overall length of the standard engine, fitted with a PRM 260 gearbox is 48.25 inches from the gearbox flange to the end of the crankshaft extension. If the raised hand start is fitted an additional 7 inches is required to allow for removal of the starting handle. If hand start is not required and space is at a premium, the front crankshaft extension can be shortened by 5 inches, provided that a second alternator is not required.
3YWM. With all the above dimensions you would have to allow for a additional 7.5 inches for the extra cylinder. The PRM 260 gearbox is still within capacity but the PRM500 might be considered to give a better safety margin. This would add approx 5 inches to the overall length and approx 30 kg to the weight.
My thoughts on engines, narrowboats and other related matters.
With a 50ft by 7ft hull of conventional narrowboat design, the 2YWM will provide sufficient 'power' to drive the boat against all but the most serious of river 'flood' conditions. Under such conditions, you probably will be prevented from navigating by the Authorities. The constraints will be the size and design of the propeller fitted to the boat. In an ideal world, the 2YWM should 'throw' a 28 inch x 24 inch propeller. This would require a draught of 34 or preferably 36 inches. This is obviously not practical on a boat used mainly on the canals. The compromise position, is to fit a 22 x 17 inch prop, which would give a draught of 26 or 28 inches. This may result in reduced performance on fast flowing rivers but in practice this compromise works reasonably well in all but the most serious 'flood' conditions. Fitting a larger engine, such as the 3YWM does not resolve this basic problem but has other implications such as the engine having to 'idle' for long periods and failing to reach full operating temperature. In all, I think that the 2YWM will be more than adequate.
In an ideal world, the 2YWM would require a 5ft engine room and the 3YWM 5ft 6". This allows space for easy maintenance but can be reduced at the expense of this ease of maintenance.
At the moment, I have only a re-built 2YWM in stock and this is spoken for. I am waiting to hear from the Factory regarding delivery and current prices but they are notoriously slow to respond. I would estimate that a new unit, with PRM 260 gearbox will retail at about £10,500, which will carry a Manufactures 1 year warranty and a further, restricted 1 years warranty from Ourselves. "