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Member Since 04 Apr 2011
Offline Last Active Yesterday, 08:26 AM

Posts I've Made

In Topic: Ebay vintage engine sales

07 January 2017 - 06:46 PM

...just as the official end of production for Gardner LWs was about 1973, but there are examples around built in the 1990s (I think that the very last 2LW was outshopped in 2000). After all, if a customer is waving money about and you've got the parts, moulds etc. in stock, it would be silly to turn him away.

Seem to remember a batch of 2LW's were built in the mid 90's to service an order to replace worn out ones in South African mining loco's. A few UK orders were tagged onto this. Remember viewing a 1995 high spec nb built with a new one.

Marine Dorman 4DSM and gearbox - 20hp @ 1000rpm


In Topic: Starter Motor Current

04 January 2017 - 09:11 AM

I've a vague recollection of a vintage car engine which (at least when warm) could be started from nothing by moving the ignition advance lever between the extremities? I assume that at least one cylinder had fuel vapour in it when stationary; racking the advance / retard back and forth fired the spark and turned the crankshaft just enough for the next cylinder to take over.

Trembler coils, one for each cylinder controlled by a low voltage distributor, produced multiple sparks on early cars such as the first Model T's, allowing the possibility of starting a stationary engine when the advance/retard control was adjusted. Have witnessed this method of starting on a vintage Rolls departing a car ferry. Not sure it would work so well with more conventional single spark coil ignition system.

In Topic: Powering a 8KW motor from a generator

02 January 2017 - 09:30 AM

If you go back to the OP's original question, he want's to run the motor directly from a generator not via a battery.

Exactly but his proposal amounts to a fruitless re-invention of the wheel. What has been suggested is a proven alternative that still utilises a generator powering an electric propulsion motor, but in the most efficient manner.

In Topic: Starter Motor Current

01 January 2017 - 09:55 PM

CCA is time, temperature and voltage related but only likely achievable in a laboratory or possibly for the first few occasions the battery is used.

Although CCA and amp hour capacity of a battery go hand in hand, it seems to me the latter is a better parameter to be considered long term when choosing a starter battery, subject to its ability to supply adequate current in the first place. No point in having a high CCA battery if it fails to have the remaining capacity to supply the required current long enough to start a stubborn engine.

I'm sceptical therefore of Lithiom Ion baterries for start applications. Given their low weight they seem to be a popular choice in car racing applications supplying high CCA but with relatively low capacity. Interesting also that many hybrid cars whilst employing Li-Ion for main storage still use a lead/acid battery to start the engine.

In Topic: Powering a 8KW motor from a generator

01 January 2017 - 11:46 AM

Take a look at car hybrid systems. Remember that your electric propulsion motor won't be running at full chat all the the time, so a set of batteries to take up the slack and fill in when power requirements are highest will be by far the most practical and economic solution.

A relatively small and commonly available 240v AC generator driving a smart mains charger should be fine once the average power requirements are catered for in terms of battery bank size and charge capability. A bonus is that batteries can also get charged when shore power is available, with no additional equipment expense.