The BGM water pump I'm using requires 12V DC so I need to provide a suitable feed as my Lambretta has no battery, only 12V AC. Couple of things to be considered include how to mount this pump, I've used an original Lambretta condenser clamp. Looking at the diagram on the left "IN" is where hot water enters from the cylinder head and "OUT" goes to the radiator so orientation needs to be considered. The water pump ideally needs to be the lowest point of the entire system. Pump cost was about £70 from MB Developments.
This power module incorporates a zener diode and rectifier and replaces the standard Lambretta 12V AC regulator to provide 12V DC for the water pump. I got this after recommendations on the LCGB site, some classic British motorbike dealer named Wilemans Motors in Derby. Otherwise these are easily found on auction sites for around £25 and simple to fit and set-up. Instructions including wiring diagrams will follow which includes a modification to the stator plate.The radiato
r is from a Gilera Runner as the hose positions suit where I'll be placing it i.e. horizontally underneath the legshield floor, between the stand and the splash plate. (mounting the radiator could be challenging) Cost was around £20 from a motorcycle breakers. I don't plan on using a fan and will use the thermostat on the radiator as the main switch for the pump with a manual override switch. At this stage I'm assuming that the volume of water in the system and expansion tank (below) will be sufficient to keep the temperature down, even when in traffic.
Only the cylinder head will be water cooled and this was ordered from MB Developments. A really nice piece of engineering and a quick turn around (3-4 weeks) £170 all in. When bolted onto the engine the angled pipe sits at the top with the straight pipe pointing straight down. Remember hot to the top!
Other required items include a sender unit similar to the one shown below which the temperature gauge will use. Again both these parts are relatively easy to source.
So these
are the main components required at this stage apart from pipes, clips etc. I'm building a TS1 engine up at the moment to accommodate all this so will update when I have made some more progress!
