02-11-2017, 12:07 PM
(02-11-2017, 11:47 AM)ted johnson Wrote: O.K., we've all seen how Ernie F. and Dave B. solved the problem of a water pump for Ernie's Konig/Hovey. It's a beautiful, reliable, compact solution, but the Johnson and Jabsco standalone pumps are very costly. Has anybody else tackled this problem and come up with a less costly, robust solution? I know I can design and fabricate a pump using an outboard motor rebuild kit, but the machining needed for shaft and bearing support that'd be robust enough to drive off the engine will be expensive. If the kart is push started, like Ernie's beauty, driving the pump off the axle is the answer. However, this rig will have a clutch, so the engine wouldn't get coolant while idling with an axle driven pump. If the kart is axle clutch driven, we could drive the pump off the drive chain, using the pump sprocket as an idler. Thoughts? Thanks in advance. Ted
You could put the pump on a small jackshaft, or maybe copy or find one of the internal engine pump off of Italian engines, namely 125cc types I think several used this method. Many also offer axle driven pumps using oring drive.