Professionally designed redrives for many engines since 2010. Single cylinder and V-Twin 4 strokes from 200 cc to over 1200 cc. Image is for a Briggs and Stratton 993 cc engine.
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------- > Whilst doing as much information gathering on other redrive types, we had a few people that said that an idler can actually induce some vibration (Many people who have these idler type had told us). There is a huge gap between those pulleys that can induce belt slap.Is there a "slack side" tensioner or spring loaded idler on these redrives similar to the system developed by Valley Engineering?
Although I am NOT an engine expert, it is my understanding that the tensioner effectively resolves certain problems that are common with belt reductions, and that the benefit is worthwhile.
-------> As I mentioned in another reply our pulley OD to OD has the bare minimum of clearance. 3 to 4 mm. This keeps the unsupported belt length shorter when it leaves the pulleys.What would be pitch between shafts, pulley and belt sizes for a small block vanguard with ~2.7 reduction ratio?
I know of a few of these engines that have been tuned to around 4800 to 5000 Rpm. They seem to be getting around 35 - 36 hp. Both of the ones that I`m thinking of use 60 inch props. One has measured the thrust at approx 100 Kg`s.5000rpm, optmistically hoping for 40hp. 84" prop.