In all honesty I used the twin blowers as I had two extra #4 blowers and was like....why not this will be killer. If I were to do another Vwtm I would look for a 47 or bigger and direct couple it, the optimum rpm range on vw is 27-3200 rpms with its stock cooling fan.
I was contacted by a guy that worked for Pro Line in Sac, years ago, there was a carpet cleaner in the Sac area, that had built a TM using a vw motor that drove a 59 blower...He said it was very impressive had a ton of power, was very quiet he got to see it run, and very reliable from what the guy told him.
I was contacted by a guy that worked for Pro Line in Sac, years ago, there was a carpet cleaner in the Sac area, that had built a TM using a vw motor that drove a 59 blower...He said it was very impressive had a ton of power, was very quiet he got to see it run, and very reliable from what the guy told him.