I have been collecting pieces for a flathead SCoT blower for quite a few years now. First off I have a ScoT blower case with the complete front pieces, all in good condition but missing all the internal parts and missing the rear cover plate. There are 16 bolts that would attach both the front and rear cover plates. Next on the list is another SCot blower case in really good condition, again with no internal parts missing the front cover pieces but has a really nice rear cover plate attached. This case looks to have the same measurements as the first case, but this case has 12 bolts that attach both the front and rear cover plates. I go to the Hershey swap meet every year and you usually see one or two IT or SCot blowers for sale that would be for a flathead application. All the ones I have seen all had 16 bolts attaching the front and rear cover plates, but I have never seen a blower with the 12 bolt configuration. Would the 12 bolt case that I have be a later design from the SCot blower manufacturer? Next on the list is a pair of SCot or Itel blower rotors that I recently acquired. Both look to be in very nice condition and look to be the correct rotors that would fit into the SCot blower cases that I have. The aluminum rotor part measures 8 3/4 inches from one end to the other. What I'm wondering if the 12 bolt case could be used and the 16 bolt front case pieces be attached to the 12 bolt case? The existing holes would have to be welded up and new holes drilled and tapped to get the front cover to fit properly. I'm amazed that so many SCot blowers got taken apart for whatever reason, parts got lost and never got put back together. The story I got on the rotors was that the blower got taken apart, the garage got broken into and the thief stole the case but the rotors were left behind as they were in a different location. I realise that a main shaft and gears would have to be made and all seals and bearings purchased and yes I would be trying to put together a SCot blower from 3 different blowers. My question here is it possible from the parts I do have and the pieces that have to be made or acquired, is it possible to put together a SCot blower from everything here?
Why not contact H and H Flatheads and talk to them about it. They reproduce the blowers and all the components and they can probably sell you anything you are missing
The SCoT blower that H & H reproduces is much different than the original ones that I have. They made so called improvements to the original SCot blowers and now practically none of their parts will interchange with the original SCot blowers. Their blowers look very nice but I have heard from a few people that their blowers make almost no boost. Mike at H & H has distanced himself from the blowers H & H were reproducing and won't take orders for them anymore, at least that is what I was told. Contacting H & H does not seem like an option right now.
As these were made long before CC machining was even invented I'd be concerned about mixing and matching cases and ends regardless of the bolt pattern. The cases and end plates may have been hand fitted originally and swapping them could result in severe rotor clearance issues. I might be completely wrong on this but it bears researching.
Anything is possible if you know a good machinist (even better if you're friends with them). I would want to make sure that the bearing holes in the end plates are in line with each other within reasonable tolerances. GMC blowers used dowels between the case and end plates, I would ***ume these have or would require similar alignment features. With regards to mixing and matching I would square and machine both ends of the case and then machine the end(s) of the rotors to provide proper end clearance. I haven't looked for do***entation regarding building SCOT blowers but there are numerous old articles regarding converting GMC blowers from their original diesel application to performance parts. Conceptually you could carry most or all of that information over to your application.
https://www.jalopyjournal.com/forum/threads/who-rebuilds-scot-blowers.1275356/#post-14626009 This thread may be of some use to you^ I think a SCoT wouldn't be all that different from working with a GMC, guys have been mixing parts on those for decades. @whiteknuckle is absolutely correct, dimensions and clearances are the key.
Do you have Gears ? Gears I would think/ is most important To time rotors . Drive no big deal to make V set up or cog . Set up pretty much same on all , its about clarences , Rotors might be able to Teflon to give a better seal , Not like its hi helix
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