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
I would think you have enough stuff there to get a blower put together. I am going to have gears made for one of mine and will probably have shafts made as well just to have a spare. You are correct about the H&H blowers. They look the part but are nothing like the original SCOT blowers. They are basically a Wieand 142 blower with a case that looks like the SCOT. When they produced those blowers they were based on 142 internals and The reason why Mike at H&H doesn't mess with them anymore is Holley Discontinued the Wieand 142 supercharger and So they can not get the internals for them anymore. Not to mention Max Sr, P***ed away. And as I understand it Max Jr and Mike do not see eye to eye on the future of the business. That's just what I was told by people who know them well.
Difference ? Does the SCOT , All made just have a straight 2 lobe per Rotor ? if so why not have made Twist 3 lobe per rotor ? Then you will deal with Lean on rear cylinders might not be as noticeable Or Issue " lean" on smaller cases , The 3 lobe would not have to turn as hard, @ less speed, more efficient , trap with less chance bleed back as boost builds then the straight 2 lobe rotor .
I found this thread interesting because I too have an empty case. I bought it at the fathers day swap meet years ago from a guy unloading it from a trailer, paid $200. I thought about trying to find parts to build it but decided I will just enjoy it as is on a mock up engine. The interesting thing about this case is it has no horizontal rib, seems it was cast this way. I have never seen another one like this, either in person or a picture. I will be interested to see what you do for gears.
Custom Helical Cut Gears, Or maybe same gears as others Helical gears. Looks that stock where straight cut , Helical would be quieter and easy to time the rotors
IIRC, Ronnie Roadster had new gear sets made. Maybe by Boston Gear. Contact Ronnie as he is extremely knowledgeable about the S.C.O.T. and Itacmecannica blowers.
Agreed, contact Ronnie Roadster. He currently has my Italmeccanica and tells me he can have new gears cut. He says its pricey and can take time as the machine shops busy. Apparently timing the rotors and pinning those gears to the shaft can be a difficult procedure. He will install new bearings and and set clearances. If it works out, I will send him another vintage Italmeccanica for rebuild. In the meantime i purchased a new S.C.O.T blower from Max Junior of H&H as I don't want to hold up my project. Steve from AMS in Fresno is building two identical flatheads (new french blocks) with the best pistons, cams and everything else he recommends to run these blowers so lets see how much boost they really put out in comparison. P.S. Theres a great article in the April 1976 volume of Street Rodder that goes into all the details of rebuilding these blowers.
Having had my hands in a lot of original Ital and S.C.O.T blowers the big problem with the parts you have is the rotors. They are not Ital or S.C.O.T those rotors are what one will find in B&M and Weiand blowers. The rotors used in the blowers from Italy do not have splines for the gears. The original rotors have different ways the gears are held in place it could be a straight shaft where the gear is simply pined in place or a taper with a keyway to position the gear in place with a nut to hold it. This difference in how the gears are held in place has no common pattern each type of blower be it Ital or S.C.O.T from my experience could be found with either of the two types of how the gear is positioned on the rotor end. The way the original rotors were made was a casting over a steel shaft. This rotor casting was then machined for the overall diameter and length. The lobes are also hollow they were rough machined internally. Each part used in these blowers put together have an identical two digit number the numbers represents there accuracy for ***embly as one unit. The rotors were the only part to not have a number since the rotor length and diameter were all the same. The machine work on these blowers is rather crude but considering the time frame being late forty to the mid fifty's its understandable. Ronnieroadster
I contacted H&H after the acquired Sharp. I was interested to see if they had any information/information on the Sharp Chevy 6 intake I and also if they had any plans to reproduce and of those items. Matt was downright rude and obnoxious as, soon he answered even before I asked! I understand they are in the Ford flathead business, and I was asking about Chevy six parts but that didn't mean I wasn't going to order parts in that call of in the future? After that I will never do business with them!
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