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T or F If building a conventional two lobe rotor system for a Roots Style positive displacement blower the two rotors should contact one another along a tangent the entire time right? (minus of course the minimal clearance needed for the thing to run.) What I mean is the rotors should not have...

Here's another pic with the gear set. RUSH Gears PN: R2002-AB4832

K, here's what I gotz I literally copied an image off of Wikipedia showing the basic rotor geometry. Then I imported the rastor image into Mechanical Desktop and generated an IGES file from it. (call it an ultra ghetto optical comparator) From there I brought it into my manufacturing...

60% nitromethane. The rest is methanol and erl. . .

I do have a pipe for it. However one can never have too much powaaahhh! :bow: :bow: I'm gonna build it. What the hell. It's a weekend project involving some computer work and whittling on scraps of 6061. Just gotta go find gears and bearings now. Thanks. C

Mr. Kaid from Eaton was pretty helful. So was Mr. Conley from Conley Precision miniatures. Mr. Conley: A supercharger/Forced Induction set up on a rotary valve piston port 2S engine won't work. Everything your trying to do gets pissed right out the exhaust port. In order for it to work, it...

I've been able to locate an engineer with Eaton Superchargers. He wasn't in the office today, but will be tomorrow. Don't know if he'll "play ball" with me on this, but hopefully so. If he does I'll certainly pass along what I find out. Nice job on your piece! Is this an aircraft engine by chance?

My education is limited to 12 grades. My math suffers as well but I've been able to BS my way through stuff for a long time now. There is math however that stops me dead in my tracks. I'm reading on superchargers. Hypocycloids and Epicyloids are kicking my butt. I have a Moki 2.1 cid front...

When I do jobs like this at work (full time gunmaker/machine shop owner) I start by qualifiying one end of the stock. Then I make/assemble some sort of stop in the chuck that the part can register on. From there it's a function of qualifying the opposite end and then turning your cylinders and...

If this is redundant, sorry. I didn't take the time to scroll through the other contributors. Poor surface finishes: 1. Cold Roll can be a challenge sometimes. If you can use cold rolled for your project, chances are you could get away with a leaded steel that'll turn very nicely. Just...

That is the part that I've always had a hard time grasping. It's widely understood that having a negative pressure in the crankcase helps with ring seal. I have no doubt it does but I wonder how exactly. It would seem to me that the exact opposite would be true. if it were possible to have more...

Wayne I'd love to take advantage of the "monkey see monkey do" principle. The challenge I'm faced with is that there is very, very little information floating around about this stuff. This side of things represents a microscopic % of the model aviation hobby. What complicates things further is...

Grab a big syringe. Collapse the plunger. Now plug the opening and pull the plunger back to generate a vacuum. There is resistance. (As one would expect right?) Now allow air back into the cylinder. Plug it off again and attempt to collapse the plunger once more. I think you'll find that it...

From 1992-1997 I worked in autoracing as a maggot and eventually a machinist for Paul Rossi Performance Engineering, Richard Conley racing engines, and Bill Craddock racing heads. Here's what it taught me: A 5 stage dry sump oil pump will pull around 30" of vacuum when the engine is above 10k...

Years ago I started my machinist career in autoracing in S. California. I've been around a few FI engines here/there. I recently sold my 2004 GTO with an LS1 that I drained a savings account into. I had a Magnuson supercharger in this car and here's what I learned over conventional roots style...

I didn't take the time to read through everyone's response so forgive me if this is redundant. The first thing I'd do is qualify your work holding (vise) to ensure it's square with the spindle in both the X and Y sides of the Z axis. For clarification. X is L/R, Y is forward/away and Z is...

Thanks for the replies. To clarify: This is a racing engine. I need 3.5hp per cubic inch to be competitive. Gasoline in an aspirated engine that's air cooled will never deliver that. I have 85, 100, and 170 cc gassers for my giant scale aerobatic planes that use spark ignition, etc. This...

Hi Guys, I joined this forum in hopes of getting some guidance by someone who's very knowledgeable about air cooled reed valve two stroke engines used for model aviation. Particularly with wringing them out for max performance. I am building an 80cc nitromethane/methanol glow race engine for...