Compression Plate Side Cover

[Mike Sal]

I ordered a new one from Wayne, but it looks awful.  It looks like a jitterbug sander was used on part of it.  The only reason I ordered a new one was that mine was dull looking & I didn't know how well it would clean up.  What's up with the finish Wayne put on it?  It will take a lot of sanding & finish work to make it look ok.  I'd be better off with my old one.
Mike Sal

[admin]

I got one from Wayne last year and it was a smooth mill finish on it.  Call him and see what's up.

Rick

[mywaymfg]

I've got one ordered and on the way probley come to me latter this week.nothing to compare it to my original is MIA. Let you know how it looks.

[Mike Sal]

I had thought about just making one from some stainless steel (I have whitney hole punches and some stock laying around), but I wanted to have the "stock" appearance. 
Mike Sal

[mywaymfg]

A bit swirly but just happy to have it , ill polish on it some see what happens

[mywaymfg]

I thought I would post a pic here of the back side of the compression plate I've never seen one before until today and its been a bit of a mystery to me as to what it was, so if any other guys out there have ever wondered mystery solved.

[Ricks]

That is not a factory compression plate.  Wayne does not have any used ones so he started making aluminum ones.  I don't think you need the cover plate with those, as I assume in is solid.  The factory plates are stamped steel, and are dished,that is why they use a cover.

Rick

[Mike Sal]

I've wondered if it would be of any benefit to put a filler in the "hole" between the compression plate and the cover.  I would think that any "rattle" in the engine would be amplified by the "drum" created by that space.  Any thoughts?
Mike Sal

[kartjockey]

My '48 just has a flat disc. What is the point of the inserted section?

[Mike Sal]

The portion of the compression plate that "goes inside" the crankcase is to take up space to even out the volume above & below the piston.  I wonder how differently your bike would run with one vs not having one.  I seem to recall someone saying that the motor would be harder to start. 
Mike Sal

[mywaymfg]

I was told they wouldn't run at all. Mike could you post a pic of an original with both pieces

[kartjockey]

When I got my bike it had two of just the covers and no insert piece. I thought that to be a bit redundant so only used one of the flat discs. Truth is they do run without the insert piece. I have been doing it for years. Things is it makes perfectly good since that it would take up volume thus being able to charge the cylinder better. Mine has always started well.

[oil-lamp]

Those plates or there so when the piston travels up it will create enough vacuum in the block to draw air/fuel mixture in. If you take it out and just have a flat plate there you would cut the vacuum down by over 50% or more. The smaller the space the quicker vacuum starts as the piston travels up so more air/fuel mixture is drawn in.

[Ricks]

I'm really surprised to hear that an engine would even run without a compression plate.  Your motor must have outstanding vacuum.  Tom, have you done this on any other simplex motors, or just this one?  Wayne at one time had a high compression cover, but I don't know if it really helped or not.

Rick

[Mike Sal]

Here's what the stock compression plate looks like.
Mike Sal