Did the Webra Speed .61 have the exhaust baffle mounting bar in the middle of the exhaust port, or was that the standard .61?

The "Speed" does not have a divider in the middle of the E. port...what you have is probably a black head?

The speed is schenurle ported and the black head is a baffled piston, cross flow design.

I don't recall either of them having an exhaust baffle. If you are looking inside at the cylinder sleeve there are bridges on the ringed piston's sleeve so the ring does not get caught in the port and destroy the engine.

Paul,


I believe PropTop was referring to the piston-baffle; not to one in the muffler.

The BlackHead and the Silver Line series engines both had a baffle/deflector on top of the piston, on the intake side.
It is required to prevent freshly inducted mixture from just flowing straight out of the exhaust.

The Speed uses a flat-top piston and angled schnürle ports, which achieve the same purpose even better.

Dar
I got the impression he was refering to a verticle bar in the exhaust port to attach an exhaust baffle like the old Supertigre, K&B and McCoy engines used to use for a better idle before mufflers. The Silverline and Black Head Webras had bolt on mufflers along with baffle top pistons. The speed series used strap on mufflers until they changed to bolt on mufflers. ABC and ABC type engines do not have ports with bridges in them as there is no ring to catch in the ports, but ringed engines do.

Yes, Paul, in some late '60s (early '70s...) engines, there was this 'flap' that pivoted on a bolt, screwed into the 'bridge' of the exhaust port. It worked together with the throttle using a double linkage, to improve idle quality by increasing back-pressure...

I don't remember that this part was ever referred to as a baffle...

Some refer to it is a baffle or baffle plate, others call it an exhaust butterfly...take your choice. It doesn't matter what it is called in this case, proptop knew what I was talking about and answered the question. I thought that it was a blackhead, but wanted to be sure before I used it.
Thanks to all.
Jeff

[8D]