I was looking at your intake manifold/plenum and was wondering how it seal into the inlet ports. I re-read your posts and it looks like the 'spigots" on the sides of the manifold are inserted into the barrel inlet ports when you assemble the engine. How does this seal? Is there some level of "give" to allow for heat expansion and vibrations?
I hope so
Yes; the 'spigots' are inserted into the intake ports/'necks'.
The seal I mentioned earlier ( page 4 I think) :
Here's another small improvement on this almost-seventy-year old engine.
Originally the notorious 'sealing'-rings between the cylinders and the in-take
is made of brass, which inevitably will turn brittle and leak.
Don't really want that, particularly
on a blown engine.
Indian Parts Europe has managed to have these
space-age-unobtainium thingies made:
..from some sort of nylon-like material that will not change properties
subjected to intense heat (and cooling and etc.).
You get them over
sized and they are then machined down
to your specific (in this case ; home-made) intake,
for perfect fit.
As you can see it's tapered ( is that the correct term?)
and there's an 'opposite' 'taper' inside the bolt-thingies
that screws onto the outside thread on the intake-'neck'
Other people's experience with these intake-seal is that they really do
keep tight, even on my friends souped-up Chief.
This bike running alcohol should experience
less heat expansion etc., so I'm optimistic.
The part of the intake with the 'spigots'
will vibrate along with the engine,
and then there's a rubber-tube connection to
the second part of the intake which is mounted to the blower (bolted directly to the frame)
If the seals don't seal, this being blown and all, I'll take it from there.
I'd rather not, but may be forced to, use some silicone material
I am not a big bike "guy" but there are so many really neat bikes being built for the BUB, and ours is one of the neatest!, that I am going to plan a "business trip" to Salt Lake City the week of the BUB and probaby just happen to stop by. See you then.
Thank you for your kind words.
Yes; please stop by and say hello!