>
>>>
>>> I just came up with an idea that eliminates the small hole.
>>> Here are a couple of pictures of the problem area.
>>> This is the other side of the rotor housing from that
>>> side I repotted on Marks engine.
>>>
>>> Just clean this area up with a die grinder and hand cut
>>> a chunk of aluminum that just slips in. Bond it in with
>>> JB Weld BEFORE you cut the hole for the tube. Problem solved.
>>>
>>> It won't help Marks engine but the Stainless steel sleeve
>>> will do the same thing.
>>> --  Paul Lamar ...No rotor no motor.
>>>
>>
>> I have been watching this thread with great interest as I also
>> intend to
>> P-port my engine (to be installed in a BD-4).
>>
>> Many pictures I have seen of P-port engines have the port cut at
>> an  angle
>> that more closely matches the angle of the trochoid.  Would it be
>> possible
>> to bore the hole at an angle such as this and still get the port
>> timing
>> needed for our application?  This would allow a stepped bore
>> without a gap
>> that needs filling.  The insert could then be a press or slip fit
>> and still
>> have the surface area to eliminate the possibility of leaks.
>>
>> Bryan
>>
>> Yes Bryan but I will not guarantee you will get the same
>> power as the Lemans engine that had a straight in bore more
>> or less. I don't expect it will be very much different however.
>> -- >> Paul Lamar ...No rotor no motor.
>
> The angle make the rest of the intake too high above the engine to
> fit inside most cowls  and also 90º and 180º bends will not work when
> you are constructing the intake.  Jerry
>
> Possibly.
> The BD4 cowl is kind of tall I think. What say you Bob White?
>
> He could cut a 180 degree bend off at the proper angle so the
> upper leg was horizontal. Might be low enough.
>
> Paul Lamar

I tried to do this once.  The result was a major form change where
the runner was cut. Also, after welding, there was some roughness
inside the runner where I over penetrated.  No way to clean it up.
Jerry

It must be cut on a radius line from the geometric center of the
centerline bend curve. Did you do that? In theory that is
still a perfect circle. That should be welded to the
outer 3/16th inch thick plate on the slide throttle. You
should then be able to get in there and smooth it up.

Paul Lamar ...No rotor no motor.

Actually the BD-4 has very little room above the engine when placed at the
designed thrust line.  I was considering the fact the there is a very large
amount of space in the sides of the cowl (42" wide at firewall).  I could
route the intake out to the left then forward into a ram air box plenum.

Waiting with great anticipation for the results on Mark's engine.  Hope he
does get a smoother idle otherwise I will just use a throttle body at the
plenum.  This would be much easier to fabricate and based on the dyno
results with the Weber carb at 24" the performance should not be an issue at
6000-7500 rpm.

Bryan

Sure that would work. Here is an old 3D and pictures.
Like Daves but up higher.

The idle will be worse with a P-port and plenum than with a slide
throttle mounted close to the rotor housing. The reason is bad gases
are stored in those long runners when the throttle is nearly
closed.