Thanks Steve.
1/8" wall is a bit too heavy for me. 1 mm or 0.04" would be more
to my liking.
Looking at at manifold drawing it looks like I need 33.5 mm
(1.319") ID tubing.
Seems the closest I can get is 1.5" OD with 0.049" wall. 35.6mm
ID.
What I really need is 1-3/8" OD and 0.028" wall but have not been
able to source that.
I might end up just wrapping existing runners with more
fiberglass/epoxy.
Finn
On 12/21/2020 9:11 PM, Stephen Izett
stephen.izett@gmail.com
wrote:
Hi Finn
My notes show (from measurements of hem intake) that
the Renesis 4 port primary and secondary runners are 30mm
diameter.
I used the original secondary runners after cutting
and turning the manifold ~180 degrees.
I used 32mm ID aluminium tube with a 3mm wall
thickness for the Primaries.
Steve Izett
On 22 Dec 2020, at 9:56 am,
Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net>
wrote:
Couldn't understand why it kept "idling" at higher and higher
RPMs (3,500 at the end and had to cut fuel and turn off the
EC3 to shut it down).
I had made the primary runners from the plenum to the intake
ports with 0.016 alum rolled and covered with fiberglass and
epoxy on the outside. Seemed a simple way to go from oval at
the port/manifold to round in the plenum.
Obviously I completely underestimated the amount of vacuum
that the engine can pull or pump. Perhaps if I had added
multiple layers of fiberglass ...
So I need to use thicker tubing or pipe.
Anyone here that can remember the size of tubing they used?
(OD/ID and or thickness)
Finn
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