pcondon(at)mitre.org
Guest
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 Posted: Wed May 17, 2006 9:56 am Post subject: Ryton sumps Ryton sumps Another fix or Solution |
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I made a forward facing sump out of a Lycoming magnesium casting from a
B1A sump. The Normal B1A sump has a rearward machined injector mount
and also has a rough cast area in the front that can be machined flat
and the studs mounted to mount a front injector. I spent 90 dollars at
a machine shop in my little 'berg where I live to machine the front
rough cast flat and thread the studs. I cut a plate from 1/4 inch
aluminum stock to make a plate for the rear hole. Works fine and when
you eye-ball the sump you can see where the cast areas are identical in
the front or rear. This is not a TSO/FAA/PMA/STC'ed mod, but as
experimental, works great. The magnesium is light too. Not the cold air
thing, but at least not subject to breakage either.
I have a spare, untouched sump (as described); When I looked into this
a few years ago. One salvage yard sent me one a few months after I
contacted them...... then they didn't have one initially. Wires got
crossed and the sent me one (with a bill for 750$). So, I wound up with
two, modified the one now on my airplane--hence the spare in the
garage. Maybe this is a solution for the Ryton folks........
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I've been on the phone all day researching this topic. Thanks for =
pointing me in the right direction Gary.
Here's the deal:
If you want a "cold air sump", there seems to be 3 choices-
Ryton sump by Superior
Magnesium sump by ECI
Barrett Precision cold air sump
All the other metal sumps out there-
Aerosport Power
Aero Engines
Superflite
Are all copies of the Lycoming cast aluminum sump (not cold air sumps)
The Ryton sump (by Superior Engines) we've discussed before here, it =
costs 1000 to 1300 dollars and will break when used with a wasted spark
=
electronic ignition system...if not sooner, then later. You might not
=
know it's broken unless you inspect it closely like I did. Superior =
does not see the magnitude of the problem of the sumps it has in the =
field, but is currently in a "redesign" of the Ryton sump to address
the =
wasted spark ignition issue. The new sump is expected out by October.
=
Based on other new product announcements, I wouldn't look for it a day
=
sooner.
......................................................................
...
The magnesium sump by ECI is just now becoming available and costs
about =
$2400 including the tubes. There are two of them out there on aircraft
=
so far. If you want to be #3, they should be ready to ship on May 22.
=
I was told I'd have to fab a support bracket for the Bendix or AFP
servo =
because that was "too much weight" out there for the induction portion
=
of the sump to hold unsupported. That bothered me. The flange for =
mounting the fuel servo is also forward from where the Ryton sump
flange =
is, which will mean more extensive alteration of the air snorkel to get
=
it to fit.
I don't have the information on the Barrett Cold Sump system, but it is
=
the most expensive of the three. I'll post that here when I find it.
I guess that's it...
My choice will be the Superflight sump, when it's available in a few =
weeks. It's a clone of the Lycoming forward facing sump, so it's not a
=
"cold air sump". I have made peace with that and decided if I get a =
sump that WON'T BREAK, that will be more important than a few more =
horsepower. All these clones of the Lycoming forward facing sump are =
priced about the same at $2200.
I sure think there's a market out there for a well made cold air =
induction system...but I don't think there's a good one at a reasonable
=
price that's available yet.
For those of you who are running Ryton sumps, I encourage you to
inspect =
them very closely and very regularly. Like every time you fly. Two of
=
these sumps that have broken here have actually broken into pieces that
=
fell out onto the ground below the aircraft. The others have just =
cracked. In the case of my sump, the engine still ran fine with the =
cracked sump. Had we had the engine cowled, I would have had no reason
=
to uncowl it to inspect it before going flying. Had the lower part of
=
the sump (where the fuel servo mounts) broken off in flight, I am sure
=
it would have ruined my day.
bob
rv7a
last few things plus a new induction system
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