Today's Message Index:
----------------------
1. 05:06 AM - Rotax 582 (CFrank@edony.com)
2. 06:00 AM - Re: owner produced parts camshaft (CardinalNSB@aol.com)
3. 06:24 AM - Re: Re: owner produced parts-camshaft? (Archie)
Message 1
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--> Engines-List message posted by: CFrank@edony.com
Are there any Rotax 582 users within this group? Thanx!
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<span style'font-size:10.0pt;
font-family:Arial'>Are there any Rotax 582 users within this group? Thanx!
Message 2
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| Subject: | Re: owner produced parts camshaft |
--> Engines-List message posted by: CardinalNSB@aol.com
I had been investigating the Powerflow (tuned header exhaust, stc'd) use on
a certified Cessna. The reading on the user groups indicated that the
results on the 0-360 were not as impressive as on the 0-320.
I spoke to an engineer at Powerflow who relayed that cam issues were more
influential on the 360 than the 320, that factory tolerances were pretty wide
and a lopsided one won't give the best scavenging effect. I plan to talk to
them some more as I get close to my rebuild, but I wanted to get as much info
on my own beforehand.
So, my thoughts were to find the Lycoming specs and tolerances and discuss
with the engineer "where" in the tolerance the cam should be.
From my youth I know that advance/retard/lobe separation/ramp profile all
can have quite an effect on power, even if the "lift" is the same.
From my reading on owner produced parts, I believe I can legally spec a cam
and so long as it is within Lycoming's tolerances it will be legal.
......airboat,....of course.....
how do I find out what Lycoming's tolerances are? thanks again, skip simpson
Message 3
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| Subject: | Re: owner produced parts-camshaft? |
--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
Not enough info.
Need acceleration/deceleration ramp info,
lobe separation, etc.
I no longer have a cam grinder, and have no access to
blank shafts. Usually send
that out to a couple of racing cam people.
(who shall remain nameless)
If this is to be used at high altitudes, a bit more
intake lift will help.
If it is a certificated engine, and you are concerned
about authenticity, a few of the AC grinders may
be able to help.
==================================
----- Original Message -----
From: "Danny Lawhon" <dlawhon@yahoo.com>
Subject: Re: Engines-List: Re: owner produced parts-camshaft?
> --> Engines-List message posted by: Danny Lawhon <dlawhon@yahoo.com>
>
> Archie, I have some old cam spec's that I would like
> to have ground, Its an old stock grind of lycoming but
>
> they don't make any more.. these are the spec's
>
> Base Circle diameter. Intake lobes 1.188
> Base Circle Diameter Exhaust lobes 1.171
> Max Lift all lobes Intake 352 Exhaust .355
> Main Brg Dia 1.0265
> max runout on mains .0005
>
> how hard would that be to make , and can you
> make one ?
>
> Danny...
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