Corvair conversion engines

In article , "Peter Dohm" wrote:

At this point, the Jabiru 3300 is the only engine that really looks to me
like a promising replacement; and I really don't know its service record.
However, albeit at a higher dollar price, its features seem to preserve: 1)
similar or lighter weight, 2) similar or higher power, 3) six cylinder
smoothness, 4) reasonably slow idle, and 5) similar dimmensions. Additional
benefits are designed in dual ignition and an updraft intake system, similar
to Lycoming and Continental, which should be more resistant to ice.

Peter


Why would an updraft intake system be more resistant to ice?

Heat rises, so I would expect a downdraft system, mounted above the engine
block, to be more resistant to icing.

"who cares?" wrote in message
news:54xBf.560$AV.519@trnddc07...


Why would an updraft intake system be more resistant to ice?

Heat rises, so I would expect a downdraft system, mounted above the engine
block, to be more resistant to icing.

"Typically" cooling air comes in above the engine, flows down between the
cylinders, then out the bottom. This makes it colder up top, and warmer
below. There are, of course, exceptions.

--
Geoffrey Thorpe
The Sea Hawk At WowWay D0t Com

"Capt. Geoffrey Thorpe" The Sea Hawk at wowway d0t com wrote:
Why would an updraft intake system be more resistant to ice?

Heat rises, so I would expect a downdraft system, mounted above the
engine block, to be more resistant to icing.

"Typically" cooling air comes in above the engine, flows down between the
cylinders, then out the bottom. This makes it colder up top, and warmer
below. There are, of course, exceptions.

This has been one of the most friendly informative threads yet on this
newsgroup, How refreshing!
John

On Tue, 24 Jan 2006 16:22:45 -0500, "Peter Dohm"
wrote:


"Rich S." wrote in message
...
"Peter Dohm" wrote in message
news
---------much snipped-----------


These were also 40 year old cranks of unknown provenence, pulled out
of old car engines that may have been thrashed to within an inch of
their lives in previous "inCARnations"

This has been my area of concern as well. I would really find these
engines more attractive if I was confident that a complete new engine
could
be built.

New engines don't have crankshaft problems?

BWAHAHAHAHAHAHA!!!

Rich S.

Yes. I know that they do, and new design engines are notorious; as are
design improvements, changes of supplier, etc. And they include plenty of
reasons for loss of power not caused by the crankshaft!

However, my concerns include, reliability, maintainability, and eventual
replacement; and I think you understand my point.

At this point, the Jabiru 3300 is the only engine that really looks to me
like a promising replacement; and I really don't know its service record.
However, albeit at a higher dollar price, its features seem to preserve: 1)
similar or lighter weight, 2) similar or higher power, 3) six cylinder
smoothness, 4) reasonably slow idle, and 5) similar dimmensions. Additional
benefits are designed in dual ignition and an updraft intake system, similar
to Lycoming and Continental, which should be more resistant to ice.

Peter

By what reasoning? Virtually all carbureted aero engines are
sucseptible to carb ice - doesn't matter where the carb is.

clare at snyder.on.ca wrote in message
...
On Tue, 24 Jan 2006 16:22:45 -0500, "Peter Dohm"
wrote:


"Rich S." wrote in message
...
"Peter Dohm" wrote in message
news ---------much snipped-----------


These were also 40 year old cranks of unknown provenence, pulled out
of old car engines that may have been thrashed to within an inch of
their lives in previous "inCARnations"

This has been my area of concern as well. I would really find these
engines more attractive if I was confident that a complete new engine
could
be built.

New engines don't have crankshaft problems?

BWAHAHAHAHAHAHA!!!

Rich S.

Yes. I know that they do, and new design engines are notorious; as are
design improvements, changes of supplier, etc. And they include plenty
of
reasons for loss of power not caused by the crankshaft!

However, my concerns include, reliability, maintainability, and eventual
replacement; and I think you understand my point.

At this point, the Jabiru 3300 is the only engine that really looks to me
like a promising replacement; and I really don't know its service record.
However, albeit at a higher dollar price, its features seem to preserve:
1)
similar or lighter weight, 2) similar or higher power, 3) six cylinder
smoothness, 4) reasonably slow idle, and 5) similar dimmensions.
Additional
benefits are designed in dual ignition and an updraft intake system,
similar
to Lycoming and Continental, which should be more resistant to ice.

Peter

By what reasoning? Virtually all carbureted aero engines are
sucseptible to carb ice - doesn't matter where the carb is.

As another poster also pointed out, my memory was faulty and it is easy to
form ice in the O-200, even though the carburetor appears to be in the path
of heated cooling air from the cylinders.

Peter