High Altitude operations (Turbo charge???)

"Morgans" jisumorgan@charterdotjunkdotnet wrote in message
...
snip
Yes, the blower wooould have lost some of its power compared to sea level,
but what I would propose is turbo normalizing, so the increased power is
of
no use at sea level. Of course, it could be used to provide a boost for
take off and such.

Now, for all of the "IF"s !!! Not that many induction systems would
take the added pressure without modification.
resnip

But Jim. . . If the engine is just returned to sea level conditions, where
is the pressure? At your given example of 8000', the manifold pressure would
still be less than atmospheric pressure, would it not?

Rich S.

Rich

Let me try to talk in lay terms (close enough for Government work as
they say) for the great unwashed masses G

1. Engine does not suck mixture into cylinder.
2. Piston comes up on exhaust stroke with exhaust valve open. At top,
exhaust valve closeses and intake valve opens. As piston descends it
creates a volume in the cylinder and ambient air pressure pushes
mixture into cylinder to fill that volume.
3. At sea level the air pressure is 14+ psi and puts 'X' amount of
mixture into cylinder.
4. At 18,000 ft (used because I remember from my Air Force altitude
training) the air pressure is 7.5 psi (half the sea level pressure).
5. With half the amount of mixture pushed into cylinder you get
reduced power out.
6. If you put a mechanical or turbo blower in system you can bring the
amount of (fuel-air) mixture back up to the same amount in cylinder
you get at sea level and will get sea level horse power.

A normally aspirated engine, not designed for a blower, has a higher
compression ratio than a engine designed for a blower. So if you add a
blower (mech or turbo) you are limited to 30 inches of MP (sea level
MP) to maintain engine longevity.

How does this fit in this thread?

No way will a leaf blower provide enough 'boost' to even offset the
weight of installation.

As some posts have said, "been a diverting subject to kick around". If
anyone can make it work they can make a fortune.

Big John
Pilot, ROC Air Force


On Mon, 7 Jul 2003 19:59:53 -0700, "Rich S."
wrote:

"Morgans" jisumorgan@charterdotjunkdotnet wrote in message
...
snip
Yes, the blower wooould have lost some of its power compared to sea level,
but what I would propose is turbo normalizing, so the increased power is
of
no use at sea level. Of course, it could be used to provide a boost for
take off and such.

Now, for all of the "IF"s !!! Not that many induction systems would
take the added pressure without modification.
resnip

But Jim. . . If the engine is just returned to sea level conditions, where
is the pressure? At your given example of 8000', the manifold pressure would
still be less than atmospheric pressure, would it not?

Rich S.

"Big John" wrote in message
...
Rich

Let me try to talk in lay terms (close enough for Government work as
they say) for the great unwashed masses G

snipped cogent explanation of boost

No way will a leaf blower provide enough 'boost' to even offset the
weight of installation.

BJ.......

We are in total agreement. I was saying the same thing - but not as clearly.
{}

Rich S.

"Rich S." wrote in message
...
"Big John" wrote in message
...
Rich

Let me try to talk in lay terms (close enough for Government work as
they say) for the great unwashed masses G

snipped cogent explanation of boost

No way will a leaf blower provide enough 'boost' to even offset the
weight of installation.

BJ.......

We are in total agreement. I was saying the same thing - but not as
clearly.
{}

Rich S.


As was I, if you caught the drift of all my "IF"s. I wish it would work,
but again, there is no free lunch, and not even a reduced price lunch. g
--
Jim in NC

"Rich S." wrote in message
...
"Morgans" jisumorgan@charterdotjunkdotnet wrote in message
...
snip
Yes, the blower wooould have lost some of its power compared to sea
level,
but what I would propose is turbo normalizing, so the increased power is
of
no use at sea level. Of course, it could be used to provide a boost for
take off and such.

Now, for all of the "IF"s !!! Not that many induction systems
would
take the added pressure without modification.
resnip

But Jim. . . If the engine is just returned to sea level conditions, where
is the pressure? At your given example of 8000', the manifold pressure
would
still be less than atmospheric pressure, would it not?

Rich S.


I don't see what you don't see.

If there is an effective boost on the engine, the manifold pressure at WOT
will be the same at 8,000 ft as it is at sea level at WOT. An engine at
cruise at sea level will usually run a couple inches less than atmospheric
pressure. A normalized engine would run that same number at altitude, vs.
an un-normalized engine running the atmospheric pressure at that altitude
minus a couple inches pressure.

What was it we were discussing? g
--
Jim in NC