GO480

When I read about Lycoming engines the terms "wide deck", "narrow deck",
"straight valve" and angle valve are used to describe different
cylinder/case configurations. What is the GO480 in my Helio Courier?
Narrow deck? Wide deck? Angle valve? Straight valve?

Thanks

Mike
MU-2

Mike Rapoport wrote:
When I read about Lycoming engines the terms "wide deck", "narrow deck",
"straight valve" and angle valve are used to describe different
cylinder/case configurations. What is the GO480 in my Helio Courier?
Narrow deck? Wide deck? Angle valve? Straight valve?

The deck refers to the flange where the cylinder meets the case.
The valves straight/angle indicate whether the two rockers are
parallel to each other or form a sort of V). I don't know about
the deck, but I think the Gopher's were all angle-valve. The
wide deck engine serial numbers end in "A".

Intresting information about all this can be obtained at
www.sacskyranch.com.

My condolences on having the gopher80. Getting rid of mine
was a big improvement on the Navion.

-Ron

Margy wrote:

My condolences on having the gopher80. Getting rid of mine
was a big improvement on the Navion.

Yeah, but it took you nearly two years, didn't it?

George Patterson
Why do men's hearts beat faster, knees get weak, throats become dry,
and they think irrationally when a woman wears leather clothing?
Because she smells like a new truck.

George Patterson wrote:
Margy wrote:


My condolences on having the gopher80. Getting rid of mine
was a big improvement on the Navion.


Yeah, but it took you nearly two years, didn't it?

George Patterson
Why do men's hearts beat faster, knees get weak, throats become dry,
and they think irrationally when a woman wears leather clothing?
Because she smells like a new truck.
More than that, but we got into a bad case of the "might as wells"

Margy

If you look at the cylinder bases you can tell if it is a wide or narrow
deck.
Narrow deck engines use interior hex nuts and possibly hold down plates to
hold the cylinder to the case. Wide deck engines have studs, regular hex
nuts, and thicker cylinder flanges holding the cylinders to the case.
Wide deck engines serial numbers end in "A", narrow deck engines serial
numbers do not.
Narrow deck engines are typically older, mid-60's and earlier.

I believe that
http://www.lycoming.textron.com/supp...ns/SI1037M.pdf

shows your cylinder Assembly number to contain an "r" indicating angle
valves (not parallel) and an "e" indicating needing long reach spark plugs.

Jim


"Mike Rapoport" wrote in message
ink.net...
When I read about Lycoming engines the terms "wide deck", "narrow deck",
"straight valve" and angle valve are used to describe different
cylinder/case configurations. What is the GO480 in my Helio Courier?
Narrow deck? Wide deck? Angle valve? Straight valve?

Thanks

Mike
MU-2

"Margy" wrote in message
...
Mike Rapoport wrote:
When I read about Lycoming engines the terms "wide deck", "narrow deck",
"straight valve" and angle valve are used to describe different
cylinder/case configurations. What is the GO480 in my Helio Courier?
Narrow deck? Wide deck? Angle valve? Straight valve?

The deck refers to the flange where the cylinder meets the case.
The valves straight/angle indicate whether the two rockers are
parallel to each other or form a sort of V). I don't know about
the deck, but I think the Gopher's were all angle-valve. The
wide deck engine serial numbers end in "A".

Intresting information about all this can be obtained at
www.sacskyranch.com.

My condolences on having the gopher80. Getting rid of mine
was a big improvement on the Navion.

-Ron

What was the problem with the GO480? In the Helio, it is considered much
better than the TIO540 or the IO720.

Mike
MU-2

Thanks Jim! I will have a look today.

Mike
MU-2

"Jim Burns" wrote in message
...
If you look at the cylinder bases you can tell if it is a wide or narrow
deck.
Narrow deck engines use interior hex nuts and possibly hold down plates to
hold the cylinder to the case. Wide deck engines have studs, regular hex
nuts, and thicker cylinder flanges holding the cylinders to the case.
Wide deck engines serial numbers end in "A", narrow deck engines serial
numbers do not.
Narrow deck engines are typically older, mid-60's and earlier.

I believe that
http://www.lycoming.textron.com/supp...ns/SI1037M.pdf

shows your cylinder Assembly number to contain an "r" indicating angle
valves (not parallel) and an "e" indicating needing long reach spark
plugs.

Jim


"Mike Rapoport" wrote in message
ink.net...
When I read about Lycoming engines the terms "wide deck", "narrow deck",
"straight valve" and angle valve are used to describe different
cylinder/case configurations. What is the GO480 in my Helio Courier?
Narrow deck? Wide deck? Angle valve? Straight valve?

Thanks

Mike
MU-2

In article ,
"Jim Burns" wrote:

If you look at the cylinder bases you can tell if it is a wide or narrow
deck.
Narrow deck engines use interior hex nuts and possibly hold down plates to
hold the cylinder to the case. Wide deck engines have studs, regular hex
nuts, and thicker cylinder flanges holding the cylinders to the case.
Wide deck engines serial numbers end in "A", narrow deck engines serial
numbers do not.
Narrow deck engines are typically older, mid-60's and earlier.

I believe that
http://www.lycoming.textron.com/supp...Publications/s
erviceInstructions/SI1037M.pdf

shows your cylinder Assembly number to contain an "r" indicating angle
valves (not parallel) and an "e" indicating needing long reach spark plugs.

Jim


"Mike Rapoport" wrote in message
ink.net...
When I read about Lycoming engines the terms "wide deck", "narrow deck",
"straight valve" and angle valve are used to describe different
cylinder/case configurations. What is the GO480 in my Helio Courier?
Narrow deck? Wide deck? Angle valve? Straight valve?

Parallel-valve Lycomings have rocker covers that have parallel sides; on
angle-valve Lycomings, the sides of the rocker covers angle toward an
apex somewhere above the cylinder.

I lost a friend last year when his GO-480 threw a rod in his Pilatus
P-3. He hit a tree attempting to make an emergency landing.

--
Remove _'s from email address to talk to me.

Mike Rapoport wrote:


What was the problem with the GO480? In the Helio, it is considered much
better than the TIO540 or the IO720.


The thing is obsolete. Lycoming practically denies having made it (they
do deny having made the Gopher35). The TBO and Overhaul costs will kill
you. The accessories are unobtainable in many cases.

Mike,

Just a few questions and thoughts, mainly because I'm curious.

I'd be interested to know the HP rating of the GO480 installed in the Helio.
I've been watching a few people that are building Bearhawks and one article
mentions that the GO480 isn't favored for that application for the relative
high weight to HP ratio compared to the 540.

I "believe" that the Beech Queen Air originally used a version of the 480
and I "know" a lot of them have been retrofitted with either 720's or
turbines. Whether this was due to high rebuild or maintenance costs or lack
of power, I have no idea.

Would the desirability of the 480 in the Helio be due to a desire to keep
them "original"?

Jim


"Mike Rapoport" wrote in message
ink.net...

"Margy" wrote in message
...
Mike Rapoport wrote:
When I read about Lycoming engines the terms "wide deck", "narrow
deck",
"straight valve" and angle valve are used to describe different
cylinder/case configurations. What is the GO480 in my Helio Courier?
Narrow deck? Wide deck? Angle valve? Straight valve?

The deck refers to the flange where the cylinder meets the case.
The valves straight/angle indicate whether the two rockers are
parallel to each other or form a sort of V). I don't know about
the deck, but I think the Gopher's were all angle-valve. The
wide deck engine serial numbers end in "A".

Intresting information about all this can be obtained at
www.sacskyranch.com.

My condolences on having the gopher80. Getting rid of mine
was a big improvement on the Navion.

-Ron

What was the problem with the GO480? In the Helio, it is considered much
better than the TIO540 or the IO720.

Mike
MU-2