Today's Message Index:
----------------------
1. 11:10 AM - New Member (Richard & Martha Neilsen)
2. 03:20 PM - Re: New Member (Tedd McHenry)
3. 06:07 PM - Re: New Member (Richard & Martha Neilsen)
4. 09:50 PM - Crossover exhaust (DEAN PSIROPOULOS)
5. 10:21 PM - Re: Crossover exhaust (Red Hamilton)
Message 1
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--> Engines-List message posted by: "Richard & Martha Neilsen" <NeilsenRM05@comcast.net>
Hey all
I'm a new member of the engines list. I have been a long term member of the Kolb
list. I have a redrive VW powered Kolb MKIIIc. The engine is basically a 2180
cc dunebuggy engine with a Valley reduction drive and a three bladed 72" Power
Fin Model F. When I originally flew my Kolb I had a 2180cc Great Plains direct
drive engine on it. The original engine didn't have enough thrust for my plane
to fly it with a passenger. Since switching to a redrive VW I have enjoyed
a much better climb, faster cruise, lower engine temps, lower fuel consumption,
and yes it is now a two passenger airplane. The only down side is a bit more
vibration.
Rick Neilsen
Redrive VW powered MKIIIc
Message 2
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--> Engines-List message posted by: Tedd McHenry <tedd@vansairforce.org>
Rick:
> Since switching to a redrive VW I have enjoyed a much better climb, faster
> cruise, lower engine temps, lower fuel consumption, and yes it is now a two
> passenger airplane.
Interesting that you have lower temperatures. One criticism I've heard
expressed about redrive VWs is that they can put out more heat than the
cylinder heads can cool. Are you able to climb at a higher speed, and is that
contributing to the lower temperatures?
Tedd McHenry
Surrey, BC
Message 3
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--> Engines-List message posted by: "Richard & Martha Neilsen" <NeilsenRM05@comcast.net>
Ted
I do climb at higher speeds but the real reason for my lower temps is that
the engine is running at a lower power level at cruise yet I cruise at a
speed 10 MPH faster. I have some good cooling scoops which keeps things
cool. The CHTs are never above 300 degrees cruise at app 60% power, the
direct drive engine was running 80% power 10MPH slower. These differences
are all at the same 3200 RPMs for both redrive and direct. The engine is
running in a pusher configuration so I do have to watch the temps on the
ground.
Rick Neilsen
Redrive VW powered Kolb MKIIIc
----- Original Message -----
From: "Tedd McHenry" <tedd@vansairforce.org>
Subject: Re: Engines-List: New Member
> --> Engines-List message posted by: Tedd McHenry <tedd@vansairforce.org>
>
> Rick:
>
>> Since switching to a redrive VW I have enjoyed a much better climb,
>> faster
>> cruise, lower engine temps, lower fuel consumption, and yes it is now a
>> two
>> passenger airplane.
>
> Interesting that you have lower temperatures. One criticism I've heard
> expressed about redrive VWs is that they can put out more heat than the
> cylinder heads can cool. Are you able to climb at a higher speed, and is
> that
> contributing to the lower temperatures?
>
> Tedd McHenry
> Surrey, BC
>
>
>
Message 4
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| Subject: | Crossover exhaust |
--> Engines-List message posted by: "DEAN PSIROPOULOS" <dean.psiropoulos@verizon.net>
Question on exhaust:
Parallel valve Lycoming 4 cylinder engine. Is there a reason the front two
pipes have to cross over before they go out the cowling? Everyone says that
Lycomings have to have an oil cooler because the oil runs hot. Gee I wonder
why...two hot exhaust pipes run right past the front of the oil sump and
dump gobs of heat into the oil (in addition to the rear cylinders heating up
the sides of the sump)!!! So why not trash this exhaust pipe configuration
(the crossover) and go to a simple 2 into 1 set up on each side of the
engine? Just bring the two pipes together off the same side and dump it out
the cowling without crossing over in front of the oil pan. A fellow
Lancair 360 builder (who also used to work on race boats for a living) built
his own exhaust like this from Aircraft Spruce parts. Airplane isn't flying
yet but I certainly see his logic in doing it. Another fellow Q200 builder
did the same thing with his 0-200 Continental engine and says there has been
a noticeable difference in under-cowl temps. I can't believe this hasn't
come up before, anybody know the answer? Is there a good reason the exhaust
has to crossover? What wives-tail or urban legend says the exhaust has to
crossover?
Dean Psiropoulos
RV-6A N197DM
Installing exhaust
Message 5
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| Subject: | Re: Crossover exhaust |
--> Engines-List message posted by: "Red Hamilton" <redswing@mcn.org>
It doesn't have to cross over, the reason that it usually does is to make the firing
impulses in each outlet (if two) 360* apart. If you run a tube on each bank,
the impulses are 180/540etc in each outlet, again assuming two outlets.
You can use metallic ceramic coatings and baffles to help contain heat, you could
run a four outlet system or a 4into1 if you would sooner, Each has advantages
and dis.
Red
----- Original Message -----
From: DEAN PSIROPOULOS
To: engines-list@matronics.com
Sent: Saturday, November 19, 2005 9:49 PM
Subject: Engines-List: Crossover exhaust
--> Engines-List message posted by: "DEAN PSIROPOULOS" <dean.psiropoulos@verizon.net>
Question on exhaust:
Parallel valve Lycoming 4 cylinder engine. Is there a reason the front two
pipes have to cross over before they go out the cowling? Everyone says that
Lycomings have to have an oil cooler because the oil runs hot. Gee I wonder
why...two hot exhaust pipes run right past the front of the oil sump and
dump gobs of heat into the oil (in addition to the rear cylinders heating up
the sides of the sump)!!! So why not trash this exhaust pipe configuration
(the crossover) and go to a simple 2 into 1 set up on each side of the
engine? Just bring the two pipes together off the same side and dump it out
the cowling without crossing over in front of the oil pan. A fellow
Lancair 360 builder (who also used to work on race boats for a living) built
his own exhaust like this from Aircraft Spruce parts. Airplane isn't flying
yet but I certainly see his logic in doing it. Another fellow Q200 builder
did the same thing with his 0-200 Continental engine and says there has been
a noticeable difference in under-cowl temps. I can't believe this hasn't
come up before, anybody know the answer? Is there a good reason the exhaust
has to crossover? What wives-tail or urban legend says the exhaust has to
crossover?
Dean Psiropoulos
RV-6A N197DM
Installing exhaust
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