REFLECTOR: Exhaust systems

[Scott Derrick]

Well, my IO360 is 200HP, so not much difference there.

I think there's something fishy in Denmark about this A&P's remark.

We are also not talking about cruise RPM's but takeoff rpms, which are 
considerably lower.

Any way you cut it, a specific air-fuel mix at a certain pressure burns 
at a certain temperature. I don't care if its in a magic Franklin or not.

Scott

There's No Such Thing As A Free Lunch!

Brian Michalk wrote:
> Franklin engines are 10.5:1 compression ratio with 350 cubic inches, and are
> rated at 220 horsepower, normally aspirated.  Compare this to a Lycoming
> 0-360 rated at 180 horsepower.  More heat(energy) goes into the work.
> The second thing that could cause low EGT is the very high valve overlap.
> There is a lot of scavenging going on in a Franklin cylinder, causing
> volumetric efficiencies of 103% at the cruise RPMS.
> 
> 
>>-----Original Message-----
>>From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
>>Behalf Of Scott Derrick
>>Sent: Tuesday, July 15, 2003 11:09 AM
>>To: reflector@tvbf.org
>>Subject: Re: REFLECTOR: Exhaust systems
>>
>>
>>This sounds very odd.  I think av gas in a near optimal
>>mixture(Stociometric?) burns at 1500+ F. It doesn't matter whether its
>>in your Honda Civic, your lawn mower or aircraft engine.
>>
>>Maybe its the placement of the EGT probe.  The absolute temp is really
>>of not much concern because where you stick the probe in and how the
>>exhaust flows in the pipe will effect the probe temperature quite bit.
>>Its the trend that is of prime importance.
>>
>>Scott
>>
>>John Dibble wrote:
>>
>>>I just spoke with an A/P that works on Franklin engines.  He
>>
>>says I should not expect
>>
>>>my EGT to exceed 1000 F.  Franklin engines run cooler.
>>>
>>>John
>>>
>>>steve korney wrote:
>>>
>>>
>>>
>>>>John...
>>>>
>>>>In that case your running way to rich...You should see temps of
>>>
>>about 1250
>>
>>>>to 1300 (f) on take-off...
>>>>Maybe that's the reason it stumbles so much on run-up...Lean it
>>>
>>out...Keep
>>
>>>>the temps above 1150 on the ground or you won't vaporize the lead in the
>>>>fuel and it will foul your plugs...
>>>>
>>>>Best... Steve
>>>>
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> 
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