REFLECTOR: Exhaust systems

[Jim Agnew]

Careful Brian that 220 HP is at 3200 RPM and the data plate
says 205HP at 2800 RPM so it is close to the lycoming 200
IO-360 given the tuned intakes & FI with a lower
compression ratio.

Jim
--- Brian Michalk <michalk@awpi.com> 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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=====
James F. Agnew
Jim_Agnew_2@Yahoo.Com
Tampa, FL
Velocity 173 Elite Aircraft Completed