REFLECTOR: Props ...

[michalk]

/egging on mode on
Skip the re-timing.
Add water injection, to be triggered off manifold pressure, or go really 
high tech and do ionic sensing for detonation.  You'll love the 
increased efficiency or horsepower.
/egging on mode off

I wonder how long it would take for cracks to show up on the cylinders 
if one runs at these high BMEP pressures on large, hot, 
lightweight(thin) aluminum cylinders.

Motorcycles get away with it.  They run much higher BMEP, but they are 
small volume, thick cylinder walls.

Just go diesel.  Problem solved.

Of course the Franklin is 10.5:1 compression for 350 cubic inches.  But 
it's a six cylinder to the Lyc's four, so the cylinder diameters are 
smaller resulting in lower stresses.

Many nice things happen as you increase the number of cylinders relative 
to engine swept volume.  Exhaust valves are cooler, cylinder temps are 
lower, pressures are lower peak forces are lower, vibration is lower, etc.

I bet if one did not have to retard timing on the 360, you could get 230 
to 240 horsepower.

HYTEC45 at aol.com wrote:
> Defiantly overproped, however, once you address that issue, look into 
> 10-1 pistons.  This gave me an additional 50 rpm static with my 
> /Performance/ prop.  The IO360s have the larger crank journals compared 
> to the 320s, and can take it fine.  You will have to cut back the timing 
> from 25 to 20 BTDC.
>  
> TEC
> 
> 
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