0-320 h.p. increase, help wanted

[redrooster]

Nobody mentioned electronic ignition. The guys that have them seem to like them. I'm pretty old-school but it's hard to argue with results. Makes sense that constantly tweaking the timing (instead of fixed timing like a standard mag) would be a good thing, even if it was just advancing the timing along with the rpm. I don't know what all controls the timing on a Lightspeed (or whoever) ignition. One mag & one electronic seems like the best of both worlds.

 

[bob turner]

I am sure nobody has forgotten - I am the Cub pilot who cannot discern any performance increase with the Thrustline change, I am also a pilot who thinks the 160 conversion is a red-hot deal,

So my buddy just traded his high time O-320 for a factory new O-360. I have not flown it much, but my first takeoff I could tell the difference from the moment the throttle was opened right on through the spectacular climbout. Maybe it was a comparison between a 1500 hour engine and a new one, but the old engine had good compression, good accessories, and a Borer prop. The change is simply dramatic! I was not expecting such a change.

 

[Carey Gray]

So, you're saying that the O-360 puts out more power than the O-320.
I'll be damned.

 

[gander]

If your gonna put the money and effort into hott rodding a engine do a 0360 parallel valve. hands down.
The extra weight difference can be made up in lite weight cowling components, my limited experience with both is a hott rodd 0320 gets off only slightly shorter but climbs like a homesick angle and a hott rodded 0360 accelerates a whole lot faster gets off shorter and climbs even better.
Has any one done any ceramic coating to the combustion chamber, piston, exhaust ports?

 

[willyb]

0-320 h.p. increase,help wanted

T.J.

You asked the question
At any given compression ratio, what is the octane rating fuel that is required?

To the best of my knowledge there no set in stone numbers or formulas that will give an absolute octane requirement.
Octane is an anti detonation rating.The factors which can cause an engine to detonate are numerous and vary with engine design and operating conditions.
Mechanical compression ratio is a misleading number.
Cylinder pressure under compression varies greatly with the overall ability of a given engine to fill the cylinders.The more air and fuel it can take in the higher the pressure at Top Dead Center.
Air filter/box,intake design,port layout,rod length,deck height,squish velocity,piston dome configuration,exhaust efficiency,ignition timing,cooling capacity and so much more.
How you load the engine is also a big factor.This is how the factory tests an engine.They put it on a dyno under controlled conditions and and keep increasing the load on it pushing it until it detonates.

Modern auto engines use an anti knock sensor.If the engine starts to detonate it will via the computer back the ignition timing instantaneously to stop it from doing so.When it stops it will put the timing back in.This is one reason that modern cars can obtain good power from poor gas.
They also use manifold pressure and oxygen(rich/lean)sensing.
I believe the Lightspeed ignition uses Manifold pressure sensing to alter the timing curve to load.

By the way if any of you want to get noticeably better gas mileage from your cars go to you auto parts store and get a vacuum gauge or use a manifold pressure gauge.Plumb it into the intake.Now alter your driving to keep the gauge as close to what it is at idle as you can.Fuel mileage will go up,guaranteed.Gas engines only.

Didn't mean to get long winded

Bill