BoB Spitfire 100 Octane fuel

[raaaid]

well the bigger the better is not true check this wiki on octanes:

Octane" is colloquially used as a short form of "octane rating" (named for the ability of octane's branched-chain isomers, especially isooctane, to reduce engine knock), particularly in the expression "high octane". However, components of gasoline other than isomers of octane can also contribute to a high octane rating, while some isomers of octane can lower it, and n-octane itself has a negative octane rating

edit:

for what i know the antiknokcing charachteristic dpened on what kind of engine

so the fuel is syn with engine, normally revolutions

i just learnt it can even be negative

edit:

imagine i fuel creates a flame tongue in 0.1 seconds
the sync so the fuel doesnt expand while the piston contract and knoks depends on the speed of it

the antiknocking chararacthericstics of fuel that is the octanes determines how much does it take to burn

[klem]

Originally Posted by raaaid

well the bigger the better is not true check this wiki on octanes:

Octane" is colloquially used as a short form of "octane rating" (named for the ability of octane's branched-chain isomers, especially isooctane, to reduce engine knock), particularly in the expression "high octane". However, components of gasoline other than isomers of octane can also contribute to a high octane rating, while some isomers of octane can lower it, and n-octane itself has a negative octane rating

edit:

for what i know the antiknokcing charachteristic dpened on what kind of engine

so the fuel is syn with engine, normally revolutions

i just learnt it can even be negative

edit:

imagine i fuel creates a flame tongue in 0.1 seconds
the sync so the fuel doesnt expand while the piston contract and knoks depends on the speed of it

the antiknocking chararacthericstics of fuel that is the octanes determines how much does it take to burn

You're just trying to confuse me aren't you

[335th_GRAthos]

I admit defeat!

[raaaid]

well i understood this in my classes but most of the time i was daydreaming so maybe im mixing things

[Skoshi Tiger]

Good point Raaid.

There is nothing in the 100 Octane fuel that produces extra Horse Power, but it does allows the engine to run in the conditions where the motor can produce more HP. (if that makes sense????)

For example, my valiant with it's 10:1 compression needs 98 octane petrol to run smoothly in all conditions. if I run it on standard unleaded (91 octane) it will ping and knock at even low RPM and is unpleasant to drive at any speed. Using 95 octane I can drive at regular city road conditions, but will get pinging only when I try to flog it!

For true motoring bliss I need the 98 octane fuel to use the entire range of RPM and power in my engine.

AFAICMO, the modifications performed to the Merlin to realise the benefits of 100 octane fuel were in the delivery system to allow the engine to run at the higher boost. The changes to the actual engine were minimal and more for reliability rather than increased power.

Cheers!

[WTE_Galway]

The advantages of the massive stockpile of 100 Octane the British built up before and through the war should not be underestimated.

As an example, the DB605 in Luftwaffe service produced 1450 hp with B4 (87 Octane) and needed Mw50 to achieve more power. The same DB605 running 100 Octane with the Swedish air force produced 1700 hp without needing MW50.

Of course with 100 Octane MW50 would not have have had near as much effect as it is basically an anti-knock agent.