Do GSXR's like Av Gas??

[Zapf]

Av gas burns slower hence lower pressure from the burn. lower pressure = less power...

so run the lowest octane that is suitable for your engine...

question is, how do u know if ur engine is knocking....

[Wenier]

You'd usually hear it.

Pressure should be the same thou as the fuel injection is still going to pump say 1 part fuel (wut eva the octane) to 14 parts air. That probably isnt the ratio for bikes but i cant remember. If you change the ratio it will burn slower. This would then give you less power as the time when it is all burnt and has the greatest pressure to act on the piston is after the Most effective crank angle. But if the ratio is the same the burn speed should still be 100ft per sec and it should still have the same amount of pressure at the correct time.

If it were slower i should have felt a difference in my bike when i did it which it didnt. Infact the bike seemed to run with no change in performance.

[bugjuice]

Av gas burns slower hence lower pressure from the burn. lower pressure = less power...

so run the lowest octane that is suitable for your engine...

question is, how do u know if ur engine is knocking....

I thought the idea was to run a higher octane to get the hotter burn which would produce the better power?
What would the point of running AvGas in race cars etc be if it produced less power?

as for the knocking, you hear a metal 'tinging' sound, or a knocking, like something is loose, but it isn't..

[Wenier]

I thought the idea was to run a higher octane to get the hotter burn which would produce the better power?
What would the point of running AvGas in race cars etc be if it produced less power?

as for the knocking, you hear a metal 'tinging' sound, or a knocking, like something is loose, but it isn't..

Thats exactly the same idea and im sure it burns the same or faster. Also Av-gas has TEL (ethylene Dibromide) mixed with the fuel to get rid of lead residue by combining TEL with the Lead to form Lead Bromides (these are volatile) which can be sucked out with exhaust gases instead of forming solids so that could bring down the chance of fouling the O2 sensor.

[Wenier]

shit almost forgot. 110/130 runs at 110 when your engine management computer is running the engine lean, or 130 when it is running it rich.

[Ixion]

I thought the idea was to run a higher octane to get the hotter burn which would produce the better power?
What would the point of running AvGas in race cars etc be if it produced less power?

as for the knocking, you hear a metal 'tinging' sound, or a knocking, like something is loose, but it isn't..

Slower burn means you can up your compression ratio without detonation. Or use a higher turbo boost pressure . Same deal as alcohol basically, the fuel itself doesn't give any more power, but means you can tune the engine higher without it self destructing. (alcohol's a bit different though because it has it's own oxy supply)

[bugjuice]

Slower burn means you can up your compression ratio without detonation. Or use a higher turbo boost pressure . Same deal as alcohol basically, the fuel itself doesn't give any more power, but means you can tune the engine higher without it self destructing. (alcohol's a bit different though because it has it's own oxy supply)

ahhhh.. explains a bit..
Alky would be different anyway - too many riders would be going around with a straw in the tank..

[Zapf]

ok... guess like some people know more than I

but from my experience from a 2.5L hi compression turbo motor, is that stock engines can't really benfit much from running av gas. to really benfit from av gas, engine (head / piston) modifications are usually required.

Engine management can't benfit much either, except some ign timing.

[Ixion]

ok... guess like some people know more than I

but from my experience from a 2.5L hi compression turbo motor, is that stock engines can't really benfit much from running av gas. to really benfit from av gas, engine (head / piston) modifications are usually required.

Engine management can't benfit much either, except some ign timing.

Yes. Though the other way round really. To use hairy levels of head/piston mods or silly boost pressures, you need to use avgas or it all goes bang tinkle. If you're on stock top end, avgas won't give any advantage . May even reduce power as someone said below.

[Rod Steel]

So then if this is all correct that means my dad is lying? when he claimed that he used to get upto 140km/ph on his honda 100 when he was in his teens? He did also claim he blew the head gasket and put holes in the piston reguarly(sp?)...

[MSTRS:Me]

So then if this is all correct that means my dad is lying? when he claimed that he used to get upto 140km/ph on his honda 100 when he was in his teens? He did also claim he blew the head gasket and put holes in the piston reguarly(sp?)...

Honda 100's were faster in the olden days cos the fuel was fresher back then

[oldfart]

well all I can say to all this very erudite & knowledgable information is "Bah Humbug". You guys could fertilise a nation. All I know is when I ran my old Kwaka Z1, (1973), on AV gas, it went noticeably faster, ran cleaner etc etc. Not sure how modern motors appreaciate leaded fuel but.

[Sensei]

Ran 30% avgas in my GSXR1100R WP at the drags and would do 10.20 1/4's .
Without Avgas 10.70 sec 1/4's
SENSEI

[Ixion]

So then if this is all correct that means my dad is lying? when he claimed that he used to get upto 140km/ph on his honda 100 when he was in his teens? He did also claim he blew the head gasket and put holes in the piston reguarly(sp?)...

Well at 140 it would be way way way over the redline. But those Honda speedos were the biggest fairy tale tellers since the Messrs Grimm. So I would maybe believe a true 110-120, downhill , indicated as "needle swinging wildly back and forth off the end of the speedo scale so maybe that's 140kph"

I used to see 130 on my 125. Downhill, tail wind tacho in the red, me in the tank. Bent a valve, but nothing worse,

Got a Beezer Bantam up to 65mph too, bu that was highly hacked about

[Wenier]

It definitely gives more power rather than less, if ya get less theres gotta be something wrong.