[Ironhorse]

Where I live I can't seem to find anything higher than 88 or 89 octane.So should I add something to the fuel to make it higher?would this help or be benificial in any way?friend on mine said I could run purple but wasn't really sure what octane it is...and if it would hurt my engine.what would you guys do?

 

[smo0oth1]

You would be wasting your money running anything more than 89 on a stock bike. You will not make any more power with additives.

 

[phucknutz]

I don't believe in additives, what is your bike doing on the 89? any knocking? if not you are ok, if it is I would recommend buying some race fuel in 5 gallon cans, pour 1 gallon in a 5 gallon can and add 4 gallons of 89. You will be fine. 89x4=356+110=466/5=93 good to go. so 5 gallons of race gas will yeald 25 gallons of 93!

 

[Ironhorse]

You would be wasting your money running anything more than 89 on a stock bike. You will not make any more power with additives.

Thanks...what about this purple race fuel?

 

[Nasty700xx]

I agree, I used 89 for the longest time but it was knocking as soon as I went to 93 it stopped and seemed to run a little better. There will be no big improvement but I did stop the knocking that way. That was on a complete stock bike with only a slip on.

 

[Ironhorse]

I don't believe in additives, what is your bike doing on the 89? any knocking? if not you are ok, if it is I would recommend buying some race fuel in 5 gallon cans, pour 1 gallon in a 5 gallon can and add 4 gallons of 89. You will be fine. 89x4=356+110=466/5=93 good to go. so 5 gallons of race gas will yeald 25 gallons of 93!

Seems to be knocking or tapping sound coming from somewhere but seems not to do it when I give it a little gas...maybe normal but not sure.do know any thing about this purple gas my friend was talking about.

 

[Nasty700xx]

Its prob 110. Is it VP racing fuel?

 

[scuzz]

This totally isn't the thread I thought it was.

 

[Ironhorse]

So mix the purple stuff one gallon to four gallons of 89?

 

[Nasty700xx]

That would give you a better blend and you can see if the knock goes away for ya.

 

[Ironhorse]

Just noticed what phucknutz was saying....thanks for the info guys! This iPhone is slow

 

[roadkill]

Octane and compression ratio are related. The higher the compression ratio, the higher the octane needs to be to be stable under compression. Lower octane fuels will pre-detonate under higher compression and cause what we hear as knock. However, an engine that is designed for lower octane fuels (lower compression ratio) will NOT run any better using a fuel of higher octane... just a waste of money for no benefit.

roadkill

 

[phucknutz]

if you are knocking like us said, i know mine did, mix 1 gal purple race gas to 4 gal. race fuel

 

[Ironhorse]

Found the purple stuff..think they said it was VP purple leaded 110 octane ,also had 113 octane oxegenated leaded...guess they were not a unleaded gas

 

[smo0oth1]

You can run leaded gas if you please, The lead will only harm O2 sensors which you dont have. Lead also acts as a cylinder lubricant so that's a plus.

 

[Ironhorse]

cool..gonna try it!thanks

 

[scuzz]

You can run leaded gas if you please, The lead will only harm O2 sensors which you dont have. Lead also acts as a cylinder lubricant so that's a plus.

...and doesn't it (the lead in the gas) also act as some sort of cushion for valves.

 

[smo0oth1]

If you wanna call soot cushion, Yes lol

 

[scuzz]

If you wanna call soot cushion, Yes lol

If I remember seeing something on TV about it...grrr I can't remember where, they were talking about late 60's heads/valves really needing it because of the shitty valve seats (my words).

 

[smo0oth1]

Soft valve seats, Some good reading on Leaded Fuel below

http://www.walshcarlines.com/pdf/mechanicalimplications.d4e.pdf