Jacksprat78 Posted March 18, 2009 Share Posted March 18, 2009 Me and a friend took the bug and the 5T out for a little spin in the car park tonight and got into a conversation about octanes in petrol, European petrol is usually around 97 and America is like 80 something. Then you've got this Vpower which is like 120 i think, my mate says he did notice a slight difference in performance in his car when he used it. So what would happen if you put it onto a 26cc or 30.5cc 2 stroke engine? Would it just destroy the engine or do you think it would handle it and make it go faster, my mate thinks it would i think it would kill the engine Quote Link to comment Share on other sites More sharing options...
Russ81 Posted March 18, 2009 Share Posted March 18, 2009 I thought V-Power was 99 and unleaded was 92 or 97. Quote Link to comment Share on other sites More sharing options...
HappyLad Posted March 18, 2009 Share Posted March 18, 2009 I don't think it would make any difference.... The octane rating of petrol is not a measure of how much energy the fuel releases - its a measure of how much the fuel resists detonation during compression. The 2 stroke motors in petrol cars aren't really performance engines with high compression ratio's, so they don't need fuels that resist early detonation (high octane). Quote Link to comment Share on other sites More sharing options...
R46 Posted March 18, 2009 Share Posted March 18, 2009 (edited) i only use v power + rock oil RACE 2 stroke in my techno kit an minimotos, starts easier,cleaner burn, longer run time too, crispier thottle response compared to normal unleaded.. Edited March 18, 2009 by R46 Quote Link to comment Share on other sites More sharing options...
Russ81 Posted March 18, 2009 Share Posted March 18, 2009 http://www.shell.co.uk/home/content/gbr/pr...w/overview.html Have a read of that, says it helps clean the engine too Quote Link to comment Share on other sites More sharing options...
hoss Posted March 19, 2009 Share Posted March 19, 2009 as far as iam aware octane rating is the amount of power/enegy in the fuel the higher the octane the better the bang normal UK fuel is 95 ron super unleaded tends to be 97,which i also think shell Vpower/Optimax is tesco do a super thats 99,an i always try to get that the fuel they use for track days an racing is a much higheer octane rating,you can find petrol stations that are near race circuits,that sell the 102 ron,fuel at the pumps,but its very expencive but basicly the higher the number the better the bang,an the better the bang,,,,,,,,the more power you will get it will give you the rating on the pump where you get your fuel but currently as i said i use,tesco 99 an it makes a bigg difference to the way the car runs,not like its makes it a rocket ship or anything lol but does run faster/cleaner/smoother/an longer on a higher ron fuel Quote Link to comment Share on other sites More sharing options...
spudski Posted March 19, 2009 Share Posted March 19, 2009 I haven't tried higher octane fuel in my baja yet but i changed to BP Ultimate in my 2-stroke 125 and I did notice a difference, slightly quicker, alot smoother and cleaner burning. Don't see why it won't work the same for a smaller CC engine. Quote Link to comment Share on other sites More sharing options...
Jacksprat78 Posted March 19, 2009 Author Share Posted March 19, 2009 well I know what I'm gonna do this weekend then plus that should be better then for running in the new 30.5cc engine I've just put on the bug. Cheers for all the info people, much appreciated Quote Link to comment Share on other sites More sharing options...
HappyLad Posted March 19, 2009 Share Posted March 19, 2009 I'm really skeptical about you guys saying more expensive fuels give better performance I'm wondering if there is some placebo effect going on here...... Like I said earlier, Octane rating is a measure of a fuels ability to resist compressive detonation (engine knock). AFAIK, the little 2 strokers we use don't have compression ratios that justify the need for high octane fuels.... Obligatory Wikipedia reference quote. Quote Link to comment Share on other sites More sharing options...
Jacksprat78 Posted March 19, 2009 Author Share Posted March 19, 2009 Right well I'm going to get a tank and give it a try just to see and if I don't notice much then I just won't bother in future. Quote Link to comment Share on other sites More sharing options...
creamsodauk Posted March 19, 2009 Share Posted March 19, 2009 i also try to get v power for the rs i ride, the diffrence is their it revs quicker and crisper and runs better. i have tried it in 1/5 and didnt notice the diffrence myself but im sure its because their not as tuned as a 125 sports engine. Quote Link to comment Share on other sites More sharing options...
danharrison Posted March 19, 2009 Share Posted March 19, 2009 try some nos fuel additive i used to run that in my real car it makes a big differance when you re-tune to suit the faster burn times. on 220bhp before 232bhp after. took some tuning tho!!!! Quote Link to comment Share on other sites More sharing options...
Mrp Posted March 19, 2009 Share Posted March 19, 2009 Im with HappyLad on this one im afraid.... was running higher octane fuel for the 1st 6 months of my Bajas life, thought it was great..... ran out of fuel once and had to get standard ASDA unleaded..... bugger all difference apart from the coin i saved. Now i run ASDA unleaded all day long. Like stated, these are not performance engines.... give the higher octanes a go by all means but the difference youll see is all in the mind. Mrp Quote Link to comment Share on other sites More sharing options...
HappyLad Posted March 19, 2009 Share Posted March 19, 2009 Im with HappyLad on this one im afraid.... Don't be afraid. Its perfectly fine to agree with me. Quote Link to comment Share on other sites More sharing options...
Merlin Posted March 19, 2009 Share Posted March 19, 2009 I'm sure lunatik did some dynis somewere with the different fuels, and even proper race fuel.. The engines were worse i beleive with the race fuel, and i'm sure there was no difference with the standard stuff. Quote Link to comment Share on other sites More sharing options...
hoss Posted March 19, 2009 Share Posted March 19, 2009 am quite happy to be proved wrong an if it saves money for every one,all the better Quote Link to comment Share on other sites More sharing options...
norney hurtmore Posted March 19, 2009 Share Posted March 19, 2009 the octane level between unleaded (95 ron) and super unleaded (97) is minimal but there is a difference to be had remember as well you are diluting your fuel by adding 2 stroke oil try using a good quality oil and running a 30-1 mix instead of 25-1 this with super unleaded does make a difference but will increase engine wear but no more than thrashing the engine once its started up (it does need a 3-5 min warmup from cold) Quote Link to comment Share on other sites More sharing options...
robj20 Posted March 20, 2009 Share Posted March 20, 2009 I have to use high octane in my car, and the only reason is to stop detonation due to it being a high compression turbo charged engine. It also doesnt leave as many deposits not because it burns cleaner (thats a myth) its the additives that help clean and lubricate the engine much like leaded petrol used to do. Quote Link to comment Share on other sites More sharing options...
martin Posted March 20, 2009 Share Posted March 20, 2009 I have to use high octane in my car, and the only reason is to stop detonation due to it being a high compression turbo charged engine. It also doesnt leave as many deposits not because it burns cleaner (thats a myth) its the additives that help clean and lubricate the engine much like leaded petrol used to do. Turbo'd cars have lower compression ratios mate than natural aspirated engines, they have to be lower to compensate more air being charged into the engine rather than sucked in, other wise you would get piston melt down by pre ignition, some manufacturers do say to put in high octane, im not saying that your wrong in your car not wanting it, the manufactuer probably says it does but your car being turbo'd is lower compression not higher mate, diesels are even higher compression than petrol this is because they have to ignite what is basically an oil and that means high compression and a good set of injectors to atomize into spray.Diesel turbo's are exactly the same lower in compression than natural aspirated diesels. marty Quote Link to comment Share on other sites More sharing options...
robj20 Posted March 20, 2009 Share Posted March 20, 2009 (edited) Turbo'd cars have lower compression ratios mate than natural aspirated engines, they have to be lower to compensate more air being charged into the engine rather than sucked in, other wise you would get piston melt down by pre ignition, some manufacturers do say to put in high octane, im not saying that your wrong in your car not wanting it, the manufactuer probably says it does but your car being turbo'd is lower compression not higher mate, diesels are even higher compression than petrol this is because they have to ignite what is basically an oil and that means high compression and a good set of injectors to atomize into spray.Diesel turbo's are exactly the same lower in compression than natural aspirated diesels. marty Mine is a high compression turbo charged engine, its 8.5:1 in fact with the NA being higher still i know this because i built it. My block was originally designed to run on leaded petrol i have since had hardened valve seats fitted so i can run unleaded without fear of melting these. I use high octane to reduce temperatures as it burns more efficiently this is what helps with pre-ignition. I also have water/ethanol injection for track day use, but rarely use it as it only lasts about 20 mins of full use. Edited March 20, 2009 by robj20 Quote Link to comment Share on other sites More sharing options...
HappyLad Posted March 20, 2009 Share Posted March 20, 2009 Mine is a high compression turbo charged engine, its 8.5:1 in fact with the NA being higher still i know this because i built it. My block was originally designed to run on leaded petrol i have since had hardened valve seats fitted so i can run unleaded without fear of melting these. I use high octane to reduce temperatures as it burns more efficiently this is what helps with pre-ignition. I also have water/ethanol injection for track day use, but rarely use it as it only lasts about 20 mins of full use. Quote Link to comment Share on other sites More sharing options...
robj20 Posted March 20, 2009 Share Posted March 20, 2009 (edited) ] Back on topic anyway. I would say the best fuel to use is what ever the engine is designed/tuned to with. For 5litres of fuel it barely makes a difference so may as well get the best you can. Edited March 20, 2009 by robj20 Quote Link to comment Share on other sites More sharing options...
HappyLad Posted March 20, 2009 Share Posted March 20, 2009 ] Back on topic anyway. I would say the best fuel to use is what ever the engine is designed/tuned to with. For 5litres of fuel it barely makes a difference so may as well get the best you can. Your right, the cost difference isn't worth bothering about. And, if you do get (or perceive to get ) a performance benefit then thats great. But, if you do get a benefit, its nothing to do with the octane rating of the fuel. - it might be the additives and cleaning agents, but not the octane rating. oh - and the Escort looks great Quote Link to comment Share on other sites More sharing options...
robj20 Posted March 20, 2009 Share Posted March 20, 2009 Cheers. The reason i use super unleaded in mine is purely because that is what i put in my car at the time so just makes sense. Quote Link to comment Share on other sites More sharing options...
madmarder Posted March 20, 2009 Share Posted March 20, 2009 I'm sure lunatik did some dynis somewere with the different fuels, and even proper race fuel.. The engines were worse i beleive with the race fuel, and i'm sure there was no difference with the standard stuff. with these small 2 strokers,you wouldnt even notice the difference,doesnt matter what unleaded you use,the high octane fuels will only benifit the highly tuned higher cc engines Quote Link to comment Share on other sites More sharing options...
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