V-Power question...

[plowsie]

Okay now as some of you will remember I had a problem a while back with the bike hitting a bog spot in the revs and making a horribl noise. So today I filled up with ?10 of V-power for when I was out with Sean and on the way back to my house the problem started again...Is it likely to be linked with the V-power?

Bike is a 93 CBR600-FP

Thanks in advance

Stu

[Dangerous Dave]

Wouldn't have thought it was down to the V-power alone, do you know what the fuelling is like?

Have you adjusted from the V-twin engine yet, with the torque throughout the range may catch you out when moving to IL4's???

[the_lone_wolf]

v-power is bought less frequently, especially with prices like they are today, so sits in the tanks at the station longer than regular unleaded, perhaps it'd gone off?

[plowsie]

Wouldn't have thought it was down to the V-power alone, do you know what the fuelling is like?

Have you adjusted from the V-twin engine yet, with the torque throughout the range may catch you out when moving to IL4's???
Dont quite understand that question...Have I adjusted from a V-twin engine yet - yes two of them...I know what the torque and power feels like :???:
v-power is bought less frequently, especially with prices like they are today, so sits in the tanks at the station longer than regular unleaded, perhaps it'd gone off?
Be a lucky catch if I hit it twice...

[Alpinestarhero]

I've found that using V-power has slightly improved my feuling (to a significant enough effect that I'll go back to using it); I can't imagine it would be causing your problems, but then again its not totaly out of the question. Have you tried using differant brands of fuel? I had some problems using texaco fuel - sort of hesitation etc at aprox 4000 rpm on part throttle in the same way you have been describing....

Is there any chance moisture is getting into the engine or inbetween the spark plug and leads?

Matt

[plowsie]

Nah cos I had all apart the other week and put it back together all cushty. And I went out Saturday night to meet Stewie with a pair of tyres strapped to the bike, and it was the worst rain the CBR has ever seen, it was lashing it down and was out in it for about an hour and fifteen, so woulda occured then if water was getting in anywhere. The problem had cleared up completely till I put that in, may just be coincidence. I had some petrol left in it so the while me and Sean were out it must've been using the last of that then on the way back got down to the V-power, which is all too convenient really. I'm just confused totally :lol:.

[Blue_SV650S]

v-power is bought less frequently, especially with prices like they are today, so sits in the tanks at the station longer than regular unleaded, perhaps it'd gone off?

+1

[ThEGr33k]

Its your brain telling you to come back to the light (V-twin bikes) thats all. Or the V-power fuel has gone off....:(

[plowsie]

But is it likely that I coulda caught it twice like that?

[Dangerous Dave]

I wouldn't have thought the V-power is off some how, could just be that your bike doesn't like to run aswell with it! My 650 will run better on V-power than the 750 but I wouldn't bother using it again, there is no performance gain.

[Blue_SV650S]

But is it likely that I coulda caught it twice like that?


did you buy it from the same place?!!?? .. it is prolly still the same batch, just even more smeggy now!!!! :shock:

[ThEGr33k]

I wouldn't have thought the V-power is off some how, could just be that your bike doesn't like to run aswell with it! My 650 will run better on V-power than the 750 but I wouldn't bother using it again, there is no performance gain.


Sorry for being off subject but what RWP does your bike give Dave?

[Dangerous Dave]

Sorry for being off subject but what RWP does your bike give Dave?
The Old Bird is due for a dyno actually, she has had a lot of work done since the last one. At the last run she was around 87bhp and 58ft, I am at work so I haven't got the exact figures at hand (point something or other).

I haven't really been looking for performance in the past year and a half as the 750 was the only on road bike so reliabilty was more of an issue.

That may change.....

[ThEGr33k]

The Old Bird is due for a dyno actually, she has had a lot of work done since the last one. At the last run she was around 87bhp and 58ft, I am at work so I haven't got the exact figures at hand (point something or other).

I haven't really been looking for performance in the past year and a half as the 750 was the only on road bike so reliabilty was more of an issue.

That may change.....

Is that at the back wheel? I think I might have to get mine dyno tested... See what the curve looks like etc.

[Dangerous Dave]

Yeap, back wheel! I don't tend to post it on here as it turns into my bike makes more than yours, it sdoesn't make sense comparing different bikes.

Your Falco should have a good curve IIRC, very torquey are the 60' Aprilia V-Twin!

[ThEGr33k]

Yeap, back wheel! I don't tend to post it on here as it turns into my bike makes more than yours, it sdoesn't make sense comparing different bikes.

Your Falco should have a good curve IIRC, very torquey are the 60' Aprilia V-Twin!

Indeed. Should (I hope) be around 110BHP back wheel which is more than enough for roads imo. The curve I dont think will be too nice. I think I have some dips at about 5K rpm and it picks up a lot at 7Krpm. Might be something a new ECU chip could sort. PCIII would too but my insurance wouldnt like that too much :(.

^^ No need to have a mine does more than yours... Like you say we have different bikes, I have a fair few CC's for a start :cool: 87BHP though is impressive! :D

[ThEGr33k]

Indeed. Should (I hope) be around 110BHP back wheel which is more than enough for roads imo. The curve I dont think will be too nice. I think I have some dips at about 5K rpm and it picks up a lot at 7Krpm. Might be something a new ECU chip could sort. PCIII would too but my insurance wouldnt like that too much :(.

^^ No need to have a mine does more than yours... Like you say we have different bikes, I have a fair few CC's for a start :cool: 87BHP though is impressive! :D


Back on subject

A test for you plowsie drain the tank into a jerry can (or just get rid) fill up with normal 95ROM petrol and see if you have the issue. Simple enough. :cool:

[plowsie]

Already planned to do that tomorrow :)

[ThEGr33k]

Cool. Let us know the outcome ;)

[Tim in Belgium]

Plenty of scoobies and Evos sucking up the V power at my local shell, and the 99 Ron at Tesco, so doubt it sits about that long with everyone averaging less than 20 mpg....

[ThEGr33k]

Why do they want it for their scoobies.... they think it makes any difference?

Speaking of scobies. WTF have they done to them with the new model.... Ahhhhhhh! ITS SOOO UGLY.

[Tim in Belgium]

RON rating affects the knock, my car is meant to run 100RON (available in Japan) but I run it on 99 over here. On a turbo pre detonation can be a big problem, that basically kills your bottom end (i.e big ends etc), Hence the jap import cars always filling up on V-power and 99-Tesco, BP only does 97RON.

I agree about the new Scoobies, looking for an RB 320 when (if) I get rich.

[Blue_SV650S]

Why do they want it for their scoobies.... they think it makes any difference?

Speaking of scobies. WTF have they done to them with the new model.... Ahhhhhhh! ITS SOOO UGLY.

Any car with a 'knock' sensor can make use of the higher octane fuel, I presume the above cars have them!?!? ;)

The basic premise is that the more advanced you can make the timing, the more power you will produce. The problem is that advancing the timing increases the risk of 'pinking' AKA pre-ignition.

Octane reduces the onset of pre-ignition, manufactures sell these cars worldwide, there is obviously variation in RON. So the manufactures play it safe and set the timing retarded enough that even with the lower RON, you won't get pre-ignition.

Where a more 'intelligent' ignition with a knock sensor (pre-ignition sensor) can advance the timing 'safely' with higher ron fuels ... the upshot being - stick 92RON fuel in and you will get X BHP, put 102octane in and you will get X+Y BHP as the car will advance the timing for you! 8)

It is for this very same reason that an SV WON'T directly benefit from high octane fuel .. it's just too dumb!! ;)

[Tim in Belgium]

And if your car is tuned for 100 Ron fuel with a less than effective knock sensor it may screw itself in the process when running on low octane fuel....

[Tim in Belgium]

Do FI SVs have a knock sensor?

[Luckypants]

don't think so.

[ThEGr33k]

Any car with a 'knock' sensor can make use of the higher octane fuel, I presume the above cars have them!?!? ;)

The basic premise is that the more advanced you can make the timing, the more power you will produce. The problem is that advancing the timing increases the risk of 'pinking' AKA pre-ignition.

Octane reduces the onset of pre-ignition, manufactures sell these cars worldwide, there is obviously variation in RON. So the manufactures play it safe and set the timing retarded enough that even with the lower RON, you won't get pre-ignition.

Where a more 'intelligent' ignition with a knock sensor (pre-ignition sensor) can advance the timing 'safely' with higher ron fuels ... the upshot being - stick 92RON fuel in and you will get X BHP, put 102octane in and you will get X+Y BHP as the car will advance the timing for you! 8)

It is for this very same reason that an SV WON'T directly benefit from high octane fuel .. it's just too dumb!! ;)

I know about pre ignition and all that joy. Just didn't realise that the cars would be able to tell what was in them. if they can alter the timing by what fule they have then fair enough.

I dont think FI SV's have them either, tis a pretty basic FI system. Not sure what bikes do. :rolleyes:

[Tim in Belgium]

And when running a turbo the mixture is hotter and invariably more disposed to pre ignition, one of the main contributing factors for over boosted turbos blowing up rather than just the power.

[ThEGr33k]

And when running a turbo the mixture is hotter and invariably more disposed to pre ignition, one of the main contributing factors for over boosted turbos blowing up rather than just the power.


Hmph. Thats not too cool is it :S Super charger FTW :cool:

[Tim in Belgium]

Any compression heats up mixture rearranging the general gas laws gives T=pv/nR, hence the importance of intercoolers in addition to charge density.

[ThEGr33k]

Any compression heats up mixture rearranging the general gas laws gives T=pv/nR, hence the importance of intercoolers in addition to charge density.

indeed. Some people looking for peak power runs pack them with ICE. I know a little bit about the basics of them. :D

[Tim in Belgium]

Or water spray.... Way too obsessive, I like to be able to get in a vehicle and drive/ride it.

As for hard core ICE, I grew out of that when I was 17...

[ThEGr33k]

Or water spray.... Way too obsessive, I like to be able to get in a vehicle and drive/ride it.

As for hard core ICE, I grew out of that when I was 17...

Erm... I must be a bit slow... HUH? :confused:

[Tim in Belgium]

ICE = in car entertainment, subs, amps etc. All fell out when I rolled my first car.

[ThEGr33k]

ICE = in car entertainment, subs, amps etc. All fell out when I rolled my first car.

Rolled. :confused: You were a chav? :smt075

[Tim in Belgium]

Not a Chav, it was a VW beetle, but I discovered they're no sports car....

[ThEGr33k]

Not a Chav, it was a VW beetle, but I discovered they're no sports car....

LoL. You could have asked just about anyone to find that out without having to put it to the test ;)

[yorkie_chris]

Do FI SVs have a knock sensor?

Nope.


Charge density and temperature is massively important, in the later stages of world war 2 the merlin and griffon engines were running a 2 stage supercharger with intercooler and aftercooler. That combination would give about 25psi of boost, which is massive, it was the cooling and lots of lead in the fuel which allowed the engines to run this pressure without detonating themselves to bits.

Nitrous injection, provided it's run a little rich also does this, the liquid nitrous on injection has massive latent heat of evaporation, so gives a big charge cooling effect, so can on turbo'd vehicles give massively more power than expected from just the NOx and fuel added.