More HP?

Originally Posted by yorkie_chris

Not on my money. I'll send an email to guy and see how much it is for couple of test shots.

Anyways I will see if I can find a dyno somewhere and get it tested on that with & without. So what does this machine actually do?

At least the higher octane should help with the knock sensor on the SV engine.

[yorkie_chris]

Do you understand what octane rating means yet as this won't make much sense otherwise.

The chamber gets preheated and a charge of fuel and air is "loaded", then on pushing the little red button the piston gets whacked up into the chamber rapidly compressing the fuel. A pressure transducer measures the pressure spike in relation to chamber pressure, piston position and temperature.
I think this one can run as spark ignition and compression ignition.

From that you can get a pretty good indication of octane rating, I know he has tested winter blend of V-power, couple of alcohols, and octane and heptane baseline fuels.

You also get some pretty pictures of the burn in progress.

Originally Posted by yorkie_chris

Do you understand what octane rating means yet as this won't make much sense otherwise.

The chamber gets preheated and a charge of fuel and air is "loaded", then on pushing the little red button the piston gets whacked up into the chamber rapidly compressing the fuel. A pressure transducer measures the pressure spike in relation to chamber pressure, piston position and temperature.
I think this one can run as spark ignition and compression ignition.

From that you can get a pretty good indication of octane rating, I know he has tested winter blend of V-power, couple of alcohols, and octane and heptane baseline fuels.

You also get some pretty pictures of the burn in progress.

After testing all those other fuels, how do they differ from each other? as in like from start (burning) to finish, performance or whatever terms you use with this machine ?

[yorkie_chris]

But actually thinking about it, this is pointless for this discussion. The standard SV doesn't NEED a higher octane rating. In fact you can advance the ignition further still without running into detonation issues.

Proof in pudding is your dyno test.


Ok some alcohol like methanol has a very high octane rating, meaning you run about 15:1 compression ratio. Octane is 100RON, Heptane is 0, methanol above 100.
But unless you are going to increase your compression ratio to actually need higher octane there cannot be a power gain.


You design an engine to work with a fuel, it works best on this fuel. Stock SV engine is designed for 95RON.

Originally Posted by yorkie_chris

But actually thinking about it, this is pointless for this discussion. The standard SV doesn't NEED a higher octane rating. In fact you can advance the ignition further still without running into detonation issues.

Proof in pudding is your dyno test.

So.. Without buying a more powerful bike, seriously what 3 main things would you do to increase the power output of the SV650? if you would be kind to just give an answer.

Skim the head then for a higher compression ratio, more power, and fine if there's no knock issues as standard. Then the supposed octane booster may help when mapping the ignition (no idea how this is changed on the SV though).

I'd spend the money on better front springs and fork oil, a much better way of making the SV a faster machine.

Have a fun discussion, I'm off to bed, got to get up early for a stag do in Bulgaria.

[yorkie_chris]

Originally Posted by SuperLC

So.. Without buying a more powerful bike, seriously what 3 main things would you do to increase the power output of the SV650? if you would be kind to just give an answer.

Full exhaust system £200
flatslide carbs £7-800
cam swap £100

Plus dyno time. This could get you a strong 85-90bhp depending on the optimism of the dyno.

Now you see why people are laughing when you want to add power for £100? There really isn't anything you can do for that price to gain any significant power.