Hydrogen Peroxide as a combustion chamber cleaner?

[Loobed]

I have used water injection as a combustion chamber cleaner. I was wondering if hydrogen peroxide (3% store grade) would do a better job. It is basically water with an extra oxygen molecule. When it decomposes it becomes H20 and O2. I was thinking that the extra oxygen might combine with the carbon to form CO2. I have read that it can also combine with other compounds to form an acid. I was also concerned if the extra oxygen would attach itself to the iron in the cylinder and cause increased wear, or remove oil from the cylinder wall.

any thoughts?

 

[chubbs1]

Oils are designed to fight compounds like peroxides. I don't think it would be my first choice. I would look for some other products. Maybe someone has more info. I have always been under the impression peroxides were not a good thing.

 

[ARCOgraphite]

Been using 35% h202 and ethanol for years in the 70 and eighties as a CC cleaner injested through a TPI vacuum port at the primary throttle. You just introduce enough to be used in the combustion. After a cc cleaning you should ALWAYS do an OC to get the blowby out of the sump. Caution! - watch your cocktail injestion rate - bent rods and broken pistons and blown headgasket(s) are just one "Uhh Ohh!" away

Also I would NOT recommend fast steam decarboning on any modern FI catted engine.

 

[FiremarshalRob]

35% H2O2?
Where did you find that concentrated dose of such a strong oxidizer?
50% and up and your asking for trouble.

Oxidizers and hydrocarbons (organics) do not get along well at all.

Wow, impressive.

Rob

 

[Loobed]

Originally Posted By: ARCOgraphite
Been using 35% h202 and ethanol for years in the 70 and eighties as a CC cleaner injested through a TPI vacuum port at the primary throttle...

... Also I would NOT recommend fast steam decarboning on any modern FI catted engine.




What is FAST STREAM decarboning? I have a windshield washer pump that I use to squirt water into my engine. I rev the motor to just under the redline (6000 RPM??) and hit the button. The engine gets a quart of water in under a minute.



DO you need special permits for 35% H2O2?

 

[Loobed]

Originally Posted By: FiremarshalRob
35% H2O2?

Oxidizers and hydrocarbons (organics) do not get along well at all.


Rob



I know that, but what about the split second it is in the combustion chamber?

Would it cause pre-ignition? If I had an old motor, I would experiment myself.

 

[friendly_jacek]

I like your thinking. But 3% is not going to cut it. Go ahead and inject some NOS (while accelerating at WOT), that will clean your pistons!

 

[Shannow]

IIRC, the Germans experimented with it as a water injection agent in WWII, using its oxygenating abilities as a charge cooler and oxygen enhancer.

As others have said, 3% isn't much chop.

If you find the 35%, I think it needs freezer storage, and ingestion by humans is not very nice, so be careful.

 

[ARCOgraphite]

Got the stuff as "expired' indutrial waste in 1 GAL jugs.
HOT (70c) H2O2 was used in a wet bench tank for cleaning of ceramic substrates (used in telecommunication I.C manufacture), the last tank that follows was a quick dump D.I. Water spray and rinse.

 

[ARCOgraphite]

Just do a mix of your 3% H202 and 20% ethanol. Cheap Vodka works well

I would recommend multiple WOT bursts around 1/2 redline and no more than a pint in a minute through a bug spray atomiser nozzle. Connecting rods hurt when they whack you in the ankle

 

[Loobed]

Originally Posted By: ARCOgraphite
Just do a mix of your 3% H202 and 20% ethanol. Cheap Vodka works well

I would recommend multiple WOT bursts around 1/2 redline and no more than a pint in a minute through a bug spray atomiser nozzle. Connecting rods hurt when they whack you in the ankle

What about rubbing alcohol (isopropyl)?

 

[ARCOgraphite]

Or, Old Cologne, like Hai! Karate!

 

[Darkfire]

Originally Posted By: FiremarshalRob
35% H2O2?
Where did you find that concentrated dose of such a strong oxidizer?

You can buy Food Grade (35%) H2O2 at organic food Co-op's, they would have it stored in a freezer if they carried any. You can also buy it online. If it is actually 35%, it will NOT freeze in a typical freezer.

Originally Posted By: FiremarshalRob
50% and up and your asking for trouble.

Anything beyond Food Grade (35%) would be totally unavailable to the public. 90% is the strongest that can be made in a lab, and that is for military, NASA use (rockets).

Originally Posted By: Loobed
DO you need special permits for 35% H2O2?

Not at all, see above.

Originally Posted By: Shannow
If you find the 35%, I think it needs freezer storage, and ingestion by humans is not very nice, so be careful.

Yeah it needs freezer storage or it will chemically break down into weaker concentrations in short order, In a freezer it is good for about 6 months. 35% will cause painful chemical burns if it touches the skin, and is LETHAL if ingested (not to mention that the pain would be unimaginably horrific before you died).