An acetone success

[DIYMark]

I went for a cruse and my cruzing speed and max speed have been "Shifted" forward by 6Km/h. In addition the engine is smoother but as I predicted Ive lost some bottom end.

From now on I'll be adding acetone. At 2ml per litre my $10 investment (750mls of 100% Acetone) will last for 187.5 tanks of fuel! Ill be lucky if I have the same engine by then lol!

Lastly the engine is easier to start - I don't need to use choke any more (only ever used 1/2 choke before otherwise it would die shortly after starting).

So far the seals are holding up. But in addition Ive redone the carburetor gaskets with High temperature Loctite flange sealant as there was always a slow leak via the gasket.

 

[Flapdoodle]

I went for a cruse and my cruzing speed and max speed have been "Shifted" forward by 6Km/h. In addition the engine is smoother but as I predicted Ive lost some bottom end.

From now on I'll be adding acetone. At 2ml per litre my $10 investment (750mls of 100% Acetone) will last for 187.5 tanks of fuel! Ill be lucky if I have the same engine by then lol!

Lastly the engine is easier to start - I don't need to use choke any more (only ever used 1/2 choke before otherwise it would die shortly after starting).

Thanks! Looks like you have verified what I found. The smoother running makes me a believer.

As for diluting lubrication, I would be more worried that the large amount of gasoline would reduce it rather than acetone. Gasoline is a poor lube.

A little off topic, but I added a fuel gage. Simply a tee off the main fuel line with clear tubing which is attached to the tank filler with a nylon cable tie. Gives me a little more peace of mind.

 

[fastboy9]

right! im convinced, in it goes...

 

[BSA]

Seems definitely worth a try, STP or Redex her in England seems to work well aswell.

BSA

 

[DIYMark]

STP/Redex?

I'm guessing they are octane boosters. Many people say you only get benefits of them in high compression engines but that's false. Their "surface tension breaking" abilities give similar effects of Acetone.

Speaking of compression I removed the bottom gasket (between the Crank case and cylinder) and used Loctite high temp flange sealant, in addition I milled my cylinder head by 1.2mm. Sounds like Ive got tons of compression but Ive also "Ported" my engine by filing the skirt near the inlet and at the exhaust and transfers because the exhaust in still not fully opened at TDB (2mm of piton still shows at the exhaust). Same for the transfers. The bottom of the transfer is lined up with the middle of the top piston ring at TDB - talk about a shoddy design lol.

This then lowered my compression a bit but now its at around 8:1. However, the fuel around here is 91 octane for regular and premium is 98 (I only use 91 though) but adding fully synthetic oil (that contains xylene) and acetone is enough octane boost for me.

Also the lightened piston happened to balance the engine lol! It revs smoother and higher plus the toque curve has stretched further into the RPM range (I can get a more "fuller" cylinder of fuel/air for longer in the RPM's = more torque).

 

[Flapdoodle]

Speaking of compression I removed the bottom gasket (between the Crank case and cylinder) and used Loctite high temp flange sealant,

I looked at a Loctite catalog, and found 7 flange sealers. Some are acrylic, some
silicone. What was the number of the one you use.

Mild porting is on my list of to-do.

Thanks
~Flap

 

[DIYMark]

I used the 510 sealant - its a pink paste.

 

[DIYMark]

I double checked (I used it today while installing my boost bottle) and its definatley 510.

 

[Flapdoodle]

I have about 400 miles now, bought a speedometer. One run without acetone I got it up to 29.7 MPH and could not coax it any higher. Added about 8cc of acetone and got it to 34 MPH. However the wind had come up so this is a bit higher than it should be. The t\return run only got to 25 against the wind. Hit a bump on this lousy back road and went airborne. I am too old to be doing that.

 

[fastboy9]

wow, acetone seems to be quite a performance enhancer then! in theory it should increase the low end torque because of the better combustion (so I've heard). And if it increases MPG whilst increasing BHP then that sounds like a nice mixture