Post by 90GTVert on Sept 25, 2012 20:24:26 GMT -5
Two-Stroke Oil Comparison
The oils tested and a little info from their manufacturers...
AMSOil Saber Professional 100:1 Synthetic
Synthetic : Yes
Current Price : $10.75/quart
From AMSOil :
"AMSOIL Saber™ Professional is formulated with exclusive AMSOIL synthetic base oils and premium additives. Designed for lean mix ratios in two-cycle motors, Saber 2-Cycle Oils have excellent lubricity and cleanliness properties to control friction and help prevent wear, plug fouling, ring sticking and exhaust port blocking. Saber 2-Cycle Oils also feature an anti-rust formulation to counteract the damp environments often encountered in two-cycle applications."
Havoline TC-W3
Synthetic : No
Current Price : $?
From Havoline/Chevron :
"Havoline 2-Cycle Engine Oil TC-W3 is a high quality two stroke engine lubricant that delivers excellent performance in water-cooled and air-cooled
applications. It is formulated to provide excellent lubrication and deposit control in a wide range of applications.
Havoline 2-Cycle Engine Oil TC-W3 contains a special ashless detergent designed to help keep piston rings from sticking promoting smooth and efficient engine operation. Havoline 2-Cycle Engine Oil TC-W3 will help
keep the engine clean of deposits and will also protect the pistons from scuffing and preignition problems."
"Havoline 2-Cycle Engine Oil TC-W3 is well suited for engines using oil injection systems with fuel/oil mixture ratios of up to 150:1."
Maxima Scooter 2T
Synthetic : No
Current Price : $8.50/liter
From Maxima :
"Premium quality low-smoke 2-cycle engine lubricant for both premix and oil injector use in scooters and mopeds. Clean burning while providing excellent protection to all engine parts. "
Engine Setup Used For Testing
[/size][/color]The oils tested and a little info from their manufacturers...
AMSOil Saber Professional 100:1 Synthetic
Synthetic : Yes
Current Price : $10.75/quart
From AMSOil :
"AMSOIL Saber™ Professional is formulated with exclusive AMSOIL synthetic base oils and premium additives. Designed for lean mix ratios in two-cycle motors, Saber 2-Cycle Oils have excellent lubricity and cleanliness properties to control friction and help prevent wear, plug fouling, ring sticking and exhaust port blocking. Saber 2-Cycle Oils also feature an anti-rust formulation to counteract the damp environments often encountered in two-cycle applications."
Havoline TC-W3
Synthetic : No
Current Price : $?
From Havoline/Chevron :
"Havoline 2-Cycle Engine Oil TC-W3 is a high quality two stroke engine lubricant that delivers excellent performance in water-cooled and air-cooled
applications. It is formulated to provide excellent lubrication and deposit control in a wide range of applications.
Havoline 2-Cycle Engine Oil TC-W3 contains a special ashless detergent designed to help keep piston rings from sticking promoting smooth and efficient engine operation. Havoline 2-Cycle Engine Oil TC-W3 will help
keep the engine clean of deposits and will also protect the pistons from scuffing and preignition problems."
"Havoline 2-Cycle Engine Oil TC-W3 is well suited for engines using oil injection systems with fuel/oil mixture ratios of up to 150:1."
Maxima Scooter 2T
Synthetic : No
Current Price : $8.50/liter
From Maxima :
"Premium quality low-smoke 2-cycle engine lubricant for both premix and oil injector use in scooters and mopeds. Clean burning while providing excellent protection to all engine parts. "
Engine Setup Used For Testing
1E40QMB Air Cooled Chinese Horizontal Minarelli Clone
Naraku Crankshaft w/Big And Small End Bearing Oiling Improvements
Naraku Wrist Pin Bearing
Previously Used Stock 40mm Cylinder, Ported
New Stock Replacement Piston From ScrappyDogScooters, Modified
Stock Cylinder Head, Milled To Achieve 7:1 CCR
Ignition Timing At 20° BTDC
Stock Airbox, Carburetor, Intake Manifold, Reed Assembly
Leo Vince GP 50-70cc Exhaust
NGK BR8HS Spark Plug, 0.028" Gap
Unfortunately, I just couldn't afford a brand new top end. Ideally, I would have liked to use a new spark plug, cylinder, piston, piston rings, wrist pin, and wrist pin bearing for each test. That's a lot of money, that I don't have. The only parts I replaced after every test were the spark plug and of course any gaskets needed. Otherwise, everything was cleaned up before/after each new mix ratio or oil tested.
I did have to replace the piston before any testing, because the old one with the cylinder was damaged from a past circlip failure at high RPM. The piston came from ScrappyDogScooters with a coating on it. I wanted to have a finish that I could re-create each time, so I buffed it. I also had to file and smooth the piston's crown in order to get the transfer durations that I had used in the past with this setup with good results, so I smoothed out the rough crown in the process. Here are pictures of the piston before and after my changes.
All pics of engine parts in this thread are 1920 x 1080 resolution so any damage can be viewed in greater detail. Click the appropriate thumbnail to go to a larger image. Click that image to view full size.
Cleanup includes honing the cylinder. I used a ball hone for 5-10 seconds, just enough to knock out the minor scuffs and put a crosshatch in the cylinder again. The exhaust port of the cylinder was cleaned with a wire wheel Dremel bit to remove any deposits or coloration. The cylinder head was cleaned with a wire wheel Dremel bit as well to remove carbon. The piston was sanded lightly with 400 grit to remove scuffs and carbon. Anything beyond a minor scuff, I made no attempt to sand out. The ring lands in the piston were cleaned with a wire wheel Dremel bit as well to remove coloring and deposits. The underside of the piston crown was cleaned with the Dremel wire wheel. The piston was buffed to a uniform finish. I also used a bench buffer to clean the wrist pin after each test.
Here are pics of the cylinder, cleaned up before any of the tests were done.
Here's a look inside a cleaned exhaust port.
Here's the cylinder head after a cleaning.
I will provide pictures of any leftover scarring or points of interest after each cleanup, so hopefully you can get a good idea of what's happening during each test.
Jetting Details
This setup was initially tuned before all oil tests at 50:1 using an 85 main jet. Changing the amount of oil in the fuel can affect jetting, so here's how I compensated. Unfortunately, I can only get jets in whole sizes.
Mix Ratio | % Oil In Fuel | Correction vs 50:1 | Jet Used |
40:1 | 2.5% | +0.5% (+0.425) | 85 |
50:1 | 2% | 0% (0) | 85 |
80:1 | 1.25% | -0.75% (-0.6375) | 84 |
100:1 | 1% | -1% (-0.85) | 84 |
Each test was roughly 100 miles. It's hard to ride exactly 100 miles each time, but the lowest mileage was 98.X and the highest was 100.25. I rode in areas that would allow wide open throttle most of the time, but I did take a brief trip through a town with some part throttle riding on each trip. I attempted to be consistent in my riding method each time. The CVT was setup to work with the combo and generally kept RPM from the mid 8,000 range up to, and sometimes beyond, 9,000RPM. More details on exact RPM for each test will be provided later.
AMSOil Saber Professional @ 40:1
Spark plug.
Wrist pin.
Cylinder head.
Exhaust port.
Cylinder.
Piston crown.
Underside of piston.
Ring lands.
Piston skirt.
Cleanup After AMSOil 40:1, Before AMSOil 50:1
No leftover marks on cylinder. I had pics after honing, but I can't seem to figure out where they went. Only a few minor scratches leftover on the piston skirt. The orange color you see on the underside of the head is overspray from copper spray gasket. I saw no reason to spend the extra time cleaning that on every test.
AMSOil Saber Professional @ 50:1
Spark plug.
Wrist pin.
Cylinder head.
Exhaust port.
Cylinder.
Piston crown.
Underside of piston.
Ring lands.
Piston skirt.
Cleanup After AMSOil 50:1, Before AMSOil 80:1
Again, just some minor scratches left over on the piston. The cylinder seemed to gain no new scars.
AMSOil Saber Professional @ 80:1
Spark plug.
Wrist pin.
Cylinder head.
Exhaust port.
Cylinder.
Piston crown.
Underside of piston.
Ring lands.
Piston skirt.
Cleanup After AMSOil 80:1, Before AMSOil 100:1
A few more scratches in the piston. This time there are some extra scratches in the cylinder too.
AMSOil Saber Professional @ 100:1
Spark plug.
Wrist pin.
Cylinder head.
Exhaust port.
Cylinder.
Piston crown.
Underside of piston.
Ring lands.
Piston skirt.
Coloring below rings.
Cleanup After AMSOil 100:1, Before Havoline 40:1
