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Dirt Bike Mods & Maintenance
Synthetic or Mineral Engine Oil for 2 Strokes?
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[QUOTE="jaguar, post: 1468968, member: 19340"] Also Yamalube 2R has about 60% group 3 oil and most everyone loves it. Here's a report I found on the internet about how more oil increases power: "I have run Dyno tests on this subject. We used a Dynojet dynamometer, and used a fresh, broken in top-end for each test. We used specially calibrated jets to ensure the fuel flow was identical with each different ratio, and warmed the engine at 3000 rpm for 3 minutes before each run. Our tests were performed in the rpm range of 2500 to 9000 rpm, with the power peak of our test bike (a modified '86 YZ 250, mine) occurring at 8750 rpm. We tested at 76 degrees F, at 65% relative humidity. We started at 10:1, and went to 100:1. Our results showed that a two-stroke engine makes its best power at 18:1. Any more oil than that, and the engine ran poorly, because we didn't have any jets rich enough to compensate for that much oil in the fuel, and the burn-characteristics of the fuel with that much oil tended to be poor. The power loss from 18:1 to 32:1 was approximately 2 percent. The loss from 18:1 to 50:1 was nearly 9 percent. On a modern 250, that can be as much as 4 horsepower. The loss from 18:1 to 100:1 was nearly 18 percent. The reason for the difference in output is simple. More oil provides a better seal between the ring and the cylinder wall. " [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Synthetic or Mineral Engine Oil for 2 Strokes?
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