![]() ![]() So, in the 720 degrees of rotation it takes to do the complete intake-compression-power-exhaust cycle, the Jeep has less time in between cylinder firings. So, already, you'd think the Jeep would be able to idle at rpm lower than 900. So obviously the Jeep has a heavier rotating assembly, and therefore it carries more inertia at any engine speed. Newer engines, such as the honda I have, has aluminum block (not that it matters here), rods and pistons (a lot lighter than steel), and a steel crank. Yes, but what I'm getting at is a lot of old engines (the 4.0 design roots go back to 1962) have idle spec'd as low as 650-750 rpm, as the heavier parts help carry the momentum so it'll idle at that speed without any roughness/running out of momentum. ![]() What does a idle speed have to do with a high revving engine? One has nothing to do with the other.
0 Comments
Leave a Reply. |