The video provides a detailed explanation of the process of degreeing a camshaft on a Chevy small-block engine. The speaker begins by setting the timing gear on the engine, ensuring that the gears are dot-to-dot for accurate timing. The gears are then torqued down.
The speaker explains the importance of finding true top dead center (TDC) as the starting point for degreeing the camshaft. This is done by running the engine and adjusting the degree wheel until the piston is at the correct position.
The speaker also introduces a tool, a lifter bore indicator, which is used to accurately measure the lift of the camshaft. This is important for verifying the correct camshaft for the engine.
The speaker then proceeds to degree the camshaft, starting with the intake duration. The process involves measuring the lift at the lobe, calculating the valve lift, and verifying it against the specifications of the camshaft. The speaker also explains how to calculate the lobe centerline and duration.
The speaker emphasizes the importance of verifying the correct camshaft and ensuring accurate degreeing for optimal engine performance. A few degrees difference may not significantly impact the performance of a light truck engine with a mild cam, but it's important to ensure the camshaft is dialed in correctly.
The speaker also provides some additional steps that were not covered in the video, such as degreeing the exhaust side and lobe separation.
The speaker concludes by summarizing the process of cam degreeing, emphasizing that it's not as hard as it may seem and can be done systematically and accurately.
1. The text discusses the process of setting up timing gears on a small-block Chevy engine. The gears are set up so that they are dot-to-dot, which provides the initial timing for the engine.
2. The text explains that the gears are then "degreeed" or adjusted to ensure the timing is accurate. This is done by torquing the bolts and using degreeing tools.
3. The text describes the process of finding true top dead center (TDC) on the engine. This involves running the engine, adjusting the degree wheel, and using a lifter bore indicator.
4. The text explains that the cam shaft lift is checked to verify the cam timing and to ensure the correct cam shaft is being used. This is done by measuring the lift at the lobe and comparing it to the specifications of the cam.
5. The text outlines the process of verifying the lobe centerline, which is done by rotating the engine until the lobe bore gauge rides the profile of the lobe all the way to the top.
6. The text describes how to check the duration of the valve opening. This is done by coming off the base circle a specified amount, reading the degree wheel, going all the way up to the top of the lobe travel, and all the way down the other side, and stopping at five thousandths.
7. The text explains that the duration is crucial because it determines how many degrees the crankshaft rotates while the valve is open.
8. The text notes that the duration can be adjusted by using an offset bushing, but this is usually only done on engines that require a specific cam timing.
9. The text concludes by stating that the process of setting up the timing gears, degreeing the cam, and checking the cam shaft lift and duration is crucial to ensuring the engine performs optimally.