|
|
|
|
Original Message
|
| Total timing |
| By Royce Peterson - 04/29/2005 11:47:34 AM; IP 66.161.213.36 |
"It Depends"
You need a minimum of 34 degrees of total timing advance and maybe as much as 45 degrees. A lot depends on your engine - compression, cam, type of fuel etc. Also important is the gearing and the vehicle weight.
Total timing describes the sum of the following:
1. Initial timing
This is set with the engine at idle speed with vacuum advance disconnected and plugged. Typical settings are from 6 - 15 degrees.
2. Centrifugal advance
This is checked at 3000 rpm with the vacuum advance disconnected and plugged. Typical readings might be 32 degrees on a car with vacuum advance or 38 on a car not equipped with vacuum advance. To reset centrifugal advance you will need to change the limits of the flyweight assembly inside the distributor which requires disassembly and / or removal in most cases.
3. Vacuum advance
It is measured at 3000 RPM with the engine running in a no - load situation and everything connected. To come up with the vacuum advance number you subtract the number measured in step 2 above.
In a stock 390 - 2V pickup truck the total timing might be as much as 45 degrees acording to factory specs.
Royce |
|
|
This thread, so far...
|
|
|
|
Post A Response
|
|
|
|
|
|