Engine Timing

Discussion in 'Inboards' started by mikealston2428, Mar 1, 2016.

  1. mikealston2428
    Joined: Jul 2011
    Posts: 203
    Likes: 1, Points: 18, Legacy Rep: 10
    Location: aussie

    mikealston2428 Senior Member

    Hi all,
    I've a chevy 350 small block and I'm currently working on the timing.
    With the vacuum off and plugged and setting advantage timing to 36 degree moving the HIE distributor I'm coming up with a couple of problems.
    From what I've been told the timing should stop advancing between 2500rpm- 3800rpm.
    My advance doesn't stop until around 3800rpm.
    I'm thinking I need to replace the distributor advance springs for a lighter set.
    This should give me all advance at lower revs correct ? ? ?

    And the second problem is as the distributor is at the moment set at total advance of 36 degrees my initial timing is WAY WAY out after TDC.

    Will lighter lighter distributor advance springs go along way to fixing both problems ? ? ?

    Cheers,
    Mike
     
  2. mikealston2428
    Joined: Jul 2011
    Posts: 203
    Likes: 1, Points: 18, Legacy Rep: 10
    Location: aussie

    mikealston2428 Senior Member

    Sorry should have been 2500rpm-3000rpm
     
  3. Dave T
    Joined: Sep 2011
    Posts: 250
    Likes: 14, Points: 18, Legacy Rep: 158
    Location: Anamosa Iowa and North Buena Vista on the Mississi

    Dave T Senior Member

    To set the timing you should have the vacuum advance disconnected only when you set the initial timing at the specified idle RPM probably 6 degrees BTDC. To check the total advance the vacuum advance should be connected. Make sure the vacuum advance hose is connected to above throttle vacuum.
     

  4. gonzo
    Joined: Aug 2002
    Posts: 14,978
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    Location: Milwaukee, WI

    gonzo Senior Member

    Unless that engine is in a car, get rid of the vacuum line. It is only there for the variable loads encountered on the road. Then set the timing to 8-10 BTDC at idle.
     
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