Jump to content

You’re an Old Fart if…


BKistler
 Share

Recommended Posts

  • Baller
4 hours ago, Zman said:

And, still have the dwell meter. (why, I don't know)

lol, I've got one in the garage. Not used it for over 20 years.

Also got a colortune (which I used 2 years ago tuning an LPG v8 and melted the plastic cover 🙄 )and a carb balancing kit plus an electronic ignition conversion for a 1960s triumph herald for some reason?!

Link to comment
Share on other sites

  • Baller
10 hours ago, Taynton said:

whats a dwell meter for lol

In case you were seriously asking used to be that your spark plugs were fired by a switch called the points that lived inside the distributor, when they close the coil is grounded and charges up with electricity and when they open the electricity jumps out of the coil through the wires to the spark plug.  The dwell meter measured the number of degrees of rotation that the points were closed.  So if you have a V8 the rotor in the distributor turns 1 time for every time all 8 cylinders spark 1 time.  So 360 degrees divided by 8 means every 45 degrees of rotation the points open and a spark fires.  But they take a few degrees to open and close so the spec would be something like 25-30 degrees so you'd whip out the dwell meter and the timing light and you'd get your dwell to spec by adjusting the points using the dwell meter  and then you'd retime the engine.  

Fun stuff.  But there were always two types of people the dwell meter and the feeler gauge.  I've always been a dwell meter user and my dad's in the feeler gauge camp.  In both you're trying to adjust the points to open enough for a clean spark but closed long enough to charge the coil.  (dwell meter is clearly better)

 

Nearly every ski boat moved off points by the mid-90s.  MC I think went electronic from the factory somewhere around 90/91.

  • Like 1
Link to comment
Share on other sites

  • Baller
On 7/12/2023 at 11:43 AM, BraceMaker said:

In case you were seriously asking used to be that your spark plugs were fired by a switch called the points that lived inside the distributor, when they close the coil is grounded and charges up with electricity and when they open the electricity jumps out of the coil through the wires to the spark plug.  The dwell meter measured the number of degrees of rotation that the points were closed.  So if you have a V8 the rotor in the distributor turns 1 time for every time all 8 cylinders spark 1 time.  So 360 degrees divided by 8 means every 45 degrees of rotation the points open and a spark fires.  But they take a few degrees to open and close so the spec would be something like 25-30 degrees so you'd whip out the dwell meter and the timing light and you'd get your dwell to spec by adjusting the points using the dwell meter  and then you'd retime the engine.  

Fun stuff.  But there were always two types of people the dwell meter and the feeler gauge.  I've always been a dwell meter user and my dad's in the feeler gauge camp.  In both you're trying to adjust the points to open enough for a clean spark but closed long enough to charge the coil.  (dwell meter is clearly better)

 

Nearly every ski boat moved off points by the mid-90s.  MC I think went electronic from the factory somewhere around 90/91.

And if I recall, dwell angle, point gap affects the timing, but timing does not affect dwell, point gap. From memory, helping the 'ol man tune our '68 Ford with a very healthy 390 V8.

Link to comment
Share on other sites

  • Baller
35 minutes ago, 2Valve said:

And if I recall, dwell angle, point gap affects the timing, but timing does not affect dwell, point gap. From memory, helping the 'ol man tune our '68 Ford with a very healthy 390 V8.

Correct since the timing of the actual spark relates to the gap opening up far enough that the spark plug gap is more attractive than the points gap.  Points set to open less have more angle and will spark a bit later than ones set to open more but they if they open more they close later which means lower dwell and less charging so you have to balance the both.

While I'm a dwell tiger is you can monitor changes in the points by monitoring the dwell angle over time.  Where as when you cannot measure points gap while its running.

Link to comment
Share on other sites

  • Baller

@ALPJr and the matchbook cover to set the points gap. Double it over to set the plug gap..

Also skied behind and drove a 50 something 70 hp Merc with no neutral or gear case.  Started in gear with button under the throttle handle. For reverse pulled back to center to kill, then into reverese, hit the button, whole engine turned opposite direction. 

Edited by ETskier
Spelling
  • Like 1
  • Haha 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...