To Sniper or not to Sniper...?

[dmjlambert]

Originally Posted by pjmoreland

...
4) Optional ignition timing control

How does the ignition timing control work? Does it require a special distributor with electronic gizmos in it, or does it control the timing by varying vacuum going to the can on the distributor? Some sort of knock sensor required?

[pjmoreland]

Originally Posted by dmjlambert

How does the ignition timing control work? Does it require a special distributor with electronic gizmos in it, or does it control the timing by varying vacuum going to the can on the distributor? Some sort of knock sensor required?

Holley sells a distributor called the Hyperspark that is designed to work with the Sniper. It is actually a very simple distributor with no vacuum advance or mechanical advance. It just has a sensor that detects the orientation of the rotor and sends its readings to the Sniper. The Sniper adjusts the timing as it sees fit by controlling the angle at which a spark pulse is sent through the ignition system. The rotor/cap can conduct spark pulses within a fairly wide angle range (the rotor doesn't have to be perfectly aligned with the cap contacts). There is no knock sensor.

[Burnsy01]

Originally Posted by pjmoreland

Holley sells a distributor called the Hyperspark that is designed to work with the Sniper. It is actually a very simple distributor with no vacuum advance or mechanical advance. It just has a sensor that detects the orientation of the rotor and sends its readings to the Sniper. The Sniper adjusts the timing as it sees fit by controlling the angle at which a spark pulse is sent through the ignition system. The rotor/cap can conduct spark pulses within a fairly wide angle range (the rotor doesn't have to be perfectly aligned with the cap contacts). There is no knock sensor.

Also adding that if you have a MSD distributor you can convert it over fairly easy

[Rust_never_sleeps]

Failed to mention in my previous post that swapping a 'lectric choke onto a q-jet can simplify things, particularly since you mention cold start problems

[suburban99]

With the price of fuel up here at $1.60+ liter some sort of fuel injection makes sense. My '72 went from 13mpg to 19mpg when I LS swapped it. I thought about the sniper before I took the plunge. I saved the 350/350 in case I ever sell it. (unlikely)..