Spark Delay Valve question
Posting Guru
Joined: Dec 2003
Posts: 1,205
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From: Ontario
That would be very helpful to me.
Originally Posted by psquare7575
I'm actually going to work on a sort of 'universal' vacuum diagram.
I suspect some of this stuff might be useful, if only people knew how to hook it up.
-The ported vacuum switch that gives the distributor full vacuum when the temp goes over 245 degrees seems useful.
-charcoal vapor can hookup
- The vacuum setup for the air cleaner. Some seem to have a check valve, while others do not.
- The spark delay valves
Anyone ever try to come up with something like this before, from a performance standpoint? Some charcoal boxes have 2 some 4 ports. I wonder which is easier/best used from a pure performance (I don't want gas stink) standpoint, regardless of original application.
Lots of the performance EGRs don't have a provision for an EGR, it seems any vacuum diagram I find, has an EGR and I'm not sure how it'd be removed.
I suspect some of this stuff might be useful, if only people knew how to hook it up.
-The ported vacuum switch that gives the distributor full vacuum when the temp goes over 245 degrees seems useful.
-charcoal vapor can hookup
- The vacuum setup for the air cleaner. Some seem to have a check valve, while others do not.
- The spark delay valves
Anyone ever try to come up with something like this before, from a performance standpoint? Some charcoal boxes have 2 some 4 ports. I wonder which is easier/best used from a pure performance (I don't want gas stink) standpoint, regardless of original application.
Lots of the performance EGRs don't have a provision for an EGR, it seems any vacuum diagram I find, has an EGR and I'm not sure how it'd be removed.
And if you wanted to PM me when you have it completed that would be great.
TIA Rick.
Fleet Mechanic
Joined: Feb 2006
Posts: 1,393
Likes: 5
From: MA
http://i9.photobucket.com/albums/a72/psquare75/Truck/testdiagram1.jpg
This diagram is what I have made up so far.
Charcoal can, snorkel style air cleaner with a cold weather valve (Not sure what that does?)
Also the vaunted "coolant feature" using a PVS. I suspect this switch should be in the manifold, and not on the thermostat housing.
I'm still not 100% sure what the effect of the spark delay valve would be on a performance oriented high compression engine. vacuum drops at WOT instantly, valve may stop that drop as seen by the distributor?
This diagram is what I have made up so far.
Charcoal can, snorkel style air cleaner with a cold weather valve (Not sure what that does?)
Also the vaunted "coolant feature" using a PVS. I suspect this switch should be in the manifold, and not on the thermostat housing.
I'm still not 100% sure what the effect of the spark delay valve would be on a performance oriented high compression engine. vacuum drops at WOT instantly, valve may stop that drop as seen by the distributor?
Last edited by psquare7575; Jan 28, 2008 at 01:16 AM.
4wd Low
Joined: May 2018
Posts: 11
Likes: 2
Those spark delay valves (vacuum delay valve, etc) are handy in a number of applications. Putting one on the ported advance line of the distributor is the first. It prevents the diatributor from going all wacky when you lift, or change gears, etc. No harm running one and a few benefits. Another is EGR: you want this to ease open even as ported vacuum is engine speed related, downshifting or on and off the gas in traffic is a good example why tied want the EGR to be slightly delayed in activating and it could get rid of off idle bogs associated with EGR valves working. Another is putting one on a vacuum guage if your looking for absolute manifold vacuum average and not the wiggles of an intake gasket, stuck valve or other rhythmic issues. Use one when dialing in your mixture screws, turn a screw wait 3-5 seconds and keep doing this until you get no more change in the screw position. They can be installed either way to function as desired but usually you want the restricted suction side toward the intake to slow the vacuum application to the load diaphragm. Some have an arrow that points to vacuum source. Others work backwards: allow the load to retract slowly like in a distributor where you want the vacuum advance to hang in for 1-2 seconds after you let up for some reason. Color codes can be solid (green in my app) or 2 colors to denote time delay or direction of operation. "Remove all that smog crap" is not a constructive response and I wish folks would quit using that over used answer to specific device operation related questions.
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