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Location: Fairfax, Minnesota | I have a spring and weight kit for modifying the advance curve. It came with no documentation. I have no experience. Can anyone tell me which spring set is weak, medium, and heavy? The colors are black, brass and silver. I realize that it may be nessasary to try all three to get where I want to be, but it would make it easier if I knew which way I was headed when I made a change. This image appears to be the same kit that I have.
Edited by Ray 2015-04-02 11:59 PM
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Expert 5K+
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Location: WHEELING,WV.>>>HOME OF WWVA | the more finer the wire , the weaker -----------------------------------------later |
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Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!
Posts: 19146
Location: bishop, ca | YUP, and you want to install the two lightest weight springs, in your distributor, to ensure the quickest
timing-advancement rate.
(and, THEN, there's the matter of the dissie's built-in (or: modifiable) Mechanical
Advancement, and its (hopefully-) adjustable Vacuum Advancement)
Edited by d500neil 2015-04-04 7:55 PM
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Expert
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Location: Fairfax, Minnesota | d500neil - 2015-04-04 6:51 PM YUP, and you want to install the two lightest weight springs, in your distributor, to ensure the quickest timing-advancement rate. (and, THEN, there's the matter of the dissie's built-in (or: modifiable) Mechanical Advancement, and its (hopefully-) adjustable Vacuum Advancement) The kit came with weights- mechanical advancement? Hmmm.. I know nothing about adjustable vacuum advancement- tell me more. Thanks |
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Board Moderator & Exner Expert 10K+
Posts: 13045
Location: Southern Sweden - Sturkö island | Actually, trial and error will take a long time, first thing is to ask yourself what you want; good oem driveability and good fuel economy or preformance and quick response.
For to set a distributor properly, you need a distributor test bench and a guy who knows about this stuff.
Sometimes even a mix of springs could work to your benefit.
The adjustable vacuum chambers are identified by the neck that has a threaded insert where you could djust the maximum stroke of the membrane.
Vacuum advance is primarily used in an effort to improve economy, therefore you won’t hear much about vacuum advance when discussing performance and racing. There is little to no vacuum during wide open throttle which means no vacuum advance any way!
A vacuum advance canister provides a way to advance the ignition timing during moderate and part throttle conditions. This is when the load on the engine is less and vacuum is higher. There is a diaphragm inside the canister which is connected to a linkage connected to the pickup plate in the distributor. When vacuum is applied, the plate is pulled which advances when the trigger signal is created. When the engine accelerates, vacuum drops so the advance returns to the original position.
When connecting the vacuum advance, most applications connect to a port above the throttle plates. This is called ported vacuum compared to manifold vacuum which comes straight from the intake manifold. The difference here is that manifold vacuum is there constantly while the ported source provides vacuum only when the throttle blades are open. The amount of advance that occurs varies by application but generally ranges from 10°-15°. Some companies even offer an adjustable vacuum advance canister. This lets you set the exact amount of vacuum advance that your engine requires.
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Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!
Posts: 19146
Location: bishop, ca | Like Wiz said, you/we need to dial in our cars' distributors using a (typically:) Sun Analyzer machine.
As a non-racing(!) protocol, merely having your dissie-doctor replace your dissie's two (heavier-weight) OEM
return springs, with two light-weight return springs, will serve very nicely in increasing your
dissie's RATE of timing advancement, for better acceleration and for better MPG.
Obviously, there will be a 'perfect' set of return springs for your/our car's distributor applications....but, only your
dissie doc will be able to advise you on that subject.
It is well enough done, that a pair of light-weight return springs have been retrofitted into our timing systems.
Edited by d500neil 2015-04-12 5:58 PM
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Posts: 316
| that looks like an HEI kit not a mopar kit to me. |
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Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!
Posts: 19146
Location: bishop, ca | The spring (-sizes) i.e.: WEIGHTS/strengths.... are what is/are important, in adjusting the RATE of timing adjustments,
in a distributor.
If your subject return spring(s) fit to the tabs in your dissie's body, those springs will 'fit' to your dissie, BUT,
you (....your distributor-shop) will need to experiment (using a SUN Analyzer machine...) using various weights,
to obtain the best performance from your distributor, from its internal Mechanical Advancement, and from
its vacuum advancement adjustments .
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Expert
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Location: Ontario, Canada | I bought one of those machines many years ago. Sent it back to have it re calibrated. Bought a huge grab bag of those dist springs. Sold the machine but still have a bunch of springs. Anyone want them? They are cheap, cheap!!
Greg |
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Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!
Posts: 19146
Location: bishop, ca | PIX?????
Size (of springs...see above) MATTERS!
The springs (if various sizes/weights)...ARE valuable.
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Expert 5K+
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Location: WHEELING,WV.>>>HOME OF WWVA | if one bought an advance timing light , would one have to worry about springs ------------------------------------------------later |
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Expert
Posts: 1906
Location: Ontario, Canada | The timing light just shows advance at any specific RPM. The springs control the advance at any specific RPM after the base timing (dist.position ) has been established.
Really, Neil, want me to dump these suckers onto a sheet of paper for pix?
Greg |
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Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!
Posts: 19146
Location: bishop, ca | ..Well, the 'film' is free.
Just segregate the springs into their various sizes/types, for demonstration/illustration purps.
Easy-peasy.
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Expert
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Location: NorCal | Polybun - 2015-05-31 2:11 PM
that looks like an HEI kit not a mopar kit to me.
Yup, "under the rotor" GM parts but the OP didn't state which distributor he has. It ain't that hard to type the whole word. |
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Expert
Posts: 1906
Location: Ontario, Canada | Not as much of an assortment as I thought. Lots of the ones on the left but this is all of the medium and light ones.
Greg
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| 57chizler - 2015-06-08 11:46 AM
Polybun - 2015-05-31 2:11 PM
that looks like an HEI kit not a mopar kit to me.
Yup, "under the rotor" GM parts but the OP didn't state which distributor he has. It ain't that hard to type the whole word.
it just makes me worry that he got those things at some parts store thinking they will work with a mopar distributor, and they don't. You could put the strongest set in a mopar distributor and you would still have full advance at 1000rpm. I just kind of hope the guy knows this. |
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Location: Fairfax, Minnesota | Polybun - 2015-06-08 7:54 PM 57chizler - 2015-06-08 11:46 AM Polybun - 2015-05-31 2:11 PM that looks like an HEI kit not a mopar kit to me. Yup, "under the rotor" GM parts but the OP didn't state which distributor he has. It ain't that hard to type the whole word. it just makes me worry that he got those things at some parts store thinking they will work with a mopar distributor, and they don't. You could put the strongest set in a mopar distributor and you would still have full advance at 1000rpm. I just kind of hope the guy knows this. Yep, got them at a local speed shop; bag with no label. . Although I used a stock photo that I found on the web, it looks very close to what I have. I have a 62 alumuminum mopar distributor. Where should I go to insure I get the correct spring kit. How do the Mopar kits look different from what I have? Thanks |
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Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!
Posts: 19146
Location: bishop, ca | I think that some or all of those return springs could fit and/or work with an AutoLite distributor.
But, at any rate, the entire dissie, and the misc. return springs, will need to be sent to a dissie doctor
(like: The Philbin Group..) for a complete overhaul of its internal working-equipment
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| Ray - 2015-06-08 7:54 PM
Polybun - 2015-06-08 7:54 PM 57chizler - 2015-06-08 11:46 AM Polybun - 2015-05-31 2:11 PM that looks like an HEI kit not a mopar kit to me. Yup, "under the rotor" GM parts but the OP didn't state which distributor he has. It ain't that hard to type the whole word. it just makes me worry that he got those things at some parts store thinking they will work with a mopar distributor, and they don't. You could put the strongest set in a mopar distributor and you would still have full advance at 1000rpm. I just kind of hope the guy knows this. Yep, got them at a local speed shop; bag with no label. . Although I used a stock photo that I found on the web, it looks very close to what I have. I have a 62 alumuminum mopar distributor. Where should I go to insure I get the correct spring kit. How do the Mopar kits look different from what I have? Thanks
Mopar performance sell a kit. The gm HEI stuff will fit in there but the advance weights are much much much lighter in an hei distributor and therefore take much weaker springs. Put those in a mopar distributor and it'll just go full advance at idle. Anyone that tells you they will work at all is an idiot. |
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Expert
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Location: NorCal |
The Mopar advance weights bear no resemblance to the ones shown here.
The Mopar Performance spring kit consists of only two springs so you don't get any variety to experiment with. |
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Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!
Posts: 19146
Location: bishop, ca | I'm seeing advance-springs of varying strengths/weights, above.
The Hemi/Polys use Autolite-brand dissies, whose maximized proper-efficient operation
require the use of a SUN-brand distributor-analyzer/adjuster machine, to evaluate
and to dial-in the dissie's performance, in Re: these parameters:
Dual points?
(Pertronix-) Electronic Ignition?
(Internal-) Mechanical-Advancement adjustment ("Re-curving")
Light-weight return-springs
(Operational?) Vacuum-Advance adjustment
Edited by d500neil 2015-06-09 5:47 PM
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Advance curve spring color code
