I swapped a TB IV for Delco EST ignition system.

I would like to know what the advance curve for the V8. Is it the same as the L4 and V6? What should be the base timing be set at?

It's supposed to have 22* of advance at 2800 RPM. With *8 of base, that would give me 30* at 2800 RPM.

I think somethin's screwy. I set the timing advance for 20* to see where that would be, RPM wise(to get an idea of the advance curve). It hit 20* at 1450 RPM. Sounds a bit much to me.

Can anybody give me as much info on the EST and set-up and advance curves as they can...or links I could try.

I spent the whole week Googling every possible way of asking about the Delco Voyager EST ignition system.

I got Butkus!


Thanks,
Charlie

you need to post the motor info. what engine and is it stock or modified?

1978 24' searay that weighs 7600 lbs so I had to put a 406 in it and swap the alpha for a BII.

Followed Dennis Moores reccomendation on the build using vortec heads.(from the SBC book). keeping quench to .041(decked .017(?) and dish pistons to keep compression to 9.1:1.

Performer intake with holley 4175(spreadbore)

Pushed the cam a bit with XM 262-12

.463/.477 lift
262/268 duration at .006
19/62 intake
66.21 Exh
Stock center line 110* but advanced 4* to lower torque peak.

Custom built SS exhaust/riser/muffler system with raw water mixing with exhaust 26" past Ex manifold just before thru-transom. Weight of boat puts engine low to the water line.

This is a fishing boat so gotta be quiet.

http://www.mtboats.com/mercuryigniti...cemodules.html. Also read this link.http://www.offshoreonly.com/forums/g...=advance+curve

What do you total timing to be?????? IMO, 32-34* should be fine.
Rev it up until it stops advancing and set it to 32-34*. You can then see what rpm it fully advanced at. It really doesn't matter that much. For a performance engine, you want the timing in quicker. It will also idle better with more base timing.

I've been told the 28* for regular gas (87 octane).

I expect to have total advance of 28-30*.

I would like to see a graph of the advance curve with the recommended base tining to check how accurately the module is to specs.

I have those dist in my gibson, they have about 20 deg advance, when you unplug the timing connector and flip over takes it away to set initial, but you are better off setting total about 28-30 total and let the base end up wherever..they work pretty good, but the module is different from a car/truck so don't swap one of those in later as the advance does not work...Rob

EZ,
I'm curious. The separate plug-in for setting initial timing doesn't work. All I'm showing is about 8* when in normal running mode. I tried to set total timing with the idle timing at 8* but at 3000 RPM it only came up to 24* which would seem to give me a total of 14* of advance...of course I don't know how it's supposed to advance.

the timing connector is a 2 wire, that you unplug flip over and re-connect to time, has arrow and time and run on it, one of my modules(same part #) has 2 deg less timing than the other, but it seems when you fo back to the "run" connection that it just goes to full advance as soon as the engine starts, which is fine at the timing we are running here...

That's definitely different than mine. There are two plug-ins for the module. One for setting base timing with both white wires connected and a black wire that's supposed to go to a Pos batt connection.

The other plug-in is just a blank plug to protect the module connections for a NON shift interrupt drive.