Help, what is the timing setting for a 3.9 V8i

[aka_db]

Hey all,

I have looked at the workshop manual and the owners handbook. Both have different settings for the ignition timing. Manual says 2deg BTDC and the Handbook says 6deg BTDC, which is correct, or do I just have to trial and error till I get it performing correctly?

Also, is there a special spanner designed to undo the distributor lock bolt, what a pain to get at...

Cheers, db.:confused:

[langy]

The variation has to do with whether or not you have a low compression (8.13:1) or High compression ( 9.35:1) engine, or whether or not it's a catalyst model ( with O2 sensors in the exhaust system), and if you run it on gas, the setting is different again.

Basically, start with 2 degrees and see how it runs. If it's a little sluggish, bump it up a bit. If it pings (knocks) under load, drop it down a bit.

As to the distributor lock bolt, a longish 9/16 12 pt ring spanner works ok, with the engine off. ( You have to reach thru the fanbelt). You can get a thin walled combination socket/uni joint and a 3/8 extension bar in ok whilst the engine is running if you want to do it that way.

[justinc]

between 6 and 9 degrees is fine for our low compression models, even up to 12 degrees but should run premium if going that far.

JC

[LOVEMYRANGIE]

between 6 and 9 degrees is fine for our low compression models, even up to 12 degrees but should run premium if going that far.

JC

I'm running 12 on std (G)ULP and its fine. Mind you, I do have one of those God awful Dynotec PC216 cams in it too.

[Chops]

Hi guys,,
My vac advance has gone on mine, so a mate and I tuned it via a vacuum guage,, not bad power,,,and heaps better on fuel,, :D but I'm not sure where that has left it degrees wise,, didnt get to check it with a timing gun,,:(

So how do you tell which compression ratio you have?? :confused:

[aka_db]

Hi There,

I have checked what I have set it is currently 2deg and is running quite well. The engine is a low comp. this was found on the block where the engine number is. I need to buy a better spanner so I can undo the locking bolt and will have a play.

Just got it back today from having sequential LPG fitted, seems to run really well. No perceivable difference between LPG and Petrol.

Cheers, db.

[Pierre]

Chops, CR is stamped on the engine number facing beneath the engine number and is probably 8.13.

Pete