330hp_91RS

I just wanted to know what the max base timing would be until a motor would ping. I am going to do an experimanet here. It's possible that my cam is not indexed properly.

I usually set my base timing to 12 degrees, but the motor doesn't respond like it should. You can't always trust a balancer or timing marker. My balancer is new and timing markers don't move so..... I'm gonna try to eyeball whatever figure you guys give me and advance it that much. I was thinking that 16-18 degrees of base timing should make a car ping like a bastard, providing the distributor is set so that total timing is 36 degrees at base timing of 12 degrees (24 degrees of distributor advance.) That would give me 40-42 degrees of total timing.

RB83L69

It varies from one motor to another. Every motor is different, once they've been modified. Just experiment. Set it to where it runs, advance it a little and see if it pings, if not, advance it some more, etc. until it pings, then back it off until it quits.

330hp_91RS

I need experienced, educated guesses.

Look at my sig for the 91' and tell me what you guys think.

Ukraine Train

advance your timing til you hear ping and then back it off a few degrees. i've been running aout 16 on my engine with no problems, if it's below 12 it'll diesel

Sitting Bull

RB gave you the BEST advice anyone can give! It is the old "ear method" and it works every time

Keep moving it counterclockwise. Take it for a hard spin. If it pings move the distibutor a couple degrees clockwise. If it doesn't, just keep going counterclockwise until it does, and then take two degrees out.

My 305 has 18* of initial advance but is a vacuum setup. Most cc distributors are set around 4* to 6* at the factory but you can go further than that

gruveb

It's subjective. Every single one is different. I found that I didn't ping until 10* or so, but felt a that the car ran a little better at 6* Conservative I know, but the car starts and shuts off better and doesn't get as hot.

So the only way you can tell is to start at say 8* and work your way up.

But for someone to say it won't ping unti 10* is just foolish advice!

gruveb

Just shows you how different one engine can run from another. I have an 84 Z, L69. Comp Cams XE 262 cam, Weiand Action plus intake, edelcrap 600 carb, Jacob's prostreet ignition, and some other junk in there, but basically that shows you how different things can run.

I'm sure that your cars are awesome, but get a website. There's no need for a signature that long, especially when it is listed after every post!

Get a website and have your signature be the link.

330hp_91RS

Gruevb:

I have a very similiar setup on my 84' w/L69. I run 12 degrees of base timing and 22 degrees of distributor advance.

You were pinging with 10 degrees??? How much Distributor advence u got??????

gruveb

I was pinging at 10* under certain conditions, and at 12, pretty consistently under part throttle.


Not sure exactly what my total advance is as I've just got a cheap timing gun.