Continuing ignition timing debate from the 416 thread.

[Newbomb Turk]

7AL-3 box, W8 heads

I haven’t rested a 7AL-3 box yet. At 8k 30 is probably a little slow BUT we don’t know how far it is retarding.

At what rpm are you setting the timing?

 

[9secRR]

I haven’t rested a 7AL-3 box yet. At 8k 30 is probably a little slow BUT we don’t know how far it is retarding.

At what rpm are you setting the timing?

Set it at idle and also checked at 4500.

 

[Newbomb Turk]

Set it at idle and also checked at 4500.

Does it change from idle to 4500?

It’s a bit more difficult to catch with a timing light because they all have their own slew rate. If you can do it (I can but I get a bit sweaty when I do it) you can run the engine to say 7k and see what you get.

Another thing you can do is get 3-4 timing lights and check them all at idle and the light that shows the LEAST amount of timing has the fastest electronics and the least slew rate.

I had a light go wonky a few weeks ago, for no apparent reason. I’d make a timing change and the engine would act like I went the wrong way. I got to looking at it and took the light to an engine I have in a car (not on the dyno) that I knew I had the timing where I wanted it and it showed I had 8 degrees of initial on it when I knew it had 25.

So I **** canned that one and bought a very nice Craftsman light from @halifaxhops and it works and I trust it.

 

[9secRR]

Does it change from idle to 4500?

It’s a bit more difficult to catch with a timing light because they all have their own slew rate. If you can do it (I can but I get a bit sweaty when I do it) you can run the engine to say 7k and see what you get.

Another thing you can do is get 3-4 timing lights and check them all at idle and the light that shows the LEAST amount of timing has the fastest electronics and the least slew rate.

I had a light go wonky a few weeks ago, for no apparent reason. I’d make a timing change and the engine would act like I went the wrong way. I got to looking at it and took the light to an engine I have in a car (not on the dyno) that I knew I had the timing where I wanted it and it showed I had 8 degrees of initial on it when I knew it had 25.

So I **** canned that one and bought a very nice Craftsman light from @halifaxhops and it works and I trust it.

it stayed at 30* from idle to 4500. i will do the 7000 rpm test next spring before the season starts.