Timing
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New User
Joined: Jul 2001
Posts: 4
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Timing
Hi all,
67' F-100, 390, C-6
My engine has about 4300 mi. and sounds tough when I hit the throttle in park, although; I beleave I am having a detination problem. It makes a quite disturbing sound when I juice it off the line. My friend, who is more knowledgeable than I, says that is what it is.
I have read most of the forums regarsing timing and have tried to imulate some off the suggestions to no avail.
My innitial is 10* BTDC with or without the advance connected. I put the advance line back on the distributor and manually accelerated the engine and it went beyond 40* BTDC. I switched from ported to full manifold and it made no differance. I dont know if I understand that topic. I will get back to that in a minute. The only other thing I know to do is to adjust the advance. Long story short I ended at 6* BTDC with about 16* advance with a total of 22*BTDC. Still have detination off the line. What is going on?
Thank you
Kyle
67' F-100, 390, C-6
My engine has about 4300 mi. and sounds tough when I hit the throttle in park, although; I beleave I am having a detination problem. It makes a quite disturbing sound when I juice it off the line. My friend, who is more knowledgeable than I, says that is what it is.
I have read most of the forums regarsing timing and have tried to imulate some off the suggestions to no avail.
My innitial is 10* BTDC with or without the advance connected. I put the advance line back on the distributor and manually accelerated the engine and it went beyond 40* BTDC. I switched from ported to full manifold and it made no differance. I dont know if I understand that topic. I will get back to that in a minute. The only other thing I know to do is to adjust the advance. Long story short I ended at 6* BTDC with about 16* advance with a total of 22*BTDC. Still have detination off the line. What is going on?
Thank you
Kyle
New User
Joined: Feb 2002
Posts: 8
Likes: 0
From: chehalis usa
Timing
What kind of carb are you running and what do you know about it? I take it the engine was rebuilt not long back. Did you do it or have someone else dp it? I would suggest you take a look at your float setting, maybe it got knock off its setting during rebuild.you gotta love those
carb problems. B
carb problems. B
Thread Starter
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New User
Joined: Jul 2001
Posts: 4
Likes: 0
Timing
The carb is a out of the box Edelbroc 650cfm. The rebuild was done by Austin quality engine exchange. I picked up a block and heads wrapped in plastic, I put the rest together. It runs great once I build some rpm's in 1st. I just cant punch it from a stand still or it will knock very loud.
Post Fiend
Joined: Sep 2000
Posts: 8,238
Likes: 3
From: Oregon
Timing
how long has this been happening? at 6 btdc with 22 in total, that shouldn't cause any detonation from too much timing. Is bad gas possilbe? I'd try a switch to some hi-test from a different station if your sure it is indeed detonation.
Post Fiend
Joined: Sep 2000
Posts: 8,238
Likes: 3
From: Oregon
Timing
Assuming everything else on your engine is functioning properly, it should be able to handle up to @38 total. I'd leave it the way it is for now though and see if the gas makes a difference...only change one thing at a time. Let us know what happens and we'll take it from there. Hopefully you bought the gas at a different station then usual...
Cargo Master
Joined: Jul 2000
Posts: 2,281
Likes: 18
From: Northern California
Timing
>My innitial is 10* BTDC with or without the advance connected. I put >the advance line back on the distributor and manually accelerated >the engine and it went beyond 40* BTDC. I switched from ported to >full manifold and it made no differance
That shouldn't work that way, the timming should not move. The port that you connect the vac adv to should be a timmed port, it should have zero vac at idle, then jump up as you tap the throttle, then go back to zero.
Your timming seems fine, I'd remove the vac adv and run it with out it. Plug the vac ports on the carb and see how it runs.
IF you still get ping, I'd back the timming until you don't get any pinging, then look at where the timming is.
Check the condition and heat range of the plugs and proper gap.
If the problem is still there, look for the carb to out of adjustment or in need of different jets.
Pinging usually happens more under load on warm days.
I'd also consider that maybe it's NOT pinging, but deal with it as if it were pinging for now.
That shouldn't work that way, the timming should not move. The port that you connect the vac adv to should be a timmed port, it should have zero vac at idle, then jump up as you tap the throttle, then go back to zero.
Your timming seems fine, I'd remove the vac adv and run it with out it. Plug the vac ports on the carb and see how it runs.
IF you still get ping, I'd back the timming until you don't get any pinging, then look at where the timming is.
Check the condition and heat range of the plugs and proper gap.
If the problem is still there, look for the carb to out of adjustment or in need of different jets.
Pinging usually happens more under load on warm days.
I'd also consider that maybe it's NOT pinging, but deal with it as if it were pinging for now.
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