351W Timing concerns
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From: Broken Arrow , OK
351W Timing concerns
I ran this round quite a bit a year or so ago. I still haven't gotten the answers I need and I cant figure it out.
I have a roller cam in the motor. It's not aggressive enough to need an adjustable timing set installed. When Gary Lewis and I put a degree wheel on it straight up was where it needed to be. We set the initial timing at 7° BTDC according to the vacuum gauge. It has about 30° over all. The dizzy has a mechanical advance only.
Where the dizzy is at the starter cant hardly turn the motor over to start it. When it does the relay on the firewall smokes and so does the ground terminal on the battery. So that's not right somehow.
I need some suggestions please. I don't know where to go or what to do.
Whenever I back the timing off to 0° or 2° BTDC the motor turns just fine when starting, but pings and diesels as well as wants to keep running when I kill it.
I have a roller cam in the motor. It's not aggressive enough to need an adjustable timing set installed. When Gary Lewis and I put a degree wheel on it straight up was where it needed to be. We set the initial timing at 7° BTDC according to the vacuum gauge. It has about 30° over all. The dizzy has a mechanical advance only.
Where the dizzy is at the starter cant hardly turn the motor over to start it. When it does the relay on the firewall smokes and so does the ground terminal on the battery. So that's not right somehow.
I need some suggestions please. I don't know where to go or what to do.
Whenever I back the timing off to 0° or 2° BTDC the motor turns just fine when starting, but pings and diesels as well as wants to keep running when I kill it.
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From: Broken Arrow , OK
We did and it was on. I am sure about the engine timing right. We used a dial indicator to find absolute TDC of #1 and then like I was saying used a degree wheel to make sure the engine timing was right for the roller cam. So that part is correct.
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From: Broken Arrow , OK
I will check tomorrow. The plugs are almost brand new. They have about an hour or hour and a half of running time on them. The exhaust doesn't really smell rich like burning your eyes. I don't know if the plugs will tell us anything, but I will check a couple.
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From: Broken Arrow , OK
I pulled 1 and 4. They looked fine. Then again there is not a lot of run time or miles on them either.
I am running a procomp dizzy with mechanical advance only and a streetfire ignition module. I don't believe either has a start retard function, but still 7° BTDC shouldn't be doing this.
I am running a procomp dizzy with mechanical advance only and a streetfire ignition module. I don't believe either has a start retard function, but still 7° BTDC shouldn't be doing this.
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From: Earth
What's the factory timing on a 351W? It's got to be 8 or 10° BTDC?
At what timing does it start to push back against the starter? 0-2° is too little, 7° is too much then maybe 3-5° is the spot.
There's something very screwy going on. Have you checked the internals of the dizzy to see if anything is sticking or out of place?
How much vacuum are you pulling at 7° and at 0-2°?
At what timing does it start to push back against the starter? 0-2° is too little, 7° is too much then maybe 3-5° is the spot.
There's something very screwy going on. Have you checked the internals of the dizzy to see if anything is sticking or out of place?
How much vacuum are you pulling at 7° and at 0-2°?
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From: Broken Arrow , OK
I haven't checked the internals of the dizzy, but they are certainly suspect right now. I don't trust the brand of the dizzy and I am about to just go back with a new DSII set up and ditch the aftermarket dizzy and module. Then I will report back.
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From: Houston
What's the factory timing on a 351W? It's got to be 8 or 10° BTDC?
At what timing does it start to push back against the starter? 0-2° is too little, 7° is too much then maybe 3-5° is the spot.
There's something very screwy going on. Have you checked the internals of the dizzy to see if anything is sticking or out of place?
How much vacuum are you pulling at 7° and at 0-2°?
At what timing does it start to push back against the starter? 0-2° is too little, 7° is too much then maybe 3-5° is the spot.
There's something very screwy going on. Have you checked the internals of the dizzy to see if anything is sticking or out of place?
How much vacuum are you pulling at 7° and at 0-2°?
Start up is just fine at this setup.
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