Re: TDC Question
[Re: 6PAX]
#3168555
08/17/23 02:43 PM
08/17/23 02:43 PM
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Joined: Jan 2003
Posts: 16,934 NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,934
NC
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Looking at the top two pictures, would you say cylinder #1 or #6 is on TDC? With the balancer set on TDC, the top pic are the lifters for #1 and the bottom for #6. Top two pics, #1 is firing and #6 is on overlap. It should be even more obvious 20-30 degrees after TDC on the balancer/timing marks; the cylinder on overlap will have the intake opening.
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Re: TDC Question
[Re: 6PAX]
#3168561
08/17/23 03:00 PM
08/17/23 03:00 PM
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Joined: Oct 2007
Posts: 4,213 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,213
New York
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Both are @ TDC: one is firing and the other is on OL. Every 360 degrees they switch
Boffin Emeritus
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Re: TDC Question
[Re: 440Jim]
#3168809
08/18/23 01:44 PM
08/18/23 01:44 PM
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Joined: Jan 2003
Posts: 16,934 NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,934
NC
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It should be even more obvious 20-30 degrees after TDC on the balancer/timing marks; the cylinder on overlap will have the intake opening. This Comp Cams diagram might help you visualize what I said.
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Re: TDC Question
[Re: B1MAXX]
#3169099
08/19/23 09:14 PM
08/19/23 09:14 PM
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Joined: Jan 2003
Posts: 31,114 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,114
Oregon
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Agreed I just take it one more step, after pointing the rotor at the right tower I fine tune the reluctor to line up. Yah, having a reluctor makes it a little more difficult. Back in the old days when I ran electronic ignition I would machine additional slots in the reluctor so I could fine tune the rotor phasing. That was actually a requirement for some performance engines with vacuum advance. The factory reluctor position wouldn't work on some combinations. I had forgotten about that since I haven't used a reluctor based ignition system in 20 years.
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Re: TDC Question
[Re: B1MAXX]
#3169159
08/20/23 10:17 AM
08/20/23 10:17 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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not a dealbreaker but I would run the plug wires in the OE order around the cap which lets em lay the neatest with the shortest lengths possible. this might help prevent a future mistake. EDIT this would be the #1 plug wire in the cap facing the front of the engine on a SB and at the 5 o'clock position looking over the pass fender on a BB. you can reclock the intergear to get it where you want it. be sure to check rotor phasing & with no vac adv I want it dead centered and with vacuum advance I want the trailing edge of the rotor tip at the trailing edge of the cap terminal as vac adv will pull it back against rotation as only vac adv not mechanical advance changes phasing. You can redrill the reluctor with a mini drill bit then break the edge out with a mini file to reclock the roll pin in the reluctor to change phasing and Echlin has a rotor with a longer blade (MO3000 iirc) that will help reduce the gap.
Last edited by RapidRobert; 08/20/23 12:25 PM.
live every 24 hour block of time like it's your last day on earth
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Re: TDC Question
[Re: B1MAXX]
#3169195
08/20/23 01:07 PM
08/20/23 01:07 PM
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Joined: Feb 2015
Posts: 2,086 CA
crackedback
top fuel
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top fuel
Joined: Feb 2015
Posts: 2,086
CA
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Where the slot in that drive goes is dependent on the distributor. MSD's have been known in some engines to be miles off with rotor direction/#1 tower when the drive is installed per the manual.
I usually identify where I want the #1 tower on distributor, figure out where the tang is pointing, get drive dropped in. Then when ready to fire it up and wired, hook up a timing light on #1 wire, timing mark in 15-20 BTDC area. On a BB turn housing counter clockwise, turn on ign, and twist housing slowly back clockwise watching for the flash. Should be very close to timed up.
Last edited by crackedback; 08/20/23 01:11 PM.
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