C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Yikes ! Distributor cap moving !!

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Old Jul 13, 2006 | 10:34 PM
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Default Yikes ! Distributor cap moving !!

was replacing a burnt wire and was putting the plug on the distributor cap and its moving

I'm not very familiar with distributors so how would i set it? I did notice in the dfi that the timing was off, this is probably why. I do have timing marks on the balancer but the camber brace is in the way atm, i hope i don't have to remove it because i just got it aligned.

Help !!
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Old Jul 13, 2006 | 11:24 PM
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Is the cap moving, or the whole dist. ? What kind of dist. are you using ?
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Old Jul 13, 2006 | 11:35 PM
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I can read my timing mark with the camberbrace on.

The distributor has a hold down clamp with a 9/16" bolt. You may need a bent combination wrench or a distributor wrench (offset box wrench) to get to it.
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Old Jul 14, 2006 | 12:37 AM
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it looks like the cap and the aluminum base is moving. By my best guess.. the rotor is attached to the drive gear that is on the cam? so maybe that isn't moving? It's an accel dual sync. I can see the screws holding the red part to the aluminum base part and they look tight. I had my intake done by LT1intake.com and it included a hold down bolt with a plate. That bolt is loose.

Is the rotor aligned for timing and not the cap ? I'm sort of pissed off the shoppe who built it for me has been brushing me off for 2 weeks now even though theres many small problems that need to be taken care of

I don't have a clue where to set it and tighten the bolt.. or even if that is all that needs to be done. should i remove the cap to see if the rotor is moving ? I did spin the motor to 7900 rpm a few times the night before and am guessing it shook the distributor up. I am not familiar with these so can someone also explain to me what holds the distributor in place? When i first dropped in the dual sync i noticed there was slight wiggle room and it wasn't a perfect fit. I'm worried...

Last edited by DieL; Jul 14, 2006 at 12:41 AM.
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Old Jul 14, 2006 | 12:39 AM
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Originally Posted by CentralCoaster
I can read my timing mark with the camberbrace on.

The distributor has a hold down clamp with a 9/16" bolt. You may need a bent combination wrench or a distributor wrench (offset box wrench) to get to it.
If the top turns though.. where should it be when i tighten the distributor down? It rotates almost an inch each way. I can see the hold down bolt and plate and it's easy to get to. If i do need to read timing or anything to set it (hope i don't), i have a mezzier heavy duty ewp with a camber brace for it. I havn't looked for that but i don't think I can see the balancer from up top.
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Old Jul 14, 2006 | 01:52 AM
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See the plastic covering the wire harness hookup to the coil cover up top?

Align it so that points towards the drivers side of the car, (the 3 oclock position, if the nose of the car is at 6 oclock)

This will be plenty close to drive it. Now get a timing light, and see where you're at on the timing tab. Notice the timing tab markings before you fire it up, the deepest V is 0 degrees. Counterclockwise towards the left is before TDC. The peaks are at 4*, 8*, 12*.

Advance timing by rotating the distributor slowly counterclockwise. Clockwise retards it. I don't know what your base timing should be, maybe 8 degrees.

Don't worry about the cam gear, all is fine. The distributor housing is supposed to rotate when you adjust timing.


I had the distributor come loose on my Ford once, like an idiot I didn't find out for 2 years. It was 20* tdc when I checked it finally, and I'm guessing was moving around all over the place, only being held in place by the electrical harness.

Last edited by CentralCoaster; Jul 14, 2006 at 01:54 AM.
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Old Jul 14, 2006 | 11:14 AM
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Originally Posted by CentralCoaster
Now get a timing light, and see where you're at on the timing tab. Notice the timing tab markings before you fire it up, the deepest V is 0 degrees. Counterclockwise towards the left is before TDC. The peaks are at 4*, 8*, 12*.

Advance timing by rotating the distributor slowly counterclockwise. Clockwise retards it. I don't know what your base timing should be, maybe 8 degrees.
The problem is that Diel is running a dual sync, which I am guessing that he is running DFI (or other aftermarket ECM). With that being said, they are typically timed at 50° as matched to the idle cells.

I may be way off, but that dual sync distributor threw a flag for me. What ECM are you running? If stock ECM, then all of this means nothing.

Aaron
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Old Jul 14, 2006 | 01:08 PM
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Aaron it is a dual sync and a gen 7 ecu. Its not a piggy back but a standalone.. the stock ecu and wiring completely removed. I'll get a pic up of what im looking at .. brb

Sigh took pictures but photobucket is down for a bit. Does turning the cap affect timing? Im guessing the rotor itself is not rotating because its being held in place by the gear drive. the cap and base as a whole is rotating as far as it wants. I have a general idea where it originally was.

im guessing as long as the rotor is in the correct positon.. wouldn;t the spark from it jump to the nearest terminal anyways? so if its in range of the right terminal a few degrees left or right wouldn't make a difference? lol don't laugh at me

Last edited by DieL; Jul 14, 2006 at 01:21 PM.
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Old Jul 14, 2006 | 01:45 PM
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Ok so the cap does affect timing.. here's a pic of what I'm talking about...



The entire distributor that is visible moves as 1 piece left and right. that hold down bolt is loose as well. Im guessing the vibrations loosened it. What in the world prevents this thing from moving left/right even when that piece is tightened down ?? I'm thinking to use a lock washer and threadlock on it
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Old Jul 14, 2006 | 06:00 PM
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I was thinking with the dual sync that you were DFI or FAST. Again, the setpoint tends to be at 50°. You will need to have a marked dampner to measure and a timing light to measure. I would not go "playing" until I had the timing properly set.

That looks like a "mickey mouse" hold down. Go to Jegs/Summit and buy one of their billet units with stud and lockwaher/nut. It wont move again, until you loosen it.

Aaron
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Old Jul 14, 2006 | 07:00 PM
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Do you still have the original distributer hold down?
Some of those billet/chrome hold downs are worthless POS's.
The original one works alot better than most aftermarket ones IMO.
Just take a spray bomb of black paint to hide it or whatever color you want and you got good looking holdown!
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Old Jul 14, 2006 | 07:21 PM
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Originally Posted by DieL
Ok so the cap does affect timing.. here's a pic of what I'm talking about...
I can't see enough of the distributor hold down to call it Mickey Mouse. I can see that the bolt is loose. The bolt tightens against the washer which pushes the fork or yoke shaped hold down onto the flange of the distributor, to keep it from turning.


Originally Posted by DieL
The entire distributor that is visible moves as 1 piece left and right. that hold down bolt is loose as well. Im guessing the vibrations loosened it. What in the world prevents this thing from moving left/right even when that piece is tightened down ??
The hold down bolt "prevents this thing from moving left/right even when that piece is tightened down". Chances are, that it was never tightened, or tightened properly. This is generally not a big problem.

Through the shaft, distributor gears and timing chain (or gears), the rotor is linked to the crankshaft. The spark DOES jump to the nearest cap terminal, but where that terminal happens to be is how you set the timing. Imagine if the case (body) and cap turn far enough, the rotor will be closest to the wrong terminal in the cap. Then the wrong cylinder will fire.

RACE ON!!!
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Old Jul 14, 2006 | 07:30 PM
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This sucks. I have a heavy duty mezziere and a camber brace thats in the way of the damper and the timing marker. Have to remove the camber brace now and it'll probably throw my alignment off that i just had done

Thanks for the input. Getting this sorted out tonight.
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Old Jul 14, 2006 | 07:32 PM
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Removing the Camber-Brace won't affect your alignment.
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Old Jul 14, 2006 | 07:39 PM
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Originally Posted by DieL
was replacing a burnt wire and was putting the plug on the distributor cap and its moving

I'm not very familiar with distributors so how would i set it? I did notice in the dfi that the timing was off, this is probably why. I do have timing marks on the balancer but the camber brace is in the way atm, i hope i don't have to remove it because i just got it aligned.

Help !!
I certainly don't know your car (altho I've seen the fabulous pics!), but why would removal of the camber brace change your alignment? When putting it in my car I didn't expect any changes.

Woops, STL you beat me to the posting!

Last edited by AORoads; Jul 14, 2006 at 11:10 PM.
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Old Jul 14, 2006 | 09:40 PM
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I'm sorry. Did I read right? you spun your engine to 7,900 RPM a few times? (!)
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Old Jul 19, 2006 | 02:33 AM
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Originally Posted by tpiini
I'm sorry. Did I read right? you spun your engine to 7,900 RPM a few times? (!)
yup 7850 is what i set it at to be exact ! Appreciate the help guys. I removed the camber brace and drove her up to the shop and set the timing with the light and tighened the bolt down with an added lock washer. been a few days and so far so good. I had it fairly close when i drove up tp the shoppe and we found it was 6 degrees retarded. funny thing is it droe very very smooth at that setting even chugging in 6th gear at lower speeds. I pulled out timing at lower rpms and part throttle after we set the timing and she drives better now

About the camber brace.. i thought it would have changed the alignment because when its retightened it pulls the frame horns together. I guessed it would have changed because they flexed. Installing it a 2nd time was super easy and i tightened it in the same rder as i removed it. Wheel is still straight as an arrow
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