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Symptoms of Being 1-Tooth Off on Cam Timing


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#1 jonboyb

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Posted 20 May 2008 - 12:36 PM

We were having some discussions around the shop regarding what the symtoms would be if you were 1-tooth off on cam timing in either direction (with a stock cam).  Obviously, the car would be weak whether it's advanced or retarded a tooth, but for those who have been there before, what did you see.

I have a spare adjustable cam gear lying around that I could throw on just to see the results, but that's just extra work and I'd rather just hear from those who have experienced it biggrin.gif
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#2 Whiplash

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Posted 20 May 2008 - 12:51 PM

On some engines the engine won't run. Some engines will run if off a tooth. Don't know which the StarQuest would be.


One tooth advanced would make it more quicker at take-off, but no top end.

One tooth retarded would make it sluggish at take-off, but better top end performance.

This is all by memory, someone will correct me if wrong.
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#3 TainterRacing

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Posted 20 May 2008 - 12:52 PM

QUOTE (jonboyb @ May 20 2008, 01:36 PM) <{POST_SNAPBACK}>
We were having some discussions around the shop regarding what the symtoms would be if you were 1-tooth off on cam timing in either direction (with a stock cam).  Obviously, the car would be weak whether it's advanced or retarded a tooth, but for those who have been there before, what did you see.

I have a spare adjustable cam gear lying around that I could throw on just to see the results, but that's just extra work and I'd rather just hear from those who have experienced it biggrin.gif


Loss of power Bad Vac at idel.
Just put the crank to TDC and make sure the cam dowel is at high noon.

#4 jonboyb

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Posted 20 May 2008 - 01:08 PM

QUOTE (TainterRacing @ May 20 2008, 06:52 PM) <{POST_SNAPBACK}>
Just put the crank to TDC and make sure the cam dowel is at high noon.


This is not in reference to a certain car, we were just discussing the effects on SOHC turbo engines

Edited by jonboyb, 20 May 2008 - 01:08 PM.

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89 Dodge Raider - Turbo TBI MSII
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#5 TainterRacing

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Posted 20 May 2008 - 01:12 PM

QUOTE (jonboyb @ May 20 2008, 02:08 PM) <{POST_SNAPBACK}>
This is not in reference to a certain car, we were just discussing the effects on SOHC turbo engines


ooo well the vac will not be right thats going to be one of the bigest ones to look for. car might run hot as well I have had both happen to me be for.

Edited by TainterRacing, 20 May 2008 - 01:14 PM.


#6 jonboyb

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Posted 20 May 2008 - 01:23 PM

It seems logical to me that 1-tooth advanced would produce extremely quick boost while 1-tooth retarded might not boost much at all.  Of course that could be completely backwards too biggrin.gif
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89 Dodge Raider - Turbo TBI MSII
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#7 PDX87Starion

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Posted 20 May 2008 - 03:31 PM

One tooth is way too much in either direction. I cant remember but its like 1 tooth = 7 - 10deg. or something like that.

I would guess it would run pretty crappy either way.
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#8 Indiana

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Posted 23 May 2008 - 11:35 PM

One tooth is around 19 degrees because you are talking about crank degrees any time you refer to cam timing so its always going to be double.

you have a milled head and deck cause you wanted a flat surface on the head and a zero deck and you are really screwed, you could be over one tooth off depending on what was done

Stock Cam Specs:

Intake Valve    Opens   25 BTDC

                      Closes   59 ABDC

Exhaust Valve  Opens   64 BBDC

                       Closes  20 ATDC

Edited by Indiana, 23 May 2008 - 11:40 PM.


#9 Shelby

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Posted 27 May 2008 - 12:36 AM

on a stock engine, the  first thing that  should be notice'd is it's darn near imposible to get the dist properly time'd ,,the dist install procedures are the same for all yrs and all  of our cars , this also means that with in a few degrees all dists will set in the same position,, this time last  time and the next time the dist is r&r'd , if it  don't then the cam  gear is not in the right position (cam gear or crank gear is not in time ) mormaly it's the crank gear thats off, sence the chain can easily  drop down and slip a tooth while the cam gear is off,, you have to manualy move the chain on the cam gear for it to change
if the crank & cam are not in alignment the dist will not  set in it's normal position

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#10 DomJoseph

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Posted 27 May 2008 - 01:14 AM

If it's off either way, it won't pull a sick ***** off a toilet. rofl3.gif




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