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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 11-16-2012   #1 (permalink)
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Default I6 timing

I have had the timing on my 67 I6 at around 12 with a timing light. I put it at 12 because I read that on the inline6performance website and my manual says 6 pts over OS ok for performance. Someone told me it was too high though. I put it back to around 8. Now it stumbles off a start. I think it sounds better at 12. Any suggestions? Is 12 ok?

SG
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Unread 11-16-2012   #2 (permalink)
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If it doesn't knock there is nothing wrong with 12.
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Unread 11-16-2012   #3 (permalink)
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Ook thanks. I thought I heard a knocking when I turned the timing down actually. Does this make sense? Where does this knocking sound come from? Will 12 wear the timing chain out?

Thanks
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Unread 11-16-2012   #4 (permalink)
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I don't know of any connection between timing advance and wear on the timing chain. Too much advance causes knock which can damage the pistons, etc. Knock is the gas prematurely exploding in the cylinders. Its like hitting the pistons with a hammer instead of just pushing on them like is supposed to happen. More advance gives more knock so if you didn't hear any at 12 then you for sure won't hear any at 8.
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Unread 11-16-2012   #5 (permalink)
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With my I-6, I timed it with a vacuum gage and it has never run better. Hook up the gage to a spot on the carb, keep the rpm at about 600 rpm, adjust the timing until you get as close as possible to 20 hectograms. I think hectogram is correct. Or the highest vacuum you can get. Shut down the engine and restart and drive. If you had any starting issues back off the timing a little. Good luck!
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Unread 11-16-2012   #6 (permalink)
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Quote:
Originally Posted by Bryonl View Post
With my I-6, I timed it with a vacuum gage and it has never run better. Hook up the gage to a spot on the carb, keep the rpm at about 600 rpm, adjust the timing until you get as close as possible to 20 hectograms. I think hectogram is correct. Or the highest vacuum you can get. Shut down the engine and restart and drive. If you had any starting issues back off the timing a little. Good luck!
Thanks. Iv been hearing about using a vacuum gauge. I think I'm just going to get one. I just hook it to the one vacuum line at the carb?
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Unread 11-16-2012   #7 (permalink)
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Can someone please direct me to a site that shows a vacuum gauge? Never seen one. Will pepboys have them?
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Unread 11-17-2012   #8 (permalink)
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The vacuum gauge method is probably the best method for setting timing on these old motors, in that the outer ring on the balancer that carries the timing mark can slip and throw off the reading. If you have an A/T, the correct timing, I believe, is 12 degrees, while the standard tranny setup calls for 6 degrees.
As far as the vacuum gauge method is concerned, locate the vacuum source for the tranny (If A/T) and hook up to that. The "hectogram" reading throws me, since all gauges I have used are calibrated in inches of mercury. Makes no difference, though. With the carb idle set as best you can, adjust the timing to produce the highest steady vacuum gauge reading possible, then back off about one point (that's for the crappy gas out there). If the car pings or knocks, back the timing off one more point.
Best,
Al
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Unread 11-17-2012   #9 (permalink)
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Hi all
I have an I6 200ci 1965
I have a pinging issue even though I've backed my timing off, as far as I can remember to about 9 degrees
It only happens at higher revs though, normal driving is fine.
It runs nicely too and is quick off the line.
My distributor is not original ..is a 1970 (or maybe 71) but is matched with the carb (ie no spark valve)

should I continue to back the timing off even though it only rattles at high revs..? .. or should I buy a vacuum gauge and try that??
** would I need to get one with a specific thread size adaptor..?? **
I hear that backing the timing too much will cause some overheating..

Cheers
D
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Unread 11-17-2012   #10 (permalink)
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Quote:
Originally Posted by Route66UK View Post
Hi all
I have an I6 200ci 1965
I have a pinging issue even though I've backed my timing off, as far as I can remember to about 9 degrees
It only happens at higher revs though, normal driving is fine.
It runs nicely too and is quick off the line.
My distributor is not original ..is a 1970 (or maybe 71) but is matched with the carb (ie no spark valve)

should I continue to back the timing off even though it only rattles at high revs..? .. or should I buy a vacuum gauge and try that??
** would I need to get one with a specific thread size adaptor..?? **
I hear that backing the timing too much will cause some overheating..

Cheers
D
Just wanna say that I went to England once and never wanted to come back to the US. (I'm actually listening to my favourite comedian Ricky Gervais while writing this, don't know how popular he is there though) Haha. But anyways. I get the best running engine when its at around 12 with the rpm at, I think, close to 700. You said yours is quick off the start. Iv been trying to find a way to do that with my I6 . What have you done to yours??

Thanks
Cheers
SG
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Unread 11-17-2012   #11 (permalink)
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Hi Myblue

Ironically I always wanted to live in USA!!! .. only thing that would not be so good is that you have to buy unbelievably expensive medical insurance .. what some people have said it's just unreal (ours is free of course)
A few years ago I was on a roadtrip that took in the Rockies and stayed in a cabin there (Avalanche Ranch in Colorado) .. that along with restoring / selling classics would be my idea of the absolute perfect life..!
Anyway ... off subject a bit! ..

Yes mine pulls really well off the line .. I thiiink someone said that a more retarded timing setting would help with off-the-line pull, (check that out tho' as my memory may be flawed on that!)
apart from that mine is completely stock - I have a C4 so if yours is manual there may be some advantage with a torque converter (???)

hmm... I'm going to the UK's main classic car show of the year tomorrow - don't know whether to get a vacuum gauge .. never ever thought of
timing a car with one!!

Yeh Ricky Gervais is very popular here .. not sure if you get 'the ricky gervais show' (a cartooned version of his podcasts)... is actually really good. Oddly enough I really like your Steve Carrell who's a bit like Gervais



All the best!
D
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Unread 11-17-2012   #12 (permalink)
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Quote:
Originally Posted by myblue67 View Post
Thanks. Iv been hearing about using a vacuum gauge. I think I'm just going to get one. I just hook it to the one vacuum line at the carb?

I'm 42 and been working on buddies cars, my own cars, etc, since I was about 14 or 15, and I never had a vacuum gauge. Earlier this year a friend suggested I use one to set my air/fuel mix and my timing, and my car has never run better. I wish I had realized how handy this simple device could be decades ago!

(and I need to add this point; the car needs to be at normal operating temp)
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Unread 11-17-2012   #13 (permalink)
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Quote:
Originally Posted by Route66UK View Post
Hi Myblue

Ironically I always wanted to live in USA!!! .. only thing that would not be so good is that you have to buy unbelievably expensive medical insurance .. what some people have said it's just unreal (ours is free of course)
A few years ago I was on a roadtrip that took in the Rockies and stayed in a cabin there (Avalanche Ranch in Colorado) .. that along with restoring / selling classics would be my idea of the absolute perfect life..!
Anyway ... off subject a bit! ..

Yes mine pulls really well off the line .. I thiiink someone said that a more retarded timing setting would help with off-the-line pull, (check that out tho' as my memory may be flawed on that!)
apart from that mine is completely stock - I have a C4 so if yours is manual there may be some advantage with a torque converter (???)

hmm... I'm going to the UK's main classic car show of the year tomorrow - don't know whether to get a vacuum gauge .. never ever thought of
timing a car with one!!

Yeh Ricky Gervais is very popular here .. not sure if you get 'the ricky gervais show' (a cartooned version of his podcasts)... is actually really good. Oddly enough I really like your Steve Carrell who's a bit like Gervais



All the best!
D
We only get bits of what Gervais does. I only have one season of the Ricky Gervais show but I listen to every single podcast he has ever made and Karl pilkington is hilarious. If I do one thing before I die it would be to meet them, maybe Steve merchant too. Haha.

Mine is also stock. Iv only put a dual outlet header on. Mine seems to run a lot better with more advanced timing but I'm going to find a vacuum gauge and go by that. Anyone have a link to a place that has them??
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