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Topic: Timing

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Re: Timing (2/12)
 8/16/14 6:34pm
Sarge81Lifetime Member
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WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.


Joined: 12/3/2001
Posts: 2379

Welcome to C3VR. Your question isn't a dumb one. Ask away, we are here to help you along with your journey in a C3.

Your timing shouldn't change unless the distributor hold down clamp is loose or... the vacuum advance doesn't work or... the mechanical advance inside the distributor become stuck or... timing chain becomes stretched out severely.  

How many miles are on your engine? Why do you say the car doesn't feel the same lately? 


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GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.
3.54 Dana 44
'69 "N11" Sidepipes
Borgeson Steering Box
Born 8/1981
Sequence #3975




Click here to see more pics of my Vette on CarDomain.


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Re: Timing (3/12)
 8/16/14 7:29pm
ricks79vette
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Show Low, AZ - USA

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1979 T Top coupe


Joined: 9/27/2010
Posts: 8

I agree - unless the clamp has come loose and the distributor is "bumped" the timing should not change.  Normal wear and tear on components can cause small shift in timing, but nothing major.  If the timing chain has become loose, you can experience a major shift in timing and poor engine performance.  I will ditto the previous reply with "how many miles?" as this is also helpful in troubleshooting issues.  Has the rotor and cap been changed?  Plug wires, coil?  Vacuum lines and hoses?  lots to consider - Fuel, air, electrical?

|UPDATED|8/16/2014 4:29:50 PM (AZT)|/UPDATED|


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Re: Timing (4/12)
 8/16/14 7:32pm
ricks79vette
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Show Low, AZ - USA

Vette(s):
1979 T Top coupe


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RE;LS6 engine swap.

Purchased a 2001 with the 5.7 Liter, and wow, what a difference from my 79 350/300.  How much trouble was the swap, and what did you end up spending to complete the conversion?



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Re: Timing (5/12)
 8/16/14 8:52pm
nevr2ol
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Pensacola, FL - USA

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76, 4 speed, engine built to 375 hp.


Joined: 5/9/2014
Posts: 35

Thanks everyone for the help. And thanks for the welcome.  In reality, I have not driven the car much this summer. I live in Florida and although I do have A/C, it has been hot which helps thunderstorms pop up from nowhere and I try not to drive it in the rain. I took it out last week and had to replace the ignition module so I put a new rotor and cap on the distributor and it seemed to be fine. I drove it this morning and it seemed to idle a little rough but when I got on an open road and had a chance to get on it a little, it didn't miss or stutter but it felt a little off on the normal power. I have about 10,000 miles on it since I had the engine rebuilt with another cam, pistons, aluminum heads and intake. I'm going to check the vacuum hoses tomorrow. I guess if I would drive it a little more I would get the feel of how it is suppose to fun.
Again, thanks everyone.


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Re: Timing (6/12)
 8/16/14 9:02pm
nevr2ol
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Pensacola, FL - USA

Vette(s):
76, 4 speed, engine built to 375 hp.


Joined: 5/9/2014
Posts: 35

I want to clarify my mileage over the last couple of years. I only drive it at most 2000 miles a year. The 10,000 miles was since I had the engine rebuilt.

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Re: Timing (7/12)
 8/16/14 10:57pm
Sarge81Lifetime Member
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WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.


Joined: 12/3/2001
Posts: 2379

nevr2ol said: Thanks everyone for the help. And thanks for the welcome.  In reality, I have not driven the car much this summer. I live in Florida and although I do have A/C, it has been hot which helps thunderstorms pop up from nowhere and I try not to drive it in the rain. I took it out last week and had to replace the ignition module so I put a new rotor and cap on the distributor and it seemed to be fine. I drove it this morning and it seemed to idle a little rough but when I got on an open road and had a chance to get on it a little, it didn't miss or stutter but it felt a little off on the normal power. I have about 10,000 miles on it since I had the engine rebuilt with another cam, pistons, aluminum heads and intake. I'm going to check the vacuum hoses tomorrow. I guess if I would drive it a little more I would get the feel of how it is suppose to fun.
Again, thanks everyone.


RE;LS6 engine swap.

Purchased a 2001 with the 5.7 Liter, and wow, what a difference from my 79 350/300.  How much trouble was the swap, and what did you end up spending to complete the conversion?

Bill what brand ignition module did you put in your distributor? 


Rick, 
 The swap was a challenge since there is no "kit" out there to make it a simple bolt in. I spent around 6k doing everything…from rebuilding a 5.3L L33 engine into a 5.7L LS6 spec engine down to the last bolt. Would I do it again? Not a C3, maybe something with a bit more room under the hood. I'd be glad to PM you with details if your interested. 






______________

GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.
3.54 Dana 44
'69 "N11" Sidepipes
Borgeson Steering Box
Born 8/1981
Sequence #3975




Click here to see more pics of my Vette on CarDomain.


Lifetime Member #26
Re: Timing (8/12)
 8/17/14 4:28pm
nevr2ol
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Pensacola, FL - USA

Vette(s):
76, 4 speed, engine built to 375 hp.


Joined: 5/9/2014
Posts: 35

Sarge, the control module manufacture is a good question. I tried to look this afternoon but didn't see any markings. When I bought it, I was surprised it was only 21.00. The last one I bought was over 30.00. In your opinion, it seems this could be a problem, am I correct? 

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Re: Timing (9/12)
 8/17/14 10:09pm
Sarge81Lifetime Member
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WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.


Joined: 12/3/2001
Posts: 2379

nevr2ol said: Sarge, the control module manufacture is a good question. I tried to look this afternoon but didn't see any markings. When I bought it, I was surprised it was only 21.00. The last one I bought was over 30.00. In your opinion, it seems this could be a problem, am I correct? 


Ya never know. I try to stick with AC Delco stuff. I've had problems in the past with the cheaper aftermarket stuff. If you still have the old one, try switching it for the new one and see if your problem goes away. 

______________

GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.
3.54 Dana 44
'69 "N11" Sidepipes
Borgeson Steering Box
Born 8/1981
Sequence #3975




Click here to see more pics of my Vette on CarDomain.


Lifetime Member #26
Re: Timing (10/12)
 8/18/14 9:08am
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


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nevr2ol said: I took it out last week and had to replace the ignition module so I put a new rotor and cap on the distributor and it seemed to be fine. I drove it this morning and it seemed to idle a little rough but when I got on an open road and had a chance to get on it a little, it didn't miss or stutter but it felt a little off on the normal power.


There's a key item...WHY did you have to replace the module? Did it run ok BEFORE replacing the module, and then felt down on power AFTER replacing the module? It's possible you got the incorrect module for the ignition....there are many different types of modules, and the modules HAVE to match up with the coil. The incorrect(or a faulty) module will definitely mess with the ignition timing. I would start with that, if the engine was running fine before the module switch....Thumbs Up
Did you apply the heat sink grease to the underside of the module when you installed it?

Also....you could have just gotten some crap fuel....Dead


|UPDATED|8/18/2014 6:08:01 AM (AZT)|/UPDATED|


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Re: Timing (11/12)
 8/18/14 9:03pm
nevr2ol
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Pensacola, FL - USA

Vette(s):
76, 4 speed, engine built to 375 hp.


Joined: 5/9/2014
Posts: 35

Hi Adam's, The last couple of times I have driven the car it would feel like the engine completely cut off, while driving,  for only a second then start again. Both times I had been driving for 30 minutes or so. This happened once before and after going through the same thing, it would not crank at all. I had the car towed to a friends shop and they changed the ignition module. Since I put the new module in this time, it quit cutting out but doesn't feel as responsive.I'm going out of town on business for a week but when I get back, I believe I will find a Delco module and see if there is a difference.
I hope all of that made some kind of sense.


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Re: Timing (12/12)
 8/18/14 10:46pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20126

Absolutely it does. You described perfectly a failing ignition module, so putting a new one in makes perfect sense. It's possible the module installed may not be correct, tho, so it's something to look into. It's also possible that the wiring for the pole-piece/pick-up has bad insulation, and it was moved enough during the module swap that it could be causing a problem, but usually you would have a mis-fire, or rough running engine if that was the problem. You might want to take a good look at the wiring for the pole-piece(the connector that plugs into the iggy module) next time you're in there.... Thumbs Up 

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