Pewter02TA

What would be the symptoms of having slack in the timing chain??

Lithium

iTrader: (47)

What chain did you put on? I believe some have more slack then others...

Pewter02TA

I still have the stock chain with 40,000 miles, but I have a random missfire and its not fuel related, pushrod, ignition, or bent valve.

Lithium

iTrader: (47)

Seems a lot of people have had slack in their stock chains - https://ls1tech.com/forums/generation-iii-internal-engine/325345-so-i-guess-ls1-s-run-lot-slack-timing-chain.html

Pewter02TA

anyone?

SSDoubleK

iTrader: (100)

When I changed out my timing chain with my cam install, it had a fair amount on play in it. I changed over to the LS2 timing chain and it did fit tighter.

|Drew|

But what are the simptoms of having to much slack????

Lithium

iTrader: (47)

Is it possible to have to much slack in the chain? what problems can that cause? I am lost now lol sorry!

slow trap

iTrader: (22)

maybe slight timing differences but i don't think it would be enough for misfires.are you running a colder plug like the tr6 ?

GuitsBoy

iTrader: (4)

Unless you get enough slack to cause a mechanical failure, the only thing I could see it do is retard yoru cam timing. This will result in moving your power band upwards in the rpm range. While it may lose a little low end since it moves max torque upwards, if anything it may increase top end HP. Atleast to a certain point until it stretches too far.

ShevrolayZ28

iTrader: (4)

The effect of slack is an interesting consideration. I guess it would make for a slight variation in valve timing, but would it only be in the retard direction? I would think that on deceleration the crank would cause the cam to decelerate. Would this move the slack to the other side of the timing gears and cause slight advance?

I wonder if it really makes a significant difference.

GuitsBoy

iTrader: (4)

During deceleration, the drivetrain is still turning the crank and not the camshaft. Yes, the cam has inertia, but I think overcoming the valvesprings might be enough to keep the inertia from spinning faster than the crank... Although, im basing this soley on my imagination of the way things work...

ShevrolayZ28

iTrader: (4)

I can't see, said the man with 20/20 lol.

Someone needs to build a transparent motor so I can see exactly what the heck goes on in there.

But I think I understand what your saying.

Acceleration of car: the crank accelerates the drive train and the cam.

Deceleration of car: the drive train deceleratres the the crank but the crank still accelerates the cam. (In other words, the cam is not applying a force to the crank in a dircection so as to reduce crank rpm.)

Pewter02TA

Nope Im runnin tr55's but have recently changed them.

daryl2cb@yahoo.com

iTrader: (2)

think your recent plug change is the issue, look for a not fully seated plug wire.

Pewter02TA

I have checked that many times. Any other ideas?