Timing Sets.

[3400-95-Modified]

This is my old comparison between a 05 set with 15k on it on LS6 springs and a milzy cam, vs 4k miles on a stock setup.

One with hulk hand is the stretched setup.


This is the replacement one I put on... Which actually got pulled for the Cloyes set before it went together for sure. And we all know how that worked out.

[3400-95-Modified]

Well, new set is in. Its still loose, but I'm positive thats with in spec.. since um its all new GM parts. Once dampener is installed there isn't much play anymore.

Anyone else verify this movement is normal?

[mfuller]

Looking forward to your results.

[3400-95-Modified]

Got my new set back, and I should be installing at least that much tonight... I doubt I'll get the whole thing back together. BUT I will definately get a vid of how tight the new setup is in comparison to what I took off.

[3400-95-Modified]

Ok, well if my Cryo treatment helped in at all, then that should extend the life of the chain. I guess we will see.

We obviously know what happens with a Cloyes chain on these large cams.... And the Cloyes timing gears on a UDP application.

[CNCguy]

The following information is based on my conversations with chain manufacturers/distributors.

In regards to tensile strength, stock timing chains are stronger than roller chains due to their construction. It would be a waste of money to do a tensile strength test of the chains as the longevity of a roller chain comes from the pivot design where the hardened link pin is pivoting inside a smooth hardened tube instead of layers of short holes that were stamped in a die.

Everyone, including myself, always refers to it as chain stretch but the links aren't stretching. Instead, the pivots are wearing out like a door hinge on an old car. A worn chain will sag like that door when you hold it out sideways.

The double roller has two rows of smaller links which gives it more tensile strength but, more importantly, has longer pins that provide a larger wear surface. Double roller pins are about 50% longer but smaller in diameter. Some of the extra wear area is negated due to the reduction in pin diameter.

The only way to accurately test chains would be to run them on an engine as simulating the harmonics of an IC engine would be near impossible.

[3400-95-Modified]

This is how it usually ends up, back in 06 I go buy a Milzy cam and then before the motor is even in, ben starts poping out custom grinds for cheaper... I go and get a stock chain an cryotreat it and now you pop out a roller timing set

I know the double rollers are 35% stronger, but how much stronger is the single roller over the stock chain? have you tested that at all? Maybe end of next year I may want to buy one.

[CNCguy]

Don't want to hijack Jon's thread so I updated my thread about them.

http://60degreev6.com/forum/f96/some-new-60v6-products-t41730

[onefastV6]

They are finally in process.

Hell yeah, any idea on a time frame?

[CNCguy]

They are finally in process.

[IsaacHayes]

Your Cloyes looks like my OEM did at 180k or whenever I changed it.
I'll try to remember to get a pic of the cloyes sprockets. Yours looks torn up. My OEM sprockets looked barely broken in...

Man, we need billet hardened sprockets and roller chains for cammed stuff! lol

[loner666]

I moved to SC about a month ago so the car is currently 500miles away from me in FL still

[MY91GT(Z)]

whats the word on the outcome for your car^^^

[loner666]

Id hate to see mine after this....

[3400-95-Modified]

To be quite honest though, I remember pulling all the parts out of a cloyes box and just installing them... SO I wonder if the set I got contained a GM cam sprocket and a Aftermarket crank sprocket, and then the aftermarket chain....

If you want my honest opinion I think the cam gear wear is just due to the cam I'm running, and then the fact that the chain loosened up and once it does that it starts to beat on the gears more... The crank sprocket wear simply shows how cheap that replacement part is, and the chain, well we can see these aftermarket ones just don't last long in a cammed setup.

I know in the pics of the two side by side, the teeth look different but that's because one setup is chewed to hell were the stock GM one isn't beat as much. I believe that the chain spacing and angles are all the same, because I'm not the only one who has used a mix and matched set. Issac on here is running a cloyes chain with two GM sprockets, because he said it was tighter fit with the GM ones over the cloyes ones. This is on a fully stock motor though, so he may only notice a quicker chain fatigue, rather than getting 200k like he did on his stock chain.

Actually Issac, if you still have those cloyes sprockes or whatever you bought, Take a pic of the cam one and post it, I'm curious to see what it looks like.

One other thing to note, I was not aware of this damage on that stock 3400 till well after I had built this motor and it was in running, hence buying cloyes stuff again, so I would have had no reason to mix and match a timing set... That leads me to believe that maybe they are actually using GM cam sprockets in their kits now, BUT one may never know unless you go buy one again