More timing chain bs - look inside

[Guest]

You could use a gear drive in a 660. A 3 gear arrangement with bevel cut gears would be nearly silent. However it still transmits harmonics to the valve train and the cam sensor. Having the oil pump driven by the cam helps to dampen some of the harmonics.

A belt drive would be the cats ass. Making one may be possible with the right combo of off the shelf parts but the timing cover would have to be fabricated. The nice thing about a belt drive is you can run it dry so you can make a flat timing cover, run the belt on the outside. Water pump fabrication would have to be solved as well. You may be able to make block to pump adapters and run an electric pump.

Yeah, I wasn't about to bring up the transfer of hamonics through the gears of a timing gear set, and how they have been known to break cams, and ruin other parts....

If I stay with the typical Gen3 660, and not go to one with VVT, I will be looking into a timing belt set-up even more than I already had been.

[pocket-rocket]

And here the LQ1 got such a bad rap because of the belt maintenance, lol.

[robertisaar]

And here the LQ1 got such a bad rap because of the belt maintenance, lol.

you said what we're all thinking...

i honestly can't pass judgement on it though... i have yet to do it myself. but maybe an aftermarket setup wouldn't require pulling the wheel or some crazy shit like that...

[onefastV6]

And here the LQ1 got such a bad rap because of the belt maintenance, lol.

Maybe a dumb question, but on the LQ1 there is a timing chain on the balance shaft that looks like a single bolt from the way the parts drawing looks. Any idea what the chain/sprockets looks like and if it might be of any value in the OHV engines?

[pocket-rocket]

Yes, there is a chain on the "intermediate shaft" as GM calls it. I've never pulled the cover off of a DOHC to see if it's a heavier chain, but it certainly is worth a look. Ben tore one down, I wonder if he noted anything worth while.

[3400-95-Modified]

I don't know how suspicious you should be, but I am certain that the volume of sales over the age of the design is probably a major price factor.

If you read my old threads about timing chain woes... you would realize the Cloyes sets are of a lesser quality... Hell they appear to NOT be hardened. One set I got did NOT have a hardened cam gear OR crank gear. The second set I had purchased came with a GM cam gear, but a cheap NON hardened crank gear again... And the chains also look significantly weaker.

Rodney, go 99 if you havent already I bought direct from GMPartsDirect and sent mine off for the deep freeze and so far its still quite.

[geoffinbc]

I am running a COMP timing set. Seems to be fine so far and it was a good snug fit on the install.

[3400-95-Modified]

I am running a COMP timing set. Seems to be fine so far and it was a good snug fit on the install.

Far from roller cam applicable though.

[onefastV6]

I am running a COMP timing set. Seems to be fine so far and it was a good snug fit on the install.

I am wondering if the COMP timing chain could be used with a set of 99 & older timing gears and if it would be any stronger. I can get the COMP chain by itself for $25

[geoffinbc]

Worth a try for that price.

[3400-95-Modified]

The Comp timing chain is a totally different design. The 94-99 gears are for rocker joint chains, NOT roller chains, so it just won't work right.

Please remember the 94-99 is the same principal as the 2000+ chains, BUT they are just wider and stronger, the 2000+ ones they decided they could cut back on the chain size since the valve train was not that aggressive and cutting back there frees up some rotating weight of the engine so essentially frees up some HP.

[3400beretta]

Well I pulled my timing cover off the other day, and my noise is not the chain. In fact it couldn't be in any better shape - which is somewhat surprising to me considering that engine had about 50,000 kms on it from the junk yard. The chain has less slack in it than Eric's brand new pre 99 chain that I just installed on his engine. Anyways, I'll be ordering the pre 99 set for myself since I'm in there now.

Now I'm at a loss as to what my noise is. It was definately coming from the lower part of the engine, is it possible that my windage tray is vibrating or something? Next is the oilpan to come off. I'll post what I find.

[onefastV6]

The Comp timing chain is a totally different design. The 94-99 gears are for rocker joint chains, NOT roller chains, so it just won't work right.

Please remember the 94-99 is the same principal as the 2000+ chains, BUT they are just wider and stronger, the 2000+ ones they decided they could cut back on the chain size since the valve train was not that aggressive and cutting back there frees up some rotating weight of the engine so essentially frees up some HP.

The COMP set that I was referring to is not a roller chain and looks to be similar to the 94-99 chain.
COMP Part #3201