4.) Proof that on at least one occasion in the last 6 months your family was forced to go without food because of lack of funds attributed to your LS1 modding addiction ...........

What happens if this has happened more then once? ....

 

Well, you're probably divoreced now for one. For another, now that you've lost your child as a tax deduction, you're probably trying to get your car recognized as a dependant.

 

You mean cars arent classified as dependents? WTF, I better go see my finance officer...

 

I don't know where this whole "Rolon" chain info came from. Let me tell you about mine.

I purchased a single Rollmaster timing set from KB Engine Parts in Australia.

The set costs $65 delivered to the US. This was about 13 months ago. It consisted of a Rollmaster gear set and a Jwis single chain. I just wish I still had the P/N. The timing gears are non-adjustable.

The Jwis and Iwis name is a little confusing. I don't know why the chain has a "J" in it which spells JWIS.

The JWIS is actually an IWIS/Ketten chain manufactured in Germany. And I can tell you that the Rollmaster gears (sprockets) come from a company in Australia called ROMAC/Rollmaster

I don't have a clue as to where some of you folks are getting a Rollmaster [single] timing set with a chain marked "ROLON". And where did the info that this so called "ROLON" chain came from India?


Again, my single Rollmaster non-adjustable timing set came with a single chain marked clearly "JWIS", and the upper cam gear clearly was marked "Rollmaster".

Ron,

 

I agree with you on the matter of the confusion surrounding the Iwis/Jwis subject. I think it comes from the Iwis logo where the I really looks like a J.

The info about Rolon came from a long talk with an engineer at Cloyes. The info about GM timing sets came from the same source. Yes, the Rollmaster sprockets are from Austrailia, yes the Iwis chain is from Germany, and yes Rolon is in India.

 

My Rolon comments came directly from the link to the Rollmaster website I listed.

Based on what was on the site Rollmaster has two different chains they use depending on the application.

As for having to machine something like the ASP to get something else to fit, yes that suck. I'll have to ask SRP next time if they had to do anything to the ATI to get it to fit. I'm pretty sure they didn't have to machine anything but I'll ask, cause I'm not sure.

Agreed, these cars should be classifed as dependents...

Let me guess tomorrow it's stock vs ported oil pumps? :p

 

When I was doing my cam install, I decided to opt for the double roller. I bought the Rollermaster Double roller from SDPC with the Torrington bearing for $85. The chain that came with it has "Iwis" stamped on every other link. I bought this in December of '02 and it has held up fantasticly. So does this make mine twice as strong as the single "JWIS" chains??

 

Just to try to clarify a little on the above info...

The ignition timing isn't mechanically timed true, however the valve timing is mechanically timed. Those two are not the same thing.

The crank turns the little gear that turns the chain (either single or double as one may please) the chain turns the big gear that turns the cam. The cam directs valve timing.

 

I'm going to have to do a test. THE VERY NEXT shortblock I have at my disposal is going to be degreed with a new factory GM timing set, followed immediately by a Rollmaster double w/Iwis chain.

If mechanical valve timing is your interest, we'll see what there is to be learned. I'll document the valve timing events, and we'll compare. If there is a variance large enough to register on the degree wheel, perhaps there's some merit to the tighter chain. If there's not enough variance to register on the degree wheel, can we at last agree that the matter is that of personal preference?

 

I took DaleMX's idea and ran with it. I started a poll in the internal engine section to begin gathering data on which timing chains people have broken. I hope I included all the relevant manufacturers... There are certain dangers involved in posting past 1:00AM. Caveat Emptor

https://ls1tech.com/threads/showflat...31&fpart=1

 

SLP Double roller timing chain...its not youth and I have had a single chain break...I used to race a 71 hemi-cuda that was built up into the 800ish hp range...dam fast...and before I got there I had a single chain that broke...and the engine basically destroyed itself....Thank goodness I was touring(as an audio guy) a lot then and had a lot of money in the bank to re-build it...I had a buddy who owned a shop and picked most of the internal stuff for me....
as for my new double chain...I also have 80000 miles on this engine....and I dont want some slack *** stock chain wearing out and stretching out...after all...have you seen the play in these things sometimes...wouldnt want it to skip a tooth and screw up the valve timing...the double is just real good insurance...even if you are only at 30000 miles doing the cam install...I would have done mine much earlier if I wasnt on the road so dam much.and again toclarify the "cheap" comment...why would you spen all that money on a car....and add performance stuff to it and then not add the other performance stuff that can go in at the same time??? you dont buy headers and then put back on the stock muffler???(atlest I would hope not) Its a simple easy upgrade to a better part that will last longer and will most likely outlast the parts that remain stock and eventually fail...I even recommend doing the oil pump at the same time as a cam install....5 more bolts...and if you change the timing chain...you gotta pull it off anyways... on that big of a lift make sure you get springs that can handle it(get rid of the stockers...lots of engines go to hell because of stock springs not handling a different cam)and dont forget new pushrods....(again broken pushrods on ls1's are another common thing from what I understand)...again...why only upgrae 1 part...change the oil...change the filter...get my point...

not meant to harp on something....
just meant to point out an opinion....
you want a better answer...go ask nascar or cart...or anybody who's entire business is racecars.

 

I like the way the poll looks 1999_SS_M6. I gotta figure out how to do that.

 

and heres another good article for you to read....
https://ls1tech.com/threads/showflat...31&fpart=1
its a broken single chain...at 377rwhp...ouch.....
have I convinced you that double is a GREAT investment???

 

too late, you are and have been harping, put the soap box away now....

in addition to reusing the stock push rods, I'll be using a new stock single chain with my next cam install in 2 weeks Just bugs the hell out of you doesn't it?

 

You will be surprised at how much slop a stock chaing can have without having a significant affect on the valve timing. I did the test because of this same argument, but it is too long ago to remember numbers.

I agree with you. I don't like the idea of spacing the pump and machining a pulley to use a double roller chain. Besides, I am not convinced that the double buys you anything. First, sooner or later any brand/type of chain will fail. It is simply the odds. Make enough of anything and sooner or later you will have a bad one. The failures being discussed here sound more like infant mortality kinds of failures rather than failures from old age or stress. Those cannot be predicted, cannot be economically prevented, and will happen to someone. For ever stock timing chain that fails, there are tens of thousands that don't.

 

then you got ripped IMO....I paid $95 for the gears and chain, with shipping from AUS another $15.

 

There was a guy on LS1.com a while back that did break his stock chain. He then installed a Cloyes setup and broke that too. He then tracked it down to an SLP pulley causing bad harmonics. Replaced the pulley and hasnt had a problem since, that I have seen. I think his name was SSinful. FWIW, my stock chain is just as floppy now as it was the day it was new. I too wonder how many of these chains that have broken are actually due to poor quality and how many are due to some sort of a driver error.

 

i don't understand all this talk of machining pullies. how many people actaully had to do this? i have a dual rollmaster and ASP pulley and there was no problem. i'm just curious who and what kind of car they are on

 

Thanks man. I just wanted to make sure I gave you props for the good idea. I didn't want you to get hacked off and think I tried to steal it. Hopefully it will get enough activity to catch a forum director's eye and get a sticky.

 

1999_SS_M6
what agressive cam "were" you running that helped your motor make it into your floor??