Double roller timing chain on '85?
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
Cloyes is the brand to buy. You've already found out what happens when you go with a lesser product. Try it with the stock cover. If it doesn't fit get an aftermarket cover. This isn't rocket science.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
I don't know, it just works. I have a non-roller block on an engine stand with a double roller chain and the stock timing cover. It works too.
Cloyes is the brand to buy. You've already found out what happens when you go with a lesser product. Try it with the stock cover. If it doesn't fit get an aftermarket cover. This isn't rocket science.
Cloyes is the brand to buy. You've already found out what happens when you go with a lesser product. Try it with the stock cover. If it doesn't fit get an aftermarket cover. This isn't rocket science.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Is this the same one that MrWillys posted? I'd prefer to buy from Summit Racing because the stuff I'm going to buy totals over $100, so I'll get free shipping. http://www.summitracing.com/parts/clo-9-1100
Instructor
Joined: Jun 2014
Posts: 178
Likes: 3
From: Pensacola FL
Popped it I think. Took out a few valves so far. I don't want to get too involved with this but I'm sending the heads and everything to the machine shop to get checked. Forged TRW pistons have small nicks in them. I should have put a double roller in back when I did the cam but I wasn't too aware of what was involved. Thought I had to change a lot of things. By the way it was a cloyes single roller chain for anyone wondering.
During reassembly, make sure the push rods are not bent. You can roll them across a flat surface like plate glass to check them. The machine shop should check for proper spring pressure and installed height when repairing the valves.
Just tossing out some ideas for why the chain failed.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
You did not mention how much valve lift you are running. I would check the valve train for proper clearance, especially the push rods and rocker arms. Stock rockers can bind at more than .500 lift. The pivot slots are not long enough and can contact the rocker studs at high RPMs. If you are running aftermarket 1.6 ratio rockers, the geometry changes and the push rods can bind where they pass through the heads. The holes need to be enlarged.
During reassembly, make sure the push rods are not bent. You can roll them across a flat surface like plate glass to check them. The machine shop should check for proper spring pressure and installed height when repairing the valves.
Just tossing out some ideas for why the chain failed.
During reassembly, make sure the push rods are not bent. You can roll them across a flat surface like plate glass to check them. The machine shop should check for proper spring pressure and installed height when repairing the valves.
Just tossing out some ideas for why the chain failed.
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Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Also, I noticed that most of them don't have a timing pointer... I would like to use a timing pointer. Thanks.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Should I, should I? ....Doh!...
I'd want to find the root cause of the failure. Single roller should last a long time w/your flat tappet cam. A lot longer than yours did.
There goes your Dyno day budget. And header budget.
I'd want to find the root cause of the failure. Single roller should last a long time w/your flat tappet cam. A lot longer than yours did.
There goes your Dyno day budget. And header budget.
Melting Slicks
Joined: Feb 2014
Posts: 2,409
Likes: 44
From: NC
I want to know just wtf did he do wrong to snap a timing chain...if that's what he really did... if the car's real.... I mean what kind of mechanic, can't even get the fuel pressure right? And doesn't have the sense to dyno tune the car...
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
By the time that I'm able to schedule a dyno appointment, something will probably break on the way there. This chain has 1500 miles on it with the stock heads and Isky Racing valve springs, and 500 ish miles on it with the AFR heads.
I think maybe it was a problem with the design quality. There are like 3 teeth left on the crank gear...
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
The dyno day for his hotwheels C4?
I want to know just wtf did he do wrong to snap a timing chain...if that's what he really did... if the car's real.... I mean what kind of mechanic, can't even get the fuel pressure right? And doesn't have the sense to dyno tune the car...
I want to know just wtf did he do wrong to snap a timing chain...if that's what he really did... if the car's real.... I mean what kind of mechanic, can't even get the fuel pressure right? And doesn't have the sense to dyno tune the car...
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
What is the likelihood that the problem is the PART, and not the..."mechanic"?
Last edited by Tom400CFI; Aug 11, 2014 at 05:42 PM.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
I think maybe it was a problem with the design quality. There are like 3 teeth left on the crank gear...[/QUOTE]No way. I don't buy it. In one "corner", we have a VERY reputable timing chain manufacturer, who has made chains and gears for SBC's for what, 60 years? In the other "Corner", we haver Daniel, who can't get his car to run right.
What is the likelihood that the problem is the PART, and not the..."mechanic"?
[/QUOTE]Well, how the hell do I figure out if I it installed wrong? It only goes on one way.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
You act like a mechanic and scrutinze the parts. The alignment of the gears, are there other parts floating around in your oil that were caught in your gears? IDK...you have to look. Or take it to someone who knows what to look for (a real mechanic).
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
The only thing I see is indentations of every tooth of the cam gear. I imagine that's probably a result of the chain snapping. But the chain is snapped, and the teeth were taken off... Not sure which one happened first. But whatever did probably causing the other one to break.
