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| Stealth6 |
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wow mitch...
_________________ Yep, I don't know what to write here... |
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| mitchell g |
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TROYMAN wrote: I assume there are marks on the pistons?, 2 things I think of are cam timing or to much preload on lifters,either way its f**k.. yeah a couple of burs on the edge of the relief cuts what do you mean by preload? |
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| SWC |
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mitchell g wrote: TROYMAN wrote: I assume there are marks on the pistons?, 2 things I think of are cam timing or to much preload on lifters,either way its f**k.. yeah a couple of burs on the edge of the relief cuts what do you mean by preload? How many shims did you fit? |
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| mitchell g |
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SWC wrote: mitchell g wrote: TROYMAN wrote: I assume there are marks on the pistons?, 2 things I think of are cam timing or to much preload on lifters,either way its f**k.. yeah a couple of burs on the edge of the relief cuts what do you mean by preload? How many shims did you fit? 2 standard shims as directed by cresent |
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| TROYMAN |
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mitchell g wrote: SWC wrote: mitchell g wrote: TROYMAN wrote: I assume there are marks on the pistons?, 2 things I think of are cam timing or to much preload on lifters,either way its f**k.. yeah a couple of burs on the edge of the relief cuts what do you mean by preload? How many shims did you fit? 2 standard shims as directed by cresent because your lifters/hla are hydraulic there is only a certain amount of pre load they can take before the fully pumped up lifter will push your valves open more than the cam has been designed, no pre load or to much clearance will cause them to constantly rattle.. something that should have been mentioned, that there are known to be different factory thickness shims , normally the regrind cams are based on the common std shims being either 1.7 or 1.9mm, but I have come across 1.3 and 2.2mm shims.. |
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| mitchell g |
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TROYMAN wrote: mitchell g wrote: SWC wrote: mitchell g wrote: TROYMAN wrote: I assume there are marks on the pistons?, 2 things I think of are cam timing or to much preload on lifters,either way its f**k.. yeah a couple of burs on the edge of the relief cuts what do you mean by preload? How many shims did you fit? 2 standard shims as directed by cresent because your lifters/hla are hydraulic there is only a certain amount of pre load they can take before the fully pumped up lifter will push your valves open more than the cam has been designed, no pre load or to much clearance will cause them to constantly rattle.. something that should have been mentioned, that there are known to be different factory thickness shims , normally the regrind cams are based on the common std shims being either 1.7 or 1.9mm, but I have come across 1.3 and 2.2mm shims.. hmm. but as I think it was joe I spoke to mentioned, if it was the cam at fault, it should have done it 20 - 30 seconds on first start up |
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| roughredXR6 |
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If it's been good until now, I don't think the cam or valve train is the problem.
Also don't think rpm induced damage. Mine regularly sees 6000rpm through the stock gear with performance springs, and bugger all clearance. I have had one of my falcs chew out the key on the crank and the gear slipped causing similar damage.
_________________ Ported ED XR6 head shaved too much, AU gasket, custom Crow Cam, Pacemaker 4480's, 5-speed conversion, billet aluminium flywheel, GT clutch, T.I. Performance J3 chip, custom water/methanol injection, modified BA throttle body. Paint&Panel by Barbed Wire Fence. |
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| mitchell g |
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roughredXR6 wrote: If it's been good until now, I don't think the cam or valve train is the problem. Also don't think rpm induced damage. Mine regularly sees 6000rpm through the stock gear with performance springs, and bugger all clearance. I have had one of my falcs chew out the key on the crank and the gear slipped causing similar damage. I really like to hope it hasn't done this as I was hoping to bolt the motor back together with new valves and drive it until I get enough saved up to get the DOHC conversion I'm looking at, which I 've been told to get done before the first of June or July as tougher modification laws come in, as I can't quiet remember which one I'm aiming to get it done by June first |
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| roughredXR6 |
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Grab hold of your timing chain and give it a good yank in both directions. There should not be any play.
If you have any doubts just bite the bullet and pull the timing cover off. Throwing it back together after bending valves and not knowing what caused it is asking for trouble. Think about the damage if a rocker arm or two lets go, or a valve head breaks off and lodges sideways between piston and head.
_________________ Ported ED XR6 head shaved too much, AU gasket, custom Crow Cam, Pacemaker 4480's, 5-speed conversion, billet aluminium flywheel, GT clutch, T.I. Performance J3 chip, custom water/methanol injection, modified BA throttle body. Paint&Panel by Barbed Wire Fence. |
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| mitchell g |
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roughredXR6 wrote: Grab hold of your timing chain and give it a good yank in both directions. There should not be any play. did this, this morning and the chains tight as a mother f**k and had no play |
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| mitchell g |
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does anyone know If the intake valves from a standard 98 head are the same as the tickford heads?
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| REW93N |
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mitchell g wrote: does anyone know If the intake valves from a standard 98 head are the same as the tickford heads? I think XR valves are slightly larger?
_________________ Blue blooded. |
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| SWC |
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Intake are 47mm for both XR and standard head.
Exhaust are 39mm for Standard and 41mm for XR. |
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| mitchell g |
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REW93N wrote: mitchell g wrote: does anyone know If the intake valves from a standard 98 head are the same as the tickford heads? I think XR valves are slightly larger? I know the exhaust are but I can't remember about the intake |
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| mitchell g |
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SWC wrote: Intake are 47mm for both XR and standard head. Exhaust are 39mm for Standard and 41mm for XR. cheers. might be able to do some cost cutting here... |
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