Valve clearances on a modded engine

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15 Dec 2012 20:19 - 15 Dec 2012 20:20 #563113 by Sorf
Hi all,
I'm planning on swapping out my chromed cam cover for a polished one and intend to do clearances while it's off, but have a question regarding that.
The motor in my Z1-A is modded, but I don't really know the extent of things as it's never been fully dismantled since I've owned it.
Last time I had the cam cover off though, I ran a dial gauge over the cam lobes and from memory the total lift was 10.2mm (or so). The cover has also been "cleared" for that reason.
So would I be looking for clearances as per an original motor or are they likely to be different for the bigger cam?
Last edit: 15 Dec 2012 20:20 by Sorf.

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15 Dec 2012 20:23 #563117 by peter1958

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15 Dec 2012 20:33 #563120 by Sorf
Replied by Sorf on topic Valve clearances on a modded engine
Thanks, you can tell I'm no mechanic!
Just wasn't sure whether or not things may need to be changed a bit from standard.

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15 Dec 2012 21:06 #563128 by woodman
Replied by woodman on topic Valve clearances on a modded engine
This is my own personal preference, if its a big bore motor I like to run a little more like .006 because of the extra heat

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  • 4TheKZ1000
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16 Dec 2012 03:27 #563177 by 4TheKZ1000
Replied by 4TheKZ1000 on topic Valve clearances on a modded engine
Web Cams requires .006 valve clearance on a .395 lift cam Im running.

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16 Dec 2012 06:28 - 16 Dec 2012 09:35 #563193 by webdesignservice12
Replied by webdesignservice12 on topic Valve clearances on a modded engine

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Last edit: 16 Dec 2012 09:35 by Patton.

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16 Dec 2012 12:46 #563198 by turboking
Replied by turboking on topic Valve clearances on a modded engine
cammotion , webcam, kenny harmon, andrews rc engineering , V&h. and most other after market cam shaft manufacturers give lobe clearance specs of .006 to .008 COLD for air cooled engines. i set my Z1 and suzuki stuff @.006 (Int and Exhaust) .008 does make the clatter more noticeable when using a thin valve cover.. I would not run .004 on aftermarket cams. (just my .02) better to be loose than too tight and burn an exhaust valve.

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17 Dec 2012 07:41 #563344 by Sorf
Replied by Sorf on topic Valve clearances on a modded engine
Good work guys! I'll go with what's being said then.
Thanks

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13 Jan 2013 00:37 - 13 Jan 2013 01:15 #567078 by Sorf
Replied by Sorf on topic Valve clearances on a modded engine
OK so I need a bit of help here :unsure:
I thought clearances needed to be measured as the largest dimension?
Also thought this was meant to be with the cam lobe facing vertically up from the shim?
But I'm finding the greatest measurement is at TDC (with the lobes facing away from each other)
Which one do I use as the clearance?
There doesn't seem to be any relation to the two sets of measurement either....would this be due to cam wear or just how it's ground?

Lobes vertical to shimTDC - Lobes facing away from each other
CylinderIntakeExhaustIntakeExhaust
#10.05 (0.002”)0.11 (0.004”)0.08 (0.003”)0.12 (0.005”)
#20.06 (0.002”)0.11 (0.004”)0.07 (0.003”)0.17 (0.006”)
#30.08 (0.003”)0.14 (0.005”)0.08 (0.003”)0.23 (0.009”)
#40.08 (0.003”)0.07 (0.003”)0.10 (0.004”)0.06 (0.002”)
Last edit: 13 Jan 2013 01:15 by Sorf.

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