Valve clearances on a modded engine
- Sorf
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15 Dec 2012 20:19 - 15 Dec 2012 20:20 #563113
by Sorf
Valve clearances on a modded engine was created 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?
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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- peter1958
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15 Dec 2012 20:23 #563117
by peter1958
Replied by peter1958 on topic Valve clearances on a modded engine
same as reg motor
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- Sorf
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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.
Just wasn't sure whether or not things may need to be changed a bit from standard.
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- woodman
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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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- webdesignservice12
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16 Dec 2012 06:28 - 16 Dec 2012 09:35 #563193
by webdesignservice12
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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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- turboking
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16 Dec 2012 12:46 #563198
by turboking
2005 Kawasaki mean streak
2000 325 H.P. mcXpress turbo Hayabusa
1979 kz 1000 mk II ATP turbo
1975 Z1 960 cc Mr. Turbo
1975 Z1 1428 big block ATP turbo
1976 Kz900 1103 cc ATP turbo
1985 GS 1150E
1983 GS 1100E
1997 Suzuki Bandit 1200S
2001 Kawasaki EX 500 Ninja
1972 Honda cb750 (836cc turbo)
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.
2005 Kawasaki mean streak
2000 325 H.P. mcXpress turbo Hayabusa
1979 kz 1000 mk II ATP turbo
1975 Z1 960 cc Mr. Turbo
1975 Z1 1428 big block ATP turbo
1976 Kz900 1103 cc ATP turbo
1985 GS 1150E
1983 GS 1100E
1997 Suzuki Bandit 1200S
2001 Kawasaki EX 500 Ninja
1972 Honda cb750 (836cc turbo)
The following user(s) said Thank You: wireman
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- Sorf
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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
Thanks
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- Sorf
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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
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?
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 shim | TDC - Lobes facing away from each other | |||
Cylinder | Intake | Exhaust | Intake | Exhaust |
#1 | 0.05 (0.002”) | 0.11 (0.004”) | 0.08 (0.003”) | 0.12 (0.005”) |
#2 | 0.06 (0.002”) | 0.11 (0.004”) | 0.07 (0.003”) | 0.17 (0.006”) |
#3 | 0.08 (0.003”) | 0.14 (0.005”) | 0.08 (0.003”) | 0.23 (0.009”) |
#4 | 0.08 (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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