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| Rocker clearance question https://www.ausmini.com/forums/viewtopic.php?f=2&t=35904 |
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| Author: | Kurross [ Wed Sep 19, 2007 7:03 pm ] |
| Post subject: | Rocker clearance question |
G'day, I adjusted the rocker clearances on my 998 last night, I followed the instructions in the "do-it-yourself workshop manual" (SP manuals). And it was actually quite a lot easier than i thought it would be. However, today i thought i might do a search on here to see how others did their, this is when i noticed all the posts said the clearance should be .012", i did mine at .019" as per what i read in book?? So ive just got home and checked the book again, it says : Rocker working clearance .... 0.012 Rocker clearance for Valve timing ....0.019 (which i used) Obviously i'll change to 0.012 as this seems to be the correct one, but could anyone tell me the difference between the two? (and no smart arses saying 0.007) Cheers |
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| Author: | drmini in aust [ Wed Sep 19, 2007 7:14 pm ] |
| Post subject: | |
Normal rocker clearance installed (stock cam) is .012" cold or .011" hot. The .019" is used when checking cams for comparison with others. Some BMC race cams are .021". BUT it's not a running setting. However, many sports cams run more than .012". eg a Cooper S uses .015" for competition, Kent cams are usually .016", so are Graham Russell's RE13 cams. These figures are for the stock rockers. If Hi-lift 1.5:1 rockers are used, add .003" to these numbers. 
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| Author: | Kurross [ Thu Sep 20, 2007 8:39 am ] |
| Post subject: | |
Thanks for the response, I'll adjust to .012 on the weekend, drmini in aust wrote: 019" is used when checking cams for comparison with others.
I'm just a little curious what you mean by above (i'm still pretty much a noob when playing with engines), so how does adjusting to .019 check/compare the cam? Cheers |
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| Author: | graham in aus [ Thu Sep 20, 2007 10:07 am ] |
| Post subject: | |
Kuross, I believe that you use the 0.019 when checking cam profiles, i.e. duration, lift etc. This is a standard clearance to minimise the initial 'ramp' on differing profiles, particularly when dealing with reground and racier profiles. You would not actually run the car with this gap, just measure! 
Am I right kev?
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| Author: | Kurross [ Thu Sep 20, 2007 11:20 am ] |
| Post subject: | |
righto thanks for that, i think i get it now. |
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