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Post by dangerousal on Apr 10, 2018 12:13:51 GMT 1
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Post by earthman on Apr 10, 2018 14:23:09 GMT 1
Interesting link that, not sure that I'd do it to my bike though, will be interesting to hear from others who have.
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Post by reedpete on Apr 10, 2018 21:48:45 GMT 1
Works but is better is to go the whole hog and have head cut and o rings added. That’s the full race proven solution.
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Post by 4l04ever on Apr 10, 2018 22:22:54 GMT 1
The article does not cover making fine adjustments by using different thickness base gaskets....which I can supply :-)
On my own bikes, I have got the squish close by skimming the head and/or top of cylinders, then fine tuned with base gaskets. You can also use thin spacer plates (0.5mm upwards) to open the gap if more then 0.8mm thickness is needed with a gasket each side, allowing for even more adjustments as the lower and upper base gaskets can be different.
My engine man has my jig for skimming cylinder tops as a pair for LC and YPVS cylinders.
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Post by reedpete on Apr 10, 2018 22:55:56 GMT 1
Absolute best on a Liquid cooled engine is to use skulls, but not really an option on an ac Head.
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Post by Tobyjugs on Apr 10, 2018 23:22:23 GMT 1
Absolute best on a Liquid cooled engine is to use skulls, but not really an option on an ac Head. If your'e on about loose combustion chambers, I've seen them for air cooled engines and it works really well. It really looks like a work of art as well |
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phil38
Thrash Merchant
Posts: 426
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Post by phil38 on Apr 11, 2018 19:18:17 GMT 1
I'd also come across that article, but seemed like a lot of faffing and a strong chance of getting leaks. I had bought a spare had if eBay with the intention of skimming it to reduce the (fairly massive) squish my standard engine has. I wasn't sure how much you can take off the head whilst retaining the head gasket without it effecting the shape of the chamber. I was planning to mill off something like 0.5mm…
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Post by bezzer on Apr 11, 2018 20:15:27 GMT 1
Out of interest, what is the optimal squish clearance for a 250/350 LC?. There seems to be a lot of reference to ‘trial and error’ within that article.
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Post by Tobyjugs on Apr 11, 2018 21:10:54 GMT 1
Out of interest, what is the optimal squish clearance for a 250/350 LC?. There seems to be a lot of reference to ‘trial and error’ within that article. I optimised the squish band to 0.95 mm on my engine and because of other problems i removed the cylinder head and put a standard cylinder head on with an original gasket. The squish band was now almost 2mm and when i rode it the difference in performance was very noticeable. I guess everyone will have their own take on this question but i would say 1mm squish and a compression ratio of 12.5:1 is good. It is very important to check the compression ratio if you are going to adjust the squish height. If the compression is too high it can lead to all sort of other engine problems and damage. |
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