School me on compression releases
No one I know has compression releases. I'm trying to understand why they are necessary and how they function, and the difference between manual and automatic releases. Anyone?
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I don't have compression releases but they are use to make starting easier releasing compression to allow engine to spin over easier especially on hot starts. Higher compression engines or I have heard of guys with SE255 cams running them. Automatics are electronic and operate on their own, manuals you have to reach down by the spark plug and operate them.
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The larger the displacement (and compression), the harder it is to start, especially when hot.
103's have automatic compression releases stock. Unless you're going a build above 96, you likely dont need them. http://en.wikipedia.org/wiki/Compression_release |
I had them installed when I went to a 103 from a 96 and the 255 cams. It was cheaper to do it at the time of conversion since the heads were off. Turns out I needed them. When the engine is hot, it doesn't start easily without them. I put the manuals in. No big deal to reach down and push the buttons. Have to be careful not to touch anything else. It's all hot.
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The automatic releases are actually built into the cams.
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Originally Posted by usraptor
(Post 13708866)
The automatic releases are actually built into the cams.
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I now have manual CR. Had them installed when I upgraded to 107, my 2nd upgrade. When I went from a 96 to 103 for my first upgrade with woods tw555 cams and no CR, I had trouble starting my bike when it was hot. The bendix drive in my starter paid the price. Now after upgrading to 107 with CR I have no trouble starting and my starter thanks me every time I use it.
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A compression release is actually a small hole in the compression chamber that allows the engine to turn over more easily when cranking due to high compression pistons or a hot engine. Once the engine is started the releases close up allowing normal operation. There, that's it in a nutshell.
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Old Hippie is correct. I stand corrected. Sorry for any confusion.
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Lots of great responses here. Let's say I bump up an 88 to a 95 keeping but keep compression the same. Let's also say I send the heads out for a street port. Is the cost worth it?
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