Add a decompression valve without modifying your engine (2024)

I invented this idea in my head earlier today, only to find that someone else has already made it. It allows you to use your spark plug opening for double duty, adding decompression capability.

Here's the source:
http://smccycles.com/catalog/product_info.php?language=en&products_id=305

It's very expensive. I added my decompression valve for about $15 by drilling and tapping my head cover. If you have one of those cool cnc head covers, it may not be an option.

To be honest, I don't know if this fits an HT engine, but I love the concept.

Okay, it turns out it's a more common idea than I thought. Here's another version.

http://wimmercycle.com/?page_id=1094

Here's one for smaller engines and around $140:
http://shop.pitsterpro.com/frdez-d-compressionsystem.aspx

Found this patent if anybody is interested in trying to make their own version:
http://www.freepatentsonline.com/6240888.pdf

Chris
AKA: BigBlue

I see, and now i want, and now i'm making a credit card purchase.

Just beautifully designed compression release systems.

I thank both of you for bringing these beautifully designed compression release solutions to my attention.

Here's a twin head that also has a built-in valve. I just read that you should not use the second spark plug hole as a valve location because the remaining plug will not be in a good location for firing as a single plug. I'm no expert. Just something I read.

http://www.ebay.com/itm/14087871647...ries&cmd=ViewItem&hash=item20cd069e37&vxp=mtr

jefuchs said:

Here's a twin head that also has a built-in valve. I just read that you should not use the second spark plug hole as a valve location because the remaining plug will not be in a good location for firing as a single plug. I'm no expert. Just something I read.

http://www.ebay.com/itm/14087871647...ries&cmd=ViewItem&hash=item20cd069e37&vxp=mtr

Click to expand...

That's one of Fred's. He's a seller here and the other site and will be coming out with a decompression port head.
http://www.shop.crmachine.com/Cylinder-Heads_c15.htm

Chris
AKA: BigBlue

jefuchs said:

I invented this idea in my head earlier today, only to find that someone else has already made it. It allows you to use your spark plug opening for double duty, adding decompression capability.

Click to expand...

It's wild, you'd be hard pressed to find any truly new ideas.When my bro was 15 he thought he invented turning headlights, then read in an encyclopedia that Mercedes Benz did it in the 40's.
Very cool idea that never crossed my mind, make a 2-stroke have an easy pull start.

grinningremlin said:

It's wild, you'd be hard pressed to find any truly new ideas.When my bro was 15 he thought he invented turning headlights, then read in an encyclopedia that Mercedes Benz did it in the 40's.

Click to expand...

I know this is seriously off-topic, but there exists a school of thought that there is more to our world and more to our existence than just a 3 dimensional world with the individuals thoughts isolated from others by the uniqueness of individualism, DNA and the privacy of the mind.

Some say that there are no individual thoughts and information collectively flows through the human species at a level outside of our 3 dimensional world.
It's a massively hard concept to grapple with and i struggle to accept that it could even have any truth, but there doesn't seem to be any level of unique invention attributable to the individual, because when researched, there's always someone or a group of people that have come up with ideas or concepts previously developed or discussed at an earlier time.

When you have your eureka moment; waking up in the middle of the night; thinking to yourself - that's it, i've come up with a world changing invention, is it really you, or more to the point, your mind that has created, as an isolated entity and completely on it's own, a ground breaking idea or conceptual technology never thought of before.

If the concept of "time" or the "progression through time" is stripped away so that there is no "yesterday and no "tomorrow", where does the concept of "the process of thought" start and stop; when there is no barrier to the notion of having to wait for tomorrows invention, because it's all just sitting there waiting to be accessed by your mind trapped in a 3 dimensional world and body.

It's way, way off-topic, and it's a idea that's just too hard to even grapple with.

Now i'm just waiting to wake up in the middle of the night for my eureka moment, but i suspect that when i happens it will not prove to be a unique idea; never thought of before.