Originally Posted by jayc72 (Post 334138)

Someone should post a fake walk through on how to do this. Maybe using JB Weld and some quarters. Post it back to m.net as a successful experiment, then sit back and enjoy everyone arguing how it couldn't have worked.

Originally Posted by jayc72 (Post 334138)

Someone should post a fake walk through on how to do this. Maybe using JB Weld and some quarters.

Originally Posted by jayc72 (Post 334138)

Someone should post a fake walk through on how to do this. Maybe using JB Weld and some quarters. Post it back to m.net as a successful experiment, then sit back and enjoy everyone arguing how it couldn't have worked.

Originally Posted by Joe Perez

Actually, there may be some truth in this after all.

While searching for evidence to rebut your idea, I actually ran across an old article where something similar was successfully done by a race team in some spec series a while back. I accidentally closed the browser window and I can't seem to locate the article again (one complaint against Chrome- the History function never seems to work properly for me) but the gist of it was this:

The team in question used, of all things, US half-dollar coins. Apparently they used a small quantity of two part metal epoxy (ie: JB Weld) to attach one coin to the dished area of each piston, and then a second coin atop that. The use of epoxy apparently satisfied the problem of heat transfer, since unlike welding it provided a continuous bond across the face of the coin and did not create meaningful thermal isolation between the parts. Currency was chosen as it tends to be surprisingly consistent in terms of weight and volume, and as the amount of epoxy was both quite minimal and of course controlled by the fact that it was squished out as the coins were pressed under a weight during the curing process, they did not encounter balance problems. The copper-clad nickel construction of a 50 cent piece is apparently quite resistant to both heat and pressure in the combustion process, and the coins apparently suffered no damage during the time that they were run.

The team ran in this configuration for a nearly a full season, collecting several wins until they were finally found out during a protest. They successfully argued that they had not violated the rules, since the pistons were stock and had not been machined, nor had the head, deck, etc been machined beyond allowable limits. They were allowed to retain their points, though of course the rules were updated.

I wiki'd the specs on US coinage, and sure enough, the 50 cent piece is the largest (in terms of mass) US coin in common circulation. The weight is specified at a paltry 11.34 g, and the dimensions work out to a volume of 1.6cc. Thus, two 50 cent coins stacked would displace about 3.2cc.

Assuming an otherwise stock 1.6 engine, this would take you from 9.4:1 to exactly 10:1, which is actually a pretty good result considering the total investment of $4, as compared for $580 (plus machining) for a set of Weiscos.

This isn't what I expected to find, but it makes me believe that the fundamental idea may have merit.

Originally Posted by leatherface24 (Post 334182)

it scares me how you can fabricate something so detailed lol

Originally Posted by leatherface24 (Post 334182)

it scares me how you can fabricate something so detailed lol