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Underbody braces, turbos and more!

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PostPosted: Sat Jan 24, 2009 10:48 pm 
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Joined: Sat Jun 03, 2006 11:54 pm
Posts: 673
Location: Illinois
Here's a pic of Merle Showalter's 1984 patent on piston crowns. Pat# 4,471,734
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Here's Smokey Yunicks 1984 patent on piston crowns. Pat# 4,467,752
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One uses chopped lines, one uses little ramps, both accomplish the same goal. Apparently, there really is something to be had about mixing the charge well in the cylinder. Both claim more HP, reduced emissions, and increased mileage. My 2 cents is that we should pick up where they left off.

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PostPosted: Sat Jan 24, 2009 11:10 pm 
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Location: Abbotsford, BC
i wonder if someone made en engine with these pistons and as well 'singh' grooves.

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1995 Firefly 1.3 SOHC 8VALVE MANUAL
2000 Firefly 1.3 SOHC 16VALVE AUTO. Goals: full restoration, achieve stock MPG and HP or higher, finished look should be 'stealthy' and unassuming. Engine will need to be rebuilt later on to restore compression levels.


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PostPosted: Sat Jan 24, 2009 11:15 pm 
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I think the sing grooves accomplish the same thing, but only on a 1/4 of the cylinder. Picture the air fuel mix swirling around the outside of the cylinder, tripping over the slots or steps.

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PostPosted: Mon Jan 26, 2009 12:25 pm 
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Merle's piston appears to greatly increase the quench area thus hurting FE and emissions. Smokey's looks like it might enhance the squish which would be a good thing.

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PostPosted: Sat Feb 14, 2009 1:18 pm 
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Joined: Sun May 25, 2008 11:26 pm
Posts: 70
Location: Port Orchard, Washington USA
Thing about the Singh Grooves is that they are so easy to apply using a hacksaw blade and some swiss files.

Biggest change I noticed was an improvement in torque and the ability to let the motor drop to around 1500 rpm and pull away... in top gear.

I would though love to see the inside of a current F1, Indy Car, Nascar, MotoGP engine

TH


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