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CC Advertisers
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View Poll Results: compression ratio.. (see photo)
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12:1
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0% |
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13:1
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2 |
14.29% |
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14:1
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2 |
14.29% |
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10,000:1
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2 |
14.29% |
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Forgeddaboutit.. Those are ashtrays..
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8 |
57.14% |
01-03-2003, 09:50 PM
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CC Member
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Join Date: Jan 2002
Location: Northern California,
CA
Cobra Make, Engine: -Sold- Contemporary 427S/C # CCX-3152 1966 427 Med Rise Side Oiler, 8v 3.54:1 Salisbury IRS, Koni's.. (Now I'm riding Harleys)
Posts: 2,567
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Not Ranked
What should I do with these???
NOS Arias 680 gram forged pistons circa 1980.. Anyone venture a guess as to the compression ratio.. The Arias Piston box just says "MAX" where the compression ratio would normally be..
Any Ideas??
http://www.clubcobra.com/photopost/s...t=1&thecat=500
__________________
michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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01-03-2003, 10:04 PM
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CC Member
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Join Date: Aug 2000
Location: Chicago,
IL
Cobra Make, Engine: ERA 454 S.O.
Posts: 1,684
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Not Ranked
Too many other variables. I can tell you one thing, not for the street.
__________________
Jeff
“If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower.”
Mark Donahue
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01-03-2003, 10:12 PM
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CC Member
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Join Date: Jul 2002
Location: Portland, OR area,
OR
Cobra Make, Engine: Contemporary CCX33868 Sold. Just "playin' the boards now."
Posts: 634
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Not Ranked
Michael,
If the box is right, they are also for a short stroke motor. They are for .030" overbore if I'm reading right. The valve reliefs look even bigger than tunnel port size.
They would make a killer destroked 427 for track use. Just stuff them in an aluminum block, add a steel billet crank, some trick rods and a set of flowed TP heads and a radical roller cam and top it off with a serious Webber set up or injection and voila! 800hp@8500rpm!
I'd like to see one of those poked and stroked SB's keep up with it!
Those are the stuff dreams are made of my friend.
Al
__________________
"If some is good, more is better.
And too much is just enough."
--Carroll Shelby
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01-03-2003, 10:44 PM
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CC Member
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Join Date: Jan 2002
Location: Northern California,
CA
Cobra Make, Engine: -Sold- Contemporary 427S/C # CCX-3152 1966 427 Med Rise Side Oiler, 8v 3.54:1 Salisbury IRS, Koni's.. (Now I'm riding Harleys)
Posts: 2,567
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Not Ranked
Yep.. That's where I was going with it.. Not for the track though.. Good thing I opted for the .017 over 427.. 3.500" stroke.. I have the big valve heads now (medium rise with 2.25" valves) an .800 lift cam.. VVVVVVVRRRRRRRRRROOOOOOOOOOMMMMMMMMM...
__________________
michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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01-03-2003, 10:55 PM
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CC Member
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Join Date: Jul 2002
Location: Portland, OR area,
OR
Cobra Make, Engine: Contemporary CCX33868 Sold. Just "playin' the boards now."
Posts: 634
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Not Ranked
Michael,
You're a man after my own heart. You might want to think about some lower rear gears?
Just feed it some raw meat when you turn on the key for the first time!! 
Al
__________________
"If some is good, more is better.
And too much is just enough."
--Carroll Shelby
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01-03-2003, 11:03 PM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Seattle, WA,
Posts: 1,389
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Not Ranked
s**t ,that thing looks like a diesel piston sure you could street it,..........wht 115 race gas@ oh.....$6.50 a gal. ....lets see..3.2 mpg@ ...well you sure aint gonna go touring!
__________________
Foolish consistancy is the hobgoblin of tiny minds
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01-05-2003, 12:07 AM
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CC Member
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Join Date: Oct 2002
Location: Sacramento, Calif.,
Posts: 32
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Not Ranked
Michael,
These slugs are about 16.2 to 1 Ratio. Arias and Venolia used to make these for the Hi-Riser and Tunnelport racers of the 70s and early 80s.
This is one of the lost secrets of FE power. COMPRESSION!!!!!!!!
I am planing on a 510ci FE with this kind of compression next year. With the right cam, Tunnelwedge intake, offset rockers would you believe 940hp without nitous???!!!!!
Tom Lucas
__________________
Tom Lucas, FE Specialties Sacramento, Calif. 916-339-0427. Our Engines are designed and engineered, not just thrown together. I design engines for every application. From mild street engines for torque to mid type performance engines for Cobras and Mustangs too fullout Race engines for Nascar and NHRA.
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01-05-2003, 02:44 AM
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CC Member
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Join Date: Jul 2002
Location: Portland, OR area,
OR
Cobra Make, Engine: Contemporary CCX33868 Sold. Just "playin' the boards now."
Posts: 634
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Not Ranked
Hey Tom,
Why tunnel wedge and not TP heads too?
Al
__________________
"If some is good, more is better.
And too much is just enough."
--Carroll Shelby
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01-05-2003, 07:06 AM
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CC Member
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Join Date: Jun 2002
Location: Omaha,
NE
Cobra Make, Engine: ERA, 496 Tunnel Wedge
Posts: 132
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Not Ranked
Those arent as-forged pistons
Although they are high compression pieces, pistons like that are built to be shaped to the chamber. I can only imagine if someone tried to run those, every corner you see would get hot and cause preignition, **** small enough chambers it'd run on diesel LOL
I would assume they are made for tunnel wedge or highrisers, get a good shop to look at them and give you a ballpark on where they can get the compression to.
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01-05-2003, 01:45 PM
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CC Member
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Join Date: Jan 2002
Location: Northern California,
CA
Cobra Make, Engine: -Sold- Contemporary 427S/C # CCX-3152 1966 427 Med Rise Side Oiler, 8v 3.54:1 Salisbury IRS, Koni's.. (Now I'm riding Harleys)
Posts: 2,567
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Not Ranked
Thanks Tom,
I suspected they were from that whole period when the FE's were pushing 16:1.. I will stop by and see you when I get the block (Genesis I hope if they are really in production).. Otherwise These will wait until I rebuild what I am working on now.. (maybe another 10-15 years.. The newspaper these pistons are wrapped in are from april 1980.. lol.. I bet we can get these to a "streetable" 14.5:1.. WWWhhhhheeeeeeeee...
I live in Vacaville and work in Sac..
__________________
michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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01-05-2003, 07:09 PM
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CC Member
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Join Date: Mar 2000
Location: Virginia, USA,
VA
Cobra Make, Engine: Genuine original Unique MotorCars 427 S/C, with a Genuine original Ford 427 Side-oiler.
Posts: 312
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Not Ranked
Michael
I had Arias build my pistons, and my engine guy machined them to fit the chambers for a 12.5/1 compression ratio.
The Arias pieces look to be extremely well made. When we measured them, they were all within a tenth or so of identical. 
__________________
David
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01-05-2003, 08:07 PM
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CC Member
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Join Date: Sep 2002
Location: Auburn Wa,
Posts: 15
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Not Ranked
Actually the sharp edges tend to burn back and round themselves off real nice  ......seriously |
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