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| Northstar rebuild: Will style (Page 27/119) |
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JCW
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JAN 10, 07:04 PM
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| quote | | Originally posted by 86 FIERO GT: You know, your doing so much work on this motor and what happens if it goes pop? |
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You find out why it went "pop" and build it better the next time...
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MaxCubes
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JAN 10, 07:45 PM
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Wow.....this thread started in December of 03...... Not an easy rebuild I guess.
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Fiero1Fan
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JAN 10, 08:11 PM
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| quote | | Originally posted by 86 FIERO GT: You know, your doing so much work on this motor and what happens if it goes pop? |
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That's mean.
------------------
The Steel Lady: Pix to follow........ Crush the Colts!!!
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Will
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JAN 10, 10:21 PM
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| quote | | Originally posted by 86 FIERO GT: You know, your doing so much work on this motor and what happens if it goes pop? |
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It won't. 
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THE BEAST
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JAN 11, 12:50 PM
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Thats right, IT WON'T ! JG
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86 FIERO GT
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JAN 11, 06:36 PM
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How is that mean? nothing is bulletproof you know, I was just askin because thats alotta tedious work on a motor to miss a shift or something go wrong. Ya know it isn't always human error all the time. [This message has been edited by 86 FIERO GT (edited 01-11-2006).]
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Will
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JAN 11, 11:38 PM
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Rotating assembly and valvetrain will both be good to at least 8500. The rev limiter in the factory based chip is in the 6400-6700 range. A 3-2 upshift at 6400 would give me 9500, but I think I'm a good enough driver to not complete a 3-2 upshift. Besides, you can blow up just about anything by over revving it enough. A journalist even managed to toast a Carerra GT engine by picking out the wrong gear.
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THE BEAST
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JAN 12, 12:46 PM
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Will
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FEB 02, 06:00 PM
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Eagle rod cross section:code:
0.985"
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0.082" |________ _________|
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0.445" | |
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|____________________| 0.177"
Cross sectional area of the beam: 0.240305 in^2
For estimation purposes, I'm going to use 0.240 in^2 in my calculations.
I will calculate piston acceleration at 8500 RPM with 3.307" stroke and 5.943" connecting rods. I will use the mass of the piston, pin, rings and small end of the rod to estimate tensile stress on the rod shank. Using 30-33 million psi as the elastic modulus of 4340 steel, I will estimate rod stretch at my intended redline RPM. I will use measured block deck height and head gasket compressed thickness to determine how much room I have and tell CP what the compression height of the pistons should be so that I have a VERY tight quench at redline RPM.
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bryson
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FEB 02, 08:06 PM
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It's nice to see someone going the extra mile, instead of just saying, "zero deck pistons, .040 compressed HG, I'm good to go" (which I did, btw). I'm assuming you're going to account for the thermal expansion of the rod and piston, as well as the block and head? Everything's aluminum except the rods, pins, crank, and sleeves (those may not make a difference), so that shouldn't be too difficult. Excellent job! Post up the math, if you don't mind!
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