Someone check my math
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Thread: Someone check my math

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    Opeler Mercougary's Avatar
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    Someone check my math

    (a) 95mm bore w/ stock stroke 1.9L crank yields 2,652cc's?
    (b) 32mm comp ht coupled to 141.5mm rod puts me 0.4mm out of the hole. Do I offset the small end bore to accept the .927" wrist pin or mill .015" off the already flat top pistons?

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    2000 Post Club Site Supporter My location P.J. Romano's Avatar
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    Quote Originally Posted by Mercougary View Post
    (a) 95mm bore w/ stock stroke 1.9L crank yields 2,652cc's?
    95 mm bore, 70 mm stroke

    Total displacement: 1983.7 cm3


    Quote Originally Posted by Mercougary View Post
    32mm comp ht coupled to 141.5mm rod puts me 0.4mm out of the hole. Do I offset the small end bore to accept the .927" wrist pin or mill .015" off the already flat top pistons?
    It would be much easier to remove 0.4 mm from the top of pistons using lathe.
    Last edited by P.J. Romano; 4 Weeks Ago at 10:51 AM.
    Old racers never die. They just go bench racing.

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    Project 1450 supporter... Site Supporter My location RallyBob's Avatar
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    95 mm bore x 69.8 mm stroke = 1979 cc's.
    My Flickr photos.
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    '70 GT 'Bonnie', '71 Ascona 4-dr turbo - winter beater, '71 Ascona 4-dr 'Turd' - rallycar, '72 Manta Rallye - hillclimb car, '72 Ascona wagon - 'Red', '72 Manta - caged street car, '73 Manta Luxus, '73 Ascona 2-dr, '74 Ascona 2-dr - Project X, '74 Manta Luxus - factory sunroof, '74 Manta ITB racecar, '75 Manta, '75 Sportwagon, '75 Manta - racecar

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    Opeler Mercougary's Avatar
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    Ahh. now I remember. area not diameter. What is your take on the excessive rod length Bob?

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    Project 1450 supporter... Site Supporter My location RallyBob's Avatar
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    Quote Originally Posted by Mercougary View Post
    Ahh. now I remember. area not diameter. What is your take on the excessive rod length Bob?

    I get a height that's .020" higher than stock. Given that the stock piston is below deck .005" to .007", that puts you at .013" to .015" above a stock, unmachined block.
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    '70 GT 'Bonnie', '71 Ascona 4-dr turbo - winter beater, '71 Ascona 4-dr 'Turd' - rallycar, '72 Manta Rallye - hillclimb car, '72 Ascona wagon - 'Red', '72 Manta - caged street car, '73 Manta Luxus, '73 Ascona 2-dr, '74 Ascona 2-dr - Project X, '74 Manta Luxus - factory sunroof, '74 Manta ITB racecar, '75 Manta, '75 Sportwagon, '75 Manta - racecar

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    Opeler Mercougary's Avatar
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    any risk of generating hot spots by milling that much off a flat top hypereutectic? Intent is to mock everything up to deck the block, so I would go ahead and clay the valve reliefs then.

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    Über Genius My location First opel 1981's Avatar
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    Quote Originally Posted by Mercougary View Post
    any risk of generating hot spots by milling that much off a flat top hypereutectic? Intent is to mock everything up to deck the block, so I would go ahead and clay the valve reliefs then.
    Hypereutectic pistons handle temperatures better than regular pistons. They are harder, though, so any detonation would tend to do more damage.
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    Project 1450 supporter... Site Supporter My location RallyBob's Avatar
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    Quote Originally Posted by Mercougary View Post
    any risk of generating hot spots by milling that much off a flat top hypereutectic? Intent is to mock everything up to deck the block, so I would go ahead and clay the valve reliefs then.
    Nothing I would worry about.
    My Flickr photos.
    C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04, D.M.L. 9/19/50 - 6/23/10
    E.G. Sauer 2/26/66 - 2/18/10. Rest in peace big guy...

    '70 GT 'Bonnie', '71 Ascona 4-dr turbo - winter beater, '71 Ascona 4-dr 'Turd' - rallycar, '72 Manta Rallye - hillclimb car, '72 Ascona wagon - 'Red', '72 Manta - caged street car, '73 Manta Luxus, '73 Ascona 2-dr, '74 Ascona 2-dr - Project X, '74 Manta Luxus - factory sunroof, '74 Manta ITB racecar, '75 Manta, '75 Sportwagon, '75 Manta - racecar

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