Piston spacing - Alfa Romeo Forum
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(Post Link) post #1 of 6 Old 30-04-11 Thread Starter
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Piston spacing

Hi,

I'm trying to make my revision for an engines exam more interesting by applying the questions to my 2 litre twinspark.

Currently on the topic of "balancing"... can anyone tell me the spacing between the piston centres in mm? I've guessed 90mm but I'd like the exact number

Cheers

Mike
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(Post Link) post #2 of 6 Old 01-05-11 Thread Starter
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Also knowing the masses and lengths of the piston and con rod and crank would be handy :-)
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(Post Link) post #3 of 6 Old 02-05-11 Thread Starter
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OK well I did the calcuation anyway but I had to guess 3 values... Here it is if anyone is interested!

I don't think the con rod is that long, actually... But I don't know

Correction: the primary forces/moments are once per crank rotation and the secondary forces/moments are twice per crank rotation
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Last edited by Turtle4288; 02-05-11 at 13:25.
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90mm is correct for the cylinder spacing. I could probably find the conrod weight for you, but don't have a dismantled engine at hand right now to check the length
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695gr each btw...
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(Post Link) post #6 of 6 Old 24-05-11 Thread Starter
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Thank you!
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