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Practical Engine Building - Rods Big end clearance

Practical Engine Building

Discussion and questions related to the course Practical Engine Building


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I have not seen you do Big end side clearance measurements for the Connecting Rod, if you find yourself in a very tight clearance do you use the linishing machine to remove material on both side of the rod?

For example it happens to me with the Manley I Beam Rod for 4g63 that it gives me a clearance of .008 "but Manley sheet says that it must be .015" to .025 "so I would have to remove material to reach that tolerance

Yes, or surface grinder, etc. With care, a fine flat file should also do the job.

Good to know, but isn't .015 "to .025" too loose? I read Andree's reply on a forum that uses around .010 "

Now Manley sheet says: Side Clearance should be a minimum of .015" to a maximum of .025" (PER PAIR) what per pair meaning?

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That may be a generic clearance, biased towards larger V8 engines - your supplementary question backs that up as the "per pair" refers to when two connecting rods are fitted to the same crankshaft journal, as is normal practice with "V" engines and refers to the total clearance then.

Good, now make sense, thank s Goes.