How to Balance Rods and Pistons: Alex's '70 Duster Build Ep. 10

#440swap #bigblockbuild #70duster Things get technical as we start to precision machine the components of the rotating assembly for Alex's rad 440 build. Roger starts by getting a proper chamfer on the rod bushings so that there are no sharp edges to catch and gouge the pins. Once we chamfer them, we prep the bushings and get them bored. This process will get the bushings bored over 2/10th of a thousandth of an inch to give a little rooms for the piston pins to fit through and allow for heat expansion during operation. Once all rod bearings have been bored, we started weighing all of the pistons- finding the lightest one and then carefully removing material from each one to match them within a gram of weight of each other. Once they are all weight balanced, we repeat the same process on the rods. Now that the rods and pistons are weight matched we can get the crank on the balancer and then replicate the weight of all the pistons, rings, pins, oil and rods. Proper balancing like this is tedious but necessary for a performance build to make sure the engine spins internally in perfect harmony and no power is lost, and no unnecessary wear occurs.
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fanellirestora...

[@stoneyswolf]

My pistons and rods were all weight matched right out of the box. Made it easier for the guy balancing the rotating assembly and cheaper for me.

[@FanelliRestorations]

Yeah so we’re these, fine for a standard build but for a high performance build their tolerances still weren’t close enough.

[@slomocalzone]

This is interesting to watch, Frank. I’ve never seen a machinist work before.

[@FanelliRestorations]

It’s way cool and fun to learn along with him, I get the inside view and share it with all of you!

[@moparrmama]

🔥🔥🔥🔥

[@ericwright5419]

What was the wrist pin clearance

[@ericwright5419]

So much for deburring Pistons 😂

[@1962pjb]

Does he dynamically balance crankshafts there as well?

[@FanelliRestorations]

Sure does, coming up in the next episode! He actually just retrofitted his old manual balancer to a digital one so excited to see it in action

[@1962pjb]

@@FanelliRestorations Cool! Looking forward to watching that video.👍👍

[@ChiefCabioch]

This is absurd, trying to achieve perfection is impossible, you can't judge the difference between oil under the piston on the up stroke verses oil on the down stroke, and it's made even harder by engines using piston cooling nozzles, you are wasting time and money...