Removing rod /piston material in balancing - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-05-2004, 10:02 AM
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Removing rod /piston material in balancing

Hello all,

I was hoping someone might have some input as to where material should be removed when weight matching a set of pistons or rods.

Also, what abrasives are safe/appropriate to use on 5140 Steel? Hypereutectic T-6 Aluminum?

Any advice would be greatly appreciated.

Cheers

The blonde weasel
San Diego, CA
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Old 03-05-2004, 10:19 AM
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Using a belt sander you can hit the balance pads on each end of the rods. Try not to get the rod to hot. Do a little then let it cool. The piston should be pretty close. Again you can use the belt sander to hit areas around the pin bosses, the sides

Chris
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Old 03-05-2004, 11:38 AM
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It sounds like you don't want to spend too much money, but as a suggestion I would recommend a rotating balance instead. If those are decent quality pistons and rods I would think that they were already weight balanced.
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Old 03-05-2004, 11:46 AM
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The rods are already balanced to within +/- 2grams and the pistons to within +/- 1gram. I was just hoping to match them all to 0.01 grams and give the machinist a very specific bobweight number across the board, including rods, pistons, pins, rings, retainers, and bearings.

I suppose before I get into all this, I should ask what other people's experiences are with Eagle SIR I-beams... factory weight balanced to an acceptable level? My scale gets back from repairs next wednesday when I will have a chance to check the numbers myself.

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the blonde weasel
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Old 03-05-2004, 11:49 AM
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If you already are going to have it rotating balanced, I would just leave the removal to the machinist. The machinist will remove the correct amount of material.
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Old 03-05-2004, 11:51 AM
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sir rods

I just did a set of those for a big block. I think they were off like 8 to 10 grams on the big end. Also 5 of the rods were under sized in the bores and i had to hone them to fit.

Keith
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Old 03-05-2004, 12:15 PM
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k-star

did you have a set of the pressed-fit or bushed rods? I'm wondering if there could be some sort of connection.

weasel
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Old 03-05-2004, 12:38 PM
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rods

The set i did were bushed. If you put the rod on the scale and weighed the total rod they were with in 1 or 2 grams. But when you weighed just the big end they were off. I was not real clear in the first post but it was the rod bore that was under not the bushed end. Yours might be ok. I just wanted to give you a heads up to look at them.

Keith
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Old 03-05-2004, 01:05 PM
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Yep, ya gotta check EVERYTHING that ya buy, new or otherwise.It's not that the stuff is bad in design, but the finish work and machining can be pretty inconsistent. That's why you're mony ahead to have the parts checked out before doing any assembly.
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Old 03-05-2004, 03:23 PM
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I agree with checking the clearances. I checked all my rods, mains and piston clearances when I assembled my last engine.

Wouldn't the rotating balance tell you if the rods weighed different amounts? Wouldn't that show up during the rotating balance?
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