Prepping Stock Big Block Chevy Rods Into some very Nice Peices

[@williamgauntt1164]

Less weight (less Rotating mass) would have to equal quicker acceleration. What do we do with the crank? Show us how you do this with the rods...

[@Myersmetalworks]

Hi Willian.... At this time I dont have a rotating assembly to polish up, and make it look nice.... When Im doing this I remove sharp edges and casting seams then running over it with a sanding rolls with a die grinder.....

[@TheJagjr4450]

Rotating mass is one thing, and yes a few ounces from the rotating is better than 100 pounds off the car weight in road racing. HOWEVER reducing the reciprocating weight is where the big gains happen. Every piston is accelerated from a dead stop 2 times per revolution. Every bit of power used to accelerate each piston pin, circlips, rings, small end of the rod cannot be used to accelerate the car. Nearly all of the gains in NASCAR engine HP from the 1990's to today is due to the reduction in piston and rod weight. The old carillos weighed something like 200 grams more than they do today and the pistons are much lighter. You run the longest rod you can get so you can get to the shortest compression height piston possible, run a 2mm zero gap ring, using a narrow pin boss. The longer rod causes the piston to "dwell" longer in the vicinity of TDC allowing higher cylinder pressure to build before shoving the piston down. - longer dwelling also helps in VE when using valve overlaps to begin the filling OR allowing the cylinder to cram and "overfill" even after the piston is beginning the compression stroke.

[@sc358.]

​@@TheJagjr4450I'd assume more of the gains came from the better inductio, straighter ports (heads/intake) and valvetrain stability. But I've only washed an axle bearing on a cup car so 😂 🤷‍♂️ Been around SB2.2, D3 and RY45 stuff as well as some retired R5P7 truck stuff sitting around (no R07 stuff unfortunately).

[@philipmazzuca2269]

If you don’t mind me asking…….. what is your business (metal fab) ? Ever consider machining and engine parts prep assembly? Hope all is well and thanks for the videos

[@TheBeefSlayer]

Other than weight reduction polishing won’t actually do anything performance wise right? Just to make you happy?

[@Myersmetalworks]

To my understanding or (what Ive read} before after market rods were avalable to most... Beam polishing the stock rods was a way to help stop stress risers or crack from forming and having a rod failure.... Weight loss and lasting longer = Good As for performance, if anything maybe help a little with windage in the pan...

[@philipmazzuca2269]

I would tend to think that the polish acts almost like a coating and may “wick” the oil off them. Your thoughts? Beautiful work as always 🇺🇸

[@Myersmetalworks]

Hi Philip.... A old timer engine builder once told me that it slinges off oil better... I have no proof it dose anything... But at least it looks good spinning around where nobody can see it...Lol To me, its value is human time spent on a part for improvement

[@TheBeefSlayer]

@@Myersmetalworks I guess if you polish out a crack that already started. Would that be right? Cause if there isn’t a crack already then you aren’t doing anything but taking away metal. Right? And yo could polish your way into a crack theoretically.

[@Myersmetalworks]

By polishing and dedurring we are trying to make the rod less prone to start a crack... Everything starts micro and goes macro. If we put a metal surface in a condition least prone to start a micro crack and micro always turns to macro, the crack will keep running until failure, so we are just trying to extend rod cycle life...