The Supercar Registry - Shot peening engine block question

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- - Shot peening engine block question (https://www.yenko.net/forum/showthread.php?t=148044)

Understood Chuck. My bad.

Quote:

Originally Posted by SS427 (Post 1394368)

Thanks all for the input and yes Mark, I misworded that as it is NOT shot peening but rather shot blasting. HUGE difference!

I can see broach marks on some of the deck but not in the area that the stamping was done as it was just too pitted. I am hoping that it shows up better once blasted. I am not as concerned about the broach marks as I am the VIN stamping but will likely put a plate on it regardless just to make sure. I was also told by someone else that the rocker studs should be removed as the blasting tends to round the threads.

I’ve had many of my blocks done Rick and it doesn’t hurt the stamping 👍🏻

I decided to have mine done and to be safe, made a plate to cover the VIN. The block turned out great and no damage anywhere. Based on what I saw of the block it likely would not have harmed the stamping or broach marks but decided to leave it virgin instead.

My engine builder has a shot peen cabinet and a tumbler. On all of his higher end engine builds, they are hot washed, shot peen'd and then tumbled clean. I must say that the blocks turn out great. I was so impressed I asked him if he could do my 610 intake for my 68 and ho obliged.

It turned out great as well. I'll see if I can find a picture of my block when it was cleaned. Here's the intake before I added the correct M intake bolts.

https://preview.ibb.co/j5q3JT/IMG_8669.jpg

Quote:

Originally Posted by marxjunk (Post 1394367)

shot peening and shot blasting are 2 diff procedures..

shot peening changes the surface and adds strength and promotes stress relieving..they shot peen Z28 rods for strength and stress relief..makes the rods perform better..you can actually see what shot peening does on a pink rod..its dramatic

shot blasting removes debris and surface scale....it doesnt change it deeply on a molecular level like shot peen..

shot peen gets a a specific media and air pressure changes the characteristics of how the "grain" aligns in the structure..its actually calibrated, by shooting beads at a metal gauge, and the distortion is measured and that determines what it does..it really changes the surface look and texture....the ole.."lemme roll it around in the shot peen thing" does not work as intended..theres science to it..metallurgy

Yes there's specific media and pressure, but it is NOT rocket science, its just hitting the surface with shot and making sure you get 100% coverage,, nothing really scientific at all,, we shot peen transport catagory aircraft parts all the time,,,its just selecting the right size shot and hitting it with the flapper wheel at a certain speed and verifying you get coverage
lets not overthink this,,thats what engineers do

The biggest problem I have found with the process seems to be time in the machine
It will cause problems with the broach and stamps but moreover that too moch of a good thing will alter lifter bores and put shot in every hole that is hard and time consuming to remove . I worked in aachine shop and we used hot tank
We had a. Freinf who used.ampro and I did not like the extra work it caused. Since it has been baked I would finish with a wire brush
Nothing worse than building your engine and then to find out the lifter. Bores areessed up
Good luck

I would buy many gallons of the evaporust and find a plactic bin just big enough for the block. Line the bin with heavy plastic sheeting to reduce the amount of volume you need to fill with the fluid. Find a outdoor pool heater and put that in to get it up to around 85 degrees. Let it soak.

Remember the rusted 455 crankshaft I found for the Gramma car engine build?

https://www.yenko.net/forum/showthre...aporust&page=7

85* wine coolers, yuck! j/k ;)

Quote:

Originally Posted by ss427 (Post 1433391)

85* wine coolers, yuck! J/k ;)

lol!

For future rust issues... I've used the higher percentage acidity vinegar on quite a few things and it does better than Evaporust in my opinion. This gas tank was completely crusty and full of rust scale. It was a serious candidate for a new tank, but someone suggested the vinegar trick. I filled it, let it sit for a few days while giving it a good shake now and then. I did that three more times and this is how it came out. Not a spec of rust left. I've done it on several of my 69 parts and the results were just as amazing.

https://farm1.staticflickr.com/905/4...75dde521_z.jpg