Measuring For New Piston Rings | Chevy 350 Budget Build #2

This is video #2 in our series where we are building a mild (but more than stock) cammed, four-barrel carbureted daily-driver engine on a high-school budget.
In this video we continue the teardown and inspection of the engine and measure the wear in the cylinders to determine if we need to do machining and what size rings we'll need to order using inexpensive and common garage tools.
Tools used:
Dial Calipers: amzn.to/3rUmeV0
Feeler Gauges: amzn.to/3sTp6mz

[@philliphall5198]

It’s fun watching you do this after all the years I done it

[@MrGoldman9]

I would like to thank you for this more than wonderful video, as it is the first video I have seen that explains in all simplicity, accuracy and ease at the same time, without complication or a large number of explanations with the secrets of experience in the details. Therefore, I hope that you will continue to make brief explanations that benefit the person who wants to work on his own.

[@KidKey59]

love your channel mate good stuff

[@TubeInspire]

Thank you for the awesome information for a firat time builder

[@jasonolds7611]

Good video!

[@gprice932]

Great video

[@rebuildit]

Great video, thanks!

[@richertbompart8485]

Thx so much!

[@silentman84]

good stuff thank you

[@bobtee7899]

DIY Boss!

[@101trayday]

Could you do a video on how to measure main and rod barrings

[@YoshimoshiGarage]

How about this one? kzbin.info/www/bejne/pKW5h2p_lp6EZ7M

[@georgesam7805]

Man. I thought your other video doin the hone job was good. This one's even better. I bet your regular job is in politics or something like that. It has to be. This is funny stuff. Keep it coming. I always could use a hood laugh at the end of the day. FYI......9 times out of 10 the ring land on a used piston like these gets broken when you remove the piston from the bore. The ring can't compress over the step that your measuring and it cracks the piston ring land where you can't ever see it. Still....great video. Keep 'em coming. !!

[@YoshimoshiGarage]

I get it. Math is hard for some people.

[@joe-hp4nk]

Ring gap is .005/inch of bore, or there abouts.

[@ct1762]

that sounds like a lot. 20 thou for a 4 inch bore? 2 strokes must be more like .002'' per inch

[@theshrunkenanus3925]

@@ct1762it’s probably +.040 bored over.

[@matthewcotgrave1784]

I’m confused, im working on the same motor 350 chevy and have the measurements as follows (piston has 030 on the top and head measures in at 3.992 cylinder measures in at top 4.022 Top (unworn) - 47 Mid - 51 Bottom - 52 But I have no clue how to do the calculations you described ? I don’t know what rings to order 🤦🏻‍♂️🤦🏻‍♂️

[@YoshimoshiGarage]

The increase in diameter is the gap difference divided by 3.14. If I'm understanding your measurements, your gap difference from unworn to worn is 0.005" (52-47). 0.005 / 3.14 = 0.0016". If the pistons are stamped 030, we know the "unworn" bore is 0.030" oversize, and it's now worn to 0.0316" oversize, which is not much, Rings likely come in 0.030 and 0.040 and 0.040 would not fit, so I'd just go back with 0.030

[@efijemuehphilip542]

Thanks for the video , please why are you dividing it by 3.14

[@YoshimoshiGarage]

Because it's the value of pi, and we're checking the diameter of a circle.

[@efijemuehphilip542]

@@YoshimoshiGarage thanks

[@healthystyle]

Should you do these measurements after you have honed the bore?

[@YoshimoshiGarage]

Honing won't take off enough material to matter, so you can do it before or after

[@healthystyle]

@@YoshimoshiGarage Thank you

[@johnsmithson2506]

Would there be a difference in ring cap after the the cylinders were hone ?

[@YoshimoshiGarage]

No. Honing takes very little off the wall, so the gap change will be very, very small

[@johnsmithson2506]

@@YoshimoshiGarage thanks for you information.

[@patpeacock8150]

Only problem see if you using a used ring how do you know how much the ring is wored

[@YoshimoshiGarage]

Since you're only measuring the *change* in circle diameter from unworn to worn area of the bore, it doesn't actually matter if the rings are worn.

[@patpeacock8150]

@@YoshimoshiGarage well if you got wear in the ring that would change the amount of ring gap .

[@YoshimoshiGarage]

Yes, but you're comparing two positions with the same ring and checking just the difference. A worn ring would give a different gap, but the difference between the two measurements will be the same

[@georgesam7805]

Man. I thought your other video doin the hone job was good. This one's even better. I bet your regular job is in politics or something like that. It has to be. This is funny stuff. Keep it coming. I always could use a hood laugh at the end of the day. FYI......9 times out of 10 the ring land on a used piston like these gets broken when you remove the piston from the bore. The ring can't compress over the step that your measuring and it cracks the piston ring land where you can't ever see it. Still....great video. Keep 'em coming. !!

[@spraym88]

Ok so the ring gap /end gap is .55 thou? On a chevy 350?

[@YoshimoshiGarage]

I hadn't really thought about it as ring gap, but yes. On this 350 that's the gap when torn apart. Bear in mind if the ring faces are worn at all that gap would be bigger than when new, but I can't think it's more than a couple thousandths

[@spraym88]

@@YoshimoshiGarage oh ok. Makes total sense! My 350 is supposedly bored .020 over, and the new rings I got were pre gapped and there .044 thou. So I checked bore size and it's 4.128! Looking for help here. That's bigger then .020 over right?

[@YoshimoshiGarage]

4.128"? If that measurement is right, that's definitely not a 350. A 350 has a nominal 4.00" bore. I think you have a lightly work 400 block, which has a standard 4.125" bore. I wouldn't expect 350 rings to even fit on the pistons.

[@YoshimoshiGarage]

www.corvetteactioncenter.com/tech/knowledgebase/article/small-block-and-big-block-engine-bore-and-stroke-chart-283.html

[@spraym88]

@@YoshimoshiGarage Sorry man my mistake! The guy I bought the block from already had New .20 over pistons in it! When I checked the rings, the end gap was .044 . Took the block to the machine shop. It's actually bored .30 over but some cylinders are hitting .032 .034 So now I have to get it REBORED to .40. Smh guy I bought it from had no idea what he was doing and I'm glad I checked

[@davidholmes5698]

What size rings you buying standard 0.10 or more 0.20 rings

[@YoshimoshiGarage]

Standard on this one.

[@davidholmes5698]

@@YoshimoshiGarage can i buy standard for mine too im rebuilding 3.8 main journal is 24 and rod is 21 it measures my bore is 035 ring gap but im not shure on that i don't have bore gauge and it cost to check it at machine shop i use old ring in. The bore the gap was 035 not shure on that is there a way with out bore gauge for true measure

[@davidholmes5698]

My bore is 3.736

[@davidholmes5698]

I can't check the bores because i broke all the rings

[@YoshimoshiGarage]

@@davidholmes5698 Without a bore gauge or good ring it's hard to be sure. I'd probably order a single piston set at STD and use those to measure, then order a full set based on the results of that.

[@joe-hp4nk]

If the barrings need to be ticker, why are they under size?

[@YoshimoshiGarage]

When a cylinder is bored it gets larger, or "over sized". When you machine the journals on a crank to get rid of damage, however, the journals get smaller, and therefore are "under sized". The bearing itself will be bigger to fit an under-size journal. "Under" and "over" are in relation to the factory measurement of either bore size or journal diameter.

[@joe-hp4nk]

@@YoshimoshiGarage Right, so thicker bearing are oversized.

[@YoshimoshiGarage]

Yes, but called "undersized" because the journal they match is undersized.

[@joe-hp4nk]

@@YoshimoshiGarage We're not talking about the journal, we're talking about the bearings.

[@YoshimoshiGarage]

Yes, but thicker bearings are called "undersized" not "oversized"

[@damnimcooltom1]

So, you're a PiD, guy? I've always been a 2Pir guy, myself.

[@YoshimoshiGarage]

I'd generally agree, except the bore on an engine is always in D, not r.

[@MrXerxes415]

Very sechsie

[@brandonknight7240]

Why does utube allow these liars to advertize $540.00 free stimulous for everyone?