EngineBuilding
I prefer my pistons and springs with a little bling
Does anyone go to this extent and why?
Discussion
i always wondered if polishing piston heads would help protect against carbon buildup
Eh, can't hurt, but the a/f mixture burning well will keep the carbon off. As well as a routine European tune-up.
It slows it down. But I think thats some type of thermal barrier coating or DLC on those pistons and springs.
Looks to me like everything is just polished
It can help against engine knocking tho
it absolutely does
E85 will keep your combustion chamber clean for you 🌽
I sometimes get carried when cleaning stuff, so when I realize that this part is hidden, I don’t even bother making it look nice but this is amazing 🤣
Polishing springs reduces the amount of microscopic stress risers and makes them last longer. Pretty much every valve spring company advertises their special finishing process on high end springs.
I do wonder how OP did the polishing, looks like a tedious thing to do.
It's normally done in a vibratory tumbler or something similar.
I haven't seen anyone crazy enough to hand polish entire sets of springs yet
This my thought similar to folks who get under the feet tats 💀
😂😂😂😂
Rule 10. No NSFW/NSFL content of any sort.
Sex on an engine stand
Are those….harbor freight pistons?!
Don't think i wouldn't run them if it was an option.
TEMU
Kachow!
Molnar is sorta budget, right? The whole build looks spectacular, and I'm sure those will hold up to a decent amount of abuse. Any forced induction planned?
Power adder plus rods....1,000+ I think more, but don't get me lying. Maybe I'll look it up.
They may be a budget priced rod, but they're top tier performance. In my opinion. I'll take an aluminum rod over this Molnar though.
Right now it's NA 7,300 to 7,500 rpm. I'll look for the graph or printout in a little while. Nitrous for sure.
Love those intake runners!!
What is this going in?
1st Gen camaro.
Oh nice!
R/engineporn
GOTDayum that's Purdy!
Took him a month of Sumdays to polish them internals...or let his wife do it proper!
😂😂😂 15 minutes per piston when you have the right equipment.
The springs are BTR that come polished.
Rule #1:
Chrome won't get you home.
Where chrome? Me no see chrome...
Idk i'm just having fun. Carry on.
Me too
…but it might get you laid.
Iced out 🥶💎
I would cook an egg on that piston
Make it over easy and you're hired.
I like your steam tubes
Ah yes...EARL'S
Gotta keep those pistons shiny so you can see a little glitz down in the spark plug holes when you change them.
The plug gets bored never going anywhere. So anything it's gonna look at ought to shiny
Sexy!
Mr Sam?
Oh shit!😂😂😂😂
curious what car will receive that gem.
1st Gen camaro
very deserving, will make a sweet rod.
Bruh, this needs a NSFW tag! Opened your post in the office, now I’ve been told to report to HR.
😬 I take no responsibility
She's pretty.
I dont think I could ever polish a crown, the ocd in me will hate to think the minuscule difference it would make to the volume because you would never get it with just polishing alone
Maybe 3 tenths of a thou.
yea but they will be all different
Within a tenth. 1 thou is a human hair. Slice that 10 times.
There is no way to be sure, that is the problem. Why bother measuring CC's when you have this anomaly
Because as mathematically precise as it should be, the stack of tolerances will always have room to work. The volume must be calculated to ensure the performance of the engine. If you're off by 0.0025" in total crown height across 8 pistons, that may equate to a compression ratio of 11:1(actual) vs. 11.0007:1(targeted).
I can live with the big number. That's all that matters.
I agree that the volumetric change from polishing a piston crown is negligible. I did some quick math (Assuming flat top piston, zero deck; and ignoring gasket, piston clearance, ringland to crown, etc.)
A 4.00" bore x 4.00" stroke with 75cc chambers gives 11.987:1 C/R.
Taking .001" off the piston crown adds a .206cc to the cylinder volume, which results in 11.957:1 C/R.
So a C/R difference of 0.03
That said you're not taking that much material off through polishing, and even if you did are you going to have that much of a difference in material removed between pistons? Doubtful unless you're "polishing" with an angle grinder.
Exactly, and THANK YOU!
you can get tool marks out with just polishing??? Emry paper is involved
How are you so sure its 1 though, 10 or 15 thou? Why bother CC'ing to 1ml then?
No emory "paper". You'll have to try it yourself. You'll laugh at yourself once you see . The piston is a forged 4032 alloy. That matters a lot. You've probably not considered the difference. Experience it.
You'd have to experience it to know how stupid it is to question it. So little is taken off to achieve this finish.
Seriously, the pics don't do the pistons justice. When you've been polishing a while, the color matters and by the eyeball.....they start too look the same. Then the measuremnts back it up to within 0.0001".
Lookin sharp. 😎
Actually very radius! Every where. Just look at the valve reliefs. When's the last time a piston came like that off the shelf?
Never
Polish the crank,Nascar tech
That's a lot more involved, but I have done it.
I just syphoned my fuel line to this 🤤
Down to a trickle
I wonder if the polished pistons have any benefits?
Yeah....compared to the way they came. Although it's not the polishing, that everyone is drawn to. It's the edge radius and lack of sharp machined edges.
Look at the valve reliefs of these Icon pistons. I should have posted before and after. Every piston manufacturer does debur to an extent. I go further and radius and relieve all stress risers. Then I go further further and polish out the scratches left behind. There's more benefit doing this to an OEM piston.
Nope
The shine, no. The smooth finish of all edges yes. Must not handle new pistons very often?
No, I really don't. As a matter of fact it's been a hot minute since I've played with any part of an engines rotating assembly 🙃
Sorry to hear that.
Well what I'm getting at is, if you're not careful you can cut yourself pretty damn good on almost an edge of these pistons. If not for just that....there's a benefit.
And I meant that comment for the "nope" guy
Nope
Smh and 🤦♂️
Well, if that "Nope" was rephrased as a sincere question I'd....nvmd.
Putting that much effort into something nobody or very few people will ever see is true passion and workmanship
Thanks, but with the right tools, the effort is minimal. The real advantage here is the smooth radiused edges. ALL sharp machined edges are gone. Look at the valve reliefs and compare to a new piston. Shit I'll just post it.
Oh my !
This guy builds.
Drippy wet dreams I instill in others minds that they themselves can't understand....sleep well my son
And thanks. I do.
Love seeing things done well.
But when they are exceptional……
Oh STOP!
Now you need clear valve covers to show off those springs
Ha! Laugh, but I looked! 8 or so years ago I attended a seminar and the demo engine had an acrylic oil pan. I had the guys card. The company that made the clear pil pan went under, but damn it if a 212cc Honda can have a clear cover.....
Your camera lens is dirty
It was squinting...
My God that is clean
What’s the deal with the chrome / mirrors polished springs?
Well, EVERYONE has failed to notice the radius on the valve reliefs. That's where this all started.
The ICON piston is SHARP everywhere. So I radiused everything and I like to polish the crown since it gets scratched in the process. I have no clue if this resists detonation better, but at 11.5:1 on 93, I hope so.
Ok, but why the chrome / polished springs?
OH! Sorry....wrong reply to wrong person.
The answer you're looking for us in here somewhere. Basically stress relief. Springs last longer and shed the oil and heat quicker more efficiently. This process is done by the spring manufacturer.
Ah, ok. Thanks.
Stress relief. That spring is moving a lot. All the help it can get.
Damn, I’m gonna have to shoot high on my 5.7 hemi bottom end to beat this next winter.
Nice, I might have a block polished by then.
Sema special?
If it looks good enough.
Jesus... I'm curious how much is one piston?
The icon piston is $107 but not like this. They have to be dropped shipped to the magician for this treatment. Deposit of first born child....
I hope you don’t polish the intake runners.
Would I do that? Hmmm...I'll post the heads in a few.
Maybe it's direct injection
Not sure where DI would go with those fancy steam pipes in the way on top of the intake valley plate.
Side of the head near the exhaust ports
I'm not talking about the injectors, I'm talking about the plumbing and the HPFP.
I mean it's not completely assembled.
So you’re saying you didn’t look at the photos?
We never get a shot of where the DI would go.
Are we looking at the same motor?
I think you’ll keep arguing this so I’ll stop it here. Thanks for playing.
Are you sure about that? The picture is of the injectors and fuel rails of a direct injected lt4
Not me
Would never get around to polishing the pistons if you didn't intend to balance them and the rods afterwards as you polish off different amounts of material on each piston = imbalance, the second reason is any residues of polish that can cause problems with deposits, seizing piston rings etc when burned by the heat.
You don't have a clear grasp of how these things are done. I know, because you wouldn't make such a statement.
The rotating assembly is balanced up to 2g of imbalance and as little as one gram. Chasing after less than 1 gram is a rabbit hole Alice wouldn't fall into.
I knew that someone someday would think themselves a Stephen Hawking. I collected the dust the best I could in a clean contained environment. The amount from 1000grit to 7000grit paper was hard to collect, but approximately 8 thousandths of a gram total was collected. No way to measure what the Rouge took.
If you've ever balanced pistons you'd know just how comical getting a tenth of a gram is.
The residue of the Rouge removes with hot water over 90°F. My faucets dish out 123°F. Very clean afterwards.
Nice thinking smart ass. Get some experience and put some more milk in your cereal.
Please, I can only get so erect!
Wait till you see the combustion chambers.
I just combusted.
I just bent my valve
I just blew my rod.
Currently cranking my shaft
Come bust churn chambers*
Can I fist those bores? 🤣👊
You have to wear long sleeves.
Keep up the dirty talk
I just clogged my egr
Mmmmm, running richer now.
Man lives on the edge
Is the sylinder wals also polished, than it wil be less friction for the rings😅😂
At 9lb/ft of turning torque, polishing the cylinder walls wasn't necessary. Some work to the ring pack was though.
I just Sooted myself