polished piston tops - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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#1 (permalink) Old 03-13-2004, 11:43 PM
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polished piston tops

In anybodys opinion should i polish my piston tops? heat coat piston tops?
zxt

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#2 (permalink) Old 03-14-2004, 08:51 AM
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Re: polished piston tops

Use the search for "polishing pistons"

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#3 (permalink) Old 03-14-2004, 09:53 AM
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Re: polished piston tops

A OK buddy , not looking for info on actual process but weather you have done it and (in your opinion is it a worth while investment).to Polish and then have heat treated???????? I appreciate the tip though (on using search ) why hadent I thought of that?



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#4 (permalink) Old 03-14-2004, 11:12 AM
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Re: polished piston tops

i heard about using paint on top of the pistons? what kind of paint?


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#5 (permalink) Old 03-14-2004, 11:30 AM
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Re: polished piston tops

http://www.zcar.com/forums/read.php?...45986&t=445986


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#6 (permalink) Old 03-14-2004, 11:44 AM
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Re: polished piston tops

polishing piston tops gives you several benefits to flow, heat reflectance, and reduction of carbon buildup, and is definitely a worthwhile thing to do, and can be done when you have the head off, which can't be said for heat treating them...you gotta take em out, which is a bit more work. Don't paint them! While you are polishing piston tops, polish the combustion chamber too, and gently ease any sharp edges, as well as smoothing the little bits of thread exposed where the spark plug comes through; and you will reduce the likelihood of pinging, which is exacerbated by little sharp edges becoming hot spots. Heat treating a cast aluminum piston is gonna be a waste of time and money....what do ya think happens to heat treeating benefits when the part is re-heated? It works for steel parts, especially forged ones, which is of course why people who need lotsa power run forged......


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#7 (permalink) Old 03-14-2004, 02:22 PM
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Re: polished piston tops

Very little gain from polishing. (piston)

Could even argue pointless.

Do smooth semi finished dome pistons.
Do remove edges that burn away in chamber.

Coatings job is to prevent heat from dissipating as rapidly into piston.


Complete waste of time on previously run pistons

And I figure there are things neglected that would benefit you more.
Please no hate mail from all the profesional piston polishers


"It must be true I read it online."
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#8 (permalink) Old 03-14-2004, 03:06 PM
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Re: polished piston tops

not hate mail....but...my dad built racing motors for years, including the motors for the Revellution funny car, and had his own dyno. He dynoed a MGB motor for my uncle's hill climber and then polished the pistons and chambers and dynoed it again. The only thing he changed was the polish, everything else was the same. He got 2-3% more power right off the blocks and then found he was able to tune more advance into the timing for a total of 5% improvement. That's free horsepower right there....all it cost was a couple hour's worth of elbow grease, and it most definitely is worth it to polish your piston tops up if you have the head off anyhow. The increase in heat reflectance on the pistons will allow you to tweak a little more advance in; if you don't do that, then no, you won't see as much of a power increase.
One thing my dad knew, was how to tweak out a motor. I had a 68 Firebird with a mildly worked 400 making 380 HP, and I thought I had it running great. I had to pull it for a blown rear seal, and my dad took it for a weekend. He tweaked it to 425 hp without replacing a single part. And apologized because he thought he coulda done more except his flow bench was broken. He did a lot of things you shouldn't try at home...., but he did a lot of things you can do at home, and when people asked him for advice all you ever heard was "polish polish polish blah blah blah"......


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Dual Weber DGV's, header and 2.5 exhaust
Electronic dizzy with G.M. HEI module
Tokico Struts/Springs, Full Poly U bushings
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#9 (permalink) Old 03-15-2004, 04:59 AM
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Re: polished piston tops

theghosttanker,

you said, "The increase in heat reflectance on the pistons will allow you to tweak a little more advance in."

This is all I know about timing advance: Initial + mechanical + vacuum advance = Total advance(full advance @ high rpm's). To do what your dad did, should one increase initial, mechanical, vacuum advance, or does it matter which? forgive me if seam uneducated in the subject (because I am]


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#10 (permalink) Old 03-15-2004, 12:45 PM
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Re: polished piston tops

thanks everyone. i was referring to stock pistons, engine is completly dissasembled. will polish but was more concerned with sending them out for ceramic heat treating.. thanks though


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