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  #16 (permalink)  
Old 11-26-2012, 02:36 PM
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I was told to never polish after porting when fuel will pass through because a smooth finish will not let the fuel flow freely, in a sense. It will have a tendancy to stick to the polished walls. If this is true, does it apply with carbon aswell? i take it nobody polishes with iron heads?

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  #17 (permalink)  
Old 11-26-2012, 02:52 PM
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Quote:
Originally Posted by birkey View Post
I was told to never polish after porting when fuel will pass through because a smooth finish will not let the fuel flow freely, in a sense. It will have a tendancy to stick to the polished walls. If this is true, does it apply with carbon aswell?
Yes that is true you should always leave a smooth flat surface with a sand paper finish. For the intake port at least. This does not matter once inside the combustion chamber. The piston and chamber will be way to hot for gas to stay unvaporized. Its best to use a finer 200 grit paper and keep it at rigth angle to flow helps alot.

Engine always produces carbon. Polished or ceramic coated pistons allow the carbon to blow off for the most part during each combustion event. This way you cant get too mich of a build up and effect compression ratio or hot spots for preignition.
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Old 11-26-2012, 03:10 PM
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great answers. if carbon build up is reduced why isnt this done on street engines (besides cooling issues) ?
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Old 11-26-2012, 03:44 PM
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great answers. if carbon build up is reduced why isnt this done on street engines (besides cooling issues) ?
No cooling issues actually improves cooling. It is starting to come out on new cars today. Maybe see ceramic coated pistons in new cars around 2014 or so. Once regulations make it harder to get engine to pass emmisions and fuel requirements.

Polishing is very time consuming to have your machine shop polish your stuff is just too costly.

Also new engines produce a lot less carbon. If they are tuned right it should not build up at all.
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Old 11-26-2012, 03:53 PM
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you cant polish yourself?
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  #21 (permalink)  
Old 11-26-2012, 04:24 PM
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you cant polish yourself?
Yes you can im am just saying most ppl pay to have there engine built.
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Old 11-26-2012, 05:39 PM
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so basically this is machining is done to lower cr and only not so much for hp? (obviously a gain but not major), Is this done on any other heads besides wedge?
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Old 11-26-2012, 05:45 PM
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You just showed me everything I need to know when you said "Larry whoever". Larry Widmer is way smarter than you. Or me, even.

But tell you what. You go on ahead and go against what I said, I could care less. Polish the whole thing, inside and out. REAL nice ans shiny. You cannot make a horse drink- you can only lead her to water.
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Old 11-26-2012, 06:20 PM
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You just showed me everything I need to know when you said "Larry whoever". Larry Widmer is way smarter than you. Or me, even.

But tell you what. You go on ahead and go against what I said, I could care less. Polish the whole thing, inside and out. REAL nice ans shiny. You cannot make a horse drink- you can only lead her to water.
So uh whats old larry up to these days??? Eating rice?

Have you checked out his site all the heads he shows are shined the hell up but only half polished i guess. Looks like the internet forum is not correct imagine that.
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Old 11-26-2012, 06:45 PM
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That's OK, I'm pretty sure he's doing OK. I don't much care about his diet, and I almost wonder why you would. But not quite. You went to his site? Didn't know he had one. At least that's a start. Keep reading, you will learn something. Maybe. Or maybe bolt something together, I don't know. It's a thought.
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Old 11-26-2012, 07:15 PM
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Cobalt327 you might want to go scroll on some other forums, cause I believe there is some schooling needed to take place. Haha a few others are under the impression that a polish will resist carbon aswell.
A LOT of misinformation gets repeated by people w/no real experience. They google something, and then repeat it thinking that no one realizes they're not speaking from experience. But resisting carbon build up isn't the issue, anyway. The issue is whether there's any real benefit or not to YOU.

I do not expect you to blindly believe me. But besides Larry Widmer, how's about Joe Sherman? He won the Engine Masters deal a while back. I think he- like Widmer, et al- also knows a thing or two. The thread below gives his take on polishing. BTW the title of the thread is not mine, that's what comes up when the thread address is posted (referring to & bull):

Polishing Piston Top and Combustion Chamber • Speed Talk

I'm done w/trying to convince you that it is a waste of your time (and this wasn't even your original question) except to say there are other things too numerous to mention that would actually give you an improvement that should come first.

As far as Widmer's chambers being polished, or what is on his site, I didn't know he had a site, so I cannot speak to whatever is there or not there. If you provide a link I could give an opinion.

But on a Civic he did that made 490 hp w/a little blower (no big deal), the head looks like:



Smooth, yes. Polished? No. Same thing for the pistons.
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Old 11-26-2012, 07:43 PM
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So the debate here is that it is just a waste of time? I'm getting mixed answers. It is obvious that it helps reduce carbon build up, and reflects heat. Correct? Just time and money.
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Old 11-26-2012, 08:26 PM
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Regardless of street or track, would you do it. Techinspector has a good way of removing carbon on a polished chamber without taking heads off. In previous post.
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  #29 (permalink)  
Old 11-26-2012, 09:24 PM
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I have offered my opinion, and the opinions of a couple people I consider good sources of information based on their success and experience. Nothing more, nothing less.

Again- if you have done all the other things that will without a doubt give positive results, and then you want to spend your time polishing things, then by all means be my guest.

BTW, TI has not posted to this thread.
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Old 11-27-2012, 07:06 AM
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