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Jamie_F
Joined: 07 Feb 2007
Posts: 414
Location: Portsmouth
1994 Toyota Celica
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 Posted: Mon Feb 19, 2007 12:09 am Post subject: |
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| The_J wrote: | | send them to me on msn and ill host them for you. |
oi i offered first   |
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wayne451
Gagged
Joined: 16 Oct 2006
Posts: 1069
Location: Hazel Grove, Stockport
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| Posted: Mon Feb 19, 2007 12:16 am Post subject: |
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Two problems, as JamieF already knows unless he was pissed when I told him? 
I have no e-mail access.
I can only get on MSN through Meebo which wont let you send files! 
Hopefully get my camera around to my old mans this week? 
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I wish I had been lumbered with a BMW to impress the ladies as opposed to my massive cock. |
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The_J
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Jamie_F
Joined: 07 Feb 2007
Posts: 414
Location: Portsmouth
1994 Toyota Celica
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| Posted: Mon Feb 19, 2007 12:31 am Post subject: |
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| wayne451 wrote: | Two problems, as JamieF already knows unless he was pissed when I told him?
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oi im never drunk..........um, well thats a lie, im actually drunk right now |
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Stefan
Guru of 8v engines
Joined: 29 Dec 2006
Posts: 324
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| Posted: Tue Feb 20, 2007 8:47 pm Post subject: Re: Mirror polishing piston tops... |
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| wayne451 wrote: | What are peoples thoughts here?
Metrology would reduce it's theoretical surface area, hence the polished finish so less likely to absorb heat.
It is also less prone to being a recipient of carbon deposits, albeit negligable anyway, so should I bother doing it on my 5 pistons before it goes back together?
I have done plenty of self polishing (and made some metal sparkle) in the past so I can do it myself, I am just interested in your thoughts!
TBH for the time it will take me I will probably do it anyway unless someone can forward a valid case against doing so. |
You are correct in the way that mirror polishing a piston crown works. The process can reduce crown temps by 5-10 degrees C. EGT's will also rise as more heat is rejected out of the chamber. This may help spool-up. The process works best if the chambers and valve faces are also polished. With regards to carbon build up, it's effectiveness reduces with increased carbon layer build up.
For hard facts you can purchase SAE paper 902141 from www.sae.org for around £7. This process can be best described as the cherry-on-top-of-the-icing after doing stuff like oil jet piston cooling etc. |
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wayne451
Gagged
Joined: 16 Oct 2006
Posts: 1069
Location: Hazel Grove, Stockport
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| Posted: Wed Feb 21, 2007 12:28 am Post subject: |
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Cheers fella! I used to work in the aeronautical industry, hence why I knew it would be beneficial I just had no figures on the differences!
Thanks for the gen on the temps!
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I wish I had been lumbered with a BMW to impress the ladies as opposed to my massive cock. |
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