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General Category => General Discussion => Topic started by: SmithSwede on September 06, 2015, 10:23:12 PM

Title: What the heck is on my pistons?
Post by: SmithSwede on September 06, 2015, 10:23:12 PM: Ok, here's a photo of various parts for Guzzi V7 Stone. Check out the pistons. Yes--cool dished out tops in the Heron style.

But what are those black side panels on the piston skirt?

http://search.yahoo.com/search?rewrite=72&.tsrc=apple&first=1&p=moto+guzzi+v7+engine&pintl=en&pcarrier=AT%26T&pmcc=310&pmnc=410&fr=onesearchnew&tsrc=apple
Title: Re: What the heck is on my pistons?
Post by: Vasco DG on September 06, 2015, 10:27:55 PM: Link only takes me to a search engine.

My guess is you mean the Teflon coating on the truncated skirts. It's there to reduce friction.

Pete
Title: Re: What the heck is on my pistons?
Post by: guzzisteve on September 06, 2015, 10:42:52 PM: Yes, it's not a 70's shovelhead, things have improved w/technology
Title: Re: What the heck is on my pistons?
Post by: Idontwantapickle on September 06, 2015, 11:08:42 PM: Quote from: guzzisteve on September 06, 2015, 10:42:52 PM
Yes, it's not a 70's shovelhead, things have improved w/technology
Snort!
Title: Re: What the heck is on my pistons?
Post by: Penderic on September 07, 2015, 04:03:08 AM: I think it is called DLC for diamond like coating. A hard ceramic like coating to reduce wear and friction.
Title: Re: What the heck is on my pistons?
Post by: Vasco DG on September 07, 2015, 04:04:46 AM: (Sigh!) No, it's not. It's something entirely different.
Title: Re: What the heck is on my pistons?
Post by: Vasco DG on September 07, 2015, 04:39:46 AM: See second reply. It's Teflon.
Title: Re: What the heck is on my pistons?
Post by: Dukedesmo on September 07, 2015, 04:48:09 AM: Quote from: Vasco DG on September 07, 2015, 04:39:46 AM
See second reply. It's Teflon.

In which case don't use Italian oil, my Mrs bought an expensive frying pan which I used to fry stuff in Olive oil and the Teflon flaked off... :thewife:
Title: Re: What the heck is on my pistons?
Post by: Rough Edge racing on September 07, 2015, 06:33:36 AM: Some high performance V8 car pistons have the black coating on the skirts....It's to reduce friction and I don't believe it Teflon...
Title: Re: What the heck is on my pistons?
Post by: guzzisteve on September 07, 2015, 07:19:55 AM: I hope it wasn't put on by the company that hard faces the lifters.
Title: Re: What the heck is on my pistons?
Post by: Bill Havins on September 07, 2015, 07:32:18 AM: Quote from: guzzisteve on September 07, 2015, 07:19:55 AM
I hope it wasn't put on by the company that hard faces the lifters.

[insert rimshot] You're bad, Steve!
Title: Re: What the heck is on my pistons?
Post by: Vasco DG on September 07, 2015, 08:20:56 AM: It's used on the big blocks too, has been since mid way through the V11 series.

(https://farm6.staticflickr.com/5453/17592633776_0c097bc5bc_z.jpg)
Title: Re: What the heck is on my pistons?
Post by: kingoffleece on September 07, 2015, 08:54:18 AM: Been used on two stroke snowmobiles without issue for over 12 years
Title: Re: What the heck is on my pistons?
Post by: Wayne Orwig on September 07, 2015, 09:28:20 AM: :weiner:
Quote from: kingoffleece on September 07, 2015, 08:54:18 AM
Been used on two stroke snowmobiles without issue for over 12 years

Been on 2 stroke motorcycles for 40 years. They use it not only on the pistons, but also would often put it on the rings where they rub the pistons.
Title: Re: What the heck is on my pistons?
Post by: SmithSwede on September 07, 2015, 10:51:14 AM: Thanks. Very interesting. I had no idea they did that.

Does Moto Guzzi keep this a secret to avoiding offending the Luddites?
Title: Re: What the heck is on my pistons?
Post by: Wayne Orwig on September 07, 2015, 12:03:17 PM: Quote from: SmithSwede on September 07, 2015, 10:51:14 AM
Does Moto Guzzi keep this a secret to avoiding offending the Luddites?

It is so common to do, why/how would it be a secret?