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augidog
Joined: 03 Mar 2003
Posts: 1360
Location: New Jersey
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 Posted: Thu May 04, 2006 2:22 am Post subject: heads off- how do I clean this? |
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How do I clean up these piston tops ?
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work. |
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Diesel
Joined: 03 Nov 2002
Posts: 1061
Location: Ellington,CT
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| Posted: Thu May 04, 2006 6:02 am Post subject: |
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GM Top Engine cleaner, soak and scrub with a tooth brush. Repeat until the cows come home. 
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Dan Flanagan--2002 VW Jetta TDI, 83 Mercedes 300D,83 Mercedes Euro-240D |
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macBdog
Joined: 16 Aug 2004
Posts: 1111
Location: Brisbane, Australia
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| Posted: Thu May 04, 2006 7:33 am Post subject: |
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I used an aussie product called INOX and a scourer. The scourer did most of the work tho - tops of the pistons took all day.
But hang on.. that doesnt just look like crud on the top of your pistons... it looks nasty! Is that the rsult of severe detonation?
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1979 931 with a 350 chev
1973 911E with EFI
| p-talk wrote: | I'm still convinced the word 'Porsche' makes people crazy in all kinds of ways  |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Thu May 04, 2006 8:09 am Post subject: |
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| macBdog wrote: | I used an aussie product called INOX and a scourer. The scourer did most of the work tho - tops of the pistons took all day.
But hang on.. that doesnt just look like crud on the top of your pistons... it looks nasty! Is that the rsult of severe detonation? |
It looks the same as the 3 engine blocks I've got taken apart in my garage at the moment. Its just baked on carbon debris.
Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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macBdog
Joined: 16 Aug 2004
Posts: 1111
Location: Brisbane, Australia
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| Posted: Thu May 04, 2006 9:31 am Post subject: |
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Oh ok I had very similar buildups. In the picture it looks a little concave but obviously not.
Crunchie (Dave) recommends a lubricated knife sharpening block rubbed gently on the deck to get it back to new condition.
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1979 931 with a 350 chev
1973 911E with EFI
| p-talk wrote: | | I'm still convinced the word 'Porsche' makes people crazy in all kinds of ways |
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Lizard
Joined: 03 Nov 2002
Posts: 9364
Location: Abbotsford BC. Canada
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| Posted: Thu May 04, 2006 3:30 pm Post subject: |
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razor blade, or a wire wheel but make sure you put piston to TDC before you do the cleaning.
I have seen pistons with that, but the couple of times I had my 924s head off I had no deposits on it.
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3 928s, |
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Stampedetrail
Joined: 29 May 2005
Posts: 274
Location: Fairbanks, Alaska
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| Posted: Thu May 04, 2006 4:21 pm Post subject: |
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Leave it on! It just gives you higher compression. Just kidding.
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1977.5 924 "Martini" head / New Old Stock rebuild
1985.5 944 Why? Because I can. |
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Keaton
Joined: 02 Jan 2006
Posts: 261
Location: 85202
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| Posted: Thu May 04, 2006 4:33 pm Post subject: |
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put your motor back together as is the fill your tank with gas then add 1 can of BG44K frun the tank to half fill back up and run down. i used it in my jetta after the 1st 1/4 of a tank i could feel a big difference. it the same stuff thats in the shevron gas but 30x stronger. it will clean your system and same company make this stuff you put in you oil called MOA super slick shit, i've seen a motor that has lost almost all of it oil and drive 25 highway miles to my friends shop.
http://www.google.com/search?q=bg44k&revid=1659407725&sa=X&oi=revisions_inline&ct=revision&cd=1
BG44k work in all motors |
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macBdog
Joined: 16 Aug 2004
Posts: 1111
Location: Brisbane, Australia
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| Posted: Thu May 04, 2006 4:50 pm Post subject: |
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| Keaton wrote: | | put your motor back together as is the fill your tank... |
No matter how good a gas-tank-additive engine cleaner is, its never gonna get between the head, gasket and block and clean the mating surfaces. The head and block need to be clean for the gasket to make a seal. Putting the engine back together without cleaning the deck is a mistake.
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1979 931 with a 350 chev
1973 911E with EFI
| p-talk wrote: | | I'm still convinced the word 'Porsche' makes people crazy in all kinds of ways |
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