01-22-2019, 01:26 PM
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#21
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Registered User
Join Date: Oct 2018
Location: North Cali
Posts: 745
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Quote:
Originally Posted by Smallblock454
Check for 996 103 033 02
Mahle piston ring kit Mahle 504 40 N0
EAN 4009026929575
Contains:
Mahle 63504, Rechteckring, Nitriert, Heigth 1,2 mm
Mahle 63745, Nasenminutenring, Heigth 1,5 mm
Mahle 65959, Ölabstreifring (mehrteilig), Nitriert, Height 2,0 mm
https://catalog.mahle-aftermarket.com/eu/product.xhtml?eid=1195707#divider
Fits:
M 96.20, 85,50 Ø, 2.480 ccm
M 96.25, 85,50 Ø, 2.687 ccm
M 96.22, 85,50 Ø, 2.687 ccm
M 97.20, 85,50 Ø, 2.687 ccm
M 96.23, 85,50 Ø, 2.687 ccm
You'll find infos about correct gap in the workshop manual.
There are also piston ring sets for overbore pistons available:
Mahle 504 40 N1
Mahle 504 40 N2
Regards from Germany,
Markus
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Thanks Markus,
This is helpful, seems the same ring set works for both 2.5 and 2.7 cars, as I thought. Unfortunately the Mahle sets are out of stock everywhere I looked at. Now I think I`m gonna go with this:
https://www.ebay.co.uk/itm/183341980498?ul_noapp=true
It`s an SPD product, which I`ve never heard about...
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01-22-2019, 01:32 PM
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#22
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Registered User
Join Date: Oct 2018
Location: North Cali
Posts: 745
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Quote:
Originally Posted by Smallblock454
Check for 996 103 033 02
Mahle piston ring kit Mahle 504 40 N0
EAN 4009026929575
Contains:
Mahle 63504, Rechteckring, Nitriert, Heigth 1,2 mm
Mahle 63745, Nasenminutenring, Heigth 1,5 mm
Mahle 65959, Ölabstreifring (mehrteilig), Nitriert, Height 2,0 mm
https://catalog.mahle-aftermarket.com/eu/product.xhtml?eid=1195707#divider
Fits:
M 96.20, 85,50 Ø, 2.480 ccm
M 96.25, 85,50 Ø, 2.687 ccm
M 96.22, 85,50 Ø, 2.687 ccm
M 97.20, 85,50 Ø, 2.687 ccm
M 96.23, 85,50 Ø, 2.687 ccm
You'll find infos about correct gap in the workshop manual.
There are also piston ring sets for overbore pistons available:
Mahle 504 40 N1
Mahle 504 40 N2
Regards from Germany,
Markus
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Workshop manual: does such thing really exist??
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01-23-2019, 01:39 AM
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#24
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
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Quote:
Originally Posted by Homeoboxter
Workshop manual: does such thing really exist??
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Yes, but it contains nothing about the engine internals. Porsche never intended techs in the field to work on these, so they never published anything.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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01-23-2019, 11:23 AM
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#25
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Registered User
Join Date: Oct 2018
Location: North Cali
Posts: 745
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Quote:
Originally Posted by JFP in PA
Yes, but it contains nothing about the engine internals. Porsche never intended techs in the field to work on these, so they never published anything.
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Yes, I have the Bentley workshop guide, which is useless for engine rebuild, Wayne`s book, and a parts list with diagrams I found on the web. That`s all I have.
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01-23-2019, 12:19 PM
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#26
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Registered User
Join Date: Oct 2018
Location: North Cali
Posts: 745
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Quote:
Originally Posted by Smallblock454
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Markus, I`d go with that too if it was in the same price range, but that`s for one cylinder..
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01-23-2019, 12:42 PM
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#27
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Registered User
Join Date: Oct 2018
Location: North Cali
Posts: 745
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Quote:
Originally Posted by Smallblock454
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Markus, I`d go with that too if it was in the same price range, but that`s for one cylinder..
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01-24-2019, 10:16 AM
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#28
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Registered User
Join Date: Feb 2018
Location: New Zealand
Posts: 59
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Quote:
Originally Posted by Homeoboxter
BYprodriver also had a fair point when suggested that if the wear is substantial I may have a better seal with the original rings in the same position than with new ones.
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Rings can rotate during their life so there are no original ring positions. Always give a light hone before installing new or old rings to help bed them in. .
Cant find the link on running in a motor but if you are using old pistons, a few squirts on the accelerator with a back of is all that is required.
Have you ever see race cars do 10000 miles as slow speed to run them in ?
New pistons, new hone, 2 - 3 heat cycles and pedal to the floor.
Quite and old video of mine.
https://www.youtube.com/watch?v=PsEFKYULNDc
Cheers Wallace
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01-24-2019, 10:40 AM
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#29
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Registered User
Join Date: Oct 2018
Location: North Cali
Posts: 745
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Quote:
Originally Posted by marsheng
Rings can rotate during their life so there are no original ring positions. Always give a light hone before installing new or old rings to help bed them in. .
Cant find the link on running in a motor but if you are using old pistons, a few squirts on the accelerator with a back of is all that is required.
Have you ever see race cars do 10000 miles as slow speed to run them in ?
New pistons, new hone, 2 - 3 heat cycles and pedal to the floor.
Quite and old video of mine.
https://www.youtube.com/watch?v=PsEFKYULNDc
Cheers Wallace
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Thanks Wallace,
Yeah, I meant the same rings to go back to the same cylinders.
What do you use for honing? Just a honing tool in a drill or you take it to a machine shop?
12500 rpm is not bad for a 4T single . What can the CB125 twin do, if the singe can be spinning like this?
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01-26-2019, 01:33 AM
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#30
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Registered User
Join Date: Feb 2018
Location: New Zealand
Posts: 59
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One of these will do, https://www.toolfactory.co.nz/products/ampro-3-jaw-engine-cylinder-hone-50-175mm-75mm?variant=39640318349&gclid=EAIaIQobChMIhN7U-pyL4AIVCSQrCh33Mg57EAYYAiABEgK7IPD_BwE
Quick hone (20-40 sec) with some cutting oil is normally fine. Just roughen up to help seal the rings.
Just think of it this way, take a sharp knife and draw it across and oil stone. Home many strokes does it need to sharpen, 6 or 12. Same with and engine, the stone tears the liner microscopically, a few slides of the piston rings beds them in .
Seen some aero engines documents where they 'lap' the rings in by hand with a piston lapping jig.
Have 2 CB125 twins and one is bored to 150 cc. I need to do my magic on the motor but that will be good for 14000+ .
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01-26-2019, 06:35 PM
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#31
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Registered User
Join Date: Oct 2018
Location: North Cali
Posts: 745
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Quote:
Originally Posted by marsheng
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Will do. Honing will also help keep oil film on cylinder wall.
I also like to play with vintage Japanese bikes, I have a TX750 Yamaha and a CB750 K1.
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