1987 928 Block w/scatch
05-26-2013, 02:38 PM
#16
Track Day
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It is quite easy to relapp the cylinders for new rings, essentially preparing the surface for bedding in the rings.
It involves a paste, and some felt pads on a expanding hone or some form of one.
http://www.goodson.com/AN-30-Silicon...und_for_Honing
http://www.goodson.com/MM33-FO5_-_Fe..._Alloy_Blocks/
Last time I did this it was over 500 dollars for the block, but I think that involved hot tanking. This time I bought this stuff and will do it myself.
It involves a paste, and some felt pads on a expanding hone or some form of one.
http://www.goodson.com/AN-30-Silicon...und_for_Honing
http://www.goodson.com/MM33-FO5_-_Fe..._Alloy_Blocks/
Last time I did this it was over 500 dollars for the block, but I think that involved hot tanking. This time I bought this stuff and will do it myself.
Thanks Bill, Bilwilli@comcast.net
05-26-2013, 03:39 PM
#17
Team Owner
I guess that Bilwilli wasnt paying attention^^^^
SRSLY dont touch the bores you will damage the surface then your block will be scrap.
Doing bore work isnt a trifle thing with this type of bore surface,
your scratch isnt going to hurt anything and the engine will run great for many miles.
If you choose not to follow this advice then you may experience the piston seizing or low compression , due to the surface being removed
NOTE the pistons are fitted to the bores in certain size clearance groups, honing will change the bore diameter slightly depending on how much of the surface is disturbed,
not to mention that the surface may not be returned to that required for long term operation.
SRSLY dont touch the bores you will damage the surface then your block will be scrap.
Doing bore work isnt a trifle thing with this type of bore surface,
your scratch isnt going to hurt anything and the engine will run great for many miles.
If you choose not to follow this advice then you may experience the piston seizing or low compression , due to the surface being removed
NOTE the pistons are fitted to the bores in certain size clearance groups, honing will change the bore diameter slightly depending on how much of the surface is disturbed,
not to mention that the surface may not be returned to that required for long term operation.
05-26-2013, 04:14 PM
#19
Rennlist Member
05-26-2013, 04:24 PM
#20
Isn't it telling how you make the conscious choice, when you disagree with someone, you choose insulting their listening skills or reading comprehension and throw in some fear mongering. Very telling indeed. It seems you are up to your old passive aggressive ways.
Do you understand the facts and science of the lapping process? Are you fundunobtainable. isunderstanding what is done with the felt pads and an-30? Why don't you go study it before you suggest any other false information.
Its a basic process that removes no bore size changing material, but prepares the bores for new rings. Without it the new rings have a much lower chance of seating. It etched some aluminum to allow the silicon to stand above it. This is the point. It's a common practice on many alusil blocks and not just ours. Our blocks are not made out of unobtainium
There is a specific science if one is paying attention.
Do you understand the facts and science of the lapping process? Are you fundunobtainable. isunderstanding what is done with the felt pads and an-30? Why don't you go study it before you suggest any other false information.
Its a basic process that removes no bore size changing material, but prepares the bores for new rings. Without it the new rings have a much lower chance of seating. It etched some aluminum to allow the silicon to stand above it. This is the point. It's a common practice on many alusil blocks and not just ours. Our blocks are not made out of unobtainium
There is a specific science if one is paying attention.
I guess that Bilwilli wasnt paying attention^^^^
SRSLY dont touch the bores you will damage the surface then your block will be scrap.
Doing bore work isnt a trifle thing with this type of bore surface,
your scratch isnt going to hurt anything and the engine will run great for many miles.
If you choose not to follow this advice then you may experience the piston seizing or low compression , due to the surface being removed
NOTE the pistons are fitted to the bores in certain size clearance groups, honing will change the bore diameter slightly depending on how much of the surface is disturbed,
not to mention that the surface may not be returned to that required for long term operation.
SRSLY dont touch the bores you will damage the surface then your block will be scrap.
Doing bore work isnt a trifle thing with this type of bore surface,
your scratch isnt going to hurt anything and the engine will run great for many miles.
If you choose not to follow this advice then you may experience the piston seizing or low compression , due to the surface being removed
NOTE the pistons are fitted to the bores in certain size clearance groups, honing will change the bore diameter slightly depending on how much of the surface is disturbed,
not to mention that the surface may not be returned to that required for long term operation.
05-26-2013, 06:12 PM
#22
Yes you are right I would not hone the cylinders, but whats wrong with lapping them for a new set of rings..doesn't it help seat them...
http://youtu.be/-ek5qv8Nmg0
http://youtu.be/-ek5qv8Nmg0
Yes, great idea. Buy the 951 ring packs.
05-26-2013, 06:19 PM
#23
Nordschleife Master
There's no point to etching the bores if they weren't freshly bored.
Ya see, what it does is remove a tiny bit of aluminum so that more silicon shows. During operation the aluminum continues to wear but the silicon doesn't. Aluminum is soft and silicon is hard. Hard as a rock!
The bores are ready for rings now because the silicon is exposed.
Ya see, what it does is remove a tiny bit of aluminum so that more silicon shows. During operation the aluminum continues to wear but the silicon doesn't. Aluminum is soft and silicon is hard. Hard as a rock!
The bores are ready for rings now because the silicon is exposed.