Questions Re: New Piston Rings & Refreshing Cylinders
11-25-2007, 01:53 PM
#62
Rennlist Member
if they are good looking, i wouldn even bother. post some pictures on this thread of what they look like and take a poll.
mk
mk
That's sorta what I was thinking. My search has yielded plenty of ring pliers that expand to 100mm, but haven't yet found one (in the design that supports the ring all the way around) that expands beyond 100mm that is relatively inexpensive for my one time use.
I've found another that simply opens the end gaps up w/ no lateral support around the ring. It seems that this type would be easy to over expand and break the rings; so the search continues. If anyone has a suggestion do chime in.
Additionally, and just so the question doesn't get lost, I wanted to mention it again. Has anyone had success with lightly honing or refreshing the cylinders with the drill, drill attachment, felt pad, and the silicon solution (I think it is called AN-30 or something like that)? I doubt I will attempt it myself, but if there are enough positive testimonials I might consider it. The idea of refreshing the cylinders along with new piston rings is appealing if it can be done without a pricey expense.
Thanks again,
I've found another that simply opens the end gaps up w/ no lateral support around the ring. It seems that this type would be easy to over expand and break the rings; so the search continues. If anyone has a suggestion do chime in.
Additionally, and just so the question doesn't get lost, I wanted to mention it again. Has anyone had success with lightly honing or refreshing the cylinders with the drill, drill attachment, felt pad, and the silicon solution (I think it is called AN-30 or something like that)? I doubt I will attempt it myself, but if there are enough positive testimonials I might consider it. The idea of refreshing the cylinders along with new piston rings is appealing if it can be done without a pricey expense.
Thanks again,
11-25-2007, 03:50 PM
#63
Rennlist Member
Thread Starter
The engine hasn't arrived. It will be paid for tomorrow - Tuesday. I was considering having a shop locally (where the engine is now) do the work originally. However, this thread has given me the confidence to save the money and do the piston rings myself.
11-25-2007, 04:03 PM
#64
Addict
Rennlist Member
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http://www.kukko.com/index.cfm?page=...cfm&m=2&id=143
I have larger 90-150mm version. Its bit too large even for 104mm 968 pistons but works enough well.
11-25-2007, 11:53 PM
#66
I don't think I would try that specific job at home.
11-28-2007, 02:54 PM
#67
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re: honing/lapping bores:
take the block to a shop that has experience with chevy vega blocks - same materials and process, and isn't expensive. Get the bores checked with a bore gauge - especially for top ring indentation.
take the block to a shop that has experience with chevy vega blocks - same materials and process, and isn't expensive. Get the bores checked with a bore gauge - especially for top ring indentation.
11-29-2007, 01:00 AM
#69
Rennlist Member
Thread Starter
I have provided an attachment for you guys to review. I am not considering using this particular FlexHone tool as I don't think it was intended for our cylinders, but this is the general idea. I was curious if anyone has done this with a simple felt cloth and the AN-30 Silicon solution recommended for our blocks.
http://www.youtube.com/watch?v=u9mZClv5Nfo
Again, I am not going to attempt this, but was just curious more than anything. Although I admit to not knowing as much about these engines as many of my fellow Rennlisters, it is difficult for me to imagine that it would do much harm to use this process at home; provided you exercise care and consistency in the duration, speed and action of the drill on each cylinder.
Thanks for the info regarding the Chevy Vega blocks. I had heard that they were comprised of a similar material as our blocks. I believe the machine to use is Sunnen bore/honing with the proper bit(s) if my research is correct.
http://www.youtube.com/watch?v=u9mZClv5Nfo
Again, I am not going to attempt this, but was just curious more than anything. Although I admit to not knowing as much about these engines as many of my fellow Rennlisters, it is difficult for me to imagine that it would do much harm to use this process at home; provided you exercise care and consistency in the duration, speed and action of the drill on each cylinder.
Thanks for the info regarding the Chevy Vega blocks. I had heard that they were comprised of a similar material as our blocks. I believe the machine to use is Sunnen bore/honing with the proper bit(s) if my research is correct.
11-29-2007, 02:20 AM
#70
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having just watched the afore mentioned video....
it's great for chainsaws, but NOT what you need for the 928 aluminum cylinders.
(you will notice the guy didn't even wash the cylinder with soap and water after honing....)
you will need the cylinder hone cutting tools that resemble a knife sharpening stone (three stones).
these need to be covered with felt cloths and coated with the recommended silicon e based lapping compound----this, according to the FWM's, is the way to do a final finish for rings.
short of that, take it to your local machine shop and have them do it for you.
hope this helps---
--Russ
it's great for chainsaws, but NOT what you need for the 928 aluminum cylinders.
(you will notice the guy didn't even wash the cylinder with soap and water after honing....)
you will need the cylinder hone cutting tools that resemble a knife sharpening stone (three stones).
these need to be covered with felt cloths and coated with the recommended silicon e based lapping compound----this, according to the FWM's, is the way to do a final finish for rings.
short of that, take it to your local machine shop and have them do it for you.
hope this helps---
--Russ
11-29-2007, 02:36 AM
#71
Rennlist Member
just put new rings on the pistons and put it together .
this tool has no resemblence to the felt pads and process the 928 block requires.
again, post some pics. your bores are more than likely fine.
Mk
this tool has no resemblence to the felt pads and process the 928 block requires.
again, post some pics. your bores are more than likely fine.
Mk
I have provided an attachment for you guys to review. I am not considering using this particular FlexHone tool as I don't think it was intended for our cylinders, but this is the general idea. I was curious if anyone has done this with a simple felt cloth and the AN-30 Silicon solution recommended for our blocks.
http://www.youtube.com/watch?v=u9mZClv5Nfo
Again, I am not going to attempt this, but was just curious more than anything. Although I admit to not knowing as much about these engines as many of my fellow Rennlisters, it is difficult for me to imagine that it would do much harm to use this process at home; provided you exercise care and consistency in the duration, speed and action of the drill on each cylinder.
Thanks for the info regarding the Chevy Vega blocks. I had heard that they were comprised of a similar material as our blocks. I believe the machine to use is Sunnen bore/honing with the proper bit(s) if my research is correct.
http://www.youtube.com/watch?v=u9mZClv5Nfo
Again, I am not going to attempt this, but was just curious more than anything. Although I admit to not knowing as much about these engines as many of my fellow Rennlisters, it is difficult for me to imagine that it would do much harm to use this process at home; provided you exercise care and consistency in the duration, speed and action of the drill on each cylinder.
Thanks for the info regarding the Chevy Vega blocks. I had heard that they were comprised of a similar material as our blocks. I believe the machine to use is Sunnen bore/honing with the proper bit(s) if my research is correct.
