Cylinder Honing Tool

[spikemoto]

I fried my piston rings and now my cylinders are glazed. The bores look fine, I am going to try honing them out and replacing the rings... which leads me to my question:

What is the best honing tool for our engines? I heard the ball-style honing tools are no good.

[SteveH]

I would check with your ring supplier. They often specify what grit should be used for honing for best results. I'd take it to the shop and let the pro's do it for you.

[Error404]

[macspring]

I would check with your ring supplier. They often specify what grit should be used for honing for best results. I'd take it to the shop and let the pro's do it for you.

I agree also, given the low cost of having the pros do it and the big implications of getting it wrong by diy.

[steve briance]

im currently <slowly> rebuilding an engine and will take mine to the machine shop to have the bores checked for roundness before being honed or whatever they end up needing. Just out of interest though - when you buy a new set of rings, does the box come with instruction on what grit surface finish the bores need to be? I've read different ring materials need different surfaces which makes sense but it would be nice to have the information up front from the people who make the rings so there are no mess ups in the future!

[pasbogdan]

http://www.enginehones.com/technical.html

If you get Kolbenschmidt rings you will have 2 options:
1.First type of rings needs 100% round bores so machnine shop should do it.Not any shop.The best one,and check the bores after they do it with an internal gauge.I got once a block from a respectable shop with 0.02mm TDC to BDC difference.So measure it when it is done.

2.Softer rings that will acomodate a bore that is not perfectly round or cylindrical but in factory spec.You can try to do it yourself.But it is cheap to do it at the shop,so why not do it perfectly.It is the patern also not only the grit and roundness.

If you look on the forum you will find info about kolbenschmidt ring types and materials.And the one will fit your app.I could search it for you but not now.Or look on ks(kolbenschmidt) ring spec,material used and look on the internet for application.Also ks should reccomend the grit.

[popdemonic]

I'm in the same boat.I'm going to rebuild my AAN very soon.Just one quick question AFAIK the stock AAN pistons are 80.98mm,Cylinders Bore are 81.01mm.What is the allowance cylinder bore size after honing to be using with stock
80.98mm AAN Pistons.If possible i dont want to pay another 1K USD for oversized pistons.

[quattro-nick]

in the past when i had rebuild some engines i always used the ball-style honing tools without problems afterwords.it's very important you dont use it dry,i made it wet with some wd40 spray! just my experience,i'm not a profesional in rebuilding

[diesel des]

I'm in the same boat.I'm going to rebuild my AAN very soon.Just one quick question AFAIK the stock AAN pistons are 80.98mm,Cylinders Bore are 81.01mm.What is the allowance cylinder bore size after honing to be using with stock
80.98mm AAN Pistons.If possible i dont want to pay another 1K USD for oversized pistons.

If going that level of trouble put larger pistons and rods in it. Fcp on here will do you a very good deal and you should get both and machine work done for 1k usd.

Sent from my LG-H955 using Tapatalk

[steve briance]

Pasbogdan - thanks for the input!

Its a standard spec 7A engine i'm building so don't need to consider the effect of increased boost as those with turbocharged ambition do

I'll research KS parts as they do seem to come with a good level of recommendation.

[popdemonic]

If going that level of trouble put larger pistons and rods in it. Fcp on here will do you a very good deal and you should get both and machine work done for 1k usd.

Sent from my LG-H955 using Tapatalk

Des,
I think i could find the good block without any pitts on the cylinder
Wall but not sure if when we get the block rebuilt,is it a MUST for larger
Pistons? I dont know how much the bore is still permissible size for stock
Pistons.the std size is 81.01mm

[Thuppu]

http://www.s2forum.com/forum/showthread.php?t=73985

[popdemonic]

http://www.s2forum.com/forum/showthread.php?t=73985

Cheers Mate!

[JP]

Depends on whether you are rehoning existing bores or reboring. Depends on whether using tapered molybdenum inlaid rings chromium plated rings or steel rings.

First need to check roundness of bore if attempting to remain stock. If within 0.005" out of round then you can use a nice 180 grit 4 leg honing tool for around 4 passes at medium pressure. Use tapered molydenum rings and of you go.

If out of round 0.001-0.002" again use 180grit 4 leg honing tool and bring back to round on medium to high pressure. Once roundness is achieved check piston clearance is still within manufacturers spec. Then Plateau hone it using a 220grit flexhone. After which you use chromium plated rings.

If worse than the above measurements you want min 20thou overbore. depending on manufacturer supplied rings (either chromium plated or steel) would determine final honing finish which can be anywhere from 220-400grit final plateau hone after initial sizing hone.

Also irrespective of which pistons/rings you go for depending on useage of the engine you would then alter the angles of the hone accordingly between 30 and 60 degrees.

Instructions like these do not come with piston ring kits all the time it comes down to the experience of the machine shop/engine builder to ensure the correct configuration is used.

[macspring]

Depends on whether you are rehoning existing bores or reboring. Depends on whether using tapered molybdenum inlaid rings chromium plated rings or steel rings.

First need to check roundness of bore if attempting to remain stock. If within 0.005" out of round then you can use a nice 180 grit 4 leg honing tool for around 4 passes at medium pressure. Use tapered molydenum rings and of you go.

If out of round 0.001-0.002" again use 180grit 4 leg honing tool and bring back to round on medium to high pressure. Once roundness is achieved check piston clearance is still within manufacturers spec. Then Plateau hone it using a 220grit flexhone. After which you use chromium plated rings.

If worse than the above measurements you want min 20thou overbore. depending on manufacturer supplied rings (either chromium plated or steel) would determine final honing finish which can be anywhere from 220-400grit final plateau hone after initial sizing hone.

Also irrespective of which pistons/rings you go for depending on useage of the engine you would then alter the angles of the hone accordingly between 30 and 60 degrees.

Instructions like these do not come with piston ring kits all the time it comes down to the experience of the machine shop/engine builder to ensure the correct configuration is used.

@op and others, now you know why certain jobs on our cars are best left to the professional with years of experience.

Just sayin..............

No connection to JP.