I have about 8 thou. taper on my 26 TT. What can I get away with and not have piston slap noise? Standard bore, good steel pistons. Allen Brintnall S.W. Mo.
Allan you could get away with that on a car that is just used for parades and not having more than 500 a year put on it. If it were me and I want to really drive it I would bore it to the next size
I suspect you have heavy cast iron Pistons. I classify any iron piston as bad. You have excessive clearance. The block needs to be bored and you need new aluminum Pistons.
Spencer: Thanks for your input. I realize it is marginal, but I know it will not get a lot of miles put on it, I just don't want to hear piston noise. 6-8 is pretty consistent with my dial gauge. Allen
I agree with Royce ........and also Spencer, provided your intent is very limited use.
I commented in a previous post regarding the general subject of cylinder taper from my machine shop experience.
Royce: You are right, cast iron. I just didn't want to bore it if I didn't need to. Allen
Gary; Thanks for the explanation about heat transfer and your input. Allen
You can scuff the cylinders lightly with a home or emery cloth and install new piston rings. It won't be perfect but it will work. You might want to do a dry and then a wet compression test before you do anything.
Thanks Ted, I deglazed the cylinders, new valves with oversize stems, new adjustable tappets, good crank, rear main cap to get end play right, I just have a little too much clearance for a perfect piston fit. I am concerned about the possibility of piston slap noise. I want it to work, it doesn't have to be perfect. Thanks. Allen
Since you've done a valve job and deglazed the cylinders, I suggest you replace the rings and run it. My guess is you'll be surprised how well it runs.
Not sure if anyone does this anymore but it is possible to knurl pistons to reduce clearance. I did it decades ago on an engine (not a T) I didn't want to spend any money on. Essentially after knurling, the piston will be too big for the bore which means you then have to hand fit them to the bores. It can also allow for straightening out the bores with a good rigid hone. Keep in mind most pistons are tapered and cam ground, meaning they are not actually cylindrical in shape. You will need to be good with a micrometer as you work the areas raised by knurling down to the proper clearance.
Thanks guys for your input. I enjoy following this forum. Allen Brintnall S.W. Mo.
I sent you a PM.