Honing Cylinders

[TSiWith17PSi]

Hi, I have a concern on how my pistons look. I have .20 Wiseco pistons and the coating on the sides of the pistons is worn off. This makes me think that my cylinders are a bit on the tight side since the engine only had +/- 1k miles on it. I plan on Spraying the cylinders down good with WD40 and honing them myself with a high speed drill. I can still see a cross hatch so that isn't a concern. What I was thinking is can I hone out the cylinders a little more then they are now to better suite the pistons? If so how far should I go with it? Any help would be appreciated

 

[TFFC]

Don't do it just yet. Get a dial bore gauge and measure the Cylinder. That will tell you if the cylinder is tapered or out of round. Take your measurements and compare them to the spec. If you have a problem then you might be able to just hand hone them, but depends on how far off they are. Also measure the piston and take your reading from the cylinder and subtract it from the piston measurement and check that spec. The coating is going to wear off with heat so thats not a problem.

 

[Burnett03]

The coating on the pistons is supposed to wear off.. What was your piston to wall clearance when the motor was built? This will tell you if you are on the tight side or not.

 

[awdtalontsi1992]

I would highly not recommend just honing the cylinders without measuring them. Find a buddy with a bore gauge and a micrometer and check the clearences. If they are tighter than Wiseco wants then hone them out alittle and check the bore size often.

The piston coating will wear off over time but 1000 miles sounds alittle quick.

 

[diambo4life]

It is common for the coating on the Wiseco piston to wear off that fast. Follow the advice that has been given and measure the piston to cylinder wall clearance. You need a cylinder dial bore gauge and an accurate micrometer that can measure to the 0.0001". Measure the piston's diameter at the bottom of the skirt or ~1.3" below the oil rings. Then zero out a dial bore gauge and measure the diameter of the cylinder bores; top (below the ridge,) middle and bottom. Both parallel and perpendicular to the crank. 6 measurements total per cylinder. Measure it (bore gauge readings) against the same mic. That should give you all the measurements you need to establish taper, OOR and PtoW clearance.

For honing you need to use either honing oil or 30W motor oil. I normally use 10-30W. You also want to use low speed on the drill and do not overdo it. A minute per cylinder is plenty. You just need to knock the glaze off if present and leave a fine uniform crosshatch pattern.

Hope that helps you.