Hi all

Got a question about reusing some 103 oem cylinders. In the honing process, roughly how much of the cylinder bore is removed? I thought it'd be a fraction of a bee's dick but would this still create a greater piston-bore clearance for the oem 103 cast piston? Is this the reason that there are slightly oversized 103 pistons on the market.  Thanks

The rings will take it up.   Make sure you check the ring gaps with the rings in the cylinder and to the top of the cylinder.

what ando has said is what machine shops do  depending on pistion and applacation , torque plate hone is the better way to go better ring seal
as the cylinder is torqued down when honed so the bore is not distorted as much but in saying that
if you don't give the new bores a super clean when assembling the torque hone wont help you much
and its not the end of the world if not torque plate honed

Hi,

 If there no significant marks ect in cylinders just install

There great reading in the manual about cylinder honing and sizing

Thanks
Robots

Fatbat, In an ideal world, you would use new oversize pistons/rings and have the cylinders re-sized to suit.

In your situation, if you want to re-use the 2nd hand (or new) pistons with new rings, you really should have the cylinders lightly honed, unless you want to risk the new rings not seating correctly. Before honing, the cylinders need to be checked for out of round/taper etc' , and check the bore size to see if they will accept a light hone without the piston clearance being to loose.

The other choice, if you have the original low km's mated cylinder/piston set (with the old rings) , and they look like they had good ring seal, you could re-use them after a good clean.

Either way, you should get someone you trust to inpsect/measure them for you.

you need to have your original bores checked with bore mike properley , most people dont have these, maybe bash full has

torque plates are  used for boreing and  honeing to finnish sizes  , boreing is one thing and honeing is another ,honeing  iis  how you true up bores with boreing problems to get correct sizes and finnishs, , unless you have the the machines and or most importaly the correct  measureing gear to see what i see and or know how to use them ,  torqueplates  were not used for years on hd engines , it started from car eng builds tensioning head studs down , they distort top of block being pulled upwards so  bores distorted upwards when tensioned , harley cyclinders are tensioned to a  compressed state   to 38-42 lb , honeing  starts out at to 5-7  thou under size and then 400 gritt -200 etc honed to finnish to correct clearances and finnish,,,,,  ps larry perkins sent brockeys eng blocks sent back to england to have them hot  temp  honed at correct opperating temp and clearances of pistons  for endurance raceing to last , and they did . this is 1 minute aspect of a eng build to get correct , chhers guys

bores are about correct clearanes for pistons to bore , do you have correct measureing gear to check with ,??????, things do need to correct men ,

(what does 1'' down the bore mean ??? ), bore diametre to piston cleance is what needs to be correct measurent  and needs to be checked  , and then in a bore on the  thrust side were most wear happens needs to checked with quality bore mic as speedzter pointed out , with bore ,wear such as  tapper etc ,  is good start point , dont leave things to to chance or it will bite you on the ass , cheers

the secret is measure twice, cut once , bore micrometre for internals  , external micrometre for measureing pistons , these  items , good quality cost about $ 800 for the pair so you can check it properly  , then you can make  proper call on what is really needed ,if not good option ,  take them to a place who has the gear to check properly , cost would be minimal to have accurate info ,cheers  

Hi,
When you pull it apart you going to realise how simple basic stuff it all is, you will enjoy it fatbat,

Thanks
Robots

nothing basic about working with hundreds of a millmetre  or tenths of thous, robots you are the man

george , could you please stop annoying the big kids ,lol