Im trying to measure ring gap and my P73 pistons dont make the ring seat true on the bore when pushing it down giving a false reading on ring end gap.

How do you go around to do this??

TIA

 

the dome is not that big..you should be fine when stuffing it in the cylinder to square up the ring for measurment...if its alittle off after you pull out the piston align the ends carefully together by hand..this is what i do and works perfect..everyone has their own way though...

 

All dome pistons I have seen will have a flat ridge on the top of the dome. IT is not like the dome is an actual tent where two slopes meet at one point. It is more like two slopes meet with a small gap between that is connected. Like this





(Shameless plug for my 7.7CC 86mm CP's!) To much bling for me. Not used to it. lol

 

push the ring down about an inch into the cylinder. I think this should be sufficient for most pistons.
once its "squared" in the bore, use your feeler guage to check the gap.

 

im getting .020" which is too muchbut I SEE that the ends are not perfectly matched. By hand seems very innacurate

 

I just use a carpenters square.Set it at one inch.Put the ring in the bore,and work the square around the bore while bringing the ring up against it. http://www.sears.com/sr/javasr...uares
Glenn

 

I use a dial caliper and do the same thing.

 

Use a LS, GSR, 4AG, piston or a Fosters can. There must be a flat round object close to the correct size of the bore somewhere, where you are located. And .020 is too large.

 

Heineken Keg Can is real close to your bore size. :-)

 

I measured with a calipers depth gauge. most came to be .016 and .014 which seems ok as per hastigs recomendations

 

.014-.016 is OK I like them alittle tighter with a 600 finish for NA. Now I have to try Heinekins.

 

I had the bore finished with 380 because these are chrome rings. Dont really know what oem material is but hastings recomends 380

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF &raquo;</TD></TR><TR><TD CLASS="quote">.014-.016 is OK I like them alittle tighter with a 600 finish for NA. Now I have to try Heinekins.</TD></TR></TABLE>

As if either of us needed another excuse for Heineken right. :-)