Im currently in the middle of a build. Im running a H23a 89mm bore filled with Endyns rollerwave pistons that are out of the hole by lets say .015-.020(I don't know for sure cause I don't have a bridge. Im bolting an h22a head on top that still obtains the 87mm combustion chamber. Now, my question is this. How many people with with this same setup(boosted) have not touched their combustion chambers? I know that I need to match it with the bore, but I've already built my bottom end so Im to lazy to tear it back down just to scribe a line. Any ideas on getting it without using my scribe. I was thinking maybe take my head, bolt it on, and shoot some dykem down inside. then clean up with lacker thinner.

 

I think the better idea would be to run a head gasket that is at least .020" thicker than stock so that the pistons do not stick out of the hole. You will probably have too high a compression ratio as it is now.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl &raquo;</TD></TR><TR><TD CLASS="quote">I think the better idea would be to run a head gasket that is at least .020" thicker than stock so that the pistons do not stick out of the hole. You will probably have too high a compression ratio as it is now.</TD></TR></TABLE>True


My real question was if people are not haveing their chambers matched. If this were a N/A motor I could see not matching the chamber with the block. But seeing how this is a boosted motor air flow is a major factor here... and im wondering if people are still making good hp and not doing it?


Modified by ludesleep at 1:38 AM 7/22/2006


Modified by ludesleep at 8:22 PM 7/22/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludesleep &raquo;</TD></TR><TR><TD CLASS="quote">True


My real question was if people are not haveing their chambers matched. If this were a N/A motor I could see not matching the chamber with the block. But seing how this is a boosted motor air flow in a major factor here... and im wondering if people are still making good hp and not doing it?</TD></TR></TABLE>let me start by saying good job on choosing the endyne slugs.

If you were using any other piston besides theirs i would be scared of issues in a situation like this, but in the case of the roller waves the piston is treaded as the floor of the combustion chambe, and is machined accordingly, i bet if you look at the piston dome the machined area (dish) doesn't actually take up the whole piston surface, from what i have seen they only dish the pistons in the shape of the combustion chamber so that the quench pads are still affective, so the actual combustion happens inside the chamber where it should, not in the chamber anf circular dish area of the piston. machining the pistons in this way keeps the flame under control and give your engine a higher tolerance to detonation.

if i were you i would call endyne up on monday morning and just ask them, they have always been beyond helpful with any questions i have had, and in most cases they don't mind telling you what path to take even if it means using a product besides their own

 

up for the weekenders...whose hot and whose not!

 

Well I called Endyn today and they told me pretty much what I was already expecting. Yes they do recommend that you match you combustion chamber to your bore.I am impressed to see so many people with high hp numbers without doing it.