Wondering if anyone has done this on their motor? I have scratch on my cylinder wall, that's probably more than one thousand of an inch deep, and if I can't hone it out to retain the proper piston to cylinder wall specs, can I bore it and run just one oversized (.25 over) piston with the other 3 pistons? I'm trying to avoid having to buy all new pistons if this is the outcome. What are some of the negatives I could encounter, or would you even recommend doing this? thanks.

 

goodnight bump....anyone??

 

i have never ever heard of this before, lemme see what other people have to say.

to me i think its a dumb idea

 

As long as the weights are close there is really no problem doing this.The slight increase in displacement won't effect the running of the engine.Each cylinder doesn't make an exactly equal amount of power.An example that comes to mind is a big block chevy.This engine has four intake ports that flow much better than the other four.That makes a much bigger difference in per cylinder power than a minor displacement difference will make.
Glenn

 

thanks for the info, not really what I wanted to do but we'll see what happens, I'll call JE and see exactly what the piston weight difference is from stepping up to .25 os.

 

using one oversized piston will create an inbalance in the reciprocating mass. thus resulting in premature engine wear. just to save money. well some peeps may think is ok, but here's a link explaining how a mere 7 grams creates 112 lbs. of external force on the crankshaft. if you do it let us know what happens.

http://www.moparsunlimited.com....html

 

It's possible to balance an oversize piston to match the weight of a standard piston, but it's really not worth it. For the money it would cost to take all of the pistons to someone and have them balanced, you could have just bought all of the oversize pistons, and been done with it. The entire bottom end will have to be disassembled for this to work anyway, and that means all 4 cylinders will have to be honed anyway.

Suck it up, spend the money and do it the right way.

 

Just because the piston is .010" oversize dose not mean its heavier.I've had to do this before to save blocks that would not be rules legal because of cubic inch if I bored the whole block oversize.When I call the manufacturer for the piston I specify the weight.Its not that uncommon in race engines.
Glenn

 

you can buy just one piston? Hell that is news to me alone. <TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Qfactor &raquo;</TD></TR><TR><TD CLASS="quote">using one oversized piston will create an inbalance in the reciprocating mass. thus resulting in premature engine wear. just to save money. well some peeps may think is ok, but here's a link explaining how a mere 7 grams creates 112 lbs. of external force on the crankshaft. if you do it let us know what happens.

http://www.moparsunlimited.com....html</TD></TR></TABLE>

it is not worth the hassel spend the money on all 4 and do it right the 1st time so you wont have to do it a 2nd, 3rd, 4th etc etc

 

Retailers don't stock singles and it doesn't make sense for retailers to break a set.Honda sells pistons as single as well as aftermarket manufactures.There are many opinions on what "right" is.Is this my first choice?No,but I would do this under the right circumstances without hesitation.
Glenn

 

Thanks for the feedback... I'm just going to buy a set of 4 os pistons and call it a day, almost all of the aftermarket pistons have a considerable increase in weight when stepping up to the next size