wassup, i just picked up this block and was told it burned oil and now i know why. question though, what cuased this? too tight of bores? too loose? other?

 

Damn!!! I would like to know what happen also

 

Looks like it was too loose or maybe too tight, not sure but looks like crappy machining. Who was the machine shop that bored and honed the cylinders??

 

it looks like black death, that's the term they use when the clearance too tight, and it scraped the skirt wayy more than it has to.

It was either crappy machining, or the out of roundness of the bore is compromise due to detonation..

stan

 

Those pistons look fairly new. My guess is they were installed after just a quick honing, and the cylinders were out of round. Definitely too tight. If they were too loose, there would be damags all around the sleeve, not just in one place.

 

I believe if it the scratches start from top of the skirt its too tight, if they start from the bottom of the skirt its too loose. So these would be too tight.

 

yea my old block wasnt honed perfectly... so my piston skirts were all scratched up...

 

so too small and it scraped all the oil off the walls, causing too much friction and heat?


Modified by Sp00n'd Supra at 10:43 PM 1/24/2004

 

anymore input?

 

Which machine shop did u go to?? Was it a shop experienced with Honda's or did u just take it to the closest machine shop??

 

i didnt take it anywhere, i bought the block as is, i was told it burned oil and that it needed work. so i dont know who did the machine work or assembly

im just tryin to figure out if anything is wrong with the block so i can correct it before i rebore and hone to 84.5mm and slap in new pistons, and i dont wanna make the same mistake the previous person did

 

should of just bought my block

 

anyone else?

 

did u buy it from H-T... what was his sn?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboDANDEE &raquo;</TD></TR><TR><TD CLASS="quote">did u buy it from H-T... what was his sn?</TD></TR></TABLE>

yea fastek9, y?

 

what to do what to do...

 

ur rods are to tight on the crank, they cant swing as freely as needed, nxt time u put them in hone the block then hold the piston from the top, if the rod hits both sides freely ur straight

 

can you push the pin out of the rod and look at bushing it may off had a bad injector

 

You guys missed this one completely (well maybe not fabman)
That piston ran too lean and overheated (not the motor, just the piston).
If the galling started at the bottom of the skirt and worked upward, it would be a clearance issue.
But in this case, the piston was so hot on top, it lost all it's taper and actually became fatter on the top and caused it to scrape the cylinder. If you look at the middle ring, you would probably see that the ends had butted after losing their gap and scraped all the oil off of the cylinder wall.
Only fix is to bore it and get new pistons.