Engine Problems
- Thread starter Quadrider10
- Start date
That noise to me sounds like the rod slapin the case! I'd leak test it before i disassembled it then I'd disassemble it before I kick that over if it is a chunk you may put a hole in the case by trying to rotate the crank! Maybe others will disagree but a new gasket beats a aluminum repair anyday!
right on slicker!!! why oh why are you Not taking that cylinder off? id do exactly what slicker says, leak test then , take it APART!!!
Klotz benol
how is it the rod hitting the case???
i did
ok so i took the jud, head off, and heres what i found.
the piston and jug are perfect! theres no scratches or anything!
but the riings werent in the rite place. the one ring's gap was on the rite side of the piston. almost by the exhaust. and o forgot where te other was. what i did notice also was where the rings do seat on the piston, there should be a little bridge rite? like so thtat the gap in the rings is inbetween that bridgle so they dont move? if there is sopose to be a bridge, its not there. only a little stump.
also the rigs were very loose inside the clyinder. they moved around a lot.
also i check the connecting rod, and there was no up and down movement, and very very little side to side. but the piston on the other hand, that moved side to side A LOT! and it also had a tiny up and down movement. eres the pics and video.
View My Video
View My Video
btw i did leak test it, and it came up perfect!
the piston and jug are perfect! theres no scratches or anything!
but the riings werent in the rite place. the one ring's gap was on the rite side of the piston. almost by the exhaust. and o forgot where te other was. what i did notice also was where the rings do seat on the piston, there should be a little bridge rite? like so thtat the gap in the rings is inbetween that bridgle so they dont move? if there is sopose to be a bridge, its not there. only a little stump.
also the rigs were very loose inside the clyinder. they moved around a lot.
also i check the connecting rod, and there was no up and down movement, and very very little side to side. but the piston on the other hand, that moved side to side A LOT! and it also had a tiny up and down movement. eres the pics and video.
View My Video
View My Video
btw i did leak test it, and it came up perfect!
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i see hardly any blow by. the pistons alittle wet but you said you run your mix heavy. can you measure your bore and piston with a caliper??? hows the rod? any REAL side to side play???
no i dont have claiper, the rod does not have any up and down play, or any real side to side play. but the piston has A LOT of side to side, and those "bridges where the rings should seat are little nubs, and looks like they arent doing their job and allowing the rings to spin on the piston. and blow by? whats that?
There are two "half pins" that sit in the ring grooves in this picture:
http://i49.tinypic.com/2prib7b.jpg
The small "indents" on the ring ends should slide around those small pins and that *should* keep them from turning inside the bore.
In the very first video it sounds an awful lot like piston slap. That's the piston changing "directions" at the top and being able to actually run "cockeyed" in the more. Having a piston that's far too undersized for the bore could be the cause of all of your problems, actually, As mjgnslger said, measure the piston to cylinder clearance with a caliper and inside bore gauge.
http://i49.tinypic.com/2prib7b.jpg
The small "indents" on the ring ends should slide around those small pins and that *should* keep them from turning inside the bore.
In the very first video it sounds an awful lot like piston slap. That's the piston changing "directions" at the top and being able to actually run "cockeyed" in the more. Having a piston that's far too undersized for the bore could be the cause of all of your problems, actually, As mjgnslger said, measure the piston to cylinder clearance with a caliper and inside bore gauge.
i dident put the piston or anything in. the previous owner did. i tried to tunr it backwards befor i too it appart, and it dident make that noise as bad. but now my question is.... How could the piston be slamming agenst the cylinder walls if both the piston and cylinder are in really good condition? and my other question is, since the rings did spin, the the half pins arent doing theur job. so is it possible that they broke or somehting?
Easy.... Perfect condition 66mm piston inside a perfect condition 66.25mm bore! Judging by the buildup of carbon on the head but lack of blowby and carbon on the piston, that piston is new. The previous owner probably ordered the wrong sized piston (for a lack of knowledge) and slapped it together.
ohhh. yea the previous owner said it was .30 over, and theres a lot of carbon build up, caus i run it pretty rich for racing. i just asked him if he replaced the piston and rings with the correct size. but what about the rings spinning?
ok so the previous owner of the prvious owner did all the work. so my previous owner dosent know.
right on civic, Maybe the guy had the cylinder honed and it took enough material off the sleeve where it Should have been re sized. and just put a stock size piston in it.
you should try to get a caliper from a buddy or something to check the sizing... only way to be sure.
you should try to get a caliper from a buddy or something to check the sizing... only way to be sure.
Too small a piston in too small a bore can let the rings out of their grooves out and around the alignment pin. The other other thing I've ever seen cause that is the port job being too extreme and the exhaust port allowing the rings into it enough that they can slam the alignment pin enough to pop past.
It's generally quite rare to find a ring spun without any damage. Generally when the spin they snag a port and the engine "eats itself".
id mic that cylinder before you do anything. if it comes in at 66.25 then its just a piston and a hone.
alright well it cant be any of those, cause i dont have a port job yet. but when i took the pipe off, and moved the piston up and down, i saww the bottom ring expand into the exhause port, and as it moved back up, it contracted again. and that was just with the exhaust off, and i dident touch anything else.
A small amount of flex into the exhaust port is normal... that's why the blaster's exhaust port is shaped the way it is. Ovals return the rings into the grooves easier than sharp edges.
ahhh. ok. now what about the piston moving side to side on the rod and bearing? is tha normal?
