ToomeySheeLE Posted July 5, 2008 Report Share Posted July 5, 2008 I'm just wondering if someone can tell me why I'm getting this much blow by.. Topend has less than a season on it and the rings and cylinder walls look as good as new.. I'll attempt to post pics.. Quote Link to comment Share on other sites More sharing options...
mopar1rules Posted July 5, 2008 Report Share Posted July 5, 2008 ....improper breakin. ....shitty oil used. Quote Link to comment Share on other sites More sharing options...
KaosBanshee44 Posted July 5, 2008 Report Share Posted July 5, 2008 Are you letting it warm up before you go WOT Quote Link to comment Share on other sites More sharing options...
ToomeySheeLE Posted July 5, 2008 Author Report Share Posted July 5, 2008 Broke it Correctly... 3 heat cycles then took it easy for a tank.. Always let it warm up good before hammering on it.. Quote Link to comment Share on other sites More sharing options...
C&B Posted July 5, 2008 Report Share Posted July 5, 2008 Is the bore true? Quote Link to comment Share on other sites More sharing options...
bansheefreak Posted July 6, 2008 Report Share Posted July 6, 2008 i bet the compression was low... Quote Link to comment Share on other sites More sharing options...
LS1Inferno Posted July 6, 2008 Report Share Posted July 6, 2008 bore wasnt sized for the pistons. they just look like they are prlly the next size down is it all the wasy around the piston evenly? Quote Link to comment Share on other sites More sharing options...
mopar1rules Posted July 6, 2008 Report Share Posted July 6, 2008 was this engine rebuilt recently, or does it have lots of run time on it? if you just rebuilt it, how good was the bore? was it a out of round? was it honed? if so, with a shitty ball hone? what oil do you run? i use amsoil dominator. you said you heat cycled it 3 times. i wouldn't worry about heat cyclying it. with mine, i just let it idle and warm up good and then just giver hell down the road. did that right after the fresh rebuild and never had a bit of blow by on mine. tore the top end down to confirm this. only reason i tore the top end down, was to clean up the ports a little. engine was still fine. you don't want to be dicking around during breakin. you want to get the rings seated, b4 the crosshatch is worn off and the cylinder walls are glazed. another reason i asked if your cylinders were honed, is cause if they weren't and they were glazed, the new rings wouldn't of seated correctly, giving you the blow by that you are experiencing now. Quote Link to comment Share on other sites More sharing options...
ToomeySheeLE Posted July 6, 2008 Author Report Share Posted July 6, 2008 was this engine rebuilt recently, or does it have lots of run time on it? if you just rebuilt it, how good was the bore? was it a out of round? was it honed? if so, with a shitty ball hone? what oil do you run? i use amsoil dominator. you said you heat cycled it 3 times. i wouldn't worry about heat cyclying it. with mine, i just let it idle and warm up good and then just giver hell down the road. did that right after the fresh rebuild and never had a bit of blow by on mine. tore the top end down to confirm this. only reason i tore the top end down, was to clean up the ports a little. engine was still fine. you don't want to be dicking around during breakin. you want to get the rings seated, b4 the crosshatch is worn off and the cylinder walls are glazed. another reason i asked if your cylinders were honed, is cause if they weren't and they were glazed, the new rings wouldn't of seated correctly, giving you the blow by that you are experiencing now. Assuming they weren't honed(Im honestly not 100% sure) would I be able to hone them now and put a new set of rings in and have them seat correctly? I'm running blue marble 32:1, been using this oil for a few years on another motor and never had this before.. Quote Link to comment Share on other sites More sharing options...
ToomeySheeLE Posted July 6, 2008 Author Report Share Posted July 6, 2008 Assuming they weren't honed(Im honestly not 100% sure) would I be able to hone them now and put a new set of rings in and have them seat correctly?I'm running blue marble 32:1, been using this oil for a few years on another motor and never had this before.. My ports weren't lined up and the blowby is the oil thats been running into the ring area of the piston. Corrective action has been taken. Thanks for all the input Quote Link to comment Share on other sites More sharing options...
mopar1rules Posted July 7, 2008 Report Share Posted July 7, 2008 Assuming they weren't honed(Im honestly not 100% sure) would I be able to hone them now and put a new set of rings in and have them seat correctly?I'm running blue marble 32:1, been using this oil for a few years on another motor and never had this before.. you can hone them and throw in a new set of rings, if there isn't any deep scoring going on. also, keep an eye on the bore diameter tolerances. if the bore gets too big or out of tolerance by like .001"-.003", the ring end gap will be greater and there will be more compression lost through the larger ring end gap. not to mention too much piston to cylinder clearance. can you say "broken piston skirt"? if you just run a common kd tools engine hone through it for 20 sec, you won't be opening up the bore much. try to get the crosshatch marks at like 45-60 deg angles. my uncle who worked for bombardier for 17 years, told me they tested blue marble oil and it was horrible. he would not recommend it to be used in anything. if i were you, i would run some amsoil dominator, as i have had great luck running it in all my toys. Quote Link to comment Share on other sites More sharing options...
letsgetthisdone Posted July 7, 2008 Report Share Posted July 7, 2008 if you took it easy for a tank, the rings didn't seat right. let it idle for a few minutes to make sure it doesn't kill itself. search motoman breakin on google, break it in just like how it says.. Quote Link to comment Share on other sites More sharing options...
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