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back pressure in sump of bmw horizontal motorcyle70's push rod system


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hgriffin
New User

Sep 21, 2013, 6:20 AM

Post #1 of 3 (1099 views)
back pressure in sump of bmw horizontal motorcyle70's push rod system Sign In

just overhauled the engine new valve guides valves honed bore and new rings excellent compression over 80lbs per square ins, but i am having quite an amount of back pressure in the sump and is using quite a bit of oil , oil is coming back into the air filter and is getting burnt through the carbs .
can some one help to solve problem how can i nulify the back pressure any help would be greatfull e mail address

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(This post was edited by Discretesignals on Sep 21, 2013, 6:46 AM)


Discretesignals
Ultimate Carjunky / Moderator
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Sep 21, 2013, 6:29 AM

Post #2 of 3 (1097 views)
Re: back pressure in sump of bmw horizontal motorcyle70's push rod system Sign In

80 lbs? That is low compression.





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nickwarner
Veteran / Moderator
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Sep 21, 2013, 11:29 AM

Post #3 of 3 (1069 views)
Re: back pressure in sump of bmw horizontal motorcyle70's push rod system Sign In

Definately too low. I'm guessing you needed to punch it out to the next overbore and replace the pistons and rings with the right size instead of give it a bottle brush hone.






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