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Old 09-03-2012, 07:40 PM
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pcv choice???

my 468 bbc has no place for pcv. 454-o victor intake 750 dominator. normally i wouldnt bother but i build so much crankcase pressure that my motor leaks from front and rear of the oil pan. how can i take some of that pressure out??

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Old 09-03-2012, 09:14 PM
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its not blowing the seals on the intake. i have a large breather on the driver side valve cover and a rubber elbow on the passenger valve cover with a hose going to the one inch space adapter. it doesnt leak with this set up but it creates a lot of vaccum on the carb. i feel like this set up adds initial timing. my idle can be erratic.
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Old 09-03-2012, 11:19 PM
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yes, i have no pcv valve.my idle is effected. i need to add a pcv to remove pressure from crank case otherwise i leak oil from oil pan. consequently by adding a pcv to a intake/carb that doesnt come equipped with a pcv port from factory my engine idle is effected. it idles nice and smooth when pcv is plugged. but when connected it goes high and takes a bit to come back down. i.e. a slight rev from the pedal may bring idle from 950 to 1200 rpm and take several seconds to come back to 950 or it goes lower to almost shut off.


so i would like to NOT run a pcv by way of intake/carb. any other method would be better.

i do need something to evacuate crank case pressure so im not leaking oil.

i doubt my rings are damage. i get no smoke and i still pull low 10s.
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Old 09-03-2012, 11:24 PM
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i do think maybe i need more timing???. im at 13 initial. before i had close to 20 but i had starter issues. car fires great now at 13. but my idle has always been werid no matter what timing.i cant member the cam size. i got so many cam cards i couldnt pick wich one i used in the motor. i feel like adding this method of pcv is effecting my idle and air/fuel mixture.
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Old 09-03-2012, 11:43 PM
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it makes a lot of sense what your saying. i think i have too much flow going through my pcv system. im going to add a pcv valve(any suggestion as to which kind to use) and a smaller diameter hose(currently using a 3/8 hose!!) ill let you know how it drives tomorrow.
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Old 09-04-2012, 10:26 AM
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Yeah I def run more timing at the track. Starter is no issue there cuz its a few quick run then shut Off for cool down. When I go to shows or date night I don't want starter issue so I retard the timing. I put a valve today wih a smaller diameter hose but I still leak. Maybe a better pcv valve???
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Old 09-04-2012, 11:23 AM
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It's crank pressure common on 11:1 comp and tall dome piston
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Old 09-04-2012, 11:12 PM
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so it def runs better in the city with initial @ 20 with no starter issues. at the track its around 25 with 38 total. idles better with more air/fuel mixture. your right bout the blow by air diluting the air/fuel mixture going in the intake so adding a little more fuel helps. crazy thing is i dont see a lot of blow by at idle coming out the valve cover not do i feel pressure which would be compression passing the rings and coming out the opening of the valve cover. but it sure build up at high rpms. id rather have it come out some other method than reburning it and diluting my mixture in chamber.
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