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WOT and no PCV question #386530 07/25/09 11:20 PM 07/25/09 11:20 PM
Joined: Nov 2004 Posts: 8,094 Sunnyvale, CA Jeepmon OP master
Jeepmon OP master Joined: Nov 2004 Posts: 8,094 Sunnyvale, CA	I sprung an oil leak out the back of the intake manifold where we had RTV... The oil would come out at high rpm and while under load.. Today we made the repairs, however one question came up that I didnt know the answer to... We lost the rubber grommet that holds the PCV in the valve covers and we ran one day at the track without any source of vacuum.. Can the pressure build up inside the block enough to blow out the RTV or do you think it was just a bad RTV job on the original install? (BTW, the intake was installed about 2 years ago and the leak just happened the last time at the track) 73 Duster 360 stroker http://www.cardomain.com/ride/2594657

Re: WOT and no PCV question [Re: Jeepmon] #386531 07/25/09 11:23 PM 07/25/09 11:23 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	Yes you need to remove blow bye and at WOT there is enough to pressurize the engine. should have a PVC and a breather on the other valve cover.

Re: WOT and no PCV question [Re: Jeepmon] #386532 07/25/09 11:38 PM 07/25/09 11:38 PM
Joined: Aug 2003 Posts: 43,284 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,284 Bend,OR USA	I use two PVC valves and two breathers, one of each in both valve covers. My stroke(4.300) is a little longer than yours so you may not need both PVC valves, I used a T off of the PVC port on the carb so there is one hose to each PVC valve The motor idles better now also Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: WOT and no PCV question [Re: Dodgem] #386533 07/26/09 12:02 AM 07/26/09 12:02 AM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer master
Bob_Coomer master Joined: Nov 2003 Posts: 6,293 Rock Springs	Quote: Yes you need to remove blow bye and at WOT there is enough to pressurize the engine. should have a PVC and a breather on the other valve cover. Only problem with PVC is there is no vacuum at WOT. You need a breather...If the blowing oil every were still, like out the dip sick tube, and just cant keep it sealed..It would be a ring problem no doubt. [color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

Re: WOT and no PCV question [Re: Bob_Coomer] #386534 07/26/09 12:41 AM 07/26/09 12:41 AM
Joined: Jan 2003 Posts: 5,486 SoCal Brian Hafliger master
Brian Hafliger master Joined: Jan 2003 Posts: 5,486 SoCal	I use 4 breathers on my engine... 5376053-engineincar001.jpg (65 downloads)

Re: WOT and no PCV question [Re: Brian Hafliger] #386535 07/26/09 01:16 AM 07/26/09 01:16 AM
Joined: Nov 2004 Posts: 8,094 Sunnyvale, CA Jeepmon OP master
Jeepmon OP master Joined: Nov 2004 Posts: 8,094 Sunnyvale, CA	There is a breather on one of the valve covers and PCV on the other.. When the PCV fell off, it basically had breathers on both sides and no vacuum source.. I guess the answer I was looking for is what could cause the RTV to blow out the back of the intake..?? 73 Duster 360 stroker http://www.cardomain.com/ride/2594657

Re: WOT and no PCV question [Re: Jeepmon] #386536 07/26/09 01:33 AM 07/26/09 01:33 AM
Joined: Jan 2003 Posts: 19,382 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,382 Las Vegas	Well pressure in the crankcase can certainly cause RTV to get blown out from under the intake. Or it could simply be that the RTV did not properly adhere the first time it was put on. "I am not ashamed to confess I am ignorant of what I do not know." "It's never wrong to do the right thing"

Re: WOT and no PCV question [Re: Al_Alguire] #386537 07/26/09 03:59 AM 07/26/09 03:59 AM
Joined: Jul 2004 Posts: 4,384 Worst Weather USA 493_DART master
493_DART master Joined: Jul 2004 Posts: 4,384 Worst Weather USA	I ran 1 race a couple weeks ago and couldnt use any "vents" my valley pan bulged up into my manifold and had some lovely oil leaks on the edge of the manifold . im getting used to oil leaks though.....

Re: WOT and no PCV question [Re: 493_DART] #386538 07/26/09 10:13 AM 07/26/09 10:13 AM
Joined: Jan 2003 Posts: 21,083 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,083 Niles , Ohio	We run 2 Bbs and a SB with just breathers.None have problems.They are street driven and raced.My kid 62 still has the OE motor and gets driven more than most cars here.I run 12.5 domes and it sees 7K all the time.No leaks and no problems.The SB is built also.Rocky Chrysler Firepower

Re: WOT and no PCV question [Re: Jeepmon] #386539 07/26/09 10:28 AM 07/26/09 10:28 AM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440
blownzoom440 B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH	when i have leakes from a sealed serface it was useualy reving it too high or too much timing or fuel.

Re: WOT and no PCV question [Re: blownzoom440] #386540 07/26/09 02:06 PM 07/26/09 02:06 PM
Joined: Nov 2004 Posts: 8,094 Sunnyvale, CA Jeepmon OP master
Jeepmon OP master Joined: Nov 2004 Posts: 8,094 Sunnyvale, CA	Thank you all for the responses.. 73 Duster 360 stroker http://www.cardomain.com/ride/2594657

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