Thread: Decking questions for Pat

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Rodeck 350+ block decked .032, brodex track 1 heads, heads are new but surfaced. B&m powercharger 250 blower. Crane blower cam with JE pistons and plasma moly rings, copper head gaskets with aeroquip O rings, the block also has been 'O" Ringed around the cylinder bores. Felpro intake gaskets. Now the problem, engine smokes slightly at idle and more on decelleration. Removed PCV Valve to assure blower not sucking oil through it. Where is this oil coming from? Is it possible, from mismatch of the heads to intake from the block being decked .032? When do you start machining the intake? I'm at my wits end with this motor. Also I've heard the plasma moly rings never really seal as they are racing equipment. But, that is what Rodeck recommended. I haven't retorqued the heads as if yet. Just fired it today, but had this same problem before I tore it apart to address this very issue. Also, have some oil leaking out between head gaskets, ??? Guess I didn't get it.

Keith

i have to think some about this but if you .032 off the deck the intake could be sucking or any rocker mounting points not sealed going in to the intake port. as for the rings i have used many plasma molly rings they seal up .what do you have for valve seals . sure the rings are facing the right way was the block honed with deck plates ? were do you have the pcv valve hook in to ? what are you using for breathers ? i would never use a PVC on a blower engine or any thing much over mild build

Valve seals are viton and brand new set up buy engine shop. Rings are installed correctly as I read the directions 100 times over. The block was honed with deck plates and squared to crank CL. I am going to omit the PCV valve altogether. Before I tore it down it was going through oil like mad. Thought we fixed that prob. The blower was completely soaked and had standing oil in the intake runners. As block came out of a sprint car one of the screens was plugged with epoxy not letting the one bank drain back. Thought it was allowing the PCV to suck the oil out.

Rocker stud bores do not go all the way through into the intakes if I remember right.

Keith

PVC could suck oil and put in threw the blower and burn all the junk you do not want that better to blow it out then re burn that junk . sounds like your breather setup needs to be better

alot of the alum blocks do not have good drain back as they are mostly dry sump set ups . if you have screens and vent tubes it may need more drain back but still would get out of the heads it would lay in the valley but it need s to vent so added oil = bad deal with blower engine you just can not over vent them i use two breather per cover dry as a bone and work fine

I removed all the screens and had the valley drilled the way most SBC are set up. I guess I will have to invest in more breathers. What is your suggestion for cleaning the oil out? Can't think of any way short of tearing it apart. Just see if it will clear up by itself? I am going to delete the PCV!

Keith

pull the blower off wash out intake with rags and some mineral spirits let dry out abit. take spark plugs out crank it get the stuff out un arm the coil first. on bbc i like the moon breather one of the bigger ones they sell one per side should do the job were a smaller push in may not

Well, pulled the blower and sure enough, soaked. cleaned everything up and deleted the PCV. Will pick up another breather at the Hot Rod show this next weekend. I am going to try 2 push in Billet Specialties ones since I already have one. If it is not enough I will step up to some different valve covers and breathers. I would thing the push in ones should be able to flow enough. What are your thoughts on the breathers?

Keith

i think them breather have small cell foam in them not very good if so they get loaded with oil then they are done for .may need a baffle under them try it with just one on each cover and see what happens or the big K&N s i am abit over kill on breathers

I gotcha. Do you vent your breathers into the exhaust or just the air on a street motor?

Keith

Originally Posted by blwn31

I gotcha. Do you vent your breathers into the exhaust or just the air on a street motor?

Keith

no that set up only works good with out exhaust back pressure keeps it from working right . better to just use open breathers or you will end up back were you were with the oil deal

Alright Pat, thanks. Gonna fire it again today and hopefully no smoke.

Keith

Well, I'm about ready to throw this GeeWhiz motor over a cliff. I fixed the drain back issue on the first rebuild at 500 miles. Haven't even driven it yet and already had blower off and cleaned out a bunch of oil. Deleted the PCV. Refired this morning, motor ran about 15 minutes and I'm starting to see the blue haze. I rap on it and I'm killing all the Mosquitos in Placerville. If you've had this problem where did you look? Must be coming from intake mating surface gaskets. They looked good the last time I tore it down. I didnt see any evidence of oil leakage/travel path. Something to mull over, I smoothed (only smoothed) intake and exhaust runners. I had one head standing upright in the garage and I noticed a bright spot in the runner. Sure enough a pin hole from one of the bolt holes to the runner. I contacted Brodix, they had me ship them back to them and they sleeved 2 bolt holes through the runner. One in each head. I wonder if this could be a leak point?

Keith

intake runner in head still may have a weak spot .i line head bolt holes all the time they may have miss one but hard to get oil in that way have to come down from head bolt . push rod holes in the head s are weak they will suck oil. if intake is sealed down it can be rings or heads less your intake has a hole in it .that intake has the bolt holes for middel bolts and center bolts in the intake is that open to plenum? you have them bolts in the intake other then cutting threw the heads if big valve springs were put in that will make it smoke. oil ring spacers rails ? was the piston pins in the oil ring land if so did you put oil rail spacers in if so did you put them in right