SoCal Jet Boats
Misc. => Suggestions / Support => Topic started by: Bigblockchevy on July 29, 2013, 09:12:39 PM
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Hi guys. I have just a little question to ask. I'm running a BBC with headers and also running a PCV. I change my oil about every 2 to 3 trips. I notice that my oil is a little milk shake looking. So my question is should I get rid of the PCV and run normal good breathers instead? Will that help stop some of the moister in the motor keep my oil a little less milky? I never had this problem ever with this engine until I added the headers. Motor runs very good and don't have any issues with that. If anyone can give me an idea of what to change or do it would be great. Thanks guys
Brian
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Here is a pic of my oil today. I did run the boat pretty good all weekend most of the time about 4,000 to 4,500 RPM's most of the weekend
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no pcv or breather is going to fix that. you have internal problems. headgaskets, etc.
if u had a little milk on the dipstick or in the top of the valve covers, ok... but thats just not good.
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You need to know a few things, how is it plumbed? What kind of pressures are you running? At what RPM do your headers mist?
You say you did not have this problem until you switched over to headers. Thinking something got missed...
That is a serious amount of water in the oil.
GT
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I'm running a everyday gate valve off the pump. I don't get water out the headers until about 1,500rmps like should nothing at ideal. My gate valve is wide open. Should I back the gate valve off a couple turns? I don't really know what the PSI is at unless I have someone drive the boat and I look because we're my gage is located. I was hoping you would be the one to write back on my question GT. how my boat it plumb is what you say and talk about. But I could be missing somthing or something not set right. I will up load a couple pics for you to look at on the plumbing. Thanks very much for the respond.
Brian
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I also have the restricters in the header lines
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The oil level does not rise up the stick. Yes I do get a little mist in the valve covers. That's why I was thinking the PCV might have something with it. But don't know so glad you guys are helping me thanks again
Brian
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I think it would be safe to say you could lose the PCV, but in all honesty, that is likely not the issue.
Any idea what size the outlet dump is, especially at the through hull fitting?
It looks like you have one of those relief valves... What is it set for?
Any clue how much HP your making?
What temps are you seeing?
Nothing really stands out with the exception of the valve being wfo.... That should not be.
GT
Sent from my SGH-T989 using SoCalJetBoats mobile app
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One more idea popped into my head. Are your headers drilled for drainage? And are you running mufflers?
I'm thinking you need to shut down the valve until the headers cone in at 1800 rpm.
Sent from my SGH-T989 using SoCalJetBoats mobile app
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The only thing I have is a gate valve no relief valve. The valve you might me seeing is my Header T for the header before the headers. I guessing HP is around 450 and up but no higher then 500. At ideal I'm at about 130 140 temp. Driving at 3000 to 4,500 and 5000 I'm at 100 if that. My dump is 1/2in and yes it reduces down at the end on transom. Might be on to something there. Also I will turn my gate valve down a little. I'm thinking I just have to much pressure but that's just a guess. The motor is fresh rebuilt and about 5 trips on it. No issue on performance at all motor rocks besides milky oil. Oil pressure is good and stays good the hole time. I'm going to check some things out and reset some things. Hope it get better. Thanks a bunch GT for your info. :-)
Brian
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No baffles and yes there is drain holes by the water lines
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exact example of the infamous Gate Valve.
If not set right WAY TOO much pressure coming through your gaskets Its not the PCV its the pressure from the pump forcing the water past your gaskets.
This is why I dont like the gate the gate isnt necessarily the issue but the lack of knowledge operating it. Now be carefull not to back it down too much and blue those headers. Gt does have a good procedure to set the gate up I forget what it is but I'm sure he will let you know.
Youll get it right this is just my point to a T of why I like the whole relief thing it isnt that I dont like the gate valve itself it just sucks to pay the price for not having the Gate set up right.
You want the water from the pump to cool the motor why don't you wanna dump the excess pressure overboard??? You can with a relief set up a gate is a lil trickier thats all I'm trying to point out
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The hole that is below the tstat housing u can put pressure gauge their I think.
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The only thing I have is a gate valve no relief valve. The valve you might me seeing is my Header T for the header before the headers. I guessing HP is around 450 and up but no higher then 500. At ideal I'm at about 130 140 temp. Driving at 3000 to 4,500 and 5000 I'm at 100 if that. My dump is 1/2in and yes it reduces down at the end on transom. Might be on to something there. Also I will turn my gate valve down a little. I'm thinking I just have to much pressure but that's just a guess. The motor is fresh rebuilt and about 5 trips on it. No issue on performance at all motor rocks besides milky oil. Oil pressure is good and stays good the hole time. I'm going to check some things out and reset some things. Hope it get better. Thanks a bunch GT for your info. :-)
Brian
Your outlet on the dump fitting needs to be between 3/8" and 7/16", your temperature really needs to be at about 150*F at idle, should drop to about 120 at WOT. If the dump is too small, the pressure will build too high. The temperatures seem reasonable, the problem is, if the dump line is too small, that really accentuates the pressure problem.
Pick up an over sized dump fitting, or drill the one you have to about 7/16" and throttle the gate until the motor reaches 150 degrees at idle and the headers are starting to mist close to 1800 RPM.
This will eliminate any and all issues with pressure.
Are you running an oil cooler?
Do you have an oil temperature gauge? I think you have a simple problem.
exact example of the infamous Gate Valve.
If not set right WAY TOO much pressure coming through your gaskets Its not the PCV its the pressure from the pump forcing the water past your gaskets.
This is why I dont like the gate the gate isnt necessarily the issue but the lack of knowledge operating it. Now be carefull not to back it down too much and blue those headers. Gt does have a good procedure to set the gate up I forget what it is but I'm sure he will let you know.
Youll get it right this is just my point to a T of why I like the whole relief thing it isnt that I dont like the gate valve itself it just sucks to pay the price for not having the Gate set up right.
You want the water from the pump to cool the motor why don't you wanna dump the excess pressure overboard??? You can with a relief set up a gate is a lil trickier thats all I'm trying to point out
While I will agree that the set up is a bit cumbersome at the beginning, it really is a set it and forget it system once it works.
The issue is, if something is missed, or miscalculated, it wont work. The system you have used does make slop count the same as skill, just don't like all the moving parts, especially on a river deal, the sand will make life miserable.
Your point is taken.... ;)
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Thinking of some things and reading some of the input you guys wrote. This weekend I'm going to pull my intake and inspect for cracks and make sure gaskets are okay. I think I might be getting a leak between the ram and head somewhere. Won't know until I pul it and inspect. I will keep you guys posted when I check some things out this weekend or maybe some time this week. Plumbing should be okay never had issues before. Next step is going to be the ram and gaskets. Thanks again for the help and ideas from all that reply. That's why I love this site. Everyone helps and learns alot from everyone.
Brian
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Well I think I found the problem guys. I pulled my ram and started to inspect things. Gasket looked good and no tears or signs of leaking past the gasket. Started looking at the block and I found a hair line crack that go's right on the left side water jacket. I pulled my water drain plugs and nothing but water on the right side good deal. Pulled the left side and had oil coming out of the hole. It all make since now. When I got the motor done and ran for tuning before it ever had water in it. I saw a little oil coming out of that drain hole. I plugged it up thinking in build I got some oil down in the hole some how. So now that I have water in the oil and yes I found the crack it all comes together. Just wanted to let you guys know what found and now I'm off to repair and hope for the best. Thanks again everyone and GT for you inputs. Here are some pics
Brian
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Only my luck but it happens and will be fix. Now time for a beer.