Offshoreonly.com - How to prevent oil from pushing through breathers?

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- - How to prevent oil from pushing through breathers? (https://www.offshoreonly.com/forums/general-q/178921-how-prevent-oil-pushing-through-breathers.html)

mrhorsepower1

02-04-2008 07:56 PM

Quote:

Originally Posted by BenPerfected (Post 2431731)

I run a vacuum pump and it is great for oil blow-by control. I don't agreed with the 30+ hp in a wet sump marine application. My dyno experience with standard tension oil rings @ 15" of vacuum is less than 10 HP. Any more vacuum than 15" caused my oil pressure to fluctuate on the dyno...VP fighting the oil pump.
For absolute blow by control on a wet sump system, all you need is any negative pressure. To rig this VP system right, figure on a $1500+ project.
You can use one VP on twin BB....works great.

I have seen on average 30+ HP and can guarantee this with 15 inches of vacuum. This will not cause oil pressure to fluctuate. Believe me, I have been able to pull 40 inches of crankcase vacuum on my NHRA Pro Stocker and it does not effect oil pressure. I use one pump per engine, on pleasure boat applications I run 15 inches all day long.

mrhorsepower1

02-04-2008 07:58 PM

Quote:

Originally Posted by nwimbush (Post 2431504)

:cool-smiley-027:
Yeah, MrHP1, perhaps you cna show us which part goes where? I've attached a spec for reference...:party-smiley-048:

:Whatever:

BenPerfected

02-04-2008 08:23 PM

Dean,
30+ HP at 15" of vacuum with standard tension or low tension oil rings?
Ben

Revd Up

02-04-2008 08:42 PM

Quote:

Originally Posted by BY U BOY (Post 2431807)

Why not just run some hoses to the flame arrester??

That's what I did. No more oil film on my clean engine.

Vinny P

02-04-2008 09:31 PM

Quote:

Originally Posted by Pantera28-650HP (Post 2433018)

I plan on using fuel tank foam in the adapter prior to the hose running up to the puke tank.

Kirk,

I was thinking the same thing. :D

articfriends

02-05-2008 12:34 AM

2 Attachment(s)

Vinny,I extended my tubes on the valve covers like I have done on circle track motors,I also mounted both tubes to the front of the valve covers(no rear) so the oil won't climb up the vent from high speed. When my rings start to get tired/leakdown goes up before I freshen the motor I run rolled up scotchbrite in the tubes to help stop the oilfrom making its way out. I tried a homeade puke tank using -8 hoses to a small tank on a blown 502 years ago but the oil would vent out of the tank and it started pressurizing the motor and pushing the seals out,Smitty
I attached a couple of pics,if you look close you will notice the breather elements on top of the tubes,the tubes are approx 10" tall.

mrhorsepower1

02-05-2008 07:17 AM

Quote:

Originally Posted by BenPerfected (Post 2433111)

Dean,
30+ HP at 15" of vacuum with standard tension or low tension oil rings?
Ben

Standard tension. With the low tension I have seen about 7 HP or so more. I have dynoed about 50 engines we have done alot a vacuum testing on and every one has had the same gains in power. I have a new system which is going through the patent office right now.

BenPerfected

02-05-2008 09:44 AM

Here is some more info/opinions on engine vacuum.
http://speedtalk.com/forum/viewtopic.php?=&p=49495

Vinny P

02-05-2008 07:23 PM

Smitty,
I have thought about extending the height of the breathers as you did. Today, I have come to a decision on what I am going to do. I ordered Imco's 10" x 3" puke tank. I came up wih a good way of using my existing valve cover adapters to plumb 2 -12 AN lines to the tank. I can incorporate enough fuel cell foam in the adapters if needed to limit the flow. It should look good, I just hope its functional.

MM1	02-05-2008 11:24 PM

Quote:

Originally Posted by Vinny P (Post 2431238)

Thanks, that is what I was thinking of. The only problem is I cant find anything to screw into the covers, except for what I have. Anyone done something similiar with 2 piece Eckerts like I have?

I had the same problem with a customers boat last year and I welded # 16 fitting into the valve covers, repowder coated them and ran hoses to the flame arrester. Problem solved

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