How to prevent oil from pushing through breathers?
02-04-2008 | 07:56 PM
#31
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Joined: Feb 2005
Posts: 1,459
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From: Cleveland, Ohio
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.
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.
02-04-2008 | 09:31 PM
#35
Thread Starter
I hate the winter!!
Joined: Jul 2001
Posts: 2,707
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From: long island, new york
02-05-2008 | 12:34 AM
#36
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Joined: Jun 2004
Posts: 7,317
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From: frankenmuth michigan
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.
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.
02-05-2008 | 07:17 AM
#37
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Joined: Feb 2005
Posts: 1,459
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From: Cleveland, Ohio
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.
02-05-2008 | 09:44 AM
#38
Platinum Member
Joined: Dec 2002
Posts: 2,195
Likes: 2
From: Dallas, TX
Here is some more info/opinions on engine vacuum.
http://speedtalk.com/forum/viewtopic.php?=&p=49495
http://speedtalk.com/forum/viewtopic.php?=&p=49495
02-05-2008 | 07:23 PM
#39
Thread Starter
I hate the winter!!
Joined: Jul 2001
Posts: 2,707
Likes: 0
From: long island, new york
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.
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.
02-05-2008 | 11:24 PM
#40
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Joined: Apr 2006
Posts: 148
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From: HUNTINGTON BEACH, CA.
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
