Dry sump venting open or closed.

[Morris]

Originally Posted by Ant

Thank you for the photos, that is a good adequate system I gather the FE can breath a bit more compared to SBF when you have the hp and rpms like you have.

We believe that the more you can allow a motor to breath..... the better it is.... When you get half way thru a race ..... and it's hot and everything has a strain on it .... you are glad it can breath....

Vacuum is for short drag racing type of motors....... not extended time on a track.... like a Cobra is made for...

Look at the 3 Scavenge section hose on the back of the intake....

[PLDRIVE]

Originally Posted by Morris

We believe that the more you can allow a motor to breath..... the better it is.... When you get half way thru a race ..... and it's hot and everything has a strain on it .... you are glad it can breath....

Vacuum is for short drag racing type of motors....... not extended time on a track.... like a Cobra is made for...

Look at the 3 Scavenge section hose on the back of the intake....

You might want to tell NASCAR that. They pull 18+Hg for 500 miles every Sunday.

[Morris]

Originally Posted by PLDRIVE

You might want to tell NASCAR that. They pull 18+Hg for 500 miles every Sunday.

That's right.....and the thickness of their scavenge sections are the reason for that.......a Cobra just doesn't have enough room for the size of their pump .... 4 scavenge sections and a pump section.....also the newer pumps are much more efficient then the older pumps..... On our Cobras ....their is barely enough room in the motor area....at least not in our FE configuration.

[Cobra #3170]

Originally Posted by Morris

That's right.....and the thickness of their scavenge sections are the reason for that.......a Cobra just doesn't have enough room for the size of their pump .... 4 scavenge sections and a pump section.....also the newer pumps are much more efficient then the older pumps..... On our Cobras ....their is barely enough room in the motor area....at least not in our FE configuration.

For what it's worth I am pulling 13" of vacuum on my 498" FE, I have a Dailey
Dry Sump with #16 lines to and from the tank. My valve covers are sealed
and the only vent is on the Stef's dry sump tank in the trunk. I have not really had any problems with this system and don't seem to have an oil vapor problem in the trunk. We tried it on the dyno with vented vs unvented valve covers and there was a difference of about 20 HP. What I really like is the engine compartment stays really clean compared to the times I had remote valve cover breathers with baffles etc. The only time oil gets out of this thing is when it is not running, then it leaks like an old Harley.

[Morris]

Originally Posted by Cobra #3170

For what it's worth I am pulling 13" of vacuum on my 498" FE, I have a Dailey
Dry Sump with #16 lines to and from the tank. My valve covers are sealed
and the only vent is on the Stef's dry sump tank in the trunk. I have not really had any problems with this system and don't seem to have an oil vapor problem in the trunk. We tried it on the dyno with vented vs unvented valve covers and there was a difference of about 20 HP. What I really like is the engine compartment stays really clean compared to the times I had remote valve cover breathers with baffles etc. The only time oil gets out of this thing is when it is not running, then it leaks like an old Harley.

Well that just shows that being out of commission for a few years will do for you....Thanks for the info on the Daily pump....and it appears to be smaller...

We tried sealing up the motor before and it never worked....and I did it like you did, by closing up everything but the dry sump tank....should of looked at a different pump......Thanks again and will get on it....

[PLDRIVE]

Morris i have the same Dry Sump setup on a small block as Cobra 3170. Tank in trunk (Patterson), -16 lines to and from a 5 stage Aviaid S2 pump, one remote breather off of tank. I have not run the engine yet, but planning on about 10 to 12Hg. and hopping for a cleaner engine bay as well.
They will fit, but you my have to make up your own brackets.

[Ant]

I am now running a 4 stage pump which includes an air/oil separator, this setup requires a vacuum regulator, as the manufacturer mentioned it may make upwards to 19in/hg and I anticipate running about 12in/hg of vacuum.

I have read where I will need a pop off valve incase of a pressure situation, so what I thought was as the vacuum regulator can fit into an O ring thread on my valley cover behind carb, and leave the valve covers clean without any plumbing.

Plumbing the pop off valve from where the mechanical fuel pump used to be on SBF, and if I wanted to use a normal breather for road use just remove the pop off valve, the question maybe is the fuel pump area on the block a good place to take a breather from....

any thoughts.