VACUUM PUMP FOR HEMI?

[8stackhemi]

I'm curious, has anyone ever used the Saginaw OEM style pump used by GM and Ford for this application? I'm figuring they would be cheap enough and serve the purpose?

 

[Hemirunner]

Are you running full exhaust with those evacs? If so, that’s probably an issue.

Or even running collector mufflers with those can be a problem. Too much backpressure and not enough flow to keep the check valves open.

Disconnect the evacs, stick a breather in each cover and see if your leak stops.

 

[MOPOWER871]

lots of good info on vacuum pumps , my buddy runs one of their street pumps zero issues.
www.gzmotorsports.com

 

[8stackhemi]

Are you running full exhaust with those evacs? If so, that’s probably an issue.

Or even running collector mufflers with those can be a problem. Too much backpressure and not enough flow to keep the check valves open.

Disconnect the evacs, stick a breather in each cover and see if your leak stops.

I do have tti headers, tti x-pipe, dynomax mufflers & trumpet tips ending under passenger compartment, NOT full length system to rear bumpers.

 

[Hemirunner]

I do have tti headers, tti x-pipe, dynomax mufflers & trumpet tips ending under passenger compartment, NOT full length system to rear bumpers.

Your evacs aren’t doing anything with all of that exhaust. Try a couple of breathers for a while.

 

[8stackhemi]

I have the Moroso 4 vane on my Hemi.

View attachment 574476 View attachment 574477

Right now, the 8-stack EFI is being installed and the evac hoses have been eliminated too, to see if that helps.
I have two questions:
Does your car have a full exhaust system?
Is your Moroso 4-vane effective & do you have any rear main leaks?

 

[6PKRTSE]

Right now, the 8-stack EFI is being installed and the evac hoses have been eliminated too, to see if that helps.
I have two questions:
Does your car have a full exhaust system?
Is your Moroso 4-vane effective & do you have any rear main leaks?

No, I have 3" Bullet Mufflers dumped under the car. No up over the axle tail pipes.
Yes, it was effective & made more power on dyno. Not as much as we were hoping due to I am running a 1/16, 1/16, 3/16 ring pack since it is still street driven & not just a full race engine with much thinner less tension rings. No rear main seal leaks either. It's been two years and not a drop under the car.

 

[8stackhemi]

No, I have 3" Bullet Mufflers dumped under the car. No up over the axle tail pipes.
Yes, it was effective & made more power on dyno. Not as much as we were hoping due to I am running a 1/16, 1/16, 3/16 ring pack since it is still street driven & not just a full race engine with much thinner less tension rings. No rear main seal leaks either. It's been two years and not a drop under the car.

May I ask, did you have any leaks before adding the Moroso pump??

 

[6PKRTSE]

May I ask, did you have any leaks before adding the Moroso pump??

No, never before on any of my other engines without one. This engine has always had one though.

 

[Hemirunner]

May I ask, did you have any leaks before adding the Moroso pump??

Have you checked all the obvious things like the rear main seal retainer hitting the #5 main cap and/or studs and nuts? Side seal issues? Ring seal problems? Etc.