Vacuum pump

[kod99]

I just put a Moroso vacuum pump on my 598 BBC and was wondering if I could connect the pump intake to my existing breather caps. The valve covers are chrome and I am worried about damaging them if I drill new holes for the intake. Has anyone drilled chrome plate before and had success?
The pump intake line is #12 and the outlet on the breather caps is #8.

[fla1976]

There are breather made that already are designed for that purpose.
Is this what you need. The items below the breather clamps.

http://www.jegs.com/i/CSR/170/680/10002/-1

[kod99]

I already have breathers on the valve covers. They were tied in to my headers for evacuation before. The outlet on the breather is #8 AN and I would like to tie the intake line from the vacuum pump into these fittings. Can I do it? If so, do I need to tie into one or both?

[fla1976]

If it already has a #8 AN fitting, it is easy to plumb it to a pump. What fitting is on the pump. More than likely it is straight pipe. Any decent hardware store will have the fittings,except the AN. The AN can be picked up at a local speed shop or call Ron Owens and he can probably set you up.

http://ronowensracing.com

[hammertime]

I just put a Moroso vacuum pump on my 598 BBC and was wondering if I could connect the pump intake to my existing breather caps. The valve covers are chrome and I am worried about damaging them if I drill new holes for the intake. Has anyone drilled chrome plate before and had success?
The pump intake line is #12 and the outlet on the breather caps is #8.

Easy fix, get a big enough drill bit and put duct tape on both sides of the hole and redrill it bigger. I've done this more then once on chrome.

[chevyfireball]

x2 Drill it. You only need to be tapped into one valve cover. Plug the other one.

[al34]

you will also need a relief valve on the valve cover if you are not using one on the suck fitting

[hammertime]

you will also need a relief valve on the valve cover if you are not using one on the suck fitting

thats not 100% true. You may or may not. depending on the pump, pulley sizes you run.


This is what you need in your valve cover, but be sure the rockers are not close to hitting on the bottom.
http://www.jegs.com/i/Moroso/710/22635/10002/-1

[kod99]

Thanks for the help guys! It's good to know that if I have to, I can drill the valve covers without damaging the chrome, David.

I would still like to know if I would get enough suction to the pump by routing the suction line to the two #8 AN fittings on the breather caps? Has anyone done it this way?

I have a Moroso relief valve that screws into the pump.

Here is a pic of how the breathers are set up now for header evacuation.

http://i205.photobucket.com/albums/bb149/reagannelson/Dragster/PSPdragster026.jpg

[hammertime]

I have a buddy who just tapped the top of the breather and put a 12an fitting in the top of it and capped the side. If it were me, id just drill the valve cover out it'll look much better.

[degnitz_3732]

What kind of pump are you putting on? I am going to be purchasing a pump in the next few weeks...does anyone recomend one over the other. Currently i'm leaning towards the Aerospace Kit. Also, when I start the motor for the first time this spring....what should the Vaccuum gauge read??? I've been told many different things....i'd like to set it at idle and then watch it downtrack obviously. Where do you start? Any help appreciated.

Derek

[markdunlap]

I purchased that Aerospace kit a few years ago. The salesman was very helpful and a made suggestions as to what front and rear seal to run and how to make sure engine was sealed good to get max vacuum. Kit looked nice and fit nice. But it would not produce near enough vaccum. About 3" at idle and 6" at RPM. I tried to work with them and they suggested I adjust the end play and reshim and so on, but never made it any better. They never offered to let me return it and just kinda said "Oh Well". I have not bought anything from them since.

Moroso Vacuum pumps would be my choice.

[hammertime]

Vacuum Pumps

Star and Moroso are the tops, I've had both and run a Moroso with great luck. Aerospace has had many issues with keeping up and the mandrel is 1.5" unlike everything else which is 1" diameter.


I go for 5 at idle and 10 down track.

[kod99]

What kind of pump are you putting on? I am going to be purchasing a pump in the next few weeks...does anyone recomend one over the other. Currently i'm leaning towards the Aerospace Kit. Also, when I start the motor for the first time this spring....what should the Vaccuum gauge read??? I've been told many different things....i'd like to set it at idle and then watch it downtrack obviously. Where do you start? Any help appreciated.

Derek

Derek,
I put on a Moroso #22642. I looked at the Aeorspace kit, but feedback from racers around my area was that it was weak.

http://www.moroso.com/catalog/categorydisplay.asp?catcode=17200

[al34]

[quote=al34]you will also need a relief valve on the valve cover if you are not using one on the suck fitting

thats not 100% true. You may or may not. depending on the pump, pulley sizes you run.


every set up i have seen has a devise to relieve vacume at a desired point so there may be a few set ups without a vacume relief devise but most are using it

[chevyfireball]

I use a Moroso on my 632. Its tapped into the end of the valve cover so theres no rocker contact issues.