Hi all, Thought I would share this with you guys. I bought a new Moroso 3 vane vacuum pump, 5" pulley and sbc/bbc bracket. I was thinking that I would have a bit of a mission on my hands getting the pump mounted and aligned properly. To my surprise, the bracket bolted straight up to the head and aligned nicely. I have a mandrel that Steve Reynolds built for me. So the pump works well, giving me 12-13" of vacuum above 2500rpm. When the engine was on the dyno, the vacuum pump gave us a power increase around 35hp. Cheers
Hi Jim, This engine is built with low tension rings and coated pins, the reason we need that vacuum. Cheers
You. Sure you have that on the correct side of the motor. Being down under n everything. :beers2: Cheers MR HARDcastle!
If you move your seat directly over the rear end you will also get the FEELING of an additional 150 HP.
On a serious note . I thought the vac plumbing was more for the bottom end . Why suck out from the valve cover? Or is that not a dry sump deal u got there
Wet sump deal here. Would have liked the dry sump, but just didnt go that way, coz I was already spending a large amount and couldnt budget that in. Cant really justify it as the wet sump is working well after a few teething problems. Held a solid 55psi with 12" vacuum at 6500rpm. Cheers
The reason to lower the vac is because there is a tendency to pull oil away from the pins and top end, as well as disrupting splash. I always set mine at 8-10 to keep this from happening. And I didnt drive it on the street like you.
That's a nice looking pump! I pull vacuum out of the PCV valve opening in the intake where it's baffled by the intake gasket (or splash pan) plus added one more baffle to it on the underside of the intake. Is there a regulator on it? If it's across the engine from the pump inlet it's going to pull more oil than if on/near the pump inlet. It's amazing what crankcase vacuum does for ring seal, then of course reducing drag on the crank.
