Vac pump 202

Just starting to set up engine breathing set up on the 202. The catch can I have turns out is designed to be used in line with a morosso vac pump. I think it'll do the job for now fingers crossed. Does anyone know the advantages of using one of these pumps on a mild engine if I want to go the next step? My engine will be sitting on 6300 for a long time and I think right now with the engine nice and new I will probably vent it all ok. I've read on the morroso site that the pump will give more power with better ring seal.

One of the benefits of high levels of crankcase vacuum is that it reduces the oil cloud significantly, so that there is much less oil hanging around the crank and drainback to the pan is improved. This helps power but also reduces pin oiling, often to the extent that it becomes a problem. I'd be especially wary if I was still using pressed pins. The usual procedure is to use floating pins with bushed rods and an oil hole in the rod plus additional oil feed holes running from the oil ring groove to the piston bosses.
For a short duration drag engine it might be a good idea but for something like a boat that runs at full load for a longer duration I'd be thinking twice about it. The power benefits are mainly at higher rpm (say 7500+) and I think there is probably more power to be had from head and cam work - it's one of those things I might consider when there was no more power to be made from anywhere else.
If it was me I'd just be sticking a plain old vac-u-pan on it.

Edited by oldjohnno, 19 December 2011 - 06:10 AM.

I have been using the moroso 3 vane vac pump on a red 202 for a few years now. take it from some one that's doing it there is some trial and error in fitting this setup to a holden 6 and getting it to work properly.the engine internals are designed around using a vac pump so there was no problem there.

the new boosted eng will still have the provisions to use it but ive changed the oil ring tension so it wont be a necesity.

Cheers

Well I don't have any internal provisions on either engine so I suppose I'll give it a miss. The new single weber engine has a 3/4 hose out of the sump with a baffle built in, a 3/8 PVC line manifold to r/cover with the PVC valve, and a vented oil cap the 3/4 line has the catch can. Is the idea that air goes in the rocker cover and out the sump line? Should I disconnect the pcv? I'm setting the triple carb engine up with an experimental dry sump set up, I've got a 2 stage belt driven scavenge going to a tank 2 X -8 lines, and a -12 going from the tank to the factory oil pump external pick up point. The idea is because the engine is sitting 12 degrees when it's flat, I want to pull oil away from the shallow end of the sump, I hope I don't have any dramas as there is nothing special in regards to pin oiling, I don't expect this version of dry sump to pull much vacuum, I've actually got fingers crossed it'll keep up the oil to the tank.. It's actually a diff cooler pump.

take it from some one that's doing it there

Was that aimed at anyone in particular?

just in general mate,

i realise there is alot of info on this topic on the net that may or may not be relevent to a holden 6 as im sure u will know.

Cheers H