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I know there not good for the street, removes oil from the wrist pins.

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According to the guys on YB, that's on old wive's tale....... Consensus is the more vacuum, the better.....

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Going through friends 528 Wedge with CNC ported Indy heads. He bought it complete a couple of years ago from states, and it really hasn't performed according to expectations. I'll tear it a part and check it, and while at it he wants to install avacuum pump since the engine was designed to use one. What all is needed, and where to get the parts from? As far as I've understood,you aim at certain vacuum and limit it with aomekind of a leak retriction? Any good links or articles?l

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There are a few companies that make a decent vac pump...
Moroso makes 2 versions a 3 vane and 4 vane... I
have a Aerospace unit and I dont care for it(doesnt
pull enough)... with all the reading I did I found
that you dont want to exceed 14"HG or you get into
wrist pin oil issues... I pull 12"HG with just my
dry sump pump.... what do you need... the pump, lines
(I used braided lines), a good baffle in the valve
cover and a puke tank to catch any oil that the pump
pulls out(get a good one...get one that enters near the
bottom... if it inters near the top it sprays oil/mist
into the exiting air flow path and out the breather)...
then the only other thing would be the check valve
that would be mounted to the other valve cover...
some are adjustable, some fixed for the setting..
back to the pump... Moroso says the 4 vane was race
only and will pull more than 14", there is another
good pump(forget the name but its Motorsport something)
and they sell all the parts... also you need a drive
system... crank pulley and belt.... some but not all
of the pumps come with some sort of mounting....
thats about all I can think of

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I know there not good for the street, removes oil from the wrist pins.

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According to the guys on YB, that's on old wive's tale....... Consensus is the more vacuum, the better.....

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Not according to Rehere Morrison(sp) thats where I
read my info from

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I know there not good for the street, removes oil from the wrist pins.

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According to the guys on YB, that's on old wive's tale....... Consensus is the more vacuum, the better.....

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Not according to Rehere Morrison(sp) thats where I
read my info from

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Word is that the reason guys were hurting wrist pins back when that theory was started is because the pins were too weak and flexing.....not because of lack of oil..... Check out this link;

Vacuum thread on Yellow Bullet........

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It's funny how many people say not to run too much vacuum because it'll pull too much oil from the wrist pins but none have personaly experienced it......or tried any higher.....even the guy that posted in the link above said he's ran as much as 20" without any problems but was scared so he lowered it back down to 15"......

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On your link to YB the guy was running high vac
on nitrous applications where you have greater blow-by
and the vac was dropping during the run... he was actually
starting at 25"hg but ending the run at about 15"hg
so by rights he isnt running high vac

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On your link to YB the guy was running high vac
on nitrous applications where you have greater blow-by
and the vac was dropping during the run... he was actually
starting at 25"hg but ending the run at about 15"hg
so by rights he isnt running high vac

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True dat......

Read this thread on YB too.......... .....He says they run 25-26" on wet sumps, dry sumps, and naturally aspirated motors too....... and "We dont see any oiling trouble with high 25+ inches..old wives tale ALL PS car teams run all they can get
It makes more power the more you make it. The more you start with the more you have in reserve.
Starting with the highest you can get will not be enough at the finish with all the guns on.
The rings will stay sealed better and longer with 20" anything

Free, secret tip of the day ".....

It's all food for thought......I'd like to hear from someone that's been running a sorted out combo and they went up on vacuum and immediately started having wrist pin galling problems.....