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  Vacumn pump help please

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Author Topic:   Vacumn pump help please
Fstln69
Gearhead

Posts: 325
From: Westmont,il
Registered: Jan 2003

posted 07-07-2003 07:50 PM     Click Here to See the Profile for Fstln69   Click Here to Email Fstln69     Edit/Delete Message   Reply w/Quote
Let me start out by saying that the reason i am asking this question here is because of the wealth of knowledge that is accumulated here(kissing up..lol)
Ok this is not for a ford its for MY race car which is a chebbie.I need to go to a vac pump setup and am leaning towards the moroso 3 vane setup (wetsump motor).Anyone here running them or any pumps??This is a BIG compression big inch nitrous motor so a vacumn pump is a must a just need help making my final decision before laying out the cash
Thanks Dennis and sorry for the chevy help question

------------------
69 fairlane 351w 12.94@103mph before M&M.. [email protected]
always in search of more HP and faster ET'S

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steve'66
Gearhead

Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-07-2003 08:50 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
I think the Morosso 3vane is a good pump. I don't have personal experience though. Butch runs one a vac pump on his 9 second nitrous's Merc. Maybe he'll be along to give you an opinion.
Here's a link to a good article,

http://www.dragstuff.com/techarticles/vacuum-pumps.html

SteveW

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Butch Jennings
Gearhead

Posts: 582
From: No. California
Registered: Apr 2000

posted 07-09-2003 06:28 PM     Click Here to See the Profile for Butch Jennings   Click Here to Email Butch Jennings     Edit/Delete Message   Reply w/Quote

I've run vacuum pumps on my car quite a bit over the last few years. I was running stock smog pumps on my FE motors and kept melting the vanes in them. Besides not being designed to run in an oily environment, I found out that I was turning them way too fast.

I was told that 5000 rpm was about the max that I should be turning them and I was turning mine 7000+ rpm. When I switched over to the 460 I made a small pulley to fit the Fluidamper that runs the pump around 50% to 60% of crankshaft speed.

I ran a 4 vane Moroso pump with a relief valve on it when I first got the 460 running and it worked awesome. I burnt 3 pistons in it right away and never got the ring seal right after that because of 2 half-assed hone jobs to re-ring it twice after that.

I just got it running again with a different block that has a fresh, quality bore and torque plate hone job so the rings should seat right this time. I've got a 3 vane pump on it now without a relief valve (I'll get one if I need to) but I haven't run the car at the track yet.

It pulled 10" of vacuum at 3000 rpm in the driveway with about 5 minutes of runtime on it, so I think it's going to pull some good vacuum when the ring seal tightens up.

I can't tell you for sure what it was worth for power since I had so many other factors with breakage and whatnot, but it kept gaskets in it real nice and I was never able to run within a tenth of it's best time after I pulled the pump off....even after switching to alcohol for a while.

The reason I went with a vacuum pump in the first place is because I started running mufflers and lost the ability to run my traditional pan evac system into the collectors. After looking into running a pump I started hearing stories of power gains, I didn't look into a pump originally because I was looking for a power gain....I was just trying to keep gaskets in the motor.

------------------
Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.231
Butcher's Home Page
"Friends don't let friends drive Chevys"

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