LT1 Crankcase Vacuum Pump Kit in Development
Thread Starter
Joined: Oct 2005
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From: Fairfax, Virginia
LT1 Crankcase Vacuum Pump Kit in Development I have been exchanging ideas with GZ Motorsports about making a crankcase vacuum pump kit for a f-body LT1. My approach is the mount it where the A/C compressor was. So this would only be for people without A/C. The idea is to have it running off the serpentine belt with the alternator and power steering in the stock location.
I'm in need of some help right now. My engine is at the machine shop otherwise I would do this myself. We need to find out how far out the vacuum pump can sit without hitting the frame rail or anything else that could hit it. I think the best reference point would be the distance from the frame to the A/C mounting bolts (on the accessory bracket). If anyone can measure that for me I would really appreciate it.
I'm in need of some help right now. My engine is at the machine shop otherwise I would do this myself. We need to find out how far out the vacuum pump can sit without hitting the frame rail or anything else that could hit it. I think the best reference point would be the distance from the frame to the A/C mounting bolts (on the accessory bracket). If anyone can measure that for me I would really appreciate it.
everyone running a vacuum pump has long deleted A/C and almost certainly power steering as they're not doing much street driving, so they're probably running a low mount alternator. Those guys would be stuck running a mandrel/gilmer belt setup on the drivers side as a common belt with the alternator wouldn't have enough crank pulley contact area.
everyone running a vacuum pump has long deleted A/C and almost certainly power steering as they're not doing much street driving, so they're probably running a low mount alternator. Those guys would be stuck running a mandrel/gilmer belt setup on the drivers side as a common belt with the alternator wouldn't have enough crank pulley contact area.
yes, but they're not meant for a daily driver type. They build a lot of heat in the pump depending on how much vacuum you're pulling, and how long/hard (yes long and hard 
) you're running them. The biggest benefits are seen when you're running an appropriate ring package, and pulling say 15+" or so. But at that level you're looking at wristpin problems (lack of oiling) with extended run time, and sucking a substantial amount of oil out of the crankcase. At lower levels of depression you'll still see benefits, but for 800 bucks I can think of quite a few alternatives on a street car.
) you're running them. The biggest benefits are seen when you're running an appropriate ring package, and pulling say 15+" or so. But at that level you're looking at wristpin problems (lack of oiling) with extended run time, and sucking a substantial amount of oil out of the crankcase. At lower levels of depression you'll still see benefits, but for 800 bucks I can think of quite a few alternatives on a street car. Not trying to **** on the idea. But even for my motor there's other things that I'd rather spend my money on. Vacuum pump will be up there with an accusump, gun drilled axles, lightened R&P, etc when I have to actually look hard for every hundredth.
Thread Starter
Joined: Oct 2005
Posts: 1,687
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From: Fairfax, Virginia
everyone running a vacuum pump has long deleted A/C and almost certainly power steering as they're not doing much street driving, so they're probably running a low mount alternator. Those guys would be stuck running a mandrel/gilmer belt setup on the drivers side as a common belt with the alternator wouldn't have enough crank pulley contact area.
I'm trying to get this kit made because it's the ONLY place I have available for MY motor. And if someone else can benefit from this, great.
Vacuum pumps are pretty helpful if your running a lot of boost. Increased ring seal which reduces blow by. No more over pressurizing the crankcase and blowing oil out of seals.
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For street NA motors that have some blowby, what about a WOT switched electric pump? It could use a WOT switch from a nitrous setup then at WOT, when pressure is built up, the pump would kick on to pull the vacuum on the crankcase?
Thread Starter
Joined: Oct 2005
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From: Fairfax, Virginia
Post some pics! You and one other person are the only ones I know who run the GZ setup (cz28 member mzgpx5 http://s306.photobucket.com/albums/n...p%204th%20gen/). This is a good thing to have if you're FI and I've been wanting one for too long as it is.
I've been wanting to put a VP on my car for so long. I gave up on the idea because there wasn't any kit that would work for my setup. I started brain storming again and made some measurements to find out a vacuum pump would fit nicely where the A/C was.
I just need that measurement before I can go any further.
What's your setup like SRZ? Would my idea work for you too?
Yeh mzgpx5 is the only person I have seen using a vacuum pump on an LT1 that wasn't stripped down to just a alternator and VP. But his setup is crazy complicated and also requires a vertical radiator.
I've been wanting to put a VP on my car for so long. I gave up on the idea because there wasn't any kit that would work for my setup. I started brain storming again and made some measurements to find out a vacuum pump would fit nicely where the A/C was.
I just need that measurement before I can go any further.
What's your setup like SRZ? Would my idea work for you too?
I've been wanting to put a VP on my car for so long. I gave up on the idea because there wasn't any kit that would work for my setup. I started brain storming again and made some measurements to find out a vacuum pump would fit nicely where the A/C was.
I just need that measurement before I can go any further.
What's your setup like SRZ? Would my idea work for you too?
Great idea, I have been trying to figure this out for a while myself. Us boosted guys need a solution like this, since the drivers side is taken up by the s/c or turbo. I agree Jen, tool is awesome.
What about us guys with street cars and full accessories, I have the Speed Inc accesory relocation kit that keeps ac and ps but moves the alt to drivers side lower, would a vac pump fit where the alt used to be? Also what's the max vac you guys would run on a dd n/a engine?
Thread Starter
Joined: Oct 2005
Posts: 1,687
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From: Fairfax, Virginia
What about us guys with street cars and full accessories, I have the Speed Inc accesory relocation kit that keeps ac and ps but moves the alt to drivers side lower, would a vac pump fit where the alt used to be? Also what's the max vac you guys would run on a dd n/a engine?
With how your accessories are mounted, you would need the vacuum pump kit that puts it on the driver's side head. You would only need to relocated your coil/icm which is not difficult.
Does anyone know how close the frame is to the A/C mounting bracket??
Great because I'm not running the LT1 ignition anymore, I have the EFI Connections 24x kit with 8 LS2 coils. Do you have a pn for the street vacuum pump kit that mounts to the drivers side head and maybe some pics, thanks?
