LT1 Crankcase Vacuum Pump Kit in Development
12-15-2012, 01:21 PM
#121
1. Will need new centerbolt valve covers with the GM heads
2. Will have to re rout wiring to the alternator. I am no good with wiring and I have the fuel pump harness linked up with it.
Is there a way to measure crank case pressure?
12-15-2012, 04:34 PM
#122
TECH Fanatic
Thread Starter
iTrader: (32)
Join Date: Oct 2005
Location: Fairfax, Virginia
Posts: 1,687
Likes: 0
Received 0 Likes
on
0 Posts
Will call GZ to confirm. Just have 2 other issues to solve.
1. Will need new centerbolt valve covers with the GM heads
2. Will have to re rout wiring to the alternator. I am no good with wiring and I have the fuel pump harness linked up with it.
Is there a way to measure crank case pressure?
1. Will need new centerbolt valve covers with the GM heads
2. Will have to re rout wiring to the alternator. I am no good with wiring and I have the fuel pump harness linked up with it.
Is there a way to measure crank case pressure?
Hook up a vacuum/pressure gauge somewhere on the crankcase like the valve cover. I have mind tapped into the stock PCV port on intake.
12-15-2012, 06:07 PM
#123
From the dead.
I used this setup and it works perfect! I put the pump where the AC was and left the Alt in the stock location. Everything fits like factory.
All of the lines went on without any issue and I used all 12AN parts. I was able to use the stock length belt and tensioner. I will have to take a few pictures tonight and host them up. I wish I would have taken a few before I put it all together. The pump is almost invisible down there...
I didnt change the Balancer as the cost to change it and all of the blower parts really outweighed the cost if this pump fails. I have a $1000 cog drive set up I could give crap if a $300 pump fails Ill just buy another or have it fixed. I spoke to GZ and they said it should hold up find even spinning it to almost 7k rpms. If the Pump fails it is max $150 to rebuild it plush shipping.
I used this setup and it works perfect! I put the pump where the AC was and left the Alt in the stock location. Everything fits like factory.
All of the lines went on without any issue and I used all 12AN parts. I was able to use the stock length belt and tensioner. I will have to take a few pictures tonight and host them up. I wish I would have taken a few before I put it all together. The pump is almost invisible down there...
I didnt change the Balancer as the cost to change it and all of the blower parts really outweighed the cost if this pump fails. I have a $1000 cog drive set up I could give crap if a $300 pump fails Ill just buy another or have it fixed. I spoke to GZ and they said it should hold up find even spinning it to almost 7k rpms. If the Pump fails it is max $150 to rebuild it plush shipping.
Question, since the pump pulls a bit of oil out, it just goes to a catch can correct? There is no feed back into the block. The pressure is just a one way ticket out of the block. Just making sure so I get the full picture.
Recommend a gauge for me. Will take a trip to the local Pep Boys tomorrow. Thanx
12-18-2012, 12:10 PM
#124
On The Tree
iTrader: (8)
Join Date: Mar 2003
Location: Las Vegas Nv.
Posts: 196
Likes: 0
Received 0 Likes
on
0 Posts
My balancer pulley is the stock size ATI Balancer I dont care about tearing up the pump. It will only spin so many times before it quits. when it does its cheap to repair ($150) or replace. I used the stock length belt as well. I spoke to GZ and they said they have never seen one fail from over spinning it. They said the pump will just not produce anymore vaccum.
Here are a few crappy iphone pics, I couldnt find my memory card for my camera. Dont mind the ugly pump pulley it was used for mock up, it has since been painted.
Here are a few crappy iphone pics, I couldnt find my memory card for my camera. Dont mind the ugly pump pulley it was used for mock up, it has since been painted.
12-18-2012, 01:18 PM
#126
On The Tree
iTrader: (8)
Join Date: Mar 2003
Location: Las Vegas Nv.
Posts: 196
Likes: 0
Received 0 Likes
on
0 Posts
The washers have been replaced too lol again these were the moc up pictures. I built a proper spacer for the bottom bolt. 
I found the pulley lying on the ground at the local pick apart. It was next to an old S10 truck and it worked perfect. I paid $2.00 for it. The cheapest thing I have ever bought for the car. The can of spray paint was more than the pulley hahah
I found the pulley lying on the ground at the local pick apart. It was next to an old S10 truck and it worked perfect. I paid $2.00 for it. The cheapest thing I have ever bought for the car. The can of spray paint was more than the pulley hahah
12-18-2012, 07:50 PM
#127
I'm surprised you placed the oil trap canister way back on the firewall. I haven't taken a look in my own engine bay but I figured it would be more easily accessible up front.
01-09-2013, 05:53 PM
#128
On The Tree
iTrader: (8)
Join Date: Mar 2003
Location: Las Vegas Nv.
Posts: 196
Likes: 0
Received 0 Likes
on
0 Posts
Ralls,
How much oil ar eyou getting in your catch can? I seem to be getting a lot
Thanks
01-09-2013, 09:00 PM
#130
TECH Fanatic
Thread Starter
iTrader: (32)
Join Date: Oct 2005
Location: Fairfax, Virginia
Posts: 1,687
Likes: 0
Received 0 Likes
on
0 Posts
Not that much. About an ounce every 500 miles. I drain it every once in a while. It's mostly water though. The oil is milky from being mixed with the water. Do you have a baffle on the valve cover side? It might be sucking up oil drops from the pushrods if not.
01-10-2013, 06:42 PM
#133
ralls.... are you still using the stock PCV system? or did you block everything off and just running the vac pump?
Last edited by daddyoisback; 01-11-2013 at 07:06 PM. Reason: spelling
01-11-2013, 11:54 AM
#134
Staging Lane
Join Date: Jan 2012
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
You need to have a sealed system to make a vacuum pump system work. It will be impossible to create vacuum with a huge vacuum leak like a PCV valve. I work at GZ Motorsports and built the prototype bracet in the pictures. We have had only a very few requests to develop a system for these motors, but we'll give all of the support we can.
Bill, WWW.GZmotorsports.com
Bill, WWW.GZmotorsports.com
01-11-2013, 01:58 PM
#135
On The Tree
iTrader: (8)
Join Date: Mar 2003
Location: Las Vegas Nv.
Posts: 196
Likes: 0
Received 0 Likes
on
0 Posts
Ralls,
We are talking oil all over the place out of the breather and about an inch in the moroso puke tank after about 5 passes on the street :/
When you say facing up are you saying pointed toward the intake?
I am pulling around 11" of vacuum @5500 rpms
We are talking oil all over the place out of the breather and about an inch in the moroso puke tank after about 5 passes on the street :/
When you say facing up are you saying pointed toward the intake?
I am pulling around 11" of vacuum @5500 rpms
01-11-2013, 04:36 PM
#136
You need to have a sealed system to make a vacuum pump system work. It will be impossible to create vacuum with a huge vacuum leak like a PCV valve. I work at GZ Motorsports and built the prototype bracet in the pictures. We have had only a very few requests to develop a system for these motors, but we'll give all of the support we can.
Bill, WWW.GZmotorsports.com
Bill, WWW.GZmotorsports.com
01-11-2013, 09:35 PM
#137
TECH Fanatic
Thread Starter
iTrader: (32)
Join Date: Oct 2005
Location: Fairfax, Virginia
Posts: 1,687
Likes: 0
Received 0 Likes
on
0 Posts
For reference, I just drained out my vented catch can. Filled up half a red Hefty cup with watery-milky oil. I can't remember the last time I drained it, but I know I have at least been on the dyno with dozens of pulls, 150 miles driving, and a few runs on the street.
Are you getting straight up clean oil in the catch can or is it nasty blow by and condensation?
01-11-2013, 10:12 PM
#138
On The Tree
iTrader: (8)
Join Date: Mar 2003
Location: Las Vegas Nv.
Posts: 196
Likes: 0
Received 0 Likes
on
0 Posts
Which direction is this pointed in the valve cover?
http://www.starvacuumpumps.com/products/STR.06.11.001
Which catch can did you go with? Never mind lol same one I bought. Where did you mount yours?
I am getting just oil, it's pretty black though
Thanks!
http://www.starvacuumpumps.com/products/STR.06.11.001
Which catch can did you go with? Never mind lol same one I bought. Where did you mount yours?
I am getting just oil, it's pretty black though
Thanks!
Last edited by ramair96ws6; 01-11-2013 at 10:21 PM.
01-11-2013, 10:25 PM
#139
TECH Fanatic
Thread Starter
iTrader: (32)
Join Date: Oct 2005
Location: Fairfax, Virginia
Posts: 1,687
Likes: 0
Received 0 Likes
on
0 Posts
Oh I see what you mean now. The cut out is facing downwards (towards header) so it doesn't pool up in oil. Is that how you did it?
I have a Moroso catch can. No different than yours except it's plastic.
I have a Moroso catch can. No different than yours except it's plastic.