Team Camaro Tech banner
21 - 40 of 67 Posts

Premium Member
Joined
2,130 Posts
Discussion Starter · #21 ·
I just went through this same exact thing. Concept 1 pulley system using an Eldebrock pump.
Post#27
I even posted in this thread, lol. Shows how bad my memory is. SO......Have you put it back together and tested it out at all? What is your current resolution?
I have two solutions;
1-Take out the 1" spacer. Monitor the engine temp and evaluate whether the change in fan location causes temperature change. My A/C clutch is thinner than yours, so I think I can remove the spacer and not hit my A/C compressor with the fan blades.
2-Trying to contact Stewart to see if they have a Stage 3 reverse-flow BBC short water pump. Their Stage 3 has a larger shaft per their website so I'm thinking it would better withstand any further out leverage forces.

I will be calling Stewart today as they did not reply to my email.

Will update as needed,
Brett....
 

Registered
Joined
1,578 Posts
I even posted in this thread, lol. Shows how bad my memory is. SO......Have you put it back together and tested it out at all? What is your current resolution?
I have two solutions;
1-Take out the 1" spacer. Monitor the engine temp and evaluate whether the change in fan location causes temperature change. My A/C clutch is thinner than yours, so I think I can remove the spacer and not hit my A/C compressor with the fan blades.
2-Trying to contact Stewart to see if they have a Stage 3 reverse-flow BBC short water pump. Their Stage 3 has a larger shaft per their website so I'm thinking it would better withstand any further out leverage forces.

I will be calling Stewart today as they did not reply to my email.

Will update as needed,
Brett....
Yes, it's all back together. I had to keep the spacer and put everything back as it was. I'm driving it and hoping for the best. So far so good.
I'd like to know more about the pumps with the bigger shaft.
 

Premium Member
Joined
2,130 Posts
Discussion Starter · #23 ·
Okay, I'll post when I find out. They are on East Coast Time so I've been too late on the call. Hopefully tomorrow I'll catch them there.
I received my replacement CVF pump. I am contemplating no spacer. I need to be patient, lol.
Brett.....
 
  • Like
Reactions: Just 1 More

Registered
Joined
1,578 Posts
I'd like to know more about the "Fan hub set screw for positive positioning" and how that works
 

Premium Member
Joined
901 Posts
Around here FedEx is the worst, I request the USPS over FedEx now-a-days. Last week I had to do a 4 wheel brake job on my grandsons car. UPS guy pulled up and hung around and even helped me with the reline for a while.
When it comes to cross-border shipments, UPS call themselves brown for a reason:poop: Fedex is best here.
 

Premium Member
68 Camaro SS/RS, 454 BB 4 speed, 3.73 Posi, new paint, motor mods , trans and diff assembly. 2" Drop
Joined
524 Posts
International shipments:DHL rules. Ordered a motorcycle helmet from Italy 馃嚠馃嚬 At my door in 2 days with standard shipping. Glad F..kEx works fir you, The post office is faster. I specifically request do not use Fed ex.
 

Premium Member
Joined
901 Posts
International shipments:DHL rules. Ordered a motorcycle helmet from Italy 馃嚠馃嚬 At my door in 2 days with standard shipping. Glad F..kEx works fir you, The post office is faster. I specifically request do not use Fed ex.
I've used DHL and they are probably best for shipments from oversea's.
With US / Can border, UPS nails you hard for customs and brokerage fees and that invoice comes a month or more after the shipment is received. Fedex can be good if the shipper has a sweet deal with them. Funny how the same company can either suck or be good depending on the area.
 

Premium Member
Joined
2,130 Posts
Discussion Starter · #28 ·
I'd like to know more about the "Fan hub set screw for positive positioning" and how that works
I called and talked to the Stewart owner today. He said he cannot make a Stage 3 Reverse Flow BBC Short Water Pump, but he can make a Stage 4 Pump with CCW, reverse flow pump. This pump has a billet machined impeller, 3/4 shaft and heavy duty bearings and that "Fan hub set screw for positive positioning". I knew it was more money. I think he said $328 or there abouts.
But, I have a new pump, with a new spacer that has 8 total bolt-down holes and so does the new pump. I'm tempted to go back together with what I have. I am also considering the machine shop that is currently balancing my rotating assembly for my 427 and asking him if he can balance a 7 blade fan. Ya think? Then again, I might call Stewart up and order the Stage 4. I'm unsure.
Brett.....
 
  • Like
Reactions: Just 1 More

Registered
Joined
1,578 Posts
I called and talked to the Stewart owner today. He said he cannot make a Stage 3 Reverse Flow BBC Short Water Pump, but he can make a Stage 4 Pump with CCW, reverse flow pump. This pump has a billet machined impeller, 3/4 shaft and heavy duty bearings and that "Fan hub set screw for positive positioning". I knew it was more money. I think he said $328 or there abouts.
But, I have a new pump, with a new spacer that has 8 total bolt-down holes and so does the new pump. I'm tempted to go back together with what I have. I am also considering the machine shop that is currently balancing my rotating assembly for my 427 and asking him if he can balance a 7 blade fan. Ya think? Then again, I might call Stewart up and order the Stage 4. I'm unsure.
Brett.....
The Eldebrock pumps are in that price range so I wouldn't consider it out of line.
 

Registered
Joined
911 Posts
Just get the the standard Stewart pump. They are plenty heavy duty.
 

Premium Member
Joined
2,130 Posts
Discussion Starter · #31 ·
Okay, I purchased the Stage 4 Reverse-Flow Stewart Pump. I asked him if I would be okay hanging out a 1" spacer with a stock 7-blade clutch fan and he said he would not recommend it on the Stage 1 or 2. Stage 4 is okay. I asked him about the "Fan Hub Set Screw for positive stop". He said it is a redundant securing mechanism along with a press-fit hub, so it is inside the water pump.
Brett....
 
  • Like
Reactions: Just 1 More

Registered
Joined
1,578 Posts
Okay, I purchased the Stage 4 Reverse-Flow Stewart Pump. I asked him if I would be okay hanging out a 1" spacer with a stock 7-blade clutch fan and he said he would not recommend it on the Stage 1 or 2. Stage 4 is okay. I asked him about the "Fan Hub Set Screw for positive stop". He said it is a redundant securing mechanism along with a press-fit hub, so it is inside the water pump.
Brett....
Let's see it when you get it.. lots of pics all angles.. even maybe get a playboy model to hold it... lol
 

Premium Member
Joined
2,130 Posts
Discussion Starter · #33 ·
You got it! :geek:
 

Premium Member
68 Camaro SS/RS, 454 BB 4 speed, 3.73 Posi, new paint, motor mods , trans and diff assembly. 2" Drop
Joined
524 Posts
How does reverse flow set up work? Is it where you have to run an idler bc the pump will be turning the opposite way? So the coolant still enters the rad from the top and exits the bottom right?
 

Premium Member
Joined
2,130 Posts
Discussion Starter · #35 ·
StevieBB54, You bring up a good point. I have been calling it a "Reverse Flow", but in reality it is a "Reverse Rotation". The flow is the same, but the impeller vanes are reversed in order to have the flow go the same way with the impeller rotating in the opposite direction. Yes, since you only have one belt, and you have to go around all accessories, the belt around the water pump winds up routing like in the picture below. Both the fan blades and the clutch have to be different because they are rotating counter clock-wise. In the picture below, you can see aluminum rubbing off of the pulley and onto the belt. For that reason, I had the pulley Hard Anodized.

Automotive tire Metalworking Machine tool Motor vehicle Rim


I just noticed in this picture, the fan is less than one inch from the A/C compressor. That totally throws out my option of running without a spacer. Crap! Now I have to run a spacer.
The first spacer below has no support for when the bolts go through it. So the bottom spacer is what I purchased. It has holes rather than huge slots as clearance. The spacer and the fan both have locating sleeves, so the spacer might be irrelevant.

Wood Soil Metal Fashion accessory Jewellery



Automotive tire Audio equipment Cylinder Gas Rim


Brett 馃殌 馃殌 馃殌
 

Registered
Joined
1,578 Posts
I used a March Pulleys 1" spacer and it's a solid spacer with very specific drilled holes
 

Premium Member
68 Camaro SS/RS, 454 BB 4 speed, 3.73 Posi, new paint, motor mods , trans and diff assembly. 2" Drop
Joined
524 Posts
Thanks for the explanation. FWIW my fan blade is less than an 1/8鈥 from the alternator pulley cover. I used the compact Hayden which eliminated the spacer for me. Im now calculating an aluminum radiator with electric fans. What a chore this is becoming.
 

Registered
Camaro 1968, going along with a propane powered BPE 383 ci, T56, Eaton Posi 4.10:1, MCB Big Brakes
Joined
865 Posts
Very interesting reading...
I read all as well and am definitely considering a Steward pump as well! Better now than risk a damage. I also have CVF system on a SBC and I could use :
"Part number is EMP-13403."

It really is a strange world we live in. Low cost is everywhere. At the end it just cost more, I hate that.
For me, changing this pump is going to cost 2X your price now (parts to ship international + Europe entrance fees and VAT).

I don't have your experience to see directly that the CVF pump is not a good pump to be used.

I guess it also depends on your torque and RPM use?
What do you think CVF pump can safely handle?
 

Premium Member
Joined
2,130 Posts
Discussion Starter · #39 ·
Marc, I don't think it is HP/Torque related. I think it is the weight of the OE fan with clutch And a 1" spacer that causes the weight of the fan to be farther out away from the pump. If you don't have the heavy OE clutch fan or if you don't have a 1" spacer on your setup, I think the water pump that came in the CVF kit should hold up.
I don't remember where I read it, but I think there was a pump I saw somewhere that had in the fine print; "Fan spacer not recommended".
Brett....
 

Registered
Camaro 1968, going along with a propane powered BPE 383 ci, T56, Eaton Posi 4.10:1, MCB Big Brakes
Joined
865 Posts
Hi Brett,
Well I have the same fan and clutch and spacer you have. Maybe I'll use a shorter spacer but this is not sure I can make this fit... RIght now the engine is still not in the car as I added my self more work to the body and the interior, so it is still easier to add the right pump with engine on the stand...
So reading you I guess I'd better buy a Steward pump?
EMP-13403 is a short style water pump and I see this is the same for the CVF raptor kit...
Do you confirm this pump is the one I need?
It is a stage 1 pump.
Engine is 383 ci 430 advertised power. Thanks,
 
21 - 40 of 67 Posts
Top