cking894
Well-known member
Norman and I have been considering building an intake manifold for my pickup for some time. The one the criteria is that it has to be something completely different but be fully functional. We started putting the plan into action this past week. Here are some pictures and thoughts as we have been coming up with our design. Any thoughts or critique is welcome. This is a driver and we want it to run rights.
We started with 1/4" intake flanges that a friend of ours had water jetted out in Colorado. The flanges are great and fit the intake ports on the heads perfectly. I had to open up the bolt holes for the flanges because of the angle the bolts go into the heads. I put a big block Chevy rocker arm ball under each bolt that will be welded down to the flanges. The ball will maintain the right angle for the bolt and give even pressure for torquing them down.
To tie the flanges together we have welded 1/2" X 1" mild steel as a border around the intake valley. The stainless steel that is laying across the valley as pictures will be removable. It will be bolted down onto the valley frame work. Unfortunately my battery died on my phone before I could get a picture of it. I will get one later and post it.
The main portion of the intake from the flanges up are going to be constructed out of stainless steel and tig welded. I started by cutting 2" diameter stainless tube into 6" lengths and then I worked one end of them in the vise to make them rectangular to fit the intake ports. The 2" diameter works out perfectly to make the shape for the intake ports. The stainless steel holds the shape much better than mild steel also so it wasn't much work to make them fit. The 6" length is just a starting point on the height into the plenum.
We tried mocking up several designs of plenums for the intake. The taller one in the back was our first shot at one but we realized right away that it would end up being way to tall for our application. The shorter one in front was our second shot at it but we determined that it looked too bulky and the intake runners looked to small and out of proportion.
I guess I haven't mentioned it yet in the post we are planning on running five Rochester two barrel carbs on the intake. We have been collecting the 250 cfm ones at every swap meet for a while so we have a good supply of them. Norm has an eight deuce manifold for his 392 hemi that he is using them on also. Here is a picture of the layout we are going to use. The air cleaners are on there only as an idea for now on what to use.
Our plan is to run on the center carb as the primary and have them all be setup so that they are fully controllable by progressive linkage. We will probably need to use restricter plates to keep the total cfm at about 850 but we will have to try it and see.
Our third attempt at making a plenum looks about right. The intake runners would be about three inches with it and the proportions look much better. The overall height will work out just about perfect also.
After looking at it for several days we came up with another idea. Last year I picked up a WWII bomber oxygen take at a swap meet for $20.00. They are make out of stainless steel and it just so happens that my pickup has three of them in the back already. We came up with the idea of using a portion of the tank at the bottom of the plenum and possibly using a portion of it as the top to an air cleaner. Here is a picture of my pickup with the tanks in the back to give you an idea of what they look like.
We did mock up the plenum and the size and shape look good but I wasn't able to get a picture. I will next time I go up to Norms.
If any of you have any thoughts or see something we missed please speak up. We are in the planning stage and it's easy to adjust something now.
Keith
We started with 1/4" intake flanges that a friend of ours had water jetted out in Colorado. The flanges are great and fit the intake ports on the heads perfectly. I had to open up the bolt holes for the flanges because of the angle the bolts go into the heads. I put a big block Chevy rocker arm ball under each bolt that will be welded down to the flanges. The ball will maintain the right angle for the bolt and give even pressure for torquing them down.
To tie the flanges together we have welded 1/2" X 1" mild steel as a border around the intake valley. The stainless steel that is laying across the valley as pictures will be removable. It will be bolted down onto the valley frame work. Unfortunately my battery died on my phone before I could get a picture of it. I will get one later and post it.
The main portion of the intake from the flanges up are going to be constructed out of stainless steel and tig welded. I started by cutting 2" diameter stainless tube into 6" lengths and then I worked one end of them in the vise to make them rectangular to fit the intake ports. The 2" diameter works out perfectly to make the shape for the intake ports. The stainless steel holds the shape much better than mild steel also so it wasn't much work to make them fit. The 6" length is just a starting point on the height into the plenum.
We tried mocking up several designs of plenums for the intake. The taller one in the back was our first shot at one but we realized right away that it would end up being way to tall for our application. The shorter one in front was our second shot at it but we determined that it looked too bulky and the intake runners looked to small and out of proportion.
I guess I haven't mentioned it yet in the post we are planning on running five Rochester two barrel carbs on the intake. We have been collecting the 250 cfm ones at every swap meet for a while so we have a good supply of them. Norm has an eight deuce manifold for his 392 hemi that he is using them on also. Here is a picture of the layout we are going to use. The air cleaners are on there only as an idea for now on what to use.
Our plan is to run on the center carb as the primary and have them all be setup so that they are fully controllable by progressive linkage. We will probably need to use restricter plates to keep the total cfm at about 850 but we will have to try it and see.
Our third attempt at making a plenum looks about right. The intake runners would be about three inches with it and the proportions look much better. The overall height will work out just about perfect also.
After looking at it for several days we came up with another idea. Last year I picked up a WWII bomber oxygen take at a swap meet for $20.00. They are make out of stainless steel and it just so happens that my pickup has three of them in the back already. We came up with the idea of using a portion of the tank at the bottom of the plenum and possibly using a portion of it as the top to an air cleaner. Here is a picture of my pickup with the tanks in the back to give you an idea of what they look like.
We did mock up the plenum and the size and shape look good but I wasn't able to get a picture. I will next time I go up to Norms.
If any of you have any thoughts or see something we missed please speak up. We are in the planning stage and it's easy to adjust something now.
Keith