greenfoam
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Ok here we go,
First of all this manifold is a bit/alot of a compromise, I would much rather have a split manifold with looong 10 15 or even 20 inch runners hanging out over each rocker cover with a throttle body on each plenum, then My VN would be straight in the 14 second bracket with no other modifications but that's a big job.
So since a proper tuned manifold like that is hard to come by, I thought might as well try a simple divider first, worst case is I'll gain some low speed torque and loose a bit on the top end and if It doesn't make alot of difference I'll cut the whole top off the manifold and start making that proper tuned design I talked about at first : ).
Ok here's how to make a divided manifold
Picture 1.
This is the aftermath of me going sick with a common angle grinder with a thin cutoff wheel attached, I cut straight along the top of the manifold and down the front as far as I could go without cutting into the base of the manifold. (be careful and use your glasses) also use a can of spray on canola cooking oil to help cut alloy : ) helps with die grinding the stuff anyway.
Picture 2.
Same thing from the back.
Picture 3.
This is the bit of cardboard I used for a template, bit of scissor work to get it just right but this goes with the manifold to the engineers (today) so he can cut a sheet of aluminium the same size and weld the manifold back together for me
Picture 4.
Template installed.
Picture 5.
Again from the front.
Also I will be making a divider for the bend so it's divided all the way up the the throttle body just to see what effect that has. With and without it. (I saw an aftermarket mustang manifold like that and it made lots more power)
That's it : ) now I just need to get it welded up and some gaskets, I hope to have it on the car on the weekend or if not then sometime next week. I've also done some porting in the runners around where the injector plugs in because there was some nasty over engineering there so I got rid of some of the casting. The saga will continue later : )
First of all this manifold is a bit/alot of a compromise, I would much rather have a split manifold with looong 10 15 or even 20 inch runners hanging out over each rocker cover with a throttle body on each plenum, then My VN would be straight in the 14 second bracket with no other modifications but that's a big job.
So since a proper tuned manifold like that is hard to come by, I thought might as well try a simple divider first, worst case is I'll gain some low speed torque and loose a bit on the top end and if It doesn't make alot of difference I'll cut the whole top off the manifold and start making that proper tuned design I talked about at first : ).
Ok here's how to make a divided manifold
Picture 1.
This is the aftermath of me going sick with a common angle grinder with a thin cutoff wheel attached, I cut straight along the top of the manifold and down the front as far as I could go without cutting into the base of the manifold. (be careful and use your glasses) also use a can of spray on canola cooking oil to help cut alloy : ) helps with die grinding the stuff anyway.
Picture 2.
Same thing from the back.
Picture 3.
This is the bit of cardboard I used for a template, bit of scissor work to get it just right but this goes with the manifold to the engineers (today) so he can cut a sheet of aluminium the same size and weld the manifold back together for me
Picture 4.
Template installed.
Picture 5.
Again from the front.
Also I will be making a divider for the bend so it's divided all the way up the the throttle body just to see what effect that has. With and without it. (I saw an aftermarket mustang manifold like that and it made lots more power)
That's it : ) now I just need to get it welded up and some gaskets, I hope to have it on the car on the weekend or if not then sometime next week. I've also done some porting in the runners around where the injector plugs in because there was some nasty over engineering there so I got rid of some of the casting. The saga will continue later : )
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