Downdraft ~ Sidedraft
#7
Old [Sch|F]ool
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Originally Posted by Hyper4mance2k
Downdraft flow more and crate a shorther runner. Therefore they usually have less low end tq, but tq and more hp up high.
But IDAs are pure racing carbs, while DCOEs are street carbs (they actually DID come from the factory on many cars in the 60's) so racers tend to use IDAs. I don't know much about IDFs except that I *think* they are downdraft versions of the DCOE.
I would imagine that putting a downdraft carb on a sidedraft manifold or vice-versa would be *hilarious* the first time the fuel pump was turned on. The carb's float bowls are like a toilet tank, with a float and valve assembly and the fuel goes out through the bottom. Now imagine a toilet on its side...
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#10
Ok, the throttle body is 50mm and I have been using a Dell 48 on my Lakes (but I do not know the venturi size) . Here are my ifs:
If the two openings of the throttle body lined up with the two openings in the Lakes.
And I used 1/4" piece of aluminum as an adapter.
Would the venturi runner ration work
If the two openings of the throttle body lined up with the two openings in the Lakes.
And I used 1/4" piece of aluminum as an adapter.
Would the venturi runner ration work
#13
Banned. I got OWNED!!!
Originally Posted by Hyper4mance2k
Dang Jeb I'm all confused on what you're trying to acomplish here. You've got IDA style FI and you want to put it on a side draft style manifold? It'll workgreat if you make a spacer of some sorts.
#15
Peejay and everyone,
I was looking at this a couple months ago and now I am back thinking about this again.
Here is what I would like to do. I would like to put my IDA type 50mm throttle body on a home build Lakes type intake manifold. (Yes, I can weld) This would make the intake runners about 6" long. Everything would still fit under the hood (unlike most IDA setups).
This intake system would go on a big street ported 13B, and I plan on using a Megasquirt controller.
My questions are:
1. can I get the right intake runner ration on this setup and can you tell me more about this.
2. have I gone way too big on the throttle body size.
3. what suggestions do you have to pull this off?
4. one last thought. I planned on tilting the intake upward a bit when I build it to keep it away from the exhaust heat. Any thoughts?
Thanks
I was looking at this a couple months ago and now I am back thinking about this again.
Here is what I would like to do. I would like to put my IDA type 50mm throttle body on a home build Lakes type intake manifold. (Yes, I can weld) This would make the intake runners about 6" long. Everything would still fit under the hood (unlike most IDA setups).
This intake system would go on a big street ported 13B, and I plan on using a Megasquirt controller.
My questions are:
1. can I get the right intake runner ration on this setup and can you tell me more about this.
2. have I gone way too big on the throttle body size.
3. what suggestions do you have to pull this off?
4. one last thought. I planned on tilting the intake upward a bit when I build it to keep it away from the exhaust heat. Any thoughts?
Thanks
#16
Can't comment on the TB, but for the intake, pick up weld ells in the diameter you need. The entire intake shouldn't be that hard to fab if you have flat stock for the flanges, hole saws of the appropriate sizes and a die grinder. You could even look at some of the custom turbo headers and wiggle the tubing to where ever you want it in the engine bay, keeping the intake runners equal length. Runner length will be a prime factor on optimization for intended rpm range.
Sounds like an interesting project, pics during the fab process, pics will be a must. I'm still looking for ideas to keep the 12A bp in the widebody, use a TII exhaust mani and turbo. MS and FI. What has stopped me was a way to develope an intake to mate a TB too.
If you are going semi Lake Cities style, heat shielding will be a given. Ceramic powdercoating on the outside might solve the heat issue a give a cleaner looking install.
Sounds like an interesting project, pics during the fab process, pics will be a must. I'm still looking for ideas to keep the 12A bp in the widebody, use a TII exhaust mani and turbo. MS and FI. What has stopped me was a way to develope an intake to mate a TB too.
If you are going semi Lake Cities style, heat shielding will be a given. Ceramic powdercoating on the outside might solve the heat issue a give a cleaner looking install.
#20
Banned. I got OWNED!!!
Originally Posted by Rx Seven
Well I think these pics are some what relevent to the style of intake you are talking about. Maybe you can get some ideas from them. I will try and find some more info on them if you want. Hope they help.
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RotaryBobby
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09-10-15 01:33 PM