Custom Intake Manifold
04-12-06, 06:15 PM
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Custom Intake Manifold
In a few months i am taking a high performance engines and chassis fabrication course at my school. I am going to be building a intake manifold and i just wanted to get some input on my first design. its simalar to a ITB's set up, but with only one large throttle body, i attached a crude ms paint diagram for people to get a better idea of the set up. Im running two pieces of tubing just after the throttle body right to peripherial ported intake ports. Anyone seen a set up such as this? Any ideas for improvement? I am running a 61mm sound performance turbo and i think a 85mm or so throttle body should be sufficient, anyone think other wise? Any in input would be great! thanks! Damn, i cant shrink the ms paint diagram down enough to post it, if anyone is interested in seeing exactly what im talking about ill draw it out and photograph it.
04-13-06, 11:48 AM
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04-13-06, 12:10 PM
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I know there is a lot of benefit to be had with aftermarket intake manifolds on a piston engine. You can get like 20+ HP just by changing the intake manifold on some 4 cylinder engines, I've seen dyno proof.
On a rotary it's different though. The power curve is a lot different. If you put a short running intake on a rotary you might kill your bottom end, but gain top end only. It seems that you would have to very carefuly plan it because the rotary is such a dynamic engine.
On a rotary it's different though. The power curve is a lot different. If you put a short running intake on a rotary you might kill your bottom end, but gain top end only. It seems that you would have to very carefuly plan it because the rotary is such a dynamic engine.
04-13-06, 12:34 PM
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eastcoast.. don't copy this.. flow to 1 & 4 runner will be poor , flow dynamics into all the ports to the runners is poor without a smooth transition into the runner you will end up with a huge boundry layer, reducing the internal diameter of the runner by a considerable percentage. Adding a bell mouth or some form of smoothing of the transition point for improved laminar flow in the runner
Originally Posted by Aaron Cake
04-13-06, 01:37 PM
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Yes, as I mentioned in the thread it would be nice to have a longer plenum and small velocity stacks. That would take care of any turbulence around the inlets of the runners.
Physical space in the engine bay limited the plenum size though.
Physical space in the engine bay limited the plenum size though.
04-13-06, 01:44 PM
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that's odd, mine worked out just fine with a smoothed transition internally to the plenum, a well volumed Plenum and tuned lenght runners.. with loads of room to work with room above, below and on both sides of the intake manifold
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04-13-06, 04:29 PM
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Post the pictures...Unless you are actually trying to sell your products as part of a business on this forum then you're not a vendor and there's no problem with posting something your shop has done...
If the rear end of my plenum was expanded beyond what it currently is, then there would not be any more room for the vacuum nipples or temp sensor. Of course those could just be relocated but that didn't occurr to me at the time. A much better spot would have been on the throttle mounting area.
That's likely what I'll be doing on the next one. The little velocity stacks are fairly easy to make as well with a press and a mandrel (or a big vice!). The intake shown in the thread above was a prototype and what I learned from that will go into the next one. Also direct flow bench comparisons between the prototype, stock and improved intakes...
If the rear end of my plenum was expanded beyond what it currently is, then there would not be any more room for the vacuum nipples or temp sensor. Of course those could just be relocated but that didn't occurr to me at the time. A much better spot would have been on the throttle mounting area.
That's likely what I'll be doing on the next one. The little velocity stacks are fairly easy to make as well with a press and a mandrel (or a big vice!). The intake shown in the thread above was a prototype and what I learned from that will go into the next one. Also direct flow bench comparisons between the prototype, stock and improved intakes...
04-13-06, 04:37 PM
#11
Originally Posted by doridori-rx7
eastcoast.. don't copy this.. flow to 1 & 4 runner will be poor , flow dynamics into all the ports to the runners is poor without a smooth transition into the runner you will end up with a huge boundry layer, reducing the internal diameter of the runner by a considerable percentage. Adding a bell mouth or some form of smoothing of the transition point for improved laminar flow in the runner
