Aftermarket Intake Manifolds?
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Aftermarket Intake Manifolds?
Are there any companies or individuals that makes intake manifolds for 13BT?
Seems like the IM is the biggest bottle neck for 2nd gen 13BTs, especially the S4.
Jay Kim
Seems like the IM is the biggest bottle neck for 2nd gen 13BTs, especially the S4.
Jay Kim
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The biggest bottleneck for the engine are the ports. Intake is not really an issue.
There are many NA aftermarket intakes in the form of carb (don't go there) based kits, and the IDA style dual throttle body intake. Many of then are suitable for race only.
There are many NA aftermarket intakes in the form of carb (don't go there) based kits, and the IDA style dual throttle body intake. Many of then are suitable for race only.
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Re: Aftermarket Intake Manifolds?
Originally posted by kim307
Are there any companies or individuals that makes intake manifolds for 13BT?
Seems like the IM is the biggest bottle neck for 2nd gen 13BTs, especially the S4.
Jay Kim
Are there any companies or individuals that makes intake manifolds for 13BT?
Seems like the IM is the biggest bottle neck for 2nd gen 13BTs, especially the S4.
Jay Kim
BTW - Jay Tech also "used" to make AWESOME manifolds, etc.
Last edited by KNONFS; 10-18-03 at 09:53 AM.
#5
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Originally posted by Aaron Cake
The biggest bottleneck for the engine are the ports. Intake is not really an issue.
There are many NA aftermarket intakes in the form of carb (don't go there) based kits, and the IDA style dual throttle body intake. Many of then are suitable for race only.
The biggest bottleneck for the engine are the ports. Intake is not really an issue.
There are many NA aftermarket intakes in the form of carb (don't go there) based kits, and the IDA style dual throttle body intake. Many of then are suitable for race only.
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Originally posted by Aaron Cake
The biggest bottleneck for the engine are the ports. Intake is not really an issue.
There are many NA aftermarket intakes in the form of carb (don't go there) based kits, and the IDA style dual throttle body intake. Many of then are suitable for race only.
The biggest bottleneck for the engine are the ports. Intake is not really an issue.
There are many NA aftermarket intakes in the form of carb (don't go there) based kits, and the IDA style dual throttle body intake. Many of then are suitable for race only.
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#8
There are plenty of people that make aftermarket intake manifolds the 13bt motors but you need to look to the land down under (Australia). I can probably dig up some pics with some links if you are really interested.
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Originally posted by mazdaspeed7
What do you have to back that up?
What do you have to back that up?
you can drive them on the street, but cold starts and such become a pain, amongst other little details.
If you're really concerned with the intake manifold sizing. Then port it out, or get it extrude honed.
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I love those aftermarket fuel injection throttle body designs. You can pick up manifold/throttle body sets off of EBay for like $500. That is where I am getting mine from. They are Australian folks.
#11
mad scientist
Originally posted by fastrotaries
EXPERIENCE!
you can drive them on the street, but cold starts and such become a pain, amongst other little details.
If you're really concerned with the intake manifold sizing. Then port it out, or get it extrude honed.
EXPERIENCE!
you can drive them on the street, but cold starts and such become a pain, amongst other little details.
If you're really concerned with the intake manifold sizing. Then port it out, or get it extrude honed.
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What I mean is that before you start looking at replacing a (very well designed) intake manifold, you should look at porting the engine so you can actually benefit from the intake swap. Sure, changing the intake on a stock port car will obviously result in some power gain, but without the porting, it will be less then optimal (and thus, for the price and PITA factor, probably not worth it).
For the record, I don't hate carbs. I just believe that fuel injection has so many advantages over carb setups that I wouldn't even consider swapping "backwards" from EFI to carb. Even mechanical fuel injection (ie. Bosch K Jetronic) is superior in many ways.
For the record, I don't hate carbs. I just believe that fuel injection has so many advantages over carb setups that I wouldn't even consider swapping "backwards" from EFI to carb. Even mechanical fuel injection (ie. Bosch K Jetronic) is superior in many ways.
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For those who missed it, the question was about manifolds for the 13BT, not the 6-port NA.
Nobody makes complete custom intake manifolds. What the Aussies often do is assemble one using a Weber manifold, an IDA throttle body and a custom-made barrel plenum.
There's no reason why anyone couldn't do that without buying from Australia. The only custom part is the plenum.
And to back up Aaron, I've seen 500hp FC 13BT's using the stock manifold and TB bolted to a ported engine.
Nobody makes complete custom intake manifolds. What the Aussies often do is assemble one using a Weber manifold, an IDA throttle body and a custom-made barrel plenum.
There's no reason why anyone couldn't do that without buying from Australia. The only custom part is the plenum.
And to back up Aaron, I've seen 500hp FC 13BT's using the stock manifold and TB bolted to a ported engine.
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I've known about the carb'd setups for a while, but I would like this to be a step forward for my 7 not a step backward. I mean that in both performance, gas mileage and technology.
What makes RX-7 so much more complicated than, let's say....a Honda Prelude or Acura GSR intake manifold with dual runner lengths and aux ports, just like 6-port n/a?
Is there a reason why a simple, well-thought-out, sheet metal, log style manifold won't work on rotaries?
Jay Kim
What makes RX-7 so much more complicated than, let's say....a Honda Prelude or Acura GSR intake manifold with dual runner lengths and aux ports, just like 6-port n/a?
Is there a reason why a simple, well-thought-out, sheet metal, log style manifold won't work on rotaries?
Jay Kim
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The reason no-one makes then has got nothing to do with the fact that it's a rotary, it's simply that the demand is not there for mass-production like there is with Honda manifolds.
There's no reason you can't make your own, but remember that inlet manifold design is not as simple as it looks. It's quite easy to go backwards in performance if you stuff it up.
There's no reason you can't make your own, but remember that inlet manifold design is not as simple as it looks. It's quite easy to go backwards in performance if you stuff it up.
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Originally posted by NZConvertible
The reason no-one makes then has got nothing to do with the fact that it's a rotary, it's simply that the demand is not there for mass-production like there is with Honda manifolds.
There's no reason you can't make your own, but remember that inlet manifold design is not as simple as it looks. It's quite easy to go backwards in performance if you stuff it up.
The reason no-one makes then has got nothing to do with the fact that it's a rotary, it's simply that the demand is not there for mass-production like there is with Honda manifolds.
There's no reason you can't make your own, but remember that inlet manifold design is not as simple as it looks. It's quite easy to go backwards in performance if you stuff it up.
Another question...are the bolt patterns the same for the intake manifolds for 13BT and 13B-REW?
Jay Kim
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$750 for a IM? Wow that's expensive.
Are there any other companies that are proven to make power down there in AU? And maybe a little cheaper?
Jay Kim
Are there any other companies that are proven to make power down there in AU? And maybe a little cheaper?
Jay Kim
Last edited by kim307; 10-19-03 at 03:13 AM.
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Originally posted by kim307
$750 for a IM? Wow that's expensive.
Are there any other companies that are proven to make power down there in AU? And maybe a little cheaper?
Jay Kim
$750 for a IM? Wow that's expensive.
Are there any other companies that are proven to make power down there in AU? And maybe a little cheaper?
Jay Kim
You may sacrifice a little in drivability though. you are talking about 2 throttle plates that feed all four ports at the same time, it will not be progressive like a carb that has primaries and secondaries(although this effect is really only drastic on 6 port engines).
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Originally posted by kim307
...are the bolt patterns the same for the intake manifolds for 13BT and 13B-REW?
...are the bolt patterns the same for the intake manifolds for 13BT and 13B-REW?
Originally posted by RoninAutoBoX
...it will not be progressive like a carb that has primaries and secondaries
...it will not be progressive like a carb that has primaries and secondaries
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If I were to have a product similar to the one by RotorX and sell it for $300-400 would there be enough interest?
Of course that's only if these RotorX things prove their worthiness on a flow bench.
I wonder if RotorX had them flowtested and even better, sonic tested.
Jay Kim
Of course that's only if these RotorX things prove their worthiness on a flow bench.
I wonder if RotorX had them flowtested and even better, sonic tested.
Jay Kim
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I think the testing is what is holding alot of people back. Sure I could go into my garage and fabricate a log style plenum and make it look really cool. But will it flow properly, let alone as good or better than a stock manifold.
Once you've made this manifold, who is going to flow test it. By the time all the testing and dyno time has been done, you have to selli t for 700 just to cover all the research costs.
Once you've made this manifold, who is going to flow test it. By the time all the testing and dyno time has been done, you have to selli t for 700 just to cover all the research costs.
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Originally posted by kim307
Of course that's only if these RotorX things prove their worthiness on a flow bench.
Of course that's only if these RotorX things prove their worthiness on a flow bench.
BTW, that plenum is A$745, or US$514. Loose the chrome and it's probably cheaper.