Honda intake manifold
07-10-2012, 01:03 PM
#542
*** ok, I don't think its for an S2000. Not sure what its for actually. But how are you going to block off that port on top? I've been trying to find a throttle body with an IAC valve on the Throttle from a honda to use, it would be nice to go to electronic idle control vs a screw. But for now I use the screw and it works alright.
Last edited by chance91; 07-10-2012 at 01:24 PM.
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07-10-2012, 03:00 PM
#546
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Paul did back to back testing. and Saint_foo copied the setup.
This is paul's stock 99 motor with stock TB and IM vs. 70mm TB and BEGI Cast IM
this compares pauls to a 97 block with 99 head and the same components.
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12-20-2012, 04:26 PM
#555
I went about it a little diffrent than it is commonly done.
The common way is to cut the flange with a few inches of runners, then cut the flange off the honda intake and weld the runners together.
Well it is common knowlage, the longer runner is good for upper RPM HP and shorter runners is better for low end torque.
The factory Mazda intake has a fairly long runner, and the aftermarket Honda is long also, so why make it even longer?
So to help keep some torque, and shorten the runner a bit, I had a flange made that fits the Mazda.
Then it is as simple as cutting off the Honda flange.
Then welding the new water jet cut Mazda flange onto the Honda intake
The runner spacing is close between the Mazda and the Hinda.
A little porting will be needed to smooth things out.
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12-20-2012, 04:39 PM
#556
But again, it's something that nobody (at least publicly) has empirically tested with the BP motor. I'm sure resonances with the valves opening and closing has some effect also, but again without someone really doing any good testing on it, we can only guess.
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12-20-2012, 04:48 PM
#559
Runner diameter factors into the wave speed, but normally you just size it to support your horse power requirements. And taper, you want it, but that gets into the realm of the voodoo magic and needing a computer to calculate. The wave math, and the HP math you can reasonably do out by hand, it would suck to have to iterate but you could do it. Beyond that you need computer simulation, or empirical testing. There some guidelines I used to know but can't remember what they were or exactly where they came from.
Before you ask, plenums... make a variable size one between 0.5 and 3 times the engine displacement and test it on the dyno. Go with the smallest one that doesn't loose power and see if that size yields acceptable throttle response.
Before you ask, plenums... make a variable size one between 0.5 and 3 times the engine displacement and test it on the dyno. Go with the smallest one that doesn't loose power and see if that size yields acceptable throttle response.
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12-20-2012, 05:10 PM
#560
Actually, from what I remember reading in this thread, it is NOT common knowledge (runner length isn't as simple as short vs long, there are lots of variables that go into it). And the non-scientific general consensus is the opposite. Short runners = less restriction = better flow at high RPM, whereas long runners = more restriction at high RPM, but better low end due to the higher intake velocity.
But again, it's something that nobody (at least publicly) has empirically tested with the BP motor. I'm sure resonances with the valves opening and closing has some effect also, but again without someone really doing any good testing on it, we can only guess.
But again, it's something that nobody (at least publicly) has empirically tested with the BP motor. I'm sure resonances with the valves opening and closing has some effect also, but again without someone really doing any good testing on it, we can only guess.
That is just a general rule of thumb.
I will dissagree that a short runner is for upper rpm, and long for torque...
Unless the intake engeneers for Edelbrock all these years have been wrong....
Look at one of the most common engeins ever... The SBC Small Block Chevy
Yes I know the Mazda BP is a 4 cylinder and the SBC is a V8, both have the same four strojes and the same 5 events.
Look at a tunnel ram intake, super long runners for small blocks twisting 8000rpm
Then look at the Torquer intakes, very short runners....
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