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Old 08-11-2009, 04:57 PM   #81
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There's the issue with backpressure, though I guess pulling a constant vacuum on a chamber with enough volume would "fill" on each cylinder.

Yeah - I was thinking 7,000 rpm equivalent. 10,000 he'd need shim under bucket. :-) I'd love to know when one needs that since... my bottom end can handle it and I'd like to not trash the head.
if you've got enough flow capacity for an improved intake manifold, you'd presumably want to use that capacity, no?
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Old 08-11-2009, 08:22 PM   #82
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Estimated plenum volume is going to be 4Liters so I don't think anyone is going to run into a lack of volume for high rpm, or big boost... I received the 1.6L intake manifold and things look very promising for coming up with something that will produce ALOT more power.

I have some questions that need to be determined by the majority rule now,
What throttle body should this be standard to use, also how bolt on does this need to be?

The way I typically make intake manifolds is to use a more or less universal throttle body bolt pattern being the ford which allows for a large selection of throttle bodies to be ran, after that is said I don't typically put factory iacv and stuff like that on the plenums, I just have 4 1/4" npt fittings at the end cap and allow people to run those to what they need.

My goal here is not to satisfy 1 single person but instead the majority of people as I have learned that business is best ran by covering a group rather than a select few.

So now it is time for the suggestions to pure in...

Also any houston guys please get in contact with me as when I have a finished piece I would love to do so dyno testing before I release it, as stated before I get 24/7 dyno access from my best friends shop and he just so happens to be well known for tuning 800+ hp cars so I am sure he can handle the job.

-James
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Old 08-11-2009, 08:28 PM   #83
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IIRC 70 mm Mustang throttle bodies seem to be the favorite. I wouldn't worry to much about a IAC. If you can't find anyone local to dyno ID be more then happy to bolt one on and run to the dyno. I just dyno'd a month ago and don't plan to make any changes until I get a new intake mani.
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Old 08-11-2009, 08:48 PM   #84
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I noticed there is a passage on the head flange, it looks like a water port, is this something I can block off (I am assuming it is throttle body heater)?

Also how high rpm do the 1.6L rev to? This will determine runner lengths.
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Old 08-11-2009, 08:53 PM   #85
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I noticed there is a passage on the head flange, it looks like a water port, is this something I can block off (I am assuming it is throttle body heater)?

Also how high rpm do the 1.6L rev to? This will determine runner lengths.
Yeah you can block that port off, Most of us guys do. 7200 rpm is the rev limiter.
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Old 08-11-2009, 08:56 PM   #86
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When you come up with Miata intake drawings id suggest starting a new thread in the engine section so there less to scroll through.
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Old 08-11-2009, 09:05 PM   #87
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Ok

More questions..

Where do you want the manifold tuned to?
Low RPM
Mid Range
High RPM?

Do yall want a bracket to hold the throttle cable or no?

Obviously the less of these little nitpicky things the quicker the construction and the lesser the price. I just need to know if people would be happy with the barest minimum or will I need to include everything including a set of instructions?
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Old 08-11-2009, 09:11 PM   #88
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Quote:
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Ok

More questions..

Where do you want the manifold tuned to?
Low RPM
Mid Range
High RPM?

Do yall want a bracket to hold the throttle cable or no?

Obviously the less of these little nitpicky things the quicker the construction and the lesser the price. I just need to know if people would be happy with the barest minimum or will I need to include everything including a set of instructions?

All of the above if possible, but mid to high since most of us do suffer from serious torque drops up top with stock intake manifolds. Yes, we definitely would want a bracket for the throttle cable. If anyone needs instructions they need to start taking the bus.
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Old 08-11-2009, 09:19 PM   #89
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Well you never know, on the instructions thing lol I have had some pretty crazy phone calls on how to do the simplest of things.

I will go ahead and do the throttle bracket.

By the way you said the powerband drops on the high end it sounds like I should try to help out there the most so I will keep things in the mid-high end range for post part.
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Old 08-11-2009, 09:20 PM   #90
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You might find some folks would prefer the IAC - though isn't that built into any of the throttle bodies?

Also, not saying you shouldn't make a 1.6 version, but the 1.8 version would support 10 years of car, the 1.6 only a couple. If I were in it MERELY to sell as many units as possible, that's what I'd make.

Then again, selfishly, I'd say practice on the 1.6 and when you have it down make a 1.8 version. :-)
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Old 08-11-2009, 09:21 PM   #91
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Ohh got a important one here,

What is the distnace between the intake valve seat and the port flange surface?

This is calculated into the overall primary length and to get things accurate I need an accurate measurement here as well.
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Old 08-11-2009, 09:27 PM   #92
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As to injectors what do yall want here?

Factory style injectors or bosch style are the options.

If factory style is preferred I will need to get hold a 1 injector for pulling measurements.

-James
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Old 08-11-2009, 09:29 PM   #93
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Just putting it out there, the lancer evo injectors are both very cheap and readily available (550 or more cc take offs) and work well... And are compatible with the miata stockers. So I'd vote for that.
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Old 08-11-2009, 09:36 PM   #94
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Quote:
Originally Posted by BMCRace View Post
Ohh got a important one here,

What is the distnace between the intake valve seat and the port flange surface?

This is calculated into the overall primary length and to get things accurate I need an accurate measurement here as well.

I have a head at the shop I can measure on for you tomorrow. Call me when you get in, you should have my number in your email.
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Old 08-11-2009, 09:39 PM   #95
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Originally Posted by BMCRace View Post
As to injectors what do yall want here?

Factory style injectors or bosch style are the options.

If factory style is preferred I will need to get hold a 1 injector for pulling measurements.

-James

Stock injector, I can send you one tomorrow.
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Old 08-11-2009, 09:40 PM   #96
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Quote:
Originally Posted by AbeFM View Post
You might find some folks would prefer the IAC - though isn't that built into any of the throttle bodies?

Also, not saying you shouldn't make a 1.6 version, but the 1.8 version would support 10 years of car, the 1.6 only a couple. If I were in it MERELY to sell as many units as possible, that's what I'd make.

Then again, selfishly, I'd say practice on the 1.6 and when you have it down make a 1.8 version. :-)

If someone wants to send him a 1.8 mani I'm sure he'd make it.
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Old 08-11-2009, 10:57 PM   #97
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I would prefer either sticking to stack miata or bosch type instead of mixing in other injectors.

I have your number I am at home right now I will call you tomorrow from the shop.
I dont really need the head itself just the measurement, however if port sizing on the head is very different from the manifold then it might not hurt for me to measure off the head because that is what it is important that we match the ports to. However if most people like to resize the stock ports I would need some idea of what to size the ports to so that we can machine them to that instead.
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Old 08-11-2009, 10:59 PM   #98
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sti injectors are the best for low budget setups, the honda guys take them from their factory form (550cc) and cut the nozzles and boom they are 900cc lol

Some ghetto honda fab there for yo! lol
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Old 08-11-2009, 11:08 PM   #99
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ok, stock injectors is best.
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Old 08-12-2009, 02:48 AM   #100
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Huh. Well, there's a guy on here who wants one of my spare mani's to try gutting. But I could send it, with or without stock injectors, if you cover shipping. :-) I will someday be in the market for an upgraded mani, but not yet. If you get serious about 1.8's let me know.
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