3d printed intake for N/A NA miatas
#81
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Well that shorter intake fits but not well and it won't do the turn towards the throttle body for alminum radiators. I made another design that should work.
Black ABS with acetone vapor polish looks pretty sweet:
Also, I now have an extremely large collection of elbows and bits of plastic crap.
Black ABS with acetone vapor polish looks pretty sweet:
Also, I now have an extremely large collection of elbows and bits of plastic crap.
#83
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I haven't had any issues driving in the rain so far- the filter is fairly high up. If you happen to have the plastic undertray off of the car it is very easy to get the filter on. I have put it on and removed it probably a dozen times now and if I don't have the tray off I just make sure I get the car up a little higher so the angle is better.
Also, attach the filter to the duct before attaching the duct to anything else. Also, don't press down on the duct too hard to avoid cracking it. Some amount of gentle pressure and twisting back and forth works best. On the newest couple of designs I made the fit not quite as tight so slipping it on takes less effort.
Also, attach the filter to the duct before attaching the duct to anything else. Also, don't press down on the duct too hard to avoid cracking it. Some amount of gentle pressure and twisting back and forth works best. On the newest couple of designs I made the fit not quite as tight so slipping it on takes less effort.
Last edited by asmasm; 03-27-2014 at 07:16 PM.
#84
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I have a megasquirt installed so I can log IAT and compare to ambient. Yesterday I went for a 30 minute drive on a 35mph commercial road with lots of stop lights in 93 degree weather. I saw a peak IAT of 106 degrees. I think I am getting some heat soak in my sensor since higher RPMs are cooling my intake temp. Here is how I have it mounted:
Does anyone have a an opinion on this being radiant heat from the radiator end tank and engine block vs heat being conducted through the heater hoses? The silicone elbows ought to insulate the aluminum section from conduction- right? I want to try some kind of heat shielding around the short section of crossover tube and see if it helps. Also, I think IATs will be better on cars with metal style radiators where the intake duct isn't making any direct contact with the end tank.
A 13 degree delta from ambient to intake in 93 degree weather seems pretty good to me
Does anyone have a an opinion on this being radiant heat from the radiator end tank and engine block vs heat being conducted through the heater hoses? The silicone elbows ought to insulate the aluminum section from conduction- right? I want to try some kind of heat shielding around the short section of crossover tube and see if it helps. Also, I think IATs will be better on cars with metal style radiators where the intake duct isn't making any direct contact with the end tank.
A 13 degree delta from ambient to intake in 93 degree weather seems pretty good to me
Last edited by asmasm; 06-26-2014 at 12:21 PM.
#85
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well, you do have your AIT sensor mounted in metal just above something that's radiating temps over 190°F and blowing hot air on it...
but i have a feeling the temps are accurate; it's still hot in front of the rad.
but i have a feeling the temps are accurate; it's still hot in front of the rad.
#86
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The air in front of the radiator doesn't get as hot as you would think. I tested it for 20 minutes at idle with the car parked (until a pattern stabilized) and the results were:
Ambient Temp 82F
Air 4 inches in front of radiator stabilized at between 92F and 97F depending on if the fan was running. At any kind of speed there will be no convection and the air entering the filter ought to be very close to ambient. I am making a small aluminum heat shield to block any radiant heat but I am guessing that radiant heat is only a small contributor at the filter tip.
The sensor is heat soaking though. My IAT climbed up to 117 degrees with the car parked over this 20 minute period. Some of that is going to be heat soak into the actual intake air but I think it is mostly the sensor.
Ambient Temp 82F
Air 4 inches in front of radiator stabilized at between 92F and 97F depending on if the fan was running. At any kind of speed there will be no convection and the air entering the filter ought to be very close to ambient. I am making a small aluminum heat shield to block any radiant heat but I am guessing that radiant heat is only a small contributor at the filter tip.
The sensor is heat soaking though. My IAT climbed up to 117 degrees with the car parked over this 20 minute period. Some of that is going to be heat soak into the actual intake air but I think it is mostly the sensor.
#89
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The model is all polygons in 3dsmax so getting it into your software is going to be a pain. These are my export options:
I am going to try that but getting a bung into ABS plastic is going to be difficult. I have supplies for a carbon version coming and I will be able to epoxy in a bung down there.
Also, if anyone in the RDU area wants one, I have a pile of different versions of this duct.
Also, if anyone in the RDU area wants one, I have a pile of different versions of this duct.
#96
If you would like to see flow analysis of your part and visually see where it's chocked and possibly iterate the design for a better product I can help you out if you upload your part as an IGS. If not it's cool.
Good work on this project by the way. I'm considering 3D printing some ducting for my car eventually
EDIT: Just got the PM, will post back results in a bit