MODIFICATION, COLD AIR INDUCTION

***AZmike*** · 09-03-2002, 05:21 PM

Originally posted by funstick
easy its called laminar flow. air will try to almost stick to a curved surface then the flwo path will always extend beyond that. by simply making a 1 inch tall lip across the hood you could recudedrag by a signifacant ammount. btw im talking about at the cowl area. this is why air dams are so effective at reducing drag even though it would apper that they would induce more. i still think picking up air form the cowl air would work the best as its already a high pressure flow area.

I didn't mean to start an argument, but laminar and turbulent have very specific meanings. Both laminar and turbulent flows will try to 'stick' to a curved surface if the pressure is lower in that region.

Whether or not a flow is turbulent or laminar is a function of fluid density, viscosity, flow speed, length, and surface roughness. So "turbulent airflow and laminar airflow can e created at all sort of vehicle speeds" is not true. Only the leading part of a long surface (like a car) will have a laminar flow. Once the length of the surface exceeds the critical value for the surface's roughness, the remainder of the flow will be turbulent.

Also, I'm not sure what you mean by "the windsheild induces a shear on the flow across the hood". If by that you mean it sends some of the air over the roof as well as deflecting some to each side then ok. Otherwise I have no idea what you mean.

Yes, I am majoring in mechanical engineering. What's so bad about 'thinking textbook'?

**si accord** · 09-03-2002, 10:47 PM

ok i've seen it on afew pic here and i wanted to know how they made there custom air intakes. a few pic and the supplies needed would be nice. hey if anyone that knows how to make them wants to make some money i would pay for parts, time, and shipping if anyone wanted to make one to sell to me.

**87pimpsterdocious** · 09-04-2002, 01:03 AM

look to staticpat and A20A1 for help on this

**87pimpsterdocious** · 09-04-2002, 01:15 AM

Since we now know its pressure, wouldn't the places where air is pushing the most be the most high flow? Like the bumper and right below the windshield. If so work should be done on trying to make and intake there, or at least route air from those places (the most possible being the bumper).

**DarknessRS** · 09-04-2002, 02:28 AM

I know this is late, but I'll have to agree with funstick about the fact that Ram Air > Colder Air. You only gain about a 1% increase in power for every 11F colder the air is. So unless you are running a turbo/supercharger setup, there are really no significant gains in making the air colder.

**Sean** · 09-04-2002, 06:01 PM

wel the gian could be signifacant if the actuall intake manifold get cool air runnign over it and shed heat better. shit thsaue intake is ully close to collant temp in the order of 200dgress F. so colling it down just 30 degrees could be huge. also ram air has been shown to give upto 5% increase in power. thats a big deal. i would say lets get the air funneled into the motor and get some air flowing over and around the intake manifold. realzing a bigger gain.

***A20A1*** · 09-04-2002, 06:40 PM

awe man, leave it to me to place the scoop opening right where the lines go flat... Now thats some engineering, LOL

**Sean** · 09-04-2002, 07:24 PM

turn the scoop around and get yr air back.

**si accord** · 09-04-2002, 10:21 PM

ok Thanks you don't have their Emails do you?

***A20A1*** · 09-04-2002, 10:31 PM

hey hey, Mine is all welded metal... I think the other one made was Cold welded using chemical adhesive.

I think the cold welded intake might be the best since it's easier to do. ask staticpat for the measurements and materials... he may have already posted it though. When you're done I can tell you how to hook up the vacuum lines.

**staticpat** · 09-05-2002, 07:52 AM

check out these threads first.

https://www.3geez.com/showthread.php?s=&threadid=4339

https://www.3geez.com/showthread.php?s=&threadid=4255

https://www.3geez.com/showthread.php?s=&threadid=4356

and i fwded you like 50 private messages that i wrote to other ppl. its real not that hard, though it would be alot better if you could get one professionally made by a sheet metal guy, or make it cold air, or do a ram air and hood scoop like A20a1.

**staticpat** · 09-05-2002, 07:54 AM

check out these threads first.

https://www.3geez.com/showthread.php?s=&threadid=4339

https://www.3geez.com/showthread.php?s=&threadid=4255

https://www.3geez.com/showthread.php?s=&threadid=4356

and i fwded you like 50 private messages that i wrote to other ppl. its real not that hard, though it would be alot better if you could get one professionally made by a sheet metal guy, or make it cold air, or do a ram air and hood scoop like A20a1.

**staticpat** · 09-05-2002, 07:55 AM

Originally posted by 87pimpsterdocious
look to staticpat and A20A1 for help on this

wow i feel so special now

i got referenced right along with a20a1 who knows a billion times more than i do.

**bobafett** · 09-05-2002, 08:46 PM

what would be the ideal orientation and placement of a hood scoop for a FI car?

***AZmike*** · 09-11-2002, 03:13 PM

Originally posted by A20A1
awe man, leave it to me to place the scoop opening right where the lines go flat... Now thats some engineering, LOL

Actually that's a fine place to put a scoop. There is no pressure against the hood there, so the flow is parallel to the surface--it still goes straight into your scoop. A higher pressure area might work a little better, but your spot isn't that bad. The front of the hood or roof are probably the only spots bad enough to make a difference.

**Thorny88Lx** · 10-10-2002, 01:19 PM

You are special... special ed

**Thorny88Lx** · 10-10-2002, 01:20 PM

j/k man your cool by me

**Site** · 10-25-2002, 06:41 AM

Water injection. I've been reading about it and have found nothing but positive results from this, on both N/A and boosted engines. Improved MPG. Cleaner engine. Better emissions (plus for my DCOE setup). Cooler engine. Less risk of detonation at increased HP. You can buy it. You can build it (at least some people can - :lol )

My question is this: since, in effect, water injection is kinda like an "in-cylinder intercooler" could you run turbo with no intercooler if you have water injection? A good intercooler is mass $ - one of the biggest costs of a turbo project. If a well built water injection system could keep things cool, then you could save some $.

**Site** · 10-25-2002, 07:22 AM

LOL - just found this article on Autospeed.com (man, I like that website).

Water Injection versus Intercooling
So which is better if you are running a forced aspirated car - water injection or intercooling? Each has its own advantages and disadvantages. Intercooling is a reliable means of reducing intake air temperatures and depending on the approach chosen, it can be a very simple system. However, it should be noted that while air/air intercoolers have few component parts, water/air intercooling is more complex than water injection. Intercooling systems require little or no maintenance, and a good intercooling system will provide an engine power increase in addition to preventing detonation. However, intercoolers are much larger than water injection systems and are generally harder to package. Finally, all intercoolers cause a restriction to intake flow.

Water injection is very effective at preventing detonation. It is not subject to efficiency drop-offs through heat soak and causes no restriction to intake flow. It is easy to fit as an add-on to an existing system, and because its components can be spread around the car, it is generally very easy to package. Unlike intercooling, water injection will not necessarily give a power increase. However, the biggest disadvantage is the requirement to carry a relatively large water tank - and to keep on filling it!

**Site** · 10-25-2002, 07:26 AM

Table

**Sean** · 10-25-2002, 07:34 AM

well you could always goto allchol water injector. teh blend seem to be queit popular in teh turbo crowd these days. id say go with a mix of intercooler and water injection.

***A20A1*** · 10-25-2002, 01:46 PM

I'm not sure but isn't Alcohol used to keep the carb from icing when you use draw-thru turbo set-ups. I may have mixed up what I was reading... anyways water injection was mentioned as a last resort to decrease the chance of detonation (turbo applications) since the supply of water isn't a constant.

A simple spray of water over the fins of the intercooler would increase it's efficiency... i was watching an RX-7 install one in the hood scoop. not sure what year his car was.

**3G Jester** · 01-05-2003, 10:45 AM

Get a cold air intake.....but about 1/4 inch smaller around then normal.......put it inside another tube. Then seal it off so it creats a pocket between the two pipes. Air goes through the pipe in the center...in the pocket surrounding the tube...fill it with freon from an old refrigerator or somthing.........

some sort of coolant......get it?

**Mike's89AccordLX** · 01-05-2003, 11:54 AM

I think I get it, but I am not that advanced to say if it would work or not.

**3G Jester** · 01-05-2003, 03:41 PM

<----Lost..........so where is the best place to throw a scoop? and drop that air into a air tight boxwith a ram air filter before running to your engine???

ne diff. between carb and efi?