Intake tubing question

[Vertigo]

im working on an intake of my own design, and just want a few opinions before i launch into it.

im going to run a tube to a mushroom filter, pointing up near the bonnet near the centre of the engine. i will surround this with a welded metal box, cut holes in the bonnet and mount a scoop.

1. what tube should i use, where can i get it, and how much?
2. weighing up costs and that im on a budget, and not looking for outrageous performance, should i bend the tube or just cut at 45deg angles and weld?
3. space issues decree i will have to run the intake tubing in a vertical spiral to the carb mouth.
4. im running a carb engine. is this even a good idea? ie. will i cause it to run badly/lean/not at all?
5. anything else i should know? yes, i realise itll be somewhat hot, but that should be lessened by bypassing some of the air from the scoop around the box, as well as inside.

[barryogen]

im going to run a tube to a mushroom filter, pointing up near the bonnet near the centre of the engine. i will surround this with a welded metal box, cut holes in the bonnet and mount a scoop.

so it's a cold air intake with a bonnet scoop to "hook" the air in... nice, and you may get a little "forced induction" at higher speeds.

1. what tube should i use, where can i get it, and how much?

Get some place to make it up for you, if in Dunedin, Ridez on the one way heading north are good.

2. weighing up costs and that im on a budget, and not looking for outrageous performance, should i bend the tube or just cut at 45deg angles and weld?

45deg would kill a lot of the very small performance gain that you're likely to get from doing this.

3. space issues decree i will have to run the intake tubing in a vertical spiral to the carb mouth.

Bends kill a lot of the speed

4. im running a carb engine. is this even a good idea? ie. will i cause it to run badly/lean/not at all?

slightly leaner than usual, but from factory cars normally run far on the safe side of that.

5. anything else i should know? yes, i realise itll be somewhat hot, but that should be lessened by bypassing some of the air from the scoop around the box, as well as inside.

It wont pic up a lot of heat as the air moving through it will cool it continuously... if you wrap it in a heat wrap it will stay cooler, but look less "blingy"

You'r not going to gain a hell of a lot over a CAI, and CAI give you f*ck all anyway.

[Santa'sBoostinSleigh]

pretty much what he said

[Vertigo]

better than the factory intake, im hoping

[Jebus]

Not really, and then youre also gunna have a bonnet scoop

[Vertigo]

hrm
if thats the case, whats the point in aftermarket air filters at all?

[bad20v]

What sort of vehicle is it?

[Vertigo]

its an AE80 with a 2A 1.3L carb engine. not the quickest around. but still goes.
and i plan to transplant with a 3A/4A/4AGE eventually. was hoping this might just give the oldie a little boost in response. plus it gives me a chance to practice metal cutting/welding and overall engine modification.

[Santa'sBoostinSleigh]

to be honest i dont think any induction mods will make any ass dyno difference (without adding forced induction )

[CozmoNz]

give the timing a thwack of advance...

will do alot more than any cai will do .

*I will not be held responsable for anyone who does this "to far"*

[jener8r]

why dont you just wait until you put the new engine into the car... theres not much point doing it to a 1.3L carby! ive got a 3a you can buy...

[barryogen]

hrm
if thats the case, whats the point in aftermarket air filters at all?

To look wanky?

[barryogen]

3. space issues decree i will have to run the intake tubing in a vertical spiral to the carb mouth.

Bends kill a lot of the speed

Further to that they also introduce a lot of turbulance... adding a grill or mesh of some sort after the corners to remove the swirling will assist with this(somewhat), but will also kill any gains you had.

There is usually a reason why the car manufacturers do what they do... not always, but usually.

[bad20v]

Like some of the more intellegent people have said, there's no real point in doing this to that sort of engine. You really won't get a big response from it. Wait till you have a better engine to put in there, and build a cold air induction unit for that.
In the mean time, even though it wont make much of a difference, experiment with different induction units for your existing engine. But please do not put some huge bonnet scoop on your car... it will just look wrong!

Use the 'Search' function in this forum and use the key words:

Cold Air Induction, or Cold Air Box, or Aftermarket filters

This topic has been covered several times and you should be able to find some good info on how to build an air induction system for your car.

Cheers




P.S: Aftermarket filters are not 'wanky' If you knew anything about modifying an engine, you would know that they serve a valuable purpose and in the right setups can give good power increases over standard filters/airbox's.

[barryogen]

P.S: Aftermarket filters are not 'wanky' If you knew anything about modifying an engine, you would know that they serve a valuable purpose and in the right setups can give good power increases over standard filters/airbox's.

sorry, I was meaning more the ones that people just remove the standard air box and shove a pod on there, sucking good old fashioned hot air into the engine... they're surely there purely for looks, and maybe a bit of induction noise, performance increase maybe from having it flowing a bit less restricted, but if don'e properly can be a heap better.

[rolla_fxgt]

Hey Barry how much did ridez charge u for you box?

[barryogen]

Hey Barry how much did ridez charge u for you box?

details on my site in my sig.