warm air intake

[SteveSRT8]

Originally Posted By: Shannow


The fuel does not evaporate when it's introduced into the intake, a fair percentage stays as liquid, and runs along the walls and floor.

Warmer the intake, and the fuel, the more enters the engine as a vapour, with a more complete chance for a full burn.

Of course, carbs and TBI, and systems that have injectors mounted further from the valve have the most to gain....and that's less common these days than ever before.

And warm air intakes WERE common, back when long wettedlengths were the norm.



And I look in my driveway and there is only one intake that is still a "wet" design.

Most cars with fuel in their intake had it heated, so unless you live in the Arctic you should not need this.

 

[mechtech2]

Warm air intakes may sometimes be temporarily OK for cold winter months.
But not a dedicated hot air system .

There are too many potential problems, and only benefits at very specific running situations. And that is maybe/marginal.
I discourage warm/hot air intakes.

 

[PZR2874]

WAI = SRI ?

I have NEVER heard of a WAI.

Meaning a short ram intake....?

 

[Hokiefyd]

Most SRIs are WAIs by nature.

A WAI is one designed specifically to supply hot air to the engine. Some guys make exhaust manifold shrouds not to BLOCK the heat from the manifold, but to COLLECT it and feed it to the engine. Engine performance suffers but fuel mileage usually increases.

I don't think WAIs are ineffective; I think they can generate results. I agree with mechtech2 above in that there are too many side effects and potential pitfalls with them.

 

[mpvue]

Originally Posted By: wheelman
So I want my car to get better fuel mileage. Its a 97 saturn how would I go about doing a warn air intake. And shielding The iat sensor?

which saturn do you have? what MPG goals do you have?
a SOHC saturn was hwy rated around 40mpg IIRC, a DOHC around 36mpg.
those are pretty good numbers, and lots of guys on saturnfans did way better than that.
what MPGs are you getting now?

 

[PZR2874]

Why would someone CHANCE pre-detonation for a 1/10 of a MPG ?

 

[Hokiefyd]

I certainly wouldn't on any of my vehicles.

But a lot of the folks doing these things are driving $500 Geo Metros, and the combination of the efforts sometimes results in 80-100 MPG vehicles, even driven somewhat "normally". We're talking things like WAIs, extreme under-body aero trays and the like, aero hubcaps, removing the power steering pump belt, etc. Stuff "normal" people wouldn't do, but if you're doing it for fun or just to see what you can get out of something, it has its purpose.

 

[Smokescreen]

Don't do it. In cars with carbs you would often see a tube running up from the valve cover to the intake to pre warm it for cold starts. Modern EFI & the MAF takes care of all that.

Visit ecomodder.com there are loads of ways to increase fuel economy. Adjust the driver technique is #1 by far the largest mod you can do...and its free, then aerodynamic mods are second, tires, getting rid of all the extra gear in your car are other large adjustments.

 

[HTSS_TR]

Remove the air box cover in my S2000, according to Ultra gauge the intake temperature went up from 100-110F to 135-140F for similar driving conditions, fuel mileage didn't increase any measurable amount.

 

[morris]

i like the warm air intake cause i didnt like all the trash that came in with the cold air intake.

 

[dwcopple]

Originally Posted By: HTSS_TR
Remove the air box cover in my S2000, according to Ultra gauge the intake temperature went up from 100-110F to 135-140F for similar driving conditions, fuel mileage didn't increase any measurable amount.
Wait, were you letting unfiltered air straight in the intake then???

 

[HTSS_TR]

The OEM filter on Honda S2000 is a cone type, remove the air box cover exposes the filter to warm engine air.

 

[dwcopple]

^ thanks for clarifying!

 

[IndyIan]

Originally Posted By: HTSS_TR
WAI vs CAI test results from GasSavers.org

"CAI (performed 5 bi-directional runs)
54.3 F avg air intake temp
79.12 km/gal (US) avg consumption

WAI (performed 4 bi-directional runs)
106.7 F avg air intake temp
79.31 km/gal (US) avg consumption"

http://www.gassavers.org/showthread.php?t=396

Pump your tires up 4-6 PSI above door placard may get you MPG increase more than the WAI.

I read that a WAI effectiveness tends to vary alot from car to car. Some seem to benefit quite a bit(4-5%)and others not at all. Probably the OP could find somewhere online where someone has tried it already with his car.
My Neon has a WAI stock but even it gets much better mileage in warm weather than cooler, as IAT goes up around 50F above ambient, whatever the ambient temperature is. Probably this has more to do with my engine oil choice but the mileage gain is quite noticable on the scanguage even after 30 minutes on the highway.