1990 Toyota Corolla Auto Choke

Hi there,

The choke is only for cold starts there is no other function for it, if you find it not a problem that is fine, you don't have to have it, it is also coupled to a choke fast idle the helps keep the engine revs up during cold running, the choke is very simple and it may not take a lot to get it going again, but if it is not an issue that ok.

Mark (mhpautos)

Thanks.

Can you tell me more about the difference between Cold Air Intake and Warm Air Intake? I heard that some people and some old cars utilize Warm Air instead of Cold because it's economical? I read that the Jag E-type uses WAI and not CAI.

More power.

Hi there ,
Cold air intake is where the air is drawn from outside the engine bay, engine bay air is hot, hot air is less efficient in the combustion process as cool air is denser and this give better volumetric efficiency, you may have noticed how your car runs better on cool nights compared to hot days, this is the effect of the cooler air being denser.

Mark (mhpautos)

Thanks.

Which would you recommend? A Cold Air Intake or a Ram Air Scoop? Why?

Some say Cold Air Intakes, with the stainless steel pipes only make the air hotter, so if I fabricate a scoop system as close as possible to the position of the throttle body and air filter, will that be more efficient?

Hi there,
You have to be careful about trying to re design inlet air flow systems, air being drawn into the engine relies on a good laminar flow, otherwise swirls & eddies interrupt the air flow and this is not desirable, you have to take into account any air flow sensors, density & air temp sensors in the system, you could cold ram carbies with out a problem, but modern EFI engine have millions spent on developing their air flow systems, so i would be very hesitant to do much altering at all.

Mark (mhpautos)

Thank.

I have a carb so I guess I can cold ram it.

My plan is to put a filter directly on top of the carb intake, then cut-out a vent on the hood on top of it then fabricate a simple air scoop.

Question: Should I adjust anything, anything I should take care of?

I just have to find a way to prevent the rain from being suck into the engine bay.

Thanks again and more power.

Hi there,

There is one thing that i did forget to mention, and that is the noise factor, you may find that this may be rather noisy, induction noise can be quite loud, what i would do if you are really keen to try this out, i would go to the wreckers and get a cheap usable spare bonnet and try you idea with this and if it works and not to noisy you can attack the good bonnet, best to have a test bed to play with than damage the final job with mods along the way. remember ram air is just a term, you will not actually be boosting air flow like a turbo, this will give you cool air that is slightly denser (depending on atmospheric conditions) the benefits if any will be derived from this and not the fact of scooping outside air, the air filter will still dampen any ram effect, (turbos are after the air filter) you may have seen some cars with reversed shakers, (air scoops pointed back wards) this is just to eliminate the problem of dirt and bugs and junk blocking the filter, you will still get cool air this way but less road muck causing problems.

Mark

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