DIY Warm-Air Intake

[13B_88FC]

rotaries are unfortunately inefficient at low load due to the inefficiently shaped combustion chamber (large amount of surface area compared to the volume). A cylinder is a very normal 3 dimensional shape with alot of volume for how much surface area there is.

Rotary engines make great racing engines though. At high load, they are very efficient, and, properly built, they are inherently reliable due to the few moving parts and their simplistic design. A 400 hp rotary engine will use less fuel than a 400hp piston engine when driven hard on a racetrack

[ciderbarrel]

Originally Posted by 13B_88FC

What kind of cold air intake is it? Is it just heatshielded or is it taking air directly from the outside?

Ramscoop style air filter w/ heatshield

C&L Racer Mustang Cold Air Intake (05-09 GT) 10699-05-PR - Free Shipping!

[Davinator61]

Originally Posted by 13B_88FC

Yes, two completely different engines, that I wasn't trying to compare.

the later model 13b twin turbo's in the 3rd gen rx7 produced up to 276 hp (limited by japanese regualtions)

There were no 4 rotor street engine produced by mazda, however their 787B which won lemans (and of course was later banned) was a 4 rotor NON-turbo with 650hp.

650HP?!? WOW!!! That's MORE than 50% greater than what the original design proposal I read about stated the HP would likely be! Well, it's kinda too bad the engine was banned, but maybe that was due to the cowardice towards such an innovative engine design from Mazda, by their competitors. My understanding of such an innovative engine design is that, amongst other things, its Redline RPMs would top out at OVER 15k, at least in theory, even if not in practice.

[13B_88FC]

Yes the redline would be very high. Of course, 15k isn't unheard of for even racing piston engines (i've heard of some F1 engines revving to 18k), and I'm not sure what exactly the 787b's 26B rotary was revved to during the race.

I saw this car in rosamund california last summer at sevenstock 15/mazfest 2012. It's like someone is drumming on your chest when they rev the engine. It sounded incredible.

I just looked it up and it's actually a 900 horsepower engine, that was limited to 700 hp during the race for longevity.

Yes, 900 horsepower from a 2.6 liter engine NATURALLY ASPIRATED. It's pretty astounding.

[razor02097]

Originally Posted by 13B_88FC

Yes the redline would be very high. Of course, 15k isn't unheard of for even racing piston engines (i've heard of some F1 engines revving to 18k), and I'm not sure what exactly the 787b's 26B rotary was revved to during the race.

I saw this car in rosamund california last summer at sevenstock 15/mazfest 2012. It's like someone is drumming on your chest when they rev the engine. It sounded incredible.

I just looked it up and it's actually a 900 horsepower engine, that was limited to 700 hp during the race for longevity.

Yes, 900 horsepower from a 2.6 liter engine NATURALLY ASPIRATED. It's pretty astounding.

F1 engines have a tiny stroke and enormous bore.. that is why they can rev so high.

[13B_88FC]

Originally Posted by razor02097

F1 engines have a tiny stroke and enormous bore.. that is why they can rev so high.

compared to the bore, the stroke is tiny, but both are pretty small since they are have so many cylinders for such a small displacment. (2.4 Liter v8's etc.) haha

[Christ]

Everyone forgot about the pumping loss reduction from WAI. Warmer air = thinner and easier to compress. It also reduces the effective compression of the engine because there's just less air being pumped in, meaning less force on the piston required to reach TDC on compression, so less bearing/ring friction, etc.

[13B_88FC]

Originally Posted by Christ

Everyone forgot about the pumping loss reduction from WAI. Warmer air = thinner and easier to compress. It also reduces the effective compression of the engine because there's just less air being pumped in, meaning less force on the piston required to reach TDC on compression, so less bearing/ring friction, etc.

I thought higher compression generally meant better efficiency? Or is it just that a higher compression, smaller displacement engine is more efficient than an equivalently powerful larger displacement engine with less compression?

Piston and bearing friction shouldn't be affected by compression, it's kinda like how there is the same rolling resistance from your tires if your going up a hill versus going on flat ground, at least that's how I see it. If it was effected, I suspect the difference would be very small.

[RH77]

Please refer to the Offset Crankshaft Thread for further discussion on that topic. Moved and Merged per request.

[jmmbmd2013ph]

good day guys, here's my question, would a WAI produce better FE to a carb engine? To add to that I live in the Philippines, average temperature for the day is 33C-36C (91.4F-96.8F).