Did you guys know that a 13B rotor weighs around 5 kilos? (a

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straight six thread

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Vtec thread

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Recently had the chance to disassemble a 13B-DEI as a side project, probably one of the easiest engines to service ever.

Sadly it was fucked required new housings and rotors, It had been sitting outside for years and collected water inside the chamber rusting out the rotors.

>>15508054
Why do you think they break so often?
Rotating mass is a serious issue.

>>15508124
nice meme there dude.

>>15508124
That's some of the dumbest shit I've ever heard

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>>15508124
lel

Let me present you something more interesting and factual.

>>15508070
Is this the best engine configuration ever conceived?

Have any of ypu read about that rotary x engine from liquidpiston? I saw it on the news a few weeks agod and thought it was kind of neat. Does it have the potential to go anywhere commercially or will it be regulated to niche applications

http://video.mit.edu/watch/a-new-rotary-engine-design-658/

Rotary os not dead

>>15508983
Yes, this is what i was talking about. Is it as exciting as they claim it to be, can it actually be scales up to work with a car or motorcycle

>>15508054
A rotor is significantly larger than a piston and made of steel rather than aluminum. If you want light weight, Mazdatrix was selling 5 pound titanium rotors for $2500 each.

>>15508983
>Rotary OS
God forbid such an abomination be created or loaded into a PC

>>15508054
But those rotors do not change direction like regular pistons. Also the crankshaft is much simpler and no conrods are needed.

Also there is three sides in those rotary pistons so would it be fare to compare it with three regular pistons with conrods?

>>15509116
It's still significantly heavier than three pistons with rods, but not having to change direction counts for a lot. Plus, the closer the mass is to the center, the less it affects moment of inertia.

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>>15508070

>>15509126
How heavy is the 13B flywheel compared to similar power regular engines? Does the rotating pistons have any effect or are the flywheels weighin the same?

>>15509101
New Android and ios competitor

>>15509255
>Memory floods after closing a few apps and turn in the screen off
>Needs to sit before it can be rebooted

Typical

>>15509126
A piston has to totally change direction, a rotor does not.

The rotor merely spins and a lot of the mass is closer to the point of rotation reducing the moment where as a piston is rotating up and down about a point along a rod far from the peak of oscillation.

Basically put the piston is experiencing far higher forces and moments of inertia which is why rotors pretty easily rev up to 11-12k RPM's with very little done to them despite being 5kg whereas pistons at 400g require a properly, high-quality engine build to even get close to those numbers.

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What kind of horsepower can you get from a street-ported 13B? I'm thinking of getting an old beat-up FB to turn into a weekend hoon machine/track whip.

>>15509722
I hope you're not counting on running that plate. It's fucked. Street ported NA is good for maybe 150-180 at the wheels depending on how aggressive it is.

>>15509139
The flywheel is significantly heavier than a typical I4 or I6 sprtscar flywheel because it has a counterweight built into it. The aftermarket lightweight flywheels are much lighter than normal because they're designed to bolt to the counterweight from the back of an auto trans engine. It's hard to compare.

>>15509624
Yeah, that's my point. 22 pounds of pistons and rods would be insane for anything even remotely sporty. 22 pounds of rotors isn't that much because they never have to stop and turn around.

>>15509722
Depends on the type of porting and how aggressive it is, probably in the realm of 170hp or so..

Generally 12A's/13B's don't break 200hp naturally aspirated without some serious shenanigans.

I wouldn't worry too much if you're just after a simple track or hoon machine, the FB is very light to begin with.

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>>15508054
>Take rotary
>Turn inside out
>Most efficient engine ever designed

The dorito is literally the inverse of a good engine

>>15509624
It's worth remembering the rotors spin at a third the speed of the eccentric shaft. So at 9,000rpm the rotors spin at 3,000rpm.

>>15510155
>most efficient engine ever designed
>because some faggot said so

Let's see them build it and actually use it in a car then.

>>15510155
Needs to be properly scaled and tested in a car.

I'm not holding my breath until they do.

>>15510175
>>15510203
It won't work in a car. It's a steady state engine like a gas turbine. It's designed to work with a generator or hydraulic transmission

>>15508054
wow that's heavy
so much rotating mass that rides on a steel squigy for compression. Back to the drawing board mazda

>>15510434
They can fuck off with it then.

>>15510472
>being literally retarded

>>15510482
>mazda literally went back to the drawing board

>>15510485
>what you mentioned has literally never been a problem with rotaries and mazda is changing other things

fuck off tard

>>15508054
Did you guys know a piston weighs 500 grams? (around 1lb for you yanks)

>>15510492
>compression and apex seals have never been a problematic on rotary

ermergerd butthurt rotard lol

>>15508340
no

what's the compression ratio on naturally aspirated rotaries? RX8 specifically but i'm also interested in SA22 and FC

>>15510203
>>15510434
Not a car but they got it work in a gokart.
https://www.youtube.com/watch?v=fIPCx1az7ks


not the best video but it at least proves the concept works. you can't really verify the efficiency claims until they become more commercial or you spend like 20k on a prototype

>>15510501
The weight of the rotors is a meme issue, low polar moment of inertia.

>>15510539
http://www.re4life.com/index_EN.html

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>>15510557

>>15510587
pic doesn't have to do with anything I just said.

dank meme you got there.

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>>15510577
the site looks like it's still stuck in the '90s

>>15510472
>rotating mass that rides on a steel squigy for compression. Back to the drawing board mazda
>>15510501
>>compression and apex seals have never been a problematic on rotary

>Changing goalposts
>Can't deal with the best engine ever produced

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>100 hp at 9000 rpm

>>15510603
90's internet aesthetics are pretty based tbqh

>>15510501
Did a rotard fuck your mom or something dude jee

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so much mad lmao

>>15510611
were not talking about honda engines here.

>>15508112
This car is 100% pure sex apart from the lip.
TFW no RX3

>>15510611
lol i love this meme xD

>>15510642
Fuck off wherever you crawled out of with this cancerous shit.

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>>15510728
dun blow a seal bra

>>15510831
Holy /v/

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>>15510831

>>15510831
i missed this pasta

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>>15510831
Is this what brain failure looks like?

>>15511023
Not enough fire.

>>15508054
How hard is it to change the apex seals though?
Is it like changing the oil, or do you have to completely rebuild it?
Are rotaries easier to rebuild?
They look like they would be simpler to take apart but idk.

>>15513899
There's essentially only three moving parts.

>>15513899
To change the apex seals you are required to tear down the whole engine to access the rotors.
However, rotaries are simple to tear down and can be rebuilt quickly after a repair or upgrade.
Depending on experience and what being worked on, it could be easily be done in a day or less.
It's literally just a big sandwich of 3 iron plates, 2 aluminum housings, and 2 rotors.

>>15513943
Where does the oil go?

>>15513998
Into a Jerry can with the gasoline

>>15513998
what do you mean where does it go, like where in the engine?

>>15514003
two-stroke premix, not just straight engine oil.

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>>15514003
Like a 2 stroke?
shiiiet.

>>15514017
Nigga I'm making my own pre-mix

>>15514020
Yep

https://www.youtube.com/watch?v=v3uGJGzUYCI

>>15508340
yea
>best sound (some v8s are better)
>most simple
>perfectly smooth, no balancers
>looks best
>takes boost best
>makes most torque because pistons push thr crank a full 120° unlike v style