Flat Plane Crankshaft

Engine, Transmission and related drivetrain.
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loungin112
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Flat Plane Crankshaft

Post by loungin112 » 28 Mar 2019 14:42

I never gave it much thought before, but came across this discussion on BAT: https://bringatrailer.com/2019/03/25/so ... vette-z06/

That said, it seems like old tech that never really caught on to become mainstream. I like the idea that these style of cranks - and the associated changes to ignition - are claimed to be more efficient than traditional/current designs.

Just curious what everyone's thoughts were. Also, did Datsun/Nissan ever dabble in flat plane crankshafts? I could only imagine how such tech could change the behavior of an L20b or a KA24DE...or even one of the higher revving straight 4s (I'm looking at you SR and CA).

I don't imagine this part will ever be made for today's Nissan/Datsun engine builders as it would likely be a pricey part that would see very slow sales.

But, interesting nonetheless.

datzenmike
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Re: Flat Plane Crankshaft

Post by datzenmike » 28 Mar 2019 18:30

Yes they did. All of their 4 cylinder engines are flat plane. Here is my flat plane or 180 L20B and Z22 crankshafts.

Image




:lol:
"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

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defdes
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Re: Flat Plane Crankshaft

Post by defdes » 29 Mar 2019 16:18

....and once they're knife edged, you REALLY have something!
crank5.JPG
crank5.JPG (165.94 KiB) Viewed 628 times


loungin112
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Re: Flat Plane Crankshaft

Post by loungin112 » 08 Apr 2019 15:27

datzenmike wrote:
28 Mar 2019 18:30
Yes they did. All of their 4 cylinder engines are flat plane. Here is my flat plane or 180 L20B and Z22 crankshafts.


:lol:

Palm----->Forehead

Sometimes, an idea seems so interesting, I go searching for information without doing research. In this instance, the realm was my go-to for info. Cool that Datsun had already explored and utilized this concept. I'll have to go out and take a look at my KA crank to see if it is the same...I think it would be.

Pretty cool about knife-edging the crank. I'll have to remember that.

datzenmike
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Re: Flat Plane Crankshaft

Post by datzenmike » 08 Apr 2019 20:04

All 4 cylinder cranks will be 'flat plane'. As they are all 4 cycle engines (compression, fire, exhaust and intake) and there are only 4 cylinders, I don't think you could do it any other way really.

Image

Don't bother. Here's my KA crank wearing a girdle.
"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

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gooned
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Re: Flat Plane Crankshaft

Post by gooned » 08 Apr 2019 22:26

It’s slimming!

510rob
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Re: Flat Plane Crankshaft

Post by 510rob » 09 Apr 2019 13:03

datzenmike wrote:
08 Apr 2019 20:04
All 4 cylinder cranks will be 'flat plane'. As they are all 4 cycle engines (compression, fire, exhaust and intake) and there are only 4 cylinders, I don't think you could do it any other way really.
Mike, you had to know that Japanese engineers would challenge that thinking sooner or later...

https://www.youtube.com/watch?v=eNph5Q9j1mE

https://www.youtube.com/watch?v=sqNi7TMSICs

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icehouse
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Re: Flat Plane Crankshaft

Post by icehouse » 09 Apr 2019 17:52

510rob wrote:
09 Apr 2019 13:03
datzenmike wrote:
08 Apr 2019 20:04
All 4 cylinder cranks will be 'flat plane'. As they are all 4 cycle engines (compression, fire, exhaust and intake) and there are only 4 cylinders, I don't think you could do it any other way really.
Mike, you had to know that Japanese engineers would challenge that thinking sooner or later...

https://www.youtube.com/watch?v=eNph5Q9j1mE

https://www.youtube.com/watch?v=sqNi7TMSICs

I don't get it. they fire evenly apart, what is the point? Going to have to think about it a bit longer.
"People don't like it when shit doesn't match their rule of thumb." Sam

datzenmike
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Re: Flat Plane Crankshaft

Post by datzenmike » 09 Apr 2019 19:25

"Sometimes I sits an thinks.... sometimes I just sits"

I meant most all are flat plane 1342 firing order as cheaper to make and for balance.
"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

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