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Which means "Evil Twin". Lets see your projects where you change boring into fun or create the fun from scratch.
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PostPosted: Sun Oct 06, 2019 6:33 pm 
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I remember something about a big bore 4 cyl Honda that was built to comply with the 4 cylinder requirement. The ring pack on that thing must have been really unique.


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PostPosted: Sun Oct 06, 2019 6:46 pm 
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Here it is:
https://en.m.wikipedia.org/wiki/Honda_NR

A 120 degree v12 is effectively the same idea


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PostPosted: Mon Oct 07, 2019 11:38 am 
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You guys are making my brain hurt, it's a good brain but I am careful not to kill it. :shock:

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PostPosted: Mon Oct 07, 2019 12:15 pm 
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FoaTech wrote:
You guys are making my brain hurt, it's a good brain but I am careful not to kill it. :shock:


My head hurts too this morning, however it might have more to do with the bottle of Cab I polished off last night.

Still trying to figure out how Honda did the rings on those oval pistons.....


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PostPosted: Mon Oct 07, 2019 4:44 pm 
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Is the Testarossa engine a boxer 12 or 180 degree V12?


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PostPosted: Mon Oct 07, 2019 7:00 pm 
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TheDarkSideOfWill wrote:
Is the Testarossa engine a boxer 12 or 180 degree V12?


Yup, it sure is.


https://www.youtube.com/watch?v=LOILZ_D3aRg


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PostPosted: Tue Oct 08, 2019 6:37 am 
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cribbj wrote:
FoaTech wrote:
You guys are making my brain hurt, it's a good brain but I am careful not to kill it. :shock:


My head hurts too this morning, however it might have more to do with the bottle of Cab I polished off last night.

Still trying to figure out how Honda did the rings on those oval pistons.....


Yeeaaaahhhhhh, Uhmmmm, no. I am just stopping on that one. :roll:

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PostPosted: Tue Oct 08, 2019 9:54 pm 
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mk e wrote:
TheDarkSideOfWill wrote:
Is the Testarossa engine a boxer 12 or 180 degree V12?


Yup, it sure is.


https://www.youtube.com/watch?v=LOILZ_D3aRg


Which is it?

Not so sure that's the video you meant to link...


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PostPosted: Wed Oct 09, 2019 5:15 am 
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mk e wrote:
TheDarkSideOfWill wrote:


Which is it?

Not so sure that's the video you meant to link...


The 2 names mean the same thing so the answer is "yes", which was the point of the video.

The word V normally implies an angle less than 180 and at 180 it becomes a "boxer"...but its still a 2 bank engine with the angle between the banks 180, so 180 V12 is still correct in my view. I think when you say boxer I think split cases vs a V engine where I think single block....it doesn't have to be that way and I don't think there is any clear definition that dictates 1 name or the other.

When I started building the frankenferrari I used to joke I assumed the ferrari engineers were as lazy as me so when they were asked to make a flat 12 (see that, yet another name for the same thing) they pulled the V12 drawing, crossed out 60, wrote 180 and sent it to the shop so I expected the parts to interchange....I knew BB or TR head do fit a 308 block but I didn't realize all 3 were a newer design topend and not back compatible :(


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PostPosted: Wed Oct 09, 2019 9:17 am 
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A boxer has 180 degree split crank throws... a 180 degree V doesn't.

Image

So in the search, I found the article that graphic came from:

https://jalopnik.com/its-time-you-knew- ... 1825246413

He claims the Ferrari is a 180 V, not a boxer... the Berlinetta Boxer doesn't have a boxer engine. Funky. He also says the Porsche flat 12 in the 917 wasn't a boxer either. I guess since a 2 bank 12 will have perfect primary balance no matter what the bank angle is, there's no advantage to the extra complexity of a boxer.

https://en.wikipedia.org/wiki/Flat_engine

Subaru (and I assume Porsche) happens to throw main bearings in between paired cylinders, but each pair has pins that are 180 degrees out from each other. This wouldn't be the case on a 180 degree V. I think VW's only have three mains, so they're in the split crank throw category.

ETA: switched to a better graphic


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