Home made V12 .... my uncle's next project

[Sidekicknichola]

did not know back to the 50s was this weekend

Its off a week from the usual, but starts tomorrow... which sucks because with this rain and tomorrow's forecast of 90* will mean its a hot humid sweaty mess.

 

[Throckmorton]

The crank would have the same angles as an I6 right? Otherwise you wouldn't get the I6 balance

 

[Sidekicknichola]

The crank would have the same angles as an I6 right? Otherwise you wouldn't get the I6 balance

Correct, just offset for the "opposite" angle to fire properly with the other I6.

 

[Throckmorton]

Correct, just offset for the "opposite" angle to fire properly with the other I6.

It looks like he's sharing each crank between the pistons on both sides though, so it would be the same design as an I6 crankshaft, just with more room for rods to join the crankshaft

 

[Throckmorton]

BTW it's a 120 degree V right?

 

[mrblotto]

Update?

 

[BoberFett]

If you're in the Twin Cities I'm sure we can swing by his house/shop.... I'm not sure on the crank 100%, but I know his last project (a 31' Buick) he did everything but paint himself, so my guess is yes.

I should be swinging by his place again this weekend, I'll see what progress he's made.


.... this is sort of his back burner project. He is working on a few other things at the moment too (dual flathead dragster and his 31' buick)

I'm in Minneapolis, my curiosity is piqued.

 

[Howard]

That sucker should make what... 800HP?

LOL

What do 600HP Supras and 800HP Supras have in common?

 

[Howard]

First time I've seen a block made from a custom weldment. My initial impression is that they better be damn good welds.

Don't you mean crankcase, not block?

Interesting choice to weld the crank-case elements together. I look forward to reading more.

I'm sure that all the parts were CNC milled. That way, it would be fairly easy to put in accurate locating points like dowel holes, slots, etc. to keep everything square.

I wonder if the higher strength of the steel used makes up for potential under-penetration of the welds.

 

[EightySix Four]

LOL

What do 600HP Supras and 800HP Supras have in common?

They both run 12's.

 

[JCH13]

I'm sure that all the parts were CNC milled. That way, it would be fairly easy to put in accurate locating points like dowel holes, slots, etc. to keep everything square.

I wonder if the higher strength of the steel used makes up for potential under-penetration of the welds.

You have far more faith than I do!

 

[Sidekicknichola]

UPDATE - Sorry it took so long!

Where things are at currently:

1. Cut the bottoms from two Toyota Supra inline 6 cylinder motors

2. Machined, welded, stress relieved and align bored a crankcase for
120 degree V angle.

3. Purchased a custom crankshaft from Scat with SB Chevy main bearings, Honda rod bearings. Honda H-beam rods too 4. Bolted cylinder blocs to crankcase using Toyota oil drain back holes modified.

5. Reversed one head so there are common ports to the center of the motor.

6. Put the exhaust ports to the center just for giggles.

7. Fabricated an oil pan from 3/4" aluminum plate and mounted a dry sump pump.

8. Built two cam drives and a serpentine drive for alternator and twin water pumps.

9. Started exhaust headers...no intake yet.

10. This is a 5 Liter/300 CI Turbocharged to a target of 800 HP


Latest photos:

 

[AdamK47]

It's very cool indeed!

Why did he decide to have the exhaust ports in the center and not the intake ports?

 

[crashtech]

6. Put the exhaust ports to the center just for giggles.

Sure makes me giggle!

In a turbo application, it might not be so bad to have the exhaust coming out the top at all.

 

[Ferzerp]

I have to ask again. What does this thing weigh?

(and what will it fit in?)

 

[Howard]

Sure makes me giggle!

In a turbo application, it might not be so bad to have the exhaust coming out the top at all.

If he was using a single turbo, sure. But with two turbos, you can get away with splitting your exhausts into at least two collectors.

Cool tubing work though!

 

[softshadow]

Amazing. Thanks for the update.

Would it be ok to use the photos and information to write an article?

 

[exar333]

You MUST post a video of this when it fires-up. REALLY want to hear this thing.

Amazing job!! This is just awesome.

 

[Sidekicknichola]

Would it be ok to use the photos and information to write an article?

Yup he said thats fine!

 

[crashtech]

Designing the cams will be fun.

 

[softshadow]

Yup he said thats fine!

Thanks.

 

[Sidekicknichola]

Designing the cams will be fun.

 

[Raizinman]

Would be much easier to just take two separate Supra Twin Turbo Engine and mount them like tractors do when they have multiple engines for tractor pulls. The engineering and design to do what your friend believes he can do is beyond his ability. LOL

 

[crashtech]

There are some problems to overcome, but I believe it is presumptuous to assess someone's lack of ability just from some images posted on the forum.

It remains to be seen if this conglomeration will make the number or not. I have many of my own concerns, having built many high horsepower engines and also having seen the result of making too much power with parts not properly designed for it. Of particular concern to me is the strength of the welds holding in the main saddles, and the strength of the connection between the cylinder heads and the side rails which look to be accepting threaded fasteners. Under boost the main saddles and the cylinder heads are pretty much wanting to get away from each other to the tune of thousands of pounds of dynamically oscillating pressure. The reason this is even more of a concern than usual is because the block is not integrated with the crankcase. Usually the cylinders and the water jacket carry some of the load that threatens to pull an engine apart, here it will be carried solely by fasteners.

 

[Howard]

You have far more faith than I do!

Closer inspection on my part reveals no such locating features... I wonder what kind of jig was used to keep everything aligned.