My Dream Engine

Kinja'd!!! "GhostZ" (GhostZ)
10/07/2013 at 16:41 • Filed to: None

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...is basically a BMW K1600 (the T-Rex engine) but with 4" bores and a turbo. In other words: a ~3.3l straight six, DOHC, 1 bar of boost, 7500rpm, and about 550-600HP.

That is all I wanted to say.


DISCUSSION (11)


Kinja'd!!! ddavidn > GhostZ
10/07/2013 at 16:42

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That sounds amazing. You should build this and throw it in an E30...


Kinja'd!!! HammerheadFistpunch > GhostZ
10/07/2013 at 16:46

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Where do the pistons go? a 4 inch bore means you need to find ~7 inches of extra length someplace. Why not get a large bore engine, and destroke it?


Kinja'd!!! GhostZ > ddavidn
10/07/2013 at 16:50

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It's absolutely impossible. The K1600 is awesome because it's so short. They had to widen the engine to fit the existing 2.8" bores, and as you can tell by the pictures, there isn't much more room to give. To get another 1.2" out of each cylinder means the whole engine has to be lengthened by about 7-10 inches, especially if you want enough cylinder wall to handle the boost. Add another 3-4" inches for more cooling lines between cylinders. By then you've added 50-75lbs to the whole thing, a lot of which is added to the rotating assembly. At that point, you've basically built an RB26DETT, but about 100lbs lighter I'd say.

Interesting of note with the K1600: The cam lobes are hollow. That's genius.

It would still be awesome, but there simply isn't room for the


Kinja'd!!! ddavidn > GhostZ
10/07/2013 at 16:58

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Of course it's not possible. If it was, it'd have already been stuck into an E30!


Kinja'd!!! GhostZ > HammerheadFistpunch
10/07/2013 at 17:05

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I know, which is why this is a dream engine, something I could never build. The closest in reality is an RB26DETT, but I bet that weighs twice as much.

Pretty much every larger-bore straight six is quite a heavier (An RB26DETT is only a little lighter than a Chevy big block, and the 2JZ isn't much lighter than the RB), but there's this simplicity in the extremely low weight rotating assembling and top end of the K1600. The camshaft lobes are even hollow.

Although... now that you mention it, I wonder if it s possible to find a 4.0 Ford Straight Six DOHC from a junkyard, and de-stroke it with a 144ci "thriftpower" crank. That's a 2.5 inch stroke on a DOHC turbo 3.1l engine.

I also wonder if you could do the same but with a Ford 300 truck engine, as they are reputed to be pretty much indestructible.

All wonderful dreams...


Kinja'd!!! HammerheadFistpunch > GhostZ
10/07/2013 at 17:10

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you could also destroke a toyota 1fz-fe, 4.5 liters down to 3 or so liters and turbo's to exploding should get the desired results. The trouble with I6 engines is that they have to be strong to resist twisting, so they are usually steel, heavily reinforced or both.


Kinja'd!!! ZeroOrDie - Powered By MZR > GhostZ
10/07/2013 at 17:12

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Is there some industrial ford straight six I dont know about? The 300 was OHV. So no high revving there. Thats why they didnt break. Enlighten me. 4.0 DOHC fords come from upsidedownlandia.


Kinja'd!!! ZeroOrDie - Powered By MZR > GhostZ
10/07/2013 at 17:13

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I'd like one of these and a turbo in a Miata or similar small lightweight car. Mmmmmhmmmmmm.


Kinja'd!!! GhostZ > ZeroOrDie - Powered By MZR
10/07/2013 at 17:18

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You can make OHV rev high pretty easily. It just takes a solid lifter cam, tight springs, and a head that can still flow that much air. A lot of lightweight, solid cam OHV V8s (LSX 454, for example) are happy to rev to 7500+ RPM on a long-stroke configuration and those are in V8s that have to have a heavier rotating assembly (both due to added balancers and more cylinders) than a straight six would.

That being said, the 300 OHV engine block is supposed to be really similar to the 4.0 block, but either way, a 300 with a 2.5-2.75 in stroke, solid cam, and great heads could probably take plenty of boost and come out screaming.

But as long as used RB26DETTs are still out there and I don't have free access to a machine shop, such a beast will probably never be built.


Kinja'd!!! BoxerFanatic, troublesome iconoclast. > GhostZ
10/07/2013 at 17:24

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Keep mine within a few fractions of stock bore and stroke, but see if it is possible to wedge more con-rod journals on a custom crankshaft... in a custom crank-case. Mirror the cylinder block, add another head, also with an optional bell-housing plate on one end of the crankshaft for longitudinal driveline, or leave a port on the side for the crankshaft gear, to put a gearbox along the side of the block (like the stock K1600 gearbox, or like a Lambo Miura transverse V12)

3200CC V12, baby! Think Hartley V8... but bases on the K1600 I6 engine, to make a V12.

BTW, on the idea of the original post, there just is no room in that block for a bore diameter that size.

This casting was built to sit sideways in a motorcycle, as narrow as 6 transverse cylinders can. It just isn't there.

It would be better to use one of the turbocharged I6 BMW automotive engines, instead, or the Volvo 3.2 T6.


Kinja'd!!! ZeroOrDie - Powered By MZR > GhostZ
10/07/2013 at 17:57

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I agree. A lot of old school drag racers think the Ford 300 is one of the best drag motors that no one knows about. My dad had a 240 in his work truck. He couldnt kill the thing. And he put it thru a lot.

Right people will go RB and 1JZ etc. I did a lot of research into the 200 and 250 ford inlines they need lots of cash thrown at them to be what a v8 could be with just a few mods. Thats why a lot of people dont go that route. However for the sound alone. I'd like one in a 84 fox body coupe all worked over with some side drafts. (this would mean getting an aluminum head with a manifold that isnt integrated)