Project: Lets confuse the hell out of everybody.

[Hey_You]

I agree with using the Suzuki engines as well. But I'm a huge fan of cars with bike engines after watching this video.
Busa MK1 Golf

[unevolved]

How are you planning on dealing with the opposite rotation of those engines oriented like that?

[Sagaris]

As i am a motorcycle mechanic as well as a bmw tech I would strongly suggest going with a suzuki motor rather then a r1. They put out much more power and have a much more broad power range. If you are looking for a good engine to do this with as well i would go with the k5 gsxr 1000 due to the large amount of parts available for them and them being cheap as well. Not to mention the literature for them is all over the place if you needed to find anything.

I appreciate the input, I will definitely consider it. I am not set on any particular set of engines at this point but have used an R1 engine for modeling, pricing, and some calculations to gauge the feasibility of the project.

As the feasibility of the project continues to look better and better, more thought and decisions will be made, including a serious comparison and research of which engine(s) would be best suited and what is available.

If I was Scandinavian, and single, I assure you that this project would be finished over the winter, would have some type of gigantic turbo, and I would be playing it off as if it was a beige Camry.

I certainly welcome the ideas of the E30 community and knowledge of those more experienced with motorcycles. I have a good idea of how it all could go together but my ideas are not the final word and there are likely many other better ideas and options that I have not considered. :up:

[Sagaris]

What are you planning transmission wise?

There are certainly a few ways to go about this.

I hate the thought of having 3 transmissions in the car but at the moment but the initial approach is to keep the G260 and E30 driveshaft just how they are and lock the bike gearboxes in 3rd, 4th, or whatever ratio makes the most sense (would even be interesting to design a linkage system that would allow it to be shifted on the fly.... 30 possible forward gears, 6 reverse :rofl:)

Depending on calculations, the bike clutches will likely be upgraded to something suited for drag racing duty to prevent slippage from the extra weight of the car vs bike+rider, but the E30 clutch and transmission will be the only ones being operated while driving the car.

[2l2ltq]

Yes, less weight than an M20, 2x the power output, and likely an absolute symphony of induction sound when coupled with a carbon fiber plenum.

In a perfect world I would be using S1000rr engine to keep it BMW (and also because those are amazing engines) but the pricing and availability is much more favorable for the Yamaha and Suzuki engines. Example: a few months ago when the idea popped in my head I browsed Craigslist for used bike engines. a 12000 mile R1 engine with harness, and ECU was $1000, and a 16000 mile engine with no ECU/harness was $800.


Assuming this project is completed with a pair of R1 engines, I would eventually want to step up to a pair of S1000rr engines.

As i am a motorcycle mechanic as well as a bmw tech I would strongly suggest going with a suzuki motor rather then a r1. They put out much more power and have a much more broad power range. If you are looking for a good engine to do this with as well i would go with the k5 gsxr 1000 due to the large amount of parts available for them and them being cheap as well. Not to mention the literature for them is all over the place if you needed to find anything.

[lambo]

What are you planning transmission wise?

[CrusherCurtis]

R1 engine is a rocket! Isn't 16k miles kinda high for something like this tho?

[E-Thirty]

Kinda curious as to how you'll implement the cooling system.

What about just putting in a modded zx-14r engine in there for the sake of sound? :p

[unevolved]

The gesture is appreciated. If you have any 3D modeling skills, electrical engineering, or mechanical engineering experience then you could certainly be of help.

I am a mechanical engineer but will likely consult with some electrical guys on the charging system (if/when the project becomes a reality)

Yeah, I'm an engineer too, I do a lot of 3D modeling and design-for-manufacturing stuff (design engineer for a manufacturing firm). I do a lot of stuff with laser cutting (flat and tube) so if you want to get real serious, let me know.

I'd definitely say you'll want a steel subframe, an aluminum subframe will almost certainly crack.

[F34R]

I want to see this happen...badly!

[Sagaris]

I think I see what's going on in here, and if I do I am impressed.

Yes, less weight than an M20, 2x the power output, and likely an absolute symphony of induction sound when coupled with a carbon fiber plenum.

In a perfect world I would be using S1000rr engine to keep it BMW (and also because those are amazing engines) but the pricing and availability is much more favorable for the Yamaha and Suzuki engines. Example: a few months ago when the idea popped in my head I browsed Craigslist for used bike engines. a 12000 mile R1 engine with harness, and ECU was $1000, and a 16000 mile engine with no ECU/harness was $800.


Assuming this project is completed with a pair of R1 engines, I would eventually want to step up to a pair of S1000rr engines.

[Sagaris]

Dude. I wanna see this happen. Let me know if you need any help.

The gesture is appreciated. If you have any 3D modeling skills, electrical engineering, or mechanical engineering experience then you could certainly be of help.

I am a mechanical engineer but will likely consult with some electrical guys on the charging system (if/when the project becomes a reality)

[YosemiteSam]

I think I see what's going on in here, and if I do I am impressed.

[Sagaris]

Very interesting. The biggest problem, or I guess one of many, is how you will deal with vibration issues. It's going to take a hell of a balancing system in order for it to work. Huge props for trying something different.

The idea at the moment is to connect the engines with a dual roller chain drive and sprocket at the existing sprocket output location on the engines. The engines would be solidly mounted to an aluminum framework which would be mounted to the original E30 subframe with rubber isolators.

Horizontal dampers connecting to the cylinder heads would likely be helpful in reducing vibrations due to both engines generating torque in opposite directions. FEA analysis would play a role in determining whether the framework needs to be constructed of steel to avoid fatigue.

[canakami]

Ho snap...