We've all had this.
So to separate the plausible ideas. From the not without a metric tonne of gold fantasies.
Discuss:
Take your favorite 1 liter 200hp m\c engine and make it 2 liters keeping the ratios the same and the weights proportionate would you get a 300hp engine spinning to 13k?
How? Scanning blue prints? Sectioned junk yard motor? Then enlarge the image until the bore space is corrected for 2liters. Then make everything else fit. Print the tooling and cast. Machine. Build. Profit?
Could pneumatic valve springs be ecu controlled and eliminate the cams? 20k rpm 2liter
BarryNorman said:Take your favorite 1 liter 200hp m\c engine and make it 2 liters keeping the ratios the same and the weights proportionate would you get a 300hp engine spinning to 13k?
Yes. Assuming you made a 2 liter V8 using the same bore and stroke. Horsepower potential is basically valve area. Power does not scale linearly with cylinder size. (Those 200hp 1 liter bikes have the same valve size and bore diameter as hot 2 liter fours, just with half the stroke)
Here's a 450hp 2 liter V16 made out of four 600cc sportbike engines, destroked to 500cc per every four cylinders.
Apparently whatever class he built it for just has a 2 liter displacement limit, but beyond that anything goes.
Radical did the V8 job with Suzuki Hyabusa parts. It seems to work quite well.
I agree easier and better to take two 1liter i4s and make a 2liter V8 than it is to make a 2liter bigger i4.
In reply to TurnerX19 :
true, but Hartley did it better (first?)
In reply to sleepyhead the buffalo :
There was a four cylinder version ( hyabusa head bolted on) before everything was sold.
There is what I think is an E28 528i BMW sitting in the back corner of a parking lot. It's been there at least a year. The windows are all broken and it has trash in it. I swung by it 6 months ago and saw it is a manual. I keep thinking I should go see if it has an LSD and if it does, call the owner of the lot and see if they'll just let me haul it off for free.
In reply to Knurled. :
I was wondering feasibility of a four. Like each component 20% larger (or whatever the math is to make it correct).
might be easier to half the stroke and block of a 3liter four.
BarryNorman said:
In reply to Knurled. :
I was wondering feasibility of a four. Like each component 20% larger (or whatever the math is to make it correct).
might be easier to half the stroke and block of a 3liter four.
It doesn't really work that way. Power doesn't scale linearly with cylinder volume increases.
There are a few factors at work here.... the valve curtain area IS the engine's power potential. A 200hp 2 liter car engine and a 200hp liter bike have approximately the same valve sizes and bore diameter. To make more power, you need larger valves, and to have larger valves you need more bore, but as the bore increases, displacement increases out of proportion to the amount of valve area you can get (since the max valve size is defined by the circumference of circles that you can fit in the surface area at one end of a cylinder, while displacement is defined by the area of that cylinder) unless you keep cutting the stroke to compensate.
The other thing you run into is flame speed. The larger the bore, the longer it takes for the burn to propagate through the cylinder. Interestingly, the reason why F1 had a minimum octane rule is because they were getting around the flame speed problem by basically making the engines run on detonation, which happens MUCH faster than regular combustion.
Anyway, this is why HP/l kings are always fairly small cylinder displacements. It's down to breathing and combustion, basically. If you want to scale that up, you need more cylinders, not more displacement per cylinder.
Ferrari's first engine was a 1.5l V12..
Next, Stampie's t/a build, or the like, plus Indiana's Schweinefiletring. As a poker run using a car based on early 20th century frame and cowl. The rest is up to you.
In reply to Knurled. :
Thank s that great information. Now I can move on to other ideas.☺
Now another query. Can you print life size body panels/molds from a really good scale model?
As in how did a full size McLaren F1 over a tube framed Evo come to exist in European hill climbing?
