Do tell of this other tech. I'm only aware of a clutch or some version of a torque converter. I once read an article where an electrically charged fluid could change viscosity to lock up the drive.
Custom engine builders?
- Thread starter TheAtomicAss
- Start date
The title will most probably put you off, why it is missed by so many, but scroll down and play with the sliders and you will see no clutch no nada.
There is the option to take out the electrical motors and replace with hydraulic devices if battery weight is a problem.
BMW future prototypes with high performance is following the same concept. Besides efficiency, the main advantage is you can immediately spool up a high RPM motor into its power range and use the maximum available power that will not break wheel traction. Nothing slips, direct drive and no heat is generated and it is pretty efficient.
Another way to explain this is a gearbox without a clutch, with an infinite transmission ratio.
Toyota Prius - Power Split Device
FlatlandBusa
Registered
Yes the traditional torque converter is a terrible waste of energy all in the name of silky smooth drivability.
My wifes Focus has the 6 speed dual clutch (dry clutches so it is less complex compared to the smoother wet clutch setups like VW) transmission in it, it returns 28-29 MPG in town and 33-39 MPG on the highway (speed dependent).
I can tolerate the minor roughness and occasional shudder this transmission generates since it returns fantastic mileage with reasonable performance.
TheAtomicAss
Registered
I suppose I'd have to see a working version to understand the principles of it. Explanations never jived with me much.The title will most probably put you off, why it is missed by so many, but scroll down and play with the sliders and you will see no clutch no nada.
There is the option to take out the electrical motors and replace with hydraulic devices if battery weight is a problem.
BMW future prototypes with high performance is following the same concept. Besides efficiency, the main advantage is you can immediately spool up a high RPM motor into its power range and use the maximum available power that will not break wheel traction. Nothing slips, direct drive and no heat is generated and it is pretty efficient.
Another way to explain this is a gearbox without a clutch, with an infinite transmission ratio.
Toyota Prius - Power Split Device
TheAtomicAss
Registered
Also, relevant to this thread, it's amazing the things you find when you twist your Google-fu the right way.
Just need to mount a bigger alternator.
Just need to mount a bigger alternator.
Planetary gears is an old concept, what makes a difference today is the availability of advanced control engineering to use them to their full extent. By controlling the the different gears in the system, you can have infinite transmission ratios, both in forward and reverse, no clutch.
Here in the US, it is also referred to as Epicyclic gearing.
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I guess I don't get the "infinite" ratios with the planetary gearing. You could have different ratios depending on whether you drove the little gears or the larger center shaft but the relative ratios are fixed. What am I missing?
Play with the sliders on the previous link, it is pretty self explanatory.
Here is some more narrative, Nissan uses a design I would not use, but the output is somewhat similar. It is not planetary though and will not be as reliable.
Definitions: Continuously Variable Transmission (CVT) - Autotrader
What I like about it, is that if your motor develops maximum power at say 10,000 RPM, you can spool the motor up to 10,000 RPM out of the gate and keep it there until you cross the 1/4 mile line.
TheAtomicAss
Registered
I meant that, without the gas guzzler, MG1 and MG2 in the models, I can't picture how the Prius uses this to do it's thing.
TheAtomicAss
Registered
Actually, no, those things SUCK power pretty badly. I've put 26,500 into the Burgman 400, and it's single has a lot of potential which is wasted on the CVT. And at least in Suzuki's variation, it was not possible to achieve high revs until sufficient velocity had been gained, with the engine staying below 5k until well past 35 mph.
ETA: I'd honestly buy a new Burgman, if they could stick a manual in it and throw in some hydraulic lash adjusters.
motonutz
Registered
10 grand, the only build ull get for that is a bike with a whole drilled in the air fiter box.when u said 10k u lost everyone lol, and todo something comparable to a 650, why? the fellows including me thought u were talking about what i ACTUALLY did.
At my home track i race a 9.99, 9.50 index classes, crazy 8s, an pro bike n sled. ( Ihave Busas for each class) Then they said a new, street legal heads up class was comng the next year, What a perfect opportunity to do a real custon bike and engine build! i knew it was a money class. The one with the most money and least brains to put it 'ALL INN' the build would win.
And i won. i may have the worlds quickest, and gorgeous Hayabusa. it is still street legal, the engine is an original 1625cc stroker. over 300 hp!!! @311hp the rear wheel started spinning (shredddding) on the Dyno. we called Dyno Jet and they said 'add 20hp' Bike weighed 500 lbs. to start and now weighs 435lbs.
The bike took a year to build. spent $15,000 just in shipping all over the States and Canada. The paint on the bike took 4 1/2 months, min 60hrs a week.
Take a look at my profile pics, and there u wil see one of the sickest Hayabusas. In the World...
At my home track i race a 9.99, 9.50 index classes, crazy 8s, an pro bike n sled. ( Ihave Busas for each class) Then they said a new, street legal heads up class was comng the next year, What a perfect opportunity to do a real custon bike and engine build! i knew it was a money class. The one with the most money and least brains to put it 'ALL INN' the build would win.
And i won. i may have the worlds quickest, and gorgeous Hayabusa. it is still street legal, the engine is an original 1625cc stroker. over 300 hp!!! @311hp the rear wheel started spinning (shredddding) on the Dyno. we called Dyno Jet and they said 'add 20hp' Bike weighed 500 lbs. to start and now weighs 435lbs.
The bike took a year to build. spent $15,000 just in shipping all over the States and Canada. The paint on the bike took 4 1/2 months, min 60hrs a week.
Take a look at my profile pics, and there u wil see one of the sickest Hayabusas. In the World...
TheAtomicAss
Registered
Well, unlike typical reasons for building a truly custom, from the ground up engine (HP bragging rights), my goal is to test some theories rattling around in my brain meats, that if correct, (and the builder was competent in his craft AND tuning), would give me MPG bragging rights. Plus, if you've happened to glance at the doc, said engine has 12 CYLINDERS. There are some smooth bikes out there, but I seriously doubt any that are that smooth.
Now, that being said, I've put a fully custom engine on the back burner, but I have a new, more reasonable project to tackle. I've been doing a bit of reading into the Prius engine, and the special cam profile it uses to effectively transform itself from an Otto cycle into an Atkinson cycle engine.
So what should I expect to pay, (ballpark) and what are some good shops to consider to get a cam ground to my specs, plus a tune?
ali123
Banned
old thread... but I got a good laugh here.... 10 grand fellas.... lol
+1
a casting mold will be cheap and easy to make. And aid in R&D on forged and milled parts.
How about now
It's not common place, but already being done.
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