This fan idea was exactly what i was going to do till I purchased a DTM.... Less time, and work. I had planned to use a thermoplastic for my mitre gears since I know someone who makes custom gears for boat racing transmisions and with his machines the sky is the limit for anything. This way there would be no oil bath to run the steel gears in. Cleaner looking, potentialy less messy and simpler to build. I may still try this route in the future with many other of my ideas, my problem is allways time, and I'm a bit impatient. It's easier to buy something allready made and proven.
Kevin
Fan conversion rambling
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GDRBO
- Posts: 2574
- Joined: Tue Jun 27, 2000 12:01 am
Fan conversion rambling
I have a Corvair style cooling system for a T-4. I believe it to be "homemade". It is different from the Riechert in that one of the idlers has been replaced by the alternator. It has a steel mount with spindle that bolts to the top of the case.
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Piledriver
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- Joined: Sat Feb 16, 2002 12:01 am
Fan conversion rambling
As to the "clutch", rather than an electronic nightmare, I was thinking an eddy current fan drive, basically a power limiting clutch with no moving or electronic parts, power transmission adjustable by setting the gap between the magnets and the copper shell.
Think a spinning hub with large permanent magnets, with a copper flywheel around it.
Looks like a centrifugal clutch, but no contact.
Google "magnadrive" and "eddy current clutch"
Think a spinning hub with large permanent magnets, with a copper flywheel around it.
Looks like a centrifugal clutch, but no contact.
Google "magnadrive" and "eddy current clutch"
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ray greenwood
- Posts: 1941
- Joined: Thu Jul 19, 2001 12:01 am
Fan conversion rambling
Piledriver...nice forward thinking. I see those types of drives on equipment in the print industry, usually take-up rolls, pumps etc.
Billy, it will be interesting to see if what your plastic gears turn up...but there are few plastics than would tolerate the loads on the teeth. Without oil, they will generate heat. Torlon (teflon family) is ridgid and almost friction free, but only has impact resisdtance and torsional resistance similar to delrin. A block big enough to machine...is about $600. But you never know what you will find out there these days. Ray
Billy, it will be interesting to see if what your plastic gears turn up...but there are few plastics than would tolerate the loads on the teeth. Without oil, they will generate heat. Torlon (teflon family) is ridgid and almost friction free, but only has impact resisdtance and torsional resistance similar to delrin. A block big enough to machine...is about $600. But you never know what you will find out there these days. Ray
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Piledriver
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Fan conversion rambling
Thanks.
There used to be a place in Ft. Worth that did the drives, but google is letting me down at the moment.
As to the plastics, polyamid(e?) variants are among toughest, most machinable, and also the slipperiest stuff known, although not necessarily at the same time. Some are good over 300 degrees (C).
Cost is similar or slightly more than PFTElike materials, but FAR more useful for machine parts.
(Slick 001 (a polyamid(e?) variant) has a coefficient of friction of .001, teflon is about 30 IIRC. No, you can't put it in your oil...)
[This message has been edited by Piledriver (edited 08-01-2002).]
There used to be a place in Ft. Worth that did the drives, but google is letting me down at the moment.
As to the plastics, polyamid(e?) variants are among toughest, most machinable, and also the slipperiest stuff known, although not necessarily at the same time. Some are good over 300 degrees (C).
Cost is similar or slightly more than PFTElike materials, but FAR more useful for machine parts.
(Slick 001 (a polyamid(e?) variant) has a coefficient of friction of .001, teflon is about 30 IIRC. No, you can't put it in your oil...)
[This message has been edited by Piledriver (edited 08-01-2002).]
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Roland Kunz
- Posts: 177
- Joined: Mon Mar 12, 2001 12:01 am
Fan conversion rambling
Hello
Dual squirrel fan setup ?
Moment, there was a V8 back in 1935 using that system.
Porsche used a switchable fan on the formula 1 engines. IFIKK they runed 5-10 secounds free of that load and that was enough for overtakeing or pulling ahead so your follower was back in the wind drag again.
I think they got sacked in, not allowed using that adavantage over the waterpumpers. ( hey the waterpumpers could also have disengage the waterpump
)
In the late 60´s they also testet to drive the coolingsystem with the exhaustgases.
The reason was they needed every squareinch in the enginebay to fit large intercoolers.
Now it didn´t worked good enough so they made the watercooled interchangers and cleared room with the corvairstyle fan
The angle-geardrive cost power but spliting the alternator and using a for race optimized 300 Watt unit ( sprint races, for durance larger units ) payed back.
On the group 5 cars ( 935 ) they stayed with the conventional system but could move the firewall and add on some spoilerwork out from the stock shiluette ( thanks to BMW trying to pull a advantage for there cars on that )
Grüsse
Dual squirrel fan setup ?
Moment, there was a V8 back in 1935 using that system.
Porsche used a switchable fan on the formula 1 engines. IFIKK they runed 5-10 secounds free of that load and that was enough for overtakeing or pulling ahead so your follower was back in the wind drag again.
I think they got sacked in, not allowed using that adavantage over the waterpumpers. ( hey the waterpumpers could also have disengage the waterpump
)In the late 60´s they also testet to drive the coolingsystem with the exhaustgases.
The reason was they needed every squareinch in the enginebay to fit large intercoolers.
Now it didn´t worked good enough so they made the watercooled interchangers and cleared room with the corvairstyle fan
The angle-geardrive cost power but spliting the alternator and using a for race optimized 300 Watt unit ( sprint races, for durance larger units ) payed back.
On the group 5 cars ( 935 ) they stayed with the conventional system but could move the firewall and add on some spoilerwork out from the stock shiluette ( thanks to BMW trying to pull a advantage for there cars on that )
Grüsse