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Post by SKR on Sept 2, 2013 7:37:03 GMT -7
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Post by dave632 on Jun 10, 2014 20:19:40 GMT -7
Why would you add more windings, that would slow you down? I also remember TV Tommy Ivo on the top of the page. I saw him run his twin Buick powered car back in the early 60s at a track in New York state.
Back then he had the blown Hemi cars covered easily. There was no nitro fuel allowed back then.
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Post by pceng on Jun 10, 2014 22:03:32 GMT -7
Hey Dave, not sure about the windings....... could be arm was rewound as dbl. wind. Two wires coming and going from every contact might appear as wire added...... or perhaps the wire added was of sufficient size to in effect lower the resistance of each pole...... only guessing......
The wires bonded from pick-up to brush contact are what we call shunt wires now........ shunts are used in all sorts of electrical motor applications........
The author referred to the car as highly modified......... HARDLEY modified would have been more accurate........ Cars I remember looked like swiss watches with the body removed....... wonder if I , would have the patience to build one again...... can just buy lightend CNC gears now.......took me about a week of using jewlers files to finish gears after drilling when I built one.......... A LONG TIME AGO !
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Post by dave632 on Jun 11, 2014 13:52:21 GMT -7
Yes he may have added larger size wire therefore reducing resistance even if he put more turns on the windings. I will start experimenting with some rewinds of my own as soon as I can figure out wire sizes. I was an electronics tech years ago so I have a pretty good understanding of electricity. The shunt wire makes a lot of sense, wherever you can decrease resistance in the feed line is a good idea.
I also understand reducing rotating weight under power makes a big difference. My Beretta had gun drilled 40 spline axles which weighed less than a regular 28 spline. I think the ratio was 4-1 when you compared rotating weight to static weight reduction. On the Beretta I switched to lighter rear rims and took out the inner tubes on my slicks saving about 28 lbs. This led to about a .1 in ET reduction, quite a gain for so little weight removed.
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Post by pceng on Jun 11, 2014 16:20:37 GMT -7
Hey Dave ,
I , also was a tech once. If you start rewinding your own arms 30g wire is when pancake chassis melt. Or 2 of mine did anyways........ to big & way to hot !
Shunt wires IMO, work best on pancake chassis . And braided wire works best for this. Not only because of flex, but because of the number of “paths of travel. T-jet type chassis as they are have one path - through pick-up and hanger plate and press fit (riveted) to brush contact. Shunt bypasses hing and adds atleast 1 more path or more (braid).
X-traction type, 4g's have a cup for spring, second path but only to hanger. Still press fit to brush contact. Soldering plates together is an option.
Inline chassis with bulkheads that have no brush tubes can also benifit from shunts........ those with brush tubes & a spring that also goes on tube have 2 paths of travel, 3 if a dbl. spring is used.
Paths of travel also help drawing juice from the rail if braids are soldered to pick-ups......
Recent races brought this to my attention again.......... I have 2 MM/PS cars..... both G3's......... one with shunts & pre-tweeked G3 bulkhead........ the other with no shunts (or advanced timming) & a T - bulkhead with brush tubes......... The car with no shunts is the faster of the two, by .03 (fastest times for ea.)......... ran a .3665 at 39+ mph last race.......
You also.mentioned weight reduction, hollow ss, & titanium axles are available......... tire width is another way of reducing weight...... traction magnets help cutting down on the extra rubber..........
........ Peter
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Post by dave632 on Jun 11, 2014 19:54:55 GMT -7
Thanks for the info Peter. I will look into all those mods and I will learn as I go along.
That is an exceptional time and speed, what volts and amps were put to the track to achieve those times and what was the track length?
I will have to look for some rewind wire smaller than #30. Who sells that wire if you know?
I have also noticed that taking the traction magnets out of some of the 4 gear cars allows them to run a little quicker ET as the MPH is higher. The magnets would allow a quicker start but the car without the magnets would pass up the one with them. I would think as tire spin increases this might not be the case any more. Most of my 4 gears are pretty pathetic losing to my quicker modified T jet cars.
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Post by pceng on Jun 11, 2014 22:54:11 GMT -7
Not sure of exact lenght..... think 15' 7"........... 2 car batteries for power..... amps galore, 25ish on the volts........
Not sure where to get wire, have not done any rewinds for a few years other than occasionally on a whim......
I think most are using one t/mag in the 4g classes........ intresting thought for the stock classes though....... going to give that a try.....
As for 4g's vs t-jet types. If all were equal, motor-magnet wise. My money would be on the jet....... IMO, 4g's need more work than any other chassis to reach race ready status........
.............. Peter
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Post by dave632 on Jun 12, 2014 13:28:33 GMT -7
2 car batteries for power wow, that is enough to fry any car that is not properly prepared. Like you said there is no shortage of amps there.
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Post by SlotWerx on Jul 28, 2014 20:19:06 GMT -7
This is how many of mine and my brothers cars looked.
I really want those wheels!
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Post by dave632 on Jul 29, 2014 7:19:18 GMT -7
This is how many of mine and my brothers cars looked. I really want those wheels! Not sure what you are referring to. |
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Post by SlotWerx on Jul 29, 2014 8:31:33 GMT -7
This is how many of mine and my brothers cars looked. I really want those wheels! Not sure what you are referring to. The original post and article. |
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Post by Eagle Racing on Jul 29, 2014 9:00:32 GMT -7
Hey Matt, that article shows several different wheels. I am going to guess and ask are you talking about the wire spoke front engine dragster wheels? If so Johnny Lightning T-bucket roadster die cast HO scale have them. They are just hard to find. That would be a challenge to design and 3D print those type wheels. I may just look into it, might be out of my league but maybe not.
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Post by SlotWerx on Jul 29, 2014 10:27:37 GMT -7
No the Keystone / Crager looking ones on the Galaxie XL 500
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Post by pceng on Jul 29, 2014 11:13:17 GMT -7
Hey Matt , just saw the kids names in another post...... hope all three of you get back to racing with us soon......... good to see you back !
If I send fake ID for the kids , will they register ? ........ lol. Oct. race has special prizes for NTRA Members in Waiting....... hope we see you there.
.......... Peter
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Post by Eagle Racing on Jul 29, 2014 11:21:40 GMT -7
Oh okay Matt, I already do a 5 spoke Keystone/Cragar look wheel. Look on Blacktop Raceway thread under clubs and on page 38 or in that area should be a pic.
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