20 replies to this topic

[hiline2]

Saw this a while back on ePay.
 
From way back, curious as to the claims on the card saying 150K RPM!!
 
Not impossible I guess but what of the heat?

[MSwiss]

Pretty lofty claim for a motor that old.
 
A modern G7 motor hitting 90 MPH in the bank is turning approximately 188,000 RPM.

[Bill from NH]

Lenz worked with Mura building motors. Their arms were CCW at the endbell. The Lenz brothers were also involved in thingie racing on some of the highly-banked tracks in the SF Bay area. I don't know how accurate the RPM claim is, but the motors were fast in the day.

[tonyp]

Everything was lies back then for sales. No one who bought the stuff had any way to test it so it was all fun and games.

[jimht]

The card doesn't mention voltage; maybe they measured for a second or two on 36 volts before it blew up.

[don.siegel]

This one says 150k too, but even at the 22v listed if you look at the bottom axis, that seems even more unlikely! 
 

 
PS: By the pitch test, just running some of my old motors, sounds like the U-Go had the highest free-running RPM.

[Lone Wolf]

If that Ram motor pulls 150K R.P.M. I would vote for Hilary Clinton.

 

Both are impossible in my lifetime

 

Oh, at 22 volts it's gone alright, right into the garbage pail.

 

P.S. sounds like the guys at the track when I used to drag when they said they shifted their big block Mopars at 12,000 R.P.M.

[John M Wimett]

The described motor above went for $133 on eBay yesterday, I hope it is fast, but could you afford to put it in a car to find out.

 

Is this the kind of high dollar stuff that ends up in the LA Museum?  Or does it sit in someone's closet for the next fifty years.

[havlicek]

Like Tony said...nonsense, but fun nonsense from a modern perspective.  The motor appears to be the earlier version with the brushes running directly on the end bell plastic, and the wind doesn't "look" all that beefy by the size of the wire (?).  It's not clear from the angle of the arm or the card if it's even balanced, and I guess it still has the original Mabuchi commutator and certainly the original magnets.  Then again, it wouldn't have to be all that fast to have been seen as "blazing" compared to the stock motor!  

 

-john

[don.siegel]

That's what I thought too John - I couldn't see the brush holders very well, but the wire certainly doesn't look very big - and it better not be if the brushes run in plastic! 

 

Normally all these early rewinds were balanced, maybe just not on the pole we can see. 

 

The lack of super-magnets may have actually helped the rpm figure, but I still don't see a 36D doing anywhere near 100K, much less 150K! 

 

Don 

[havlicek]

Hi Don,

 

     Yeah, I guess (?) that maybe it's a #29 wind, more likely a #30, but you never know.  I've seen some ridiculously hot winds in some of these old rewinds.  Until the Arcos, I'm not aware of any commonly-available better magnets for the 36D motors either, and same *probably* goes for the coms until the Champion and Tradeship coms were available.  

 

-john

[Champion 507]

Rewound Russkit 33. If you were lucky, this one would have a green Mabuchi comm instead of the brown one. I have one but it's not as nice as this one.

 

Bob Lenz must have been a Ford guy. He called his 16D rewinds Lenz 289s, the 26D rewinds Lenz 390s and the 36D rewinds Lenz 427s.

 

His 16D and 36D rewinds were mostly Russkits with the cans being painted metallic blue right over top of the Russkit gold. Mine even has the metallic blue over spray on the edges of the magnets near the rectangular cooling holes. It usually didn't take long for the blue paint to start pealing off and thus revealing the gold below.

 

The early Muras were the same way too. Theirs were also Russkits but Mura's were painted a light metallic green that also flaked off pretty quickly revealing the gold "primer" underneath.

 

150,000 rpms?     

[SlotStox#53]

Looks like Lenz and the guys who did the "Howkill" rewound motors chose a similar blue to paint over the Russkit gold motors

[Bill from NH]

The Howkills I saw in the 60's were sprayed blue, but they left the ends of the cans gold. Wound on the north shore of Boston, I never owned one but I saw plenty of them run. They either ran like a raped ape or blew up quickly, about 50% of each.

[Champion 507]

In post #2 above, Mike Swiss said

A modern G7 motor hitting 90 MPH in the bank is turning approximately 188,000 RPM. 

 

Ever since I got to watch warmup races in 2003 leading to the 2004 NATS in Tulsa, OK, I have wondered what kind of rpms these modern open motors are turning. Mike, based on 90 mph in the bank, appx what kind of lap time would a car be turning at that speed?

 

Certainly it couldn't be faster than my 1965 K&B Challenger I had 51 years ago     Just about THE most disappointing slot car I ever owned!!!

[zipper]

@ 90 mph a King would be ran in 1.174 secs.

[Tim Neja]

That's not considering you do slow down in the turns! 

[MSwiss]

FWIW, the time I saw 90 MPH in the bank, was with a radar gun, at the Jackson 500, and was back when the cars were running, a bit above, or a bit below, 2 seconds flat.

 

The cars are going way faster in the turns these days, but if I had to make a guess, I would think with lap times in the high 1.3's, like on the Czech track, the cars are probably hitting 100MPH, which is probably about 200,000 RPM, or a bit more, depending on the exact gearing.

 

IOW, I'm not sure if they have gone to a lower numeric ratio.

[zipper]

9/38 I'd guess but I'm not sure.

[MSwiss]

When I left G7 racing, guys were starting to use 72P for qualifying.

 

Regardless, that 200,00 RPM figure should be pretty close, not that it really matters.

[NSwanberg]

Try this.

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