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Aug 21, 2008 | 07:35 PM

#21

68/70Vette

Team Owner

Joined: Jul 2004

Posts: 40,412

Likes: 792

From: Redondo Beach, California

Quote:

Originally Posted by 69Vett

Sorry, surely you don't beleive everything you read on the Internet.It is phsyically impossible for it to be a Gear Reduction.
you have to have room for the gears, (Gear Reduction)
wish requires the motor to be offset from the drive shaft.

Weight: 8.5 lbs.

While I don't believe everything on the internet (or anywhere else), I would like to point out that I referenced PowerMaster's own advertisement and technical description.

Furthermore, it would be quite easy for the motor cylinder axis and the drive gear to be on a common axis and still be a gear reduction motor. If it used planetary gears, the axes of the motor and gear drive would be the same; i.e. in a straight line - just as the picture of the starter shows. There's nothing exotic about planetary gears - they are used in all automatic transmissions and were used in Ford Model T's.

This starter looks exactly like the GMPP ministarter for 502 engines and it too is described as a gear reduction starter.

Anyhow, I have the GMPP version of this starter, but I'm not going to take it apart - I prefer to believe that PowerMaster and GMPP are both accurately describing this starter as a gear reduction starter.

Last edited by 68/70Vette; Aug 21, 2008 at 07:39 PM.

Aug 21, 2008 | 09:41 PM

#22

b71vette

Burning Brakes

Joined: Jan 2004

Posts: 1,043

Likes: 4

From: Va

ok , I've done some more research, these permanent magnet gear-reduction starters use planetary gears which allow the armature shaft and drive gear to be on the same axis, they do not use "OFFSET GEARING". I looked up planetary gears on wikipedia to see how they were designed. please take a look and you can understand how the armature shaft and drive gear can be on the same axis. It just looks like a mini OEM starter, but the newer technology/planetary gears is what enabled the gear reduction.

http://en.wikipedia.org/wiki/Planetary_gear

Aug 22, 2008 | 08:13 AM

#23

pws69

Melting Slicks

Joined: Nov 2001

Posts: 2,668

Likes: 43

From: Eastern US XX

Welcome to the world of Planetary Gearing......

Well done "b71vette"

Quote:

Originally Posted by 69Vett

Sorry, surely you don't beleive everything you read on the Internet.
It is phsyically impossible for it to be a Gear Reduction.
you have to have room for the gears, (Gear Reduction)
wish requires the motor to be offset from the drive shaft.

**** take it apart, you will find 1 shaft, no gears.
These use the the words, but it should read~

"4.4:1 Gear Ratio"

Permanent Magnet Delco Starter
Clears All Headers
"4.4:1 Gear Reduction Ratio"
Cranking Power for up to 10.5:1 Compression
Mounting Bolts Included
Dyno Test Results Included
Weight: 8.5 lbs.

Aug 22, 2008 | 08:43 AM

#24

69Vett

Safety Car

Joined: Oct 2007

Posts: 3,729

Likes: 267

From: Austin Texas

Corvette of the Year Winner 2017

2016 C3 of Year Finalist

I see that now, thank you for pointing out the plantary gearing, I was not aware of starters being manufactured this way.

Aug 22, 2008 | 09:23 AM

#25

61 vert

Instructor

Joined: Nov 2007

Posts: 196

Likes: 0

From: Iowa

Shims

To avoid shimming and starter engagement aligning issues, ALWAYS reuse the original nosehousing when possible when dealing with the small block chebbie.

Aug 23, 2008 | 12:27 AM

#26

b71vette

Burning Brakes

Joined: Jan 2004

Posts: 1,043

Likes: 4

From: Va

Quote:

Originally Posted by pws69

Welcome to the world of Planetary Gearing......

Well done "b71vette"

pws69 Thanks for the compliment. I have been curious ever since I had this starter and how it accomplished the gear reduction. This thread put me over the edge and caused me to dig and find the answer.

Thanks to 68/70Vette he mentioned this starter may use planetary gearing which gave me the lead on getting to the bottom of this.

Check out this link it gives some details on the design and also a diagram of the internal parts. this is a Ford Starter but the Chevy is the same design but with different mounting set-up. click on the full view of the schematic on the second pic and you can see the internal parts that make up the Permanent Magnet Gear Reduction Starter.
Google Search is priceless!!

http://www.fordmuscle.com/archives/2001/08/ministarter/

Sep 1, 2008 | 01:05 AM

#27

jimbux

Heel & Toe

Joined: Aug 2008

Posts: 16

Likes: 0

Whatever you do, if your starter is OEM, be sure to KEEP it. I have a 1969 and recently put back in my original starter -- many aftermarket models simply won't fit !!!

Sep 1, 2008 | 07:41 AM

#28

jb78L-82

Le Mans Master

Joined: Oct 2007

Posts: 7,455

Likes: 977

From: RI, Now Franklin/Nashville TN

Quote:

Originally Posted by FB007

The same one. Just get $4.00 worth of brushes from NAPA and rebuild it yourself. A monkey can do one in 2 hours.

I had my original starter rebuilt by a machine shop about 15 years ago and it has worked perfectly since then for $50. No heat soak issues either. I may do it myself the next time with the new brush kit from NAPA as well. I would keep the original starter! Save your money and keep it original, if possible.