GL1000 to GL1100 motor ...Gearing question/ cam/ carbs - Page 3 - Steve Saunders Goldwing Forums

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post #21 of 47 (permalink) Old 09-25-2016, 08:06 PM Thread Starter
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Location: Little Rock, Arkansas, USA
Year: 1977
Make: Honda
Model: GL1000
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Quote:
Originally Posted by Ken Bergen View Post
I went over the numbers again and I was a little high, it should have been about 4,600 RPM.

The fifth gear of 0.829 is for the 1983 with overdrive. Is that what you have?
You're also missing the secondary reduction between the transmission and engine output.

Try these numbers
Fifth X Final X Secondary

GL1000
0.939 X 3.4 X 0.825 = 2.634

GL1100 80-82
0.909 X 3.4 X 0.973 = 3.007

GL1100 83
0.829 X 3.4 X 0.897 = 2.528

I have a copy of the gearing spreadsheet Steve (SuperSkypilot) made when doing the B-Girl which makes it easy to change ratios and see what happens.

Private Message me with an email address if you want a copy.
I have to admit after you posted that I had to do some research, what I found, (I admit going to one website only) was you multiply the Primary X the Secondary X the Gear x the Rear end / final drive ratio

At first these numbers seemed wrong BIG TIME then I thought about it a 3.08 rear gear in a car last I remember was no where NEAR 4K rpm at 70 so I started playing with it.... yea these numbers make more sense for the GW to be turning the RPM it does with the final drive it has.

Primary reduction ratio: 1.708
Secondary reduction ratio: 0.825
First gear ratio: 2.500
Second gear ratio: 1.708
Third gear ratio: 1.333
Fourth gear ratio: 1.097
Fifth gear ratio: 0.939
Final reduction ratio: 3.400

1.708 x .825 x .939 =
1.323
x 3.4 = 4.5

which seems to corrilate to my RPM rather close at 70MPH with a 25.8 " (calculated) tire Dia

68mph at 4K vs 65 at 4K calculated

so yea it will be higher thanks for the info I learned something.

and found out something I DIDNT WANT TO KNOW

thanks again
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post #22 of 47 (permalink) Old 09-25-2016, 09:17 PM
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Tire size has to be figured in as well. Stock 1000 tire, 130/90/17 is 26.21". An 18" Lester gets you to 27+" depending on what you can find.

My 1200 in a 1000 was around 4100 at 70mph with an 18" Lester and didn't seem to mind. It was just too responsive in first gear. When I was riding two up, I took off in second.
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post #23 of 47 (permalink) Old 09-25-2016, 10:09 PM Thread Starter
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Quote:
Originally Posted by Ekvh1 View Post
Tire size has to be figured in as well. Stock 1000 tire, 130/90/17 is 26.21". An 18" Lester gets you to 27+" depending on what you can find.

My 1200 in a 1000 was around 4100 at 70mph with an 18" Lester and didn't seem to mind. It was just too responsive in first gear. When I was riding two up, I took off in second.
Tire size was figured in....
Quote:
which seems to corrilate to my RPM rather close at 70MPH with a 25.8 " (calculated) tire Dia
Im running a 16" lester 130/90/16 Bridgestone says its 25.4" but 25.8" made the calculations pretty close for my "indicated" RPM at my "indicated" MPH.

Regardless Im gonna be reving higher cause Im not changing wheels and tires any time soon.... well unless someone has a SWEET deal on a 18" lester they wanna give me

will a 1100 rear wheel direct swap to a 1000?
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post #24 of 47 (permalink) Old 09-26-2016, 06:43 AM
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No direct swap of wheels of final drives. You can pick up a few tenths by going to a 140/90/16. I think these motors will run 5k all day long.
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post #25 of 47 (permalink) Old 09-26-2016, 07:35 AM Thread Starter
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To be absolutely honest I think the motor will have less of a problem with it than I will, I just dont like looking at the tach pointing at 5K for hours, my exhaust is not stock, looks like the PO put mufflers like you would find on an old 4 in 2 bike on her and she starts getting LOUD at 5k. Thats probably a bigger problem to my ears than it is to the engine.
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post #26 of 47 (permalink) Old 09-26-2016, 07:49 AM
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Garage
switching bike models on you.

I have ridden my '94SE for many miles screaming constantly between 5000 rpm and Redline.... never letting it get below about 5000 rpm. That is a motor that turns at 3000 rpm for 65 mph.

at the time, I was "racing" a Ninja crotch rocket rider up a mountain..... that flat six did not even seem to care.... it just happily turned the RPMs on and followed that little bike right to the top of the mountain... you are not going to hurt a 4 cylinder with RPMs... it is the "grey matter" between our ears "that hurts"

That Ninja rider, kept looking back to see if he had out run that 1000 lb touring bike yet
nope, I pulled into the restaurant at the top about 10 seconds behind him...

~ John


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post #27 of 47 (permalink) Old 09-26-2016, 08:12 PM
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Swapping an 1100 swing arm to a 1000 can be done with some modifications.
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post #28 of 47 (permalink) Old 10-03-2016, 11:56 PM Thread Starter
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OK GL1100/1000 wing is now running... GL1100 engine, 1979 GL1000 cams, carbs, and ignition.

Gonna put a thread up with pictures so anyone that wants to do this swap will have an Idea what they are getting into.

NOW I need to figure out how to time the ignition on this thing. Do I time it like a 1000 since that is the ignition, cams and carbs or like the 1100 since thats the Cubic Centimeters ......or pick a middle point?

Slow to crank when hot so Im hoping a little timing will change that
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post #29 of 47 (permalink) Old 10-04-2016, 12:07 AM
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Originally Posted by Larrys1911 View Post
Do I time it like a 1000 since that is the ignition, cams and carbs?
Yes.

Why ain't we ridin'?
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post #30 of 47 (permalink) Old 10-04-2016, 07:11 AM
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79 was timed 10 degrees BTDC. The 1100's had different marks. The early ones were 13 degrees??? And later ones were 10 degrees. I'd go with ten degrees.

You will have a detuned 1100 with the 79 cams in there. I know you need them for ignition, but 75-77 cams have more lift and duration.
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