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post #1 of 49 (permalink) Old 01-27-2017, 07:37 PM Thread Starter
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Rocker arm ratios

I'm miles away from my bikes for another two months and trying find info on rock arm, cam followers. I am wondering whether the 1000/1100 arms have the same ratio as the 1200's. All I can do is look at pics on eBay. Parts fiche don't reveal much. Pics are taken from different angles. Anyone know this data?? Or if anyone has boxes of loose parts, just hold the two up against each other. You'd be able to tell if the 1200 arm is longer than the 1000/1100 arms.

Thanks in advance for any replies.

Eric
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post #2 of 49 (permalink) Old 01-27-2017, 07:59 PM
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What are you trying to achieve?

Advise given here is free and comes with no warranty "Caveat emptor"

Ken.
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post #3 of 49 (permalink) Old 01-27-2017, 10:19 PM
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I doubt you could put 1200 rockers on your heads anyway.

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post #4 of 49 (permalink) Old 01-27-2017, 10:29 PM
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Quote:
Originally Posted by DaveO430 View Post
I doubt you could put 1200 rockers on your heads anyway.
He has both a GL1000 and a GL1200.
Until he coughs up more information we have no idea where he want's to go with this.

Advise given here is free and comes with no warranty "Caveat emptor"

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post #5 of 49 (permalink) Old 01-28-2017, 12:09 AM
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Aren't the 12's hydraulic vs adjustable on 1100. different birds altogether.
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post #6 of 49 (permalink) Old 01-28-2017, 12:18 AM Thread Starter
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Cough, cough, I plan on trying 1200 cams in my hybrid with 1000 heads. The 84-85 had double the overlap of the other years. I have a top mounted tank and front crank mounted ignition so it is fairly easy for me, as it would be for 1100's if you installed an electric fuel pump.

They're just numbers, but the pretty significant increases in both hp and torque of the 1200 have perplexed me. 15% more on each. The 100 ccs extra on the 1100 didn't make that big a jump. People have always pointed to the smaller valves, smaller intake runners as part of the reason, but if the rocker arms were longer, the 1200 may have had more valve lift than the 1000's. Their breathing ability has been attributed to speed of the incoming charge.

I will be using the 1000 rocker arms because the 1200's don't have the adjuster on the one end. Just curious about them.

The 1200 cams had a larger base circle so regrinding them would be safer/stronger in this application.

Thanks again for any info anyone might have.

Last edited by Ekvh1; 01-28-2017 at 12:19 AM. Reason: Add info
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post #7 of 49 (permalink) Old 01-28-2017, 01:19 AM
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Whenever I've looked at parts and their interchangeability, I've compared part numbers. Honda was pretty good at using identical parts on different bikes. When they improved one, they superseded the part number at the end with a dash. Higher the number, the more times it was changed.

After that, about the only other suggestion is to bite the bullet and buy a used one. Once in your hot little hand, you can compare them.
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post #8 of 49 (permalink) Old 01-28-2017, 02:26 AM Thread Starter
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As stated above, I'm 10000 miles away for two more months, and I intend to enjoy every minute. In the Philippines right now and I won't see any Goldwing parts here. When I get home I will be able to check myself, and my plans are pretty well set.

I am just curious about the differences as mentioned above. Amazingly, most anything you can ask gets answered by some knowledgeable person her, so I'm just seeing what everyone else knows.
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post #9 of 49 (permalink) Old 01-28-2017, 02:57 AM Thread Starter
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I just found some better pics to compare and measure and the 1200's seem to be 1.3 to 1.4:1 and the 1000's seem close to 1:1. That would be a huge difference and the stock 1200 would have a large valve lift than the 1000's.

The 1000 valves will kiss the piston when you put them on the 1200, but I'm starting to think the reason they hit was the valve reliefs weren't designed for 38mm valves. They are cut for 36 mm valves. I believe the 1200 valve faces come in closer to parallel than the 1000 valve faces.

If this is true, installing the 1200 cams in the 1000 heads will still be only 1mm less valve lift.

Comparing manual data, the cam journals are the same. I have one reference from a person saying the base circles were larger on the 1200, but no numbers. If the base circle is bigger, then the 1200 cam had less lift than I am figuring, but maybe the rocker ratio brought it back some. Wouldn't this be more in keeping with hydraulic valves? Less actual lift, less motion of the cam end, but using the ratio leverage to accomplish the valve lift.???

Feel free to totally ignore me, too.
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post #10 of 49 (permalink) Old 01-28-2017, 06:25 AM
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You are probably aware that Dan Filipi on classic wings put 1200 cams in an 1100. I didn't follow it to find out what the end result was.

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