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BlazingSaddle
Joined: 13 Sep 2004 Posts: 8 Location: San Pablo, CA
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Posted: Sat Jan 15, 2005 9:36 pm Post subject: Amal 930s in place of 932s on Commando 850 |
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I understand that running slightly smaller carbs, Amal 930s on a '74 Commando in this case (originally spec'd with 932s), will produce more torque. At 36K miles, I was due for a new set, so I'm trying it out.
With the carbs I had to replace the manifolds (30/30). I have a RH10 head (30mm).
I'm working out the adjustment kinks now. Has anyone experience doing this? I could use some advice on adjustment, if the jets need to be changed, etc.
Art |
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illf8ed
Joined: 30 Dec 2003 Posts: 474
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Posted: Sun Jan 16, 2005 8:24 am Post subject: 930 Amals |
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Hi Art,
I have not heard that one, only that the tapered intake from 32mm to 30mm of the RH10 head did increase torque. Don't get rid of the 32mm Amals. They can be resleeved to better than new.
Your a local if in San Pablo. Are you a member of the Northern California Norton Owners Club? At last Thursday's meeting I volunteered to lead a ride to "The Wall" starting in Pleasant Hill - Alhambre Valley Rd, Bear Creek Rd, Wildcat Canyon Rd to Grizzly Peak Rd. Check the website if you're interested... www.nortonclub.com |
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BlazingSaddle
Joined: 13 Sep 2004 Posts: 8 Location: San Pablo, CA
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Posted: Mon Jan 17, 2005 1:11 am Post subject: Amal 930s in place of 932s on Commando 850 |
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Well ... based on your reply and the fact that there are no others, this might be interesting new ground then. I've gone ahead with this experiment. I bought the carbs last week and installed them over the weekend. Although I won't have true analytical data to share, there'll be a thread of anecdotal info for those interested.
They're idling nicely, but a little rough out of the gate. Some tweaking to do yet.
Thanks for the invite to join the Northern CA Norton Owners Assn. I actually met up with the group on the 'Old Timers Ride' back in November (I think it was) in La Honda and I believe I remember seeing your bike. Your plate also reads Illf8ed, no? Your alias stands out for some reason. I had a great time and met some nice guys and gals. There are some beautiful Nortons out here in CA and as a newbie I'm happy to have gotten my hands on one (last Sept I bought my first Norton).
Art |
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illf8ed
Joined: 30 Dec 2003 Posts: 474
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Posted: Mon Jan 17, 2005 7:48 am Post subject: tuning for torque |
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Hi Art,
Yes, ILLF8ED is my license number, red '72 750 roadster.
Again, I haven't seen any strings about tuning specifically for torque. What may be more common, though, is using a single Mikuni carb rather than two 930 Amals. Finding a dynomometer would be very useful to sort out the carb setup. There are some around, but I don't have a reference of the top of my head. Too bad we're not closer to Dynodave, a major contributor to this site. |
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dynodave
Joined: 28 May 2003 Posts: 139 Location: USA
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Posted: Mon Jan 17, 2005 8:22 am Post subject: |
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Last edited by dynodave on Mon Apr 11, 2005 4:22 pm; edited 1 time in total |
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BlazingSaddle
Joined: 13 Sep 2004 Posts: 8 Location: San Pablo, CA
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Posted: Tue Jan 18, 2005 8:21 pm Post subject: Manifolds |
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Dave -
That's right ... 30x30 manifolds.
I got them from the shop that sold me the carbs and I don't know where they came from. They're not modified. But I can say that they appear to be the same in every way as the stock manifolds except for they are smaller.
Any experiece with this set-up? |
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dynodave
Joined: 28 May 2003 Posts: 139 Location: USA
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Posted: Wed Jan 19, 2005 8:10 am Post subject: |
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Last edited by dynodave on Mon Apr 11, 2005 4:24 pm; edited 1 time in total |
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BlazingSaddle
Joined: 13 Sep 2004 Posts: 8 Location: San Pablo, CA
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Posted: Thu Jan 20, 2005 12:01 am Post subject: |
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That's right. 30x30 with a sand cast finish.
I hope to have everything tuned this weekend. |
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bert Guest
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Posted: Mon Jan 31, 2005 7:10 am Post subject: 930 instead of 932 on 850 |
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Hello,
Your bike will probably run too rich with a 750 type 930 carb.
I would suggest you use the 850 type sectioned spray tube, the 3 1/2 cutaway slide and the long needle.
Cheers
Bert |
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BlazingSaddle
Joined: 13 Sep 2004 Posts: 8 Location: San Pablo, CA
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Posted: Wed Feb 02, 2005 1:03 am Post subject: So far so good |
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The 930s are up and running. Got 70 miles in last weekend and the bike is running great. I'll keep in mind your advice about richness.
So, more riding to do yet, and without real performance measurement it'll be impossible to really gauge real performance improvement, but for the archive: 930s are running great on an 850.
Another 70 miles today (a week later) ... starts in two kicks and fast fast fast |
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Norton Commando Forum by Corporate Pages Web hosting using phpbb
The Unapproachable Norton Commando
At the end of 1967 the Norton Commando was announced.
The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.
It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.
Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.
It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.
The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.