Needing Air

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Dear rohan?
1. Do you have a Norton Commando?
2. If yes, does it have AMAL carbys?
3. If yes, are stepped spray nozzles fitted?
4. If yes, do the plugs foul from excess fuel at smallish slide openings?
5a. If yes, have you trialled flat top spray nozzles to assess the difference?
5b. If yes, have you trialled a larger/smaller slide cutaway to assess the difference?
6. If no to any of the above, why so concerned (you could be an extremely happy person)?
Ta.
 
needing said:
Dear rohan?
1. Do you have a Norton Commando?
2. If yes, does it have AMAL carbys?
3. If yes, are stepped spray nozzles fitted?
4. If yes, do the plugs foul from excess fuel at smallish slide openings?
5a. If yes, have you trialled flat top spray nozzles to assess the difference?
5b. If yes, have you trialled a larger/smaller slide cutaway to assess the difference?
6. If no to any of the above, why so concerned (you could be an extremely happy person)?
Ta.
Click to expand...

All we can go on Owen is what you have posted, and the words therein.
Yes I have a Commando, and no I cannot see where you have actually tried what ye speak about,
nor where you have posted any actual results of these particualr trials.
The words only seemed to be saying you were going to do some testing.

Point me to precisely where you have shown such desireable results.
Perhaps even repost the A/F charts to ram home the point, with some words to match/explain the results.
 
Very good rohan.
You have successfully answered question 1 (has a Commando!).
Please attempt question 2 next.
Ta.
 
I'm sorry Owen, we can only see and respond to what you have posted.

And if what you say doesn't seem to correspond to your shown results, where does that leave us ??

We are 27 pages into this, and none the wiser ??
 
Dear rohan.
Please don't be sorry - perhaps just have another go at answering question 2 i.e. does your Norton Commando have AMAL carbys (Mk 1 specifically)?
Ta.
 
Owen, or is that TA,
You tell me some posts ago to 'keep up', but there is nothing to keep up with.

If you have actually done this, show some results. ?
I have no intention to do your testing for you, if you can't and there is nothing to be gained.
 
Dearest rohan.
Nope. That's not the answer to question 2.
Please try again. Please select either [YES] or [NO].
I am confident that a person of such redoubtable intellect as yourself can accomplish this task if you really try harder.
Go on, have another try. Don't be daunted by your lack of success to date.
If you can successfully answer all questions then I may have an offer to delight you!
So, q2. does your Commando have AMALS Mk 1?
Ta.
 
Show some results, put your money where your mouth is,
rather than wasting our time with diversion tactics.
 
Oh dear rohan.
Wrong again. Pity.
It is to the bridge for you!
Goodbye.
Ta.
 
Can I try before I buy ?

You've got oddball mufflers haven't you ??
 
needing said:
Dear rohan.
Please don't be sorry - perhaps just have another go at answering question 2 i.e. does your Norton Commando have AMAL carbys (Mk 1 specifically)?
Ta.
Click to expand...

Don't tell him, Pike!
 
Rohan said:
OK, lets take a quick poll here to see who is serious about this breathing toxic stuff.

How many wear a mask while filling up at the gas station. ?
How many others do you see doing this.

Needing Air
Click to expand...


I shouldn't be able to see that bloke's chin, should I?
 
I wouldn't have expected his chin to be made of pink filter material either.
But I didn't take the pic.

Just goes to show....
 
My throttle twist housing and grip have been marked to indicate thottle slide opening (according to AMAL literature). The cutaway transition to flat-top spray nozzle and needle parallel also matches my findings from earlier in this thread.
Riding around in 4th gear, I noted (approximately) that:
60kmh = 2,500rpm
70kmh = 3,000rpm
80kmh = 3,500rpm
This equates to around-town speeds never really getting fully 'onto' the needle jet but utilises the pilot circuit almost exclusively.
To elucidate: The pilot circuit has its greatest influence at these revs but continues to provide air:fuel mixture throughout the entire throttle range. To restate, for those in any doubt of what I mean, each carby circuit does not switch off as the next is activated by increasing throttle opening. Progressive activation is up to wide-open-throttle when all circuits are then providing fuel to match the airflow.
Ta.
PS: I am currently running 2.5 cutaway slides (sourced from Atlas carbys).
Addendum 06-Sep-15:
As peviously noted on a graph, 105 needle jets are fitted.
A:Fr is around 13:1 across the throttle range.
Idle is stable at 1,000 rpm and slide seating is checked by removing the throttle slide stop screws.

PPS: the man in the mask is poking his tongue out. :D
 
Perhaps he removed the canister to sniff if the fumes were really that toxic ?
Not that we would ever recommend this...
 
needing said:
PS: I am currently running 2.5 cutaway slides (sourced from Atlas carbys).
Click to expand...

That would suggest you have really leaned it out, and have needed to rich it up - to get over a lean stumble down at low rpm maybe ?
Isn't that getting back towards where it was oem initially ??
 
Rohan said:
needing said:
PS: I am currently running 2.5 cutaway slides (sourced from Atlas carbys).
Click to expand...

That would suggest you have really leaned it out, and have needed to rich it up - to get over a lean stumble down at low rpm maybe ?
Isn't that getting back towards where it was oem initially ??
Click to expand...
Dear rohan.
Are you still stuck on question 2 i.e. do you have AMAL Mk1s on your bike? The answer to this question defaults to [NO] unless you can honestly state [YES] in any further posting.

From your statements with question marks attached (quoted above), your knowledge of AMAL Mk1s is appalling.
For instance, you alone seem to think fuel can be adjusted to suit cutaway controlled airflow. In reality, the throttle slide cutaway controls the airflow that draws fuel through the pilot circuit pinholes. By the time the throttle slide influences fuel draw through any adjustable source (e.g. needle jet) the throttle slide cutaway has no influence on that jet. I suspect your lack of understanding of basic Mk1 function may have caused you to fit another brand.

BTW:
7. why do you often use 'we' or 'us' when 'you' are making a statement?
8. why do 'you' add question marks to your statements?
Ta.

PS: addendum added to yesterday's post.
 
needing said:
I suspect your lack of understanding of basic Mk1 function may have caused you to fit another brand.
Click to expand...

You gotta tell ya, there needing, this thread isn't exactly creating confidence in Amal MK1, only needless confusdion.

Sorry LAB, but when is enough enough. A lot of unsuspecting newcomers are reading this garbage.

I think we all need a little fresh air.
 
Your thinking is seriously flawed here Owen, on several counts.
I have utterly stock Amals, Mk1.
Gotta agree with pete on the needless confusion.
(My bike is currently partly in bits too, but thats beside the point)
(it seems the factory never fitted an alternator rotor nut to this bike !?)
(this bike is actually utterly stock in fact, IF I can get the alternator to alternate)

If you have reduced the slide cutaway, it can ONLY be to ENRICH the low rpm mixture at small throttle openings.
Refer to that diagram posted here many pages ago, that lays out each individual function laid out on a table, as it were.
Was it page 6.

I put a question mark after some statements, because WE (the Readers) have no idea precisely of what you are doing,
you simply don't spell it all out in enough detail for each step.
How did you arrive at REDUCING the stock slide cutaway ??
Perhaps my memory isn't good enough for me to guess/remember where we are each stage,
but good science shouldn't rely on memory, it all needs to be thoroughly written down, so there is NO ambiguity.

I have no intention of modifying said amals, based on your say so, your fuzzy logic just isn't good enough at this stage for me to be tempted.
Especially since the A/F ratio chart for what you have done isn't viewable to compare results.
AND, you have some oddball mufflers, so we have no idea if they are applicable to a STOCK Commando peashooters.
I cannot see a ride report comparing mixture settings recently in this thread, so what are we supposed to think ?

Sorry to be blunt, but we are blundering in the dark here somewhat - at least I am, as a reader anyway.
Maybe everyone else has a crystal clear vision of what ye are doing - let them speak ...
 
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