Rowley's 1/4 mile and the Magic Tube .

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like a moth flying in toward a gas fired Coleman lantern at dusk. He just can't resist the temptation to leave it alone.
CNN
 
OK, do recall that chart now, with a bit of (serious) memory jogging.
Still a little flawed, even with needings amendments. ?
Which we see finally..

Firstly, if the pilot jet is a 25 and the main jet is say a 250,
then the main jets 'efficiency' or 'effectiveness' or call it what you will,
is that the main jet is 10 TIMES BIGGER EFFECT than the pilot jets effect.
So why isn't it drawn like that - ITS NOT TO SCALE.
Maybe minor, but for something like this it wouldn't have been difficult to do correctly to begin with.

Nextly, in real life, all of those effects are stacked on top of each other.
For clarity, they have been spread out to show each one individually.
But, why aren't they spread out in any order, seems quite random.
If the pilot jet is shown on the bottom, then the main jet should have been up top.
And the effects of each component contributing towards full throttle effects shown in turn up from the pilot jet.
Cutaway, then etc etc etc.
Again only minor, but still a flaw.

And for Ludwig, if he is still here, the cutaway spray tube at full throttle - if its a leaning affect it does - should be shown as an empty/blank square on the full throttle margin in the main jet effect - since it can only be taking from the main jet effect at full throttle.
If its an enrichening affect, then the main jet effect is just wider, IF DRAWN TO SCALE (?)

So maybe this chart needs to be reconstructed for cutaway spray tubes for throttle openings - one chart doesn't fit all ??
 
needing said:
That is why so many people complain of carbon fouled plugs.
Click to expand...

While it is certainly true that Amals are set to run rich-ish at lower rpms in Nortons (that was always Nortons way of having them set up),
its not so certain that its the sole cause of black sooty plugs these days ?

There is a lot of chitchat that modern fuels contain at least some quite heavy fuel fractions, to suit fuel injected thingies.
This doesn't necessarily burn too well in carburetted vapour sprayers, and makes for black sooty plugs.
I know that LAB won't take this as scientific evidence, but there does seem to be some merit in this suggestion.
Engines running leaded fuel (& avgas) don't seem to show this sooty stuff - but such fuels are no longer available, or legal. (mostly).
??
 
Rohan said:
needing said:
That is why so many people complain of carbon fouled plugs.
Click to expand...



There is a lot of chitchat that modern fuels contain at least some quite heavy fuel fractions, to suit fuel injected thingies.
This doesn't necessarily burn too well in carburetted vapour sprayers, and makes for black sooty plugs.
I know that LAB won't take this as scientific evidence, but there does seem to be some merit in this suggestion.
Engines running leaded fuel (& avgas) don't seem to show this sooty stuff - but such fuels are no longer available, or legal. (mostly).
??
Click to expand...

There is also a lot of chitchat about the lack of lead and 10% ethanol gas in general that makes plugs harder to read these days. And that even a too rich mix will still produce a pretty clean looking plug. A few years ago I was mixing 107 leaded race gas roughly 1 pt. to a 3gal tank and the plugs started looking a nice olde timey grey and so did the exhaust pipes. When I first bought my MK3 in '75 I took a trip from Colorado to Mass. With a lot of high speed time on the trip I remember the sides of the actual black caps at the end of the mufflers being totally coated with a light grey deposit, the sign of the perfect mix. On a side note though, it dropped a valve at a total 5000mi just 50mi from my destination.

My plugs now are quite white but with absolutely no sign of melted electrodes or any deposits on the insulators. I think a lot of black plugs these days are because of some oil usage and not necessarily a too rich mixture.
 
Biscuit said:
Probably gonna go "DOH" after this question . In the chart, on the far left "I.M.S." is overlapped on "air screw slow jet". What does "I.M.S." represent?
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I.M.S. makes more sense to me as 'Inlet Manifold Spray'.
This is through the pin holes with the throttle slide fully closed and drops off in the first mms of slide opening (just as the chart shows).
Ta.
 
Oh damn, I got my last question wrong. I looked back at the chart and what I meant to say was 'I.M.S.' overlaps 'THROTTLE VALVE CUT-AWAY' not the air screw jet.
Wondering if there is significance to showing it like that as there appears to be room on the chart to stick 'I.M.S.' in it's own space or even add a bit more vertical size to the chart in the first place.
 
ludwig said:
He finally planted his claws in it .
Time for me to leave .
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glad I archived the info before it vanished. I knew it wouldn't last long.
 
Another great thread ruined by someone going back over their past posts and deleting the content.

@Jerry is there a forum setting that you can enable to stop people from doing this?
 
gtiller said:
Another great thread ruined by someone going back over their past posts and deleting the content.

@Jerry is there a forum setting that you can enable to stop people from doing this?
Click to expand...

gtiller,
Its too bad that you weren’t around when this post first started. It had a warning at the beginning to a specific individual to not comment here. The original poster gave the hijacked version with the same name over to this individual and those who take a thread and send it on a south bound train (to derail the original thread). They take it over to this
rowley-400-and-the-magic-tube-hijacked-version-t22835.html
The original poster did exactly what he said he would do. Do you blame him? :?
Thomas
CNN
 
Since this one now about forum etiquitte rather than carby spray nozzles I will pass on a handy hint derived from experience. If you use the 'Troll' button then you can't see the posts from that person and can better stay on your topic. As foolish or belligerent as they may get (even resorting to posting by proxy), only the other forum readers need tolerate them. Un-Troll them ocassionally, just to validate your original decision.
Ta.
 
gtiller said:
Another great thread ruined by someone going back over their past posts and deleting the content.

@Jerry is there a forum setting that you can enable to stop people from doing this?
Click to expand...

i also find the current site settings very problematic, in that a disenchanted poster or anyone, can for whatever reasons, delete their postings at will, and i mean big time, which amounts to an attack on a site and its members, destroying threads and info, some that can be of very high value and even ruins the efforts and contributions from others,

some sites have a 'time frame' after which postings cannot be either deleted or changed, say 5 minutes

other sites you post it & that's it, i've seen all sorts of deals so there are surely some options and decisions made as to status quo

also, easy enuff to bypass and not even look at what someone has to say if finding someone else's postings of any concerns,
 
Changed time editing to 24 hrs for post edits and deletes, otherwise its now not possible.

Cheers- Jerry
 
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