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Old 05-15-2017, 11:53 AM   #101
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Default Re: Project: NorField

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Good job
impressive stuff
width would be determined by long range or short?
or the width of your thigh/knee in your racing leathers?
Trying to decide the full width of the tank.
With legs tucked in against the tank the widest drawn section shown in the last two photos sits about 1/2" past the knees.

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The top profile looks just right. Not sure about hiding so much of the engine with the deep tank. Probably a matter of misperception (mine).
Still debating that too.
A quick photoshop:
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Old 05-15-2017, 12:17 PM   #102
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Default Re: Project: NorField

Your photoshop sucks
Make it wide
Then you can slipstream behind it


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Old 05-15-2017, 03:26 PM   #103
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Default Re: Project: NorField

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Your photoshop sucks
That's extent of my PS skills, a finger painting child, what the hell did you expect? Bob Ross?


Also, keep the tank wide, agreed.
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Old 05-16-2017, 06:23 PM   #104
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Default Re: Project: NorField

Were G50s/7Rs ever equipped by the factory with a short-circuit tank? That might be interesting to look at/crib from.

This is not to criticize. The bike is going to look great, I can tell.
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Old 05-16-2017, 07:49 PM   #105
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Default Re: Project: NorField

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Were G50s/7Rs ever equipped by the factory with a short-circuit tank? That might be interesting to look at/crib from.

This is not to criticize. The bike is going to look great, I can tell.
No worries dude, been staring, obsessing over this damn bike for far too long I start to get tunnel vision and neglect the BIG picture; opinions and suggestions from fresh eyes are very welcome.

Far as I know there was only one tank style, over the years reproductions have altered the size a bit, slimming down like Team Obsolete's (pretty sure this rider is super short, the knee cut outs...)



Enfield's frame is very tall, the top yoke sticks out like a sore thumb, with a low seat position a big tank is kind of needed to fill in the gap. A low tank helps with CG too.
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Last edited by thegreasepit; 05-16-2017 at 08:01 PM. Reason: picture
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Old 05-17-2017, 01:14 AM   #106
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Default Re: Project: NorField

I'm glad you weren't moved to paint the cases gold.
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Old 05-17-2017, 04:39 AM   #107
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Default Re: Project: NorField

That may have been a coating to protect magnesium castings.

Also, Dave Roper, the TO rider, is pretty tall. http://daveroperracing.blogspot.com/.../label/Gallery Scroll down about 30%.
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Old 05-17-2017, 08:26 AM   #108
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Default Re: Project: NorField

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That may have been a coating to protect magnesium castings.
It is. Probably Alodine, which is a chromate conversion coating, not paint.

Bob
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Old 05-17-2017, 11:31 AM   #109
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Default Re: Project: NorField

Huh. I'd read that AMC used plain old gold paint over the mag castings. Learn something new every day and immediately forget it.
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Old 05-17-2017, 07:34 PM   #110
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Default Re: Project: NorField

I think you hit the nail on the head with your assessment of your frame neck being very tall. It will be quite a challenge to design a tank that makes your bike meet cafe racer criteria without the tank looking heavy and cumbersome. You're right in keeping the bottom of the tank and seat on the same plane. The problem is your neck is so much higher than this plane that when you design the tank this way it makes the tank look thick and gives the perception that it is short. The bike you posted with the aluminum tank appears to have shorter fork tubes, a lower neck, a flatter backbone line , and taller suspension in the rear. The head light is also on the same level as the tank and seat. All that is why it "works" visually. I hate to say it, but I think you are going to have to raise the seat higher so you can raise the bottom of the tank, or lower the neck so you can lower the top plane of the tank. Of course you will have to shorten your fork tubes to do that. Lowering your headlight would be a step in the right direction. Please don't think I'm being critical of what you've done. I'm merely trying to help you get where I think you are trying to go. The angle of your backbone and relationship between the top of the neck and seat rails are remarkably similar to a Sportster frame. Which is what I've chosen to build into a cafe bike. I'm encountering the same problems you are having. Do I lower the neck or raise the seat? I'm honestly considering lowering the neck. I like low, fast looking bikes.
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Old 05-17-2017, 08:55 PM   #111
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Default Re: Project: NorField

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lots of words
Sounds like you understand the struggle too.
Modifying the frame is a last resort as the initial idea was to keep it mostly factory yet would solve so many problems, like bringing the neck down or replacing the square shock mounts to some simple loops and bringing the seat height up a bit. If the latter were narrowed by only an inch the seat would ride directly on the loops, same as the G50 or Manx.

Seems making a new frame is less trouble.



EDIT
After raising the seat up about an inch.





Thanks for the feedback guys.
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Old 05-18-2017, 10:13 AM   #112
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Default Re: Project: NorField

THAT looks so much better, can you bring the headlight down so the top of the light is on the same plane as the top of the tank?
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Old 05-18-2017, 07:01 PM   #113
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Default Re: Project: NorField

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THAT looks so much better, can you bring the headlight down so the top of the light is on the same plane as the top of the tank?
It's centered between both top and lower triple tree and looks pretty killer when viewed from the front, side profile not so much.
Dropping it down a few inches will place it just above the license plate, that would look odd.
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Old 05-21-2017, 12:28 AM   #114
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Default Re: Project: NorField

Been splitting up garage time between another project but got some progress on the tank before running out of filler rod.



Trimmed down the area around the knees. Sorry Richbob, it's a bit narrower than expected, kept trimming the edges down and was running out of material.





Came across something cool in the Royal Enfield Big Twins book:
custom Constellation with Manx seat and Goldstar tank, a conversion service done by an English shop in the early 60's



More progress next week.
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Old 05-21-2017, 09:57 PM   #115
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Default Re: Project: NorField

Is it next week yet?

Spent the better portion of today on the tank again. At this rate I'll pass the project on to my children's children to finish up.


This is turning into a slimmer sprint style tank instead of the big 5 gallon originally thought. Managed to find a few small remnants of filler to tack the side panel on.






I'm calling it an evening.
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Old 05-23-2017, 10:49 PM   #116
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Default Re: Project: NorField

Welp, I wasn't liking how the new side panel was turning out so another one was made, this time it has some super cool totally custom pinstriping too.




The hole near the neck is the factory rubber tank mount...for anyone wondering.




Better profile.





More progress when welding supplies arrive.
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Old 05-23-2017, 11:09 PM   #117
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Default Re: Project: NorField

...from the side the tank looks really good; good proportions. I do not like too much the oil tank (?) but seems that there s not so many options with that small space that you have.
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Old 05-23-2017, 11:20 PM   #118
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Default Re: Project: NorField

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...from the side the tank looks really good; good proportions. I do not like too much the oil tank (?) but seems that there s not so many options with that small space that you have.
The oil tank is pretty close to the factory style, just has cutout for the carburetors and has been narrowed.
Here's a Constellation with the factory tool box



Blame the frame, it's ugly as hell and doesn't allow much for anything. i think the engineers at Royal Enfield were huffing paint fumes all throughout the 50's.
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Old 05-24-2017, 03:03 AM   #119
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Default Re: Project: NorField

Right on.
Chop that steering damper down get it flush on top yoke.
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Old 05-24-2017, 11:00 AM   #120
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Default Re: Project: NorField

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Right on.
Chop that steering damper down get it flush on top yoke.
That's a good idea, I never thought to do that.


What about machining the top yoke down a bit? At 1.95" / 49.5mm thick she could stand to lose some material, but what's the minimal thickness and still be safe? 1-1/4", 1-1/2"? (32mm, 38mm)




Trimming down the top nut, damper, shaving 1/2" off the top yoke could bring the whole thing down about 1-1/2".



EDIT

Quick 'n' dirty 'shop. Also added chin pad to help give the tank a bit of height.

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