Motorcyle Chin Tanks

[wolbrink471]

I meekly have to admit that I have no idea what a motorcycle drag racing chin tank looks like.

One part of me is hoping that i recognize it and just never knew the proper term, but mainly I just want to make sure I understand what one is.

Thanks

Mark

[Seldom Seen Slim]

So I was thinking about maybe responding about the chin tank question posed elsewhere (I think), but I can't remember which thread it was.  Someone wanna refresh my memory so I can have a chance to put my foot (size 14) in my mouth (size medium)?

I wouldn't object to seeing a photo or seven of chin tanks, either -- might make my (potential) comments more cogent to us all.

[JackD]

In the days before wheelie bars and with the more common use of mechanical injection the "chin tanks" were located on the front of the down tubes and aft of the front wheel.
As they developed the shape evolved into what they thought was an aerodynamic aid to not only handle that wind flow but allow the rider to get further down over the backbone of the bike.
S+S carbs and others were still gravity feed and it became popular to put a small tube tank on each side of the back bone to get the required capacity an keep the rider low..
Putting the weight that far forward was an attempt to keep the front end down.
You can see in LSR how that would be defined streamlining ahead of the rider and it is treated as such.
A smart cookie might put a fat down tube on the special built frame and fill it with fuel for the same effect.
 The same shape as a bolt on would be treated as streamlining in LSR I bet.

[bbb]

some builders will put the oil bag in the same position when building a rigid.

[panchop]

[panchop]

.....

[JackD]

PANCHOP WINS!
I knew he could do it.