AMT Copperhead

[bluestringer]

Started on this little dragster I picked up at Ollie's. 

[Zippi]

That looks pretty kewl there James.  Never built a Dragster before.  

[bluestringer]

1 hour ago, Zippi said:

That looks pretty kewl there James.  Never built a Dragster before.  

My first one also Bob. Seems like a simple kit. The frame is all one piece, so no fiddling with it. Nice looking engine with it, I'll add some plug wires, but it will mostly be OOB build. Thought about some fuel lines but not sure how these things are plumbed. 

[dwc43]

1 hour ago, bluestringer said:

My first one also Bob. Seems like a simple kit. The frame is all one piece, so no fiddling with it. Nice looking engine with it, I'll add some plug wires, but it will mostly be OOB build. Thought about some fuel lines but not sure how these things are plumbed. 

Depends on the years, but they have a huge fuel line and a smaller return line. Fuel pump mounts off the camshaft and sticks out past the blower belt. From the pump to the barrel valve to the injectors. 

 

 

 

[bluestringer]

2 hours ago, dwc43 said:

Depends on the years, but they have a huge fuel line and a smaller return line. Fuel pump mounts off the camshaft and sticks out past the blower belt. From the pump to the barrel valve to the injectors. 

 

 

 

Thanks. I've got what looks like three connections on the fuel pump, one at the bottom, two at the top. I'm assuming the bottom one is the return, and the one of the top ones is the inlet, the other the outlet? Where would I connect the line at the injectors? Looks like there is a small distribution block on the front of the injectors. I may give it a try if I can find the right wire to do it with. It would not be perfect, but it may give it a better look. 

[dwc43]

Bottom return, side from the tank, and top is the outlet to the barrel valve and from the valve to the injectors. The barrel valve is controlled by the throttle pedal. on the pics with the injector hat the barrel valve is on the side of the hat. The throttle opens the butterflies and controls the valve at the same time. Your engine looks like it has 8 short stacks. One line to the bottom of each stack and the throttle opens 8 butterflies inside the bottom of the stacks. Hard to see your pic, but it looks like it has a base under the stacks. Your injector lines could go in there. Trying to keep it simple, but hope that helps.

 

 

 

Edited November 20, 2023 by dwc43

[bluestringer]

Thanks for the photos, they help. The next to the last one looks like what I've got except mine is 2 stacks and that one's 4. I have the little box at the front like that. I can just run a line from the fuel pump to it, then 2 lines off that to the stacks. 

[dwc43]

Welcome anytime. Glad to help. 

[dragcarz]

You’re off to a great start, I’ll be watching!

[afx]

Always enjoy an old school dragster build - nice start.

[Straightliner59]

This should help. It's the most comprehensive explanation of nitro fuel systems I've ever seen. You'll want the single pump setup. 

Edited November 22, 2023 by Straightliner59

[bluestringer]

Engine almost done, headers will go on last. I know the plumbing is probably not accurate, but It's all I can do. I'm satisfied with it. There are lines going to the injectors, hard to see because they are black, should have used blue like the feed line. 

Edited November 25, 2023 by bluestringer

[dwc43]

Looks good, including the lines.

[Andrew McD]

Good looking engine!  I'll be keeping an eye on this one.

[bluestringer]

On 11/21/2023 at 9:53 AM, dragcarz said:

You’re off to a great start, I’ll be watching!

Thanks.

 

On 11/25/2023 at 7:55 PM, dwc43 said:

Looks good, including the lines.

Thanks.

 

On 11/26/2023 at 10:37 PM, Andrew McD said:

Good looking engine!  I'll be keeping an eye on this one.

Thanks.

[bluestringer]

Ok, copperhead got to be copper, right. Tamiya XF 28 dark copper.  

[bluestringer]

Calling this one done. I'll put it under glass.