Technical Help request, injected 426 Hemi dragster, model

That's some mighty tasty lookin' eye-candy you got there. Welcome aboard! Be sure to keep us updated . . .We love pictures around here.

 

Enlarge my dragster

 

ClayMart, I don't think this is the place to be posting model photos. But pertaining to the topic, I'd appreciate some closeups of 426 mechanical injected front manifold views.

Here's one of the last early Hemi injected model, on a Bantam altered...It's close, I wished to have smoothed out the block more though.

 

Very impressive Mike. Thanks for sharing the pics.

 

Well I tell you what, I went here, recommended from a fellow on the site where I'm showing the FED project;
https://www.jalopyjournal.com/forum/threads/the-induction-thread.1042950/
Mikey, those are impressive pics! wow.

 

Mike...........great workmanship.....are they 1/25th scale?.........amazing..........I used to be a member of the Straightline Modellers Forum, 15-20 yrs ago and they had some amazing modellers there but I haven't had any contact for a long time, do you know if that forums still operating?......if so they maybe able to help you also, but I for one would love to see more pics..........regards from Oz.....Andy Douglas

 

You bet your sweet biscuits.
Wow... perfect.

Sent from my VS835 using The H.A.M.B. mobile app

 

So... even pictures of 426 Hemi engines are becoming rare.
Dang... LOL

Sent from my VS835 using The H.A.M.B. mobile app

 

Hello Andy, yes, 1:25 scale. I know the straightline forum you talk about. Pretty much dead nowadays, less than one reply or comment daily, so the feedback is about zero. They banned me too, seems a fellow didn't like criticism. Well, wasn't the first time. I'm still alive....maybe a bit more mellow nowadays.

For modeling cars, I can only suggest a series of FB groups, much livelier and even more friendly, also lots of the guys from where you mentioned are there. Shoot me a PM, I can give you a few links of great places. For the model car hobby, about the only way to go in today's world. I was never on FB before, and only use it for my cars, and of course others as well. Lots of fellow modelers from your neck of the woods too.

Greetings to Down Under, Mike..

 

Mike.............I too am not a facebook person........I used to own my own hobby shop, Scale Automobilia from 1996 to 2016, spe******ed in plastic car,truck & aircraft kits & resin conversions .......no toys, trains, radio control or dolls.....lol..........been building models myself since the early 60's, plus 1;1 scale 1940 Dodges since 1969.........will grow out of it soon my wife hopes..........your models are exquisite and wouldn't look out of place in a museum...........andyd

 

Back to topic, maybe this is figured out now.

The motor will have a cam driven fuel pump, with two fuel lines running directly up to the fuel block on the front of the manifold. This fuel block will have 4 connections each side for the left and right side cylinders. The manifold fuel block will have 2 fittings at the front, for the fuel supply and the fuel return.

This is the best I can come up with, maybe too simple, but simple is good when you don't know your A from a hole in the ground...here a photo of what will be the front of the manifold...by the way, the 8 lower injector stacks are already mounted and I like 'em. Throttle linkage too is there....

This motor will have very short stacks, shorter than these shown....



I appreciate your interest, many thanks.
Mike..

 

UPDATE on this topic. Here's the deal about the barrel valve position on the manifold, for a 426 Hemi. This info from Bruce Dyda, so I'll take it as is without a question.

The barrel valve, previously wrongly stated by me as a fuel block, on the 426 was an optional choice. Either in the back or in the front, depending on the setup. Earlier with the then new 426, guys tried placing the BV in the manifold middle, but the occurring linkage and fine tuning possibilities being limited, the barrel valve was either moved to the back or the front, your choice. This way, tuning the fuel flow was much easier. I do believe the Hilborn setup as shown, shows that an adaptation was implemented to place the fuel block at the end of the manifold, but if front or back is just a choice of the builder.

I'm going with a rearmost placement, as the barrel valve is directly connected to the ****pit shutoff, and from a modelers view, makes it easier as the front has a cam driven fuel pump and a magneto with a ton of wires to get around other things.

At the very least, here's snapshot of where the mechanical fuel injection is heading with this model...more to come.

Mike..

 

****e thats nice...........and how do you put such a tight bend in what I ***ume is br*** tubing on the zoomie pipes?.........is the block br*** also?.........andyd

 

Hi Andy, fact is, for this tight radius in 1:25 scale, a smooth bend is not possible. A 45° bend is about maximum, as the tubes on the inside crumple up, the outside bend though, lets the material just split apart, regardless of how you might stuff the tube to prevent a collapse.

I've tried numerous methods, heat treating and such, to no avail. I'm a Master technician in the metal industry, or was...retired now! Great!

Copper is not much different with the tight radius bending. The problem being the wall thickness of the offered tubes in this small scale. In the larger scale of 1:16, things get easier.

So, we have to do what real car guys do, pie cuts! Then solder up the slits! Great. Make about 5 slices, bend them at ease on the car in situ...tack them up when aligned, do the rest as an individual pipe.

Concerning the block and heads for this matter, this one is styrene. I prefer doing these parts in metal , as well as the rest of the motor. They're usually cast in nickel alloy or a chrome/cobalt alloy...steel like.

Since C-virus, my source for this duty is closed. I'm retired, so I cannot do it myself anymore. Also a photo of an all metal motor finished up last summer...

Look here...

 

Super cool models! Thanks for the pictures

 

What if you made the header bends from solid br*** rod, cherry red and then braze the same diameter tubing on the end? Might save finishing time. Beautiful models!

 

For the tubes you could lay them out on flat br*** as half a tube split down the length, then form them ( press into a die?) into a semi circle down the length , left and right halves , and then solder them together.

For the block you could take the styrene and coat it in grog ( a potters or lost wax die casters material, then pour them yourself from pewter or other low melting point metal , finally cracking of the ceramic "grog" to reveal a perfect copy of the styrene foam block you started with...might take a few practice sessions first. There is a HAMB member who makes gearshift knobs using this method.

https://www.jalopyjournal.com/forum/threads/skull-shifter-update-and-lost-wax-casting-info.112873/

 

Incredible craftsmanship in your models. Keep posting pictures, they will be appreciated by many here.

 

I sure don’t think anyone will complain about this thread. I’m digging it for sure. Of course I’m just a small fish swimming with the current.
This was definitely the place to come for answers to your questions.
I noticed that someone suggested the Art thread. There is also a Sunday Model thread in the Antiquated section if you want to post a few pics there. (In addition to this thread for your questions) That’s up to you but I’m betting your fine here.

 

How will that work when he fires those bad boys up?

 

Solid rod! Now that's an idea! Geez, so simple. I'm trying this out too. Don't have any rod that size, but similar, should be able to tell right away what the deal is. Bad thing though, if it does work out and is easy enough, the shop where I order my stuff is closed till mid-April....virus.

Anyways, the ones I have mounted are finished, so I'll stick with them...Thanks for the input!

 

@97, thanks for this. Usually, I'll just cast all styrene parts in metal, using the "lost way technique". Just my source is closed down due to C-virus, so I'm using what I have. No shops, online or in the city are open in Germany.

Thanks slayer, I never realized that models would interest so many fellows here.

wraymen, thanks for the praise. I learned about the Sunday Model forum when I introduced myself here. after opening this topic here, I went over there and started posting the build progress of the FED on the bench now. Doing the photos here was not my intention from the beginning, but there will be questions coming up, plus, I kind of like taking a look around here....and drooling.

 

Nice work Mike. I like the solid stock for headers idea..Perhaps make the bends and drill the open ends?

 

UPDATE: Fuel injection fab work

Going back to the photo of the Hilborn manifold, no way I can make a BV like that one in 1:25 scale. Bruce Dyda sent me this photo, with the BV in the manifold middle. This is the way forward now, as I only have to deal with 4 ports grouped together, and not 8 together.


Here my 1st attempt at a BV in the middle, 4 ports front and 4 ports to the rear, also with an incoming fuel line and the return line back to the fuel pump;



No good! It's just too big. Right now a simpler method is in the works. Just bundle the bare tubes together in a 4-block, and make some kind of housing afterwards. this will be almost half the size....more later.

Mike..

 

Mike really appreciate how you share your processes and ideas with us. Great thread and if I get a vote please continue to share the pictures. Masterpieces.

 

+1

 

Very cool stuff...here's a little sampler of what I could probably find for you.
I have a fairly large collection of magazines and there's quit a few drag racing ones plus old catalogs.
If any of this kind of stuff will help you let me know and I will see what I can find ...
Sorry for the ****py shots , just getting going this morning,
Once I get my breakfast and meds chocked down the shots hopefully get a bit clearer.
Thanks
Terry (aka Rudestude)

Sent from my SM-T387V using The H.A.M.B. mobile app

 

@rudestude, Wow Terry! The cars you just showed here are exactly what I'm trying to replicate. I've searched thousands of photos online, countless websites for vintage 60's dragsters that are not blown....I know those. Just the smaller cars is what I'd like to do here. Perfect! I beleive they were Jr. Fuelers, but again, info is rare. Many thanks, Also the photo Bruce Dyda sent me looks to be the same as the SBC manifold with manifold middle BV you've shown.

I'd love to see some setups close up of the Hemi motors, 392 or 426, the manifold setup is probably the same. Excellent!

Mike..

 

Here's another group.
Most of my stuff runs from 50's to 69 maybe a few 70 to 71's.
Is it just injected Hemi stuff you want , engines only?
I run across alot of altered stuff also.
I have some books , well I did , on just injected Hemi stuff...I had a rail years ago , it came with two 392's both Hilborn injected one was setup for gas the other alcohol. The book may of gone with the car.
See what I find.

Sent from my SM-T387V using The H.A.M.B. mobile app

 

Rudestude, great pics. You must have some collection!