i was wondering if there was a predetermined size for the bungs to be fitted into the intake, or do you need the injector that is to be used to find the size. I'm looking at getting some injectors, but from the pictures some of them look like the bottom half are different in size.

 

I made my own. 1x1 Then put em in the lathe and bored em to size and put a clean face on em.

http://www.cecoatings.com/images/Car...n/DSC02170.JPG


http://www.cecoatings.com/images/Car...n/DSC02188.JPG

 

thanks for the pic... after searching on megasquirts site i finally found what i was looking for.

The manifold injector bungs are 0.530"-0.535" inside diameter [about 17/32" or 13.5 mm]. The fuel supply rail bungs for the top of the injectors are the same size.

i always get a headache from surfing this site after about 2 hours.

 

uuuuhhhhh. Glad ya found a pic. That will help others later also.

 

i have also been wondering how you determined how high the bung sits for the injector. How much of the injector tip needs to be exposed in the intake?

Nice work btw

 

lots of reading.

http://web.camaross.com/forums/showt...=intake+design
https://www.thirdgen.org/techbb2/sho...hreadid=210366
https://www.thirdgen.org/techbb2/sho...=plenum+volume
http://aldengard.lixom.nu/gallery/intake-conversion


This is the pictire I used to get a idea of how to set the injector in place



http://aldengard.lixom.nu/gallery/intake-conversion

Measure 100x cut and weld once.

 

thkx alot.. i really appreciate.

 

No problem.

What intake are you converting? what motor you building etc.?

and deff post some pic;s

 

I have heard that the tubing nut sleeves used for putting an AN fitting with a flare onto metal lines will work.

I cant remember the size, -12? -14? -16? they come anodized but easyoff oven cleaner removes anodizing with almost no scrubbing.

Weld on low heat welder setting since it doesnt support much more than epoxy would hold anyways.

just something to think about...

 

im still working on my build list for my car( and waiting for the wife to let me buy some goodies). It is just a matter of being on a minimized budget. I wanted to know about the injector bungs because i was looking at running megasquirt if EFI was justifyable in money sense compared to a carb setup. Right now im working on her z28, so i cant get to my car just yet. I will definitely post pics when i start my project.

btw here are the specs im leaning towards: 383 stroker (87-95 block),megasquirtII, either jr., or super victor intake, and vortec heads unless she will let me buy some nice ones . I still havent decided on a cam just yet, mainly just because im looking for one that will give okay street manners, but allow plenty of power. im shooting for around 450hp, when im done, and still leaving the option open for maybe a blower or turbo way down the road

ps.. thanks to all forum members for all the help they were willing to pass on

 

sounds like it will be a nice project. If you need help let me know. I can make more bungs,have the setup welded for you etc if you are looking for anything.

 

A few things I would like to mention after reading that last post is that Edelbrock sells the victor intake with bungs already on it and even has fuel rails premade for it.

manifold

manifold with rails

or just do the rails to make your project easier:

rails

Also Holley has a bunch of different singleplane manifolds which used to be sold under the Weiand name that came with injector bungs already on them and machined for efi injectors. some of them were also much lower profile.

There is also the chinese cast professional products company manifolds which have two singleplane models for regular and vortech heads which run very cheap.

There has been some concern over possible welding problems with these manifolds, but I have heard the same complaints about Edelbrock and Holley manifolds lately as they have adopted similar materials to be competitive and to increase their magins of profit.

Welding the bungs is not the only option, a tight fit for the bung when you drill and epoxy'ing the bungs into place also was and still is a viable option considering the low stress on this part of the manifold. Careful selection of the type of epoxy used would definitely be needed.

But a good welding dude can help in any situation of course

 

Bungs from Ross machining are really good and cheap. They can be found on e-bay or their website.

People have problems welding a small aluminum bung to an aluminum manifold because aluminum can disapate soo much heat quickly. Most of the time, the bungs are welded in, then drilled to take care of any distortion in the bung that has occurred. You should also have the sealing surface of the intake re-machined after welding the manifold.

After saying all of that, there is nothing wrong with epoxy. Buy the good stuff and use a good amount. If you do it right, you would have a hard time beating it out.

If you make your own bungs, be sure to use the clips on the injectors. Or make a small stop in the bung.

Do not worry about angle of the injector. The tpi's minirams' and HSR's are pointed at a very small angle if at all. Just make sure the whole tip of the injector sticks in the port.

 

thanks for all the help guys.. ill post later with my decision... still need to read up some more.

 

I only mentioned epoxy because alot of the first custom EFI intakes used it in the early 90's. I also grew up in the town where a company Called Dexter-Hysol existed. They made glue for holding jet engines onto airplanes. Thier unofficial motto was that you could glue anything to anything if you used the right stuff.

 

Good ****... but I prefer to just weld em in.

 

it is the preferred way. ome people don't have the welder, can't weld, or can't afford to pay to have it done. For those people the -AN tube nut sleeve, professional products intake, edelbrock rails, and epoxy will yield the most for cheapest outlay.

At the other end of the spectrum is the Hogans sheetmetal EFI, with the premade Edelbrock EFI intake, or your custom bung, self welded intake being somewhere in between the two.

 

heheh next is a complete custom sheet metal intake like a hogans or willsion. Just to be diff and say I made it myself.

If I didnt have the resorces to do any of this I would prob just buy the pro ram, edel one or something.

 

I like this hybrid, of sheetmetal and cast. I wouldnt mind seeing a hybrid based on just the lower of a HSR or some other tunnel ram even.

Obviously they did it for space constraints but I still like it.



http://www.hotrodsolutions.net/EFI4.html

take a look around the site, its interesting.