weld in injector bungs

[70wayfarer]

ok, i have made the move to efi. a mate has spun up some injector bungs and drilled my manifold. manifold is a victor 340 so runners are not very steep.
my question is how far does the injector tip protrude into the runner, or is it more up in the bung?

cheers

 

[67Dart273]

I frankly don't think it's all that important. The gases are "moving around" in there pretty excitedly, LOL, so I don't think there's much danger of a stagnant spot. The Holley book mentions angling them down just a bit, to prevent condensation from gathering in them, on shut down.

GAWD I'm stupid, when did I type this? For some reason I was thinking "O2 sensor"

11:30 last night LOL

 

[Bakerlite]

Don't poke them through the roof of the runner.

 

[Bakerlite]

I frankly don't think it's all that important. The gases are "moving around" in there pretty excitedly, LOL, so I don't think there's much danger of a stagnant spot. The Holley book mentions angling them down just a bit, to prevent condensation from gathering in them, on shut down.

It's important. Why you ask? Because the roof of the runner is a high flow area and you don't want to be poking anything into it and disturbing the flow downstream.

 

[70wayfarer]

thanks for that Bakerlite.

 

[famous bob]

thanks for that Bakerlite.

wonder why all intakes come w/ injector bungs in the top of the runners ? hymmm

 

[Bakerlite]

wonder why all intakes come w/ injector bungs in the top of the runners ? hymmm

Your point?

 

[mech1nxh]

70wayfarer,
late to the party...
You stated mani has been drilled, ideally the bung placement
is installed to promote the nozzle spray pattern pointing as close as possible
to the horizontal mid centerline of the intake runner.

Also on the protrusion issue,
In principal I agree, however, lots of schools of thought on this.

Also what injectors are You using? i.e., 'large body' or 'pencil' ?.

 

[70wayfarer]

70wayfarer,
late to the party...
You stated mani has been drilled, ideally the bung placement
is installed to promote the nozzle spray pattern pointing as close as possible
to the horizontal mid centerline of the intake runner.

Also on the protrusion issue,
In principal I agree, however, lots of schools of thought on this.

Also what injectors are You using? i.e., 'large body' or 'pencil' ?.

injectors are 85 lb bosch

 

[mech1nxh]

injectors are 85 lb bosch

THX, large body or small ?
Apologies, not trying to re-engineer Your build, just curious

 

[Bakerlite]

Also on the protrusion issue,
In principal I agree, however, lots of schools of thought on this.

.

And those schools of thought would be? because the way I see it, the injector nozzle either intrudes into the airflow or it doesn't .

 

[70wayfarer]

THX, large body or small ?
Apologies, not trying to re-engineer Your build, just curious

small body.

my intention was never to have the injector tip protrude into the runner. was looking at keeping it about 1/8" up in the bung. just thought i'd ask in case i was missing something. once welded in that is it.

 

[pishta]

they all go in on the outside because its the easiest place to introduce them. Think of cost, probably the only reason there. Imagine putting them on the other side....? Some have a wide spray pattern so you cant bury them, while others have a narrow pattern.

 

[krazykuda]

I need tee-pee for my bung hole....

[ame]https://youtu.be/qqaKi9NTzS4[/ame]

 

[jbc426]

injectors are 85 lb bosch

Wow, those are huge! My 480hp, 408" Eddie headed stroker 5.9 Magnum only needed 39lbs injectors. Are you using a blower or something on it? Those are big enough for a supercharged big block.

 

[goldduster318]

Wow, those are huge! My 480hp, 408" Eddie headed stroker 5.9 Magnum only needed 39lbs injectors. Are you using a blower or something on it? Those are big enough for a supercharged big block.

No kidding, my 340 @ 470hp is doing just fine with 36 lb/hr injectors.



That's the super victor EFI intake. The injector tips sit above the roof of the runner. I'd guess it's somewhere between 1/8 and 1/4". I think that's the direction I would have gone relative to doing all this work, but maybe it's prohibitive to do that down under. The intake and rails are unmodified edelbrock parts.

 

[70wayfarer]

Wow, those are huge! My 480hp, 408" Eddie headed stroker 5.9 Magnum only needed 39lbs injectors. Are you using a blower or something on it? Those are big enough for a supercharged big block.

it is a 360/410 stroker with a S475 turbo, hence the big injectors.
i have made the move to efi as the pro systems bt carb was an absolute pig of a thing.

 

[70wayfarer]

No kidding, my 340 @ 470hp is doing just fine with 36 lb/hr injectors.



That's the super victor EFI intake. The injector tips sit above the roof of the runner. I'd guess it's somewhere between 1/8 and 1/4". I think that's the direction I would have gone relative to doing all this work, but maybe it's prohibitive to do that down under. The intake and rails are unmodified edelbrock parts.

nice look'n engine. i did look at the super victor, but the cost of importing one to New Zealand was astronomical. i already had the victor 340 so got some bungs made and had manifold drilled.

what coils are those. will be looking at buying coils soon.

 

[goldduster318]

nice look'n engine. i did look at the super victor, but the cost of importing one to New Zealand was astronomical. i already had the victor 340 so got some bungs made and had manifold drilled.

what coils are those. will be looking at buying coils soon.

They are the "D585" LSX coils. They are sometimes known as truck coils or round coils. A lot of the newer EFI computers (MS3X/MS3Pro and others) can run these directly. They work great. I don't think you can really go wrong with any of the LSX coils honestly.