Engine Design Options...Two ways to build a 509?...aw heck, lets make it a 632BBC !!!

[Greg72]

Have you found ANY BBC fuel injection that can keep up with 632 cubic inches!? would be nice to have it still purring and running perfect on a sidehill.
I have this feeling its gonna need more than 1000 cfm! and i don't think BBC ramjet or edelbrock proflo was really designed for something that huge.
Maybe custom built injection is what you're gonna be after with a custom built monster motor.

RB,

Nope, no idears yet on that one. In fact, fuel delivery in general is going to be a challenge. Every one of these large crate engines seems to be built with a 1050 Dominator or some other "drag race" type carb. Not exactly "4x4 friendly" if I had to guess.

My initial hope (and this is all unsubstantiated) is that by avoiding a high-HP monster, I won't need the super large CFMs from the fuel system. The DD simulations I've done were only using carbs in the 750CFM - 900CFM range....they do lose power (and torque) over the larger units, but not in a catastrophic way.

To make it even harder on myself, I don't want the "look" of a multi-port EFI system on this engine either. A "classic" truck needs a classic pushrod V8 with a "carb"-looking system on it. I figure a LARGE TBI system could probably be disguised well enough with the air cleaner to pull that one off......but a couple of shiny fuel rails running down each side of the engine, with modern plastic covered injectors and wiring loom isn't going to be acceptable to me.

If there was a way to somehow "hide" the injectors on the underside of the manifold instead of on the outside (and run all the wiring underneath and hidden too!) I could probably be convinced to do that.....I've never seen it done, and I'm not sure I could afford to have someone develop that solution for me.....


So many things to figure out.....good thing I've still got a couple of years left.

 

[Stephen]

OK, you may need to get a hold of Zack Steele now, he's running a hybrid mustang multiport efi system that he's really happy with and I think you'd have just about unlimited options for displacement since it's a mass airflow system. It will have fuel rails and wires and stuff but it sounds like it keeps all the power, requires min. tuning, and is very adaptable.
Airflow is easy to figure out, it's pretty mathmatical once you have your engine configuration and rpm requirements. You should be able to get away with a smaller throttle body with low rpm's but I'm guessing that this thing should be able to run to 5500 or 6K RPM before it redlines so you'll need some airflow.
505 Performance's phone is 505 325 3533.

though about a blower?

 

[john39671]

We just built a Blown 540. It is going into a 66 Shoebox Nova.

 

[Greg72]

We just built a Blown 540. It is going into a 66 Shoebox Nova.

That's PURDY!

Any other specs? Dyno results?


Teaser pics are clearly not enough.....

 

[ryoken]

hmmm, funny this came up about big h.p FI systems...

my buddy from Kurt's Marine was in today running some big number FI setups on the mountain motors in the 46' Skater they were testing today...

i was busy so i didn't get to peek, the yard kid said it was a pretty rad setup..

i'll have to grab Kurt when he's in over the next couple days and pick his brain on what they're running... almost everything they put together is usually in 600 to 700 cid range... generally 700 to 1300 h.p range...

FI 502's are a common production boat motor these days, well 496's now.. but this is the first i've heard of one of the 100+ mph Cat boats running FI...

will update...

 

[willyswanter]

So, uh, Greg, what are you going to do to those 404's to make them handle this?

 

[Greg72]

So, uh, Greg, what are you going to do to those 404's to make them handle this?

....I'm swapping them for some Dana35s.


....I mean, I'm building them out of 300M.



In all seriousness, the best I can do (for now) is to reduce the vehicle weight as much as possible, and limit my tire size to 38.5" to help with the rotating mass.

If I start fragging a bunch of parts, then maybe I will have to go the Camo route and start replacing each part that grenades with a 300M equivalent?

What's your guess on the "weak link" in the Mogs? Is it the portal gears? The axle shafts themselves seem pretty beefy to me, and I'm pretty sure Exaxt already sells larger versions of those anyway...

 

[steve_kibbe]

We just built a Blown 540. It is going into a 66 Shoebox Nova.

Those are sweet heads, I bet they are the cnc's

 

[john39671]

Havent dynoed it yet, mabey next month. We are guestimating around 1100 hp.
We started with a bare Bowtie splayed main cap 454, cut the bores 1/4 in each, Crane .635 Hyd roller cam. AFR heads, JE pistons and BDS intake and blower. I cant wait until the customer gets it put in the car and tears up the streets of Hermiston, OR.

 

[willyswanter]

What's your guess on the "weak link" in the Mogs? Is it the portal gears? The axle shafts themselves seem pretty beefy to me, and I'm pretty sure Exaxt already sells larger versions of those anyway...

The first weak link would be the portal boxes. The 404's are made from a pot metal that is very weak. Combine that with the helical cut gears and when you are bound up you will be putting a ton of side load on the cases and thats when they frag. Couple comp guys have made some reinforcement plates that line the portal housing to help but they still bust them with 4 cylinder ecotecs and 40" krawlers.

The next spot would be the locker assembly. They are known to blow the teeth off when bound up. No real fix for this, just keep spares.

Personally, I think you should be looking for some 416 axles or U1000 or U1300 series diffs. The portal boxes are MUCH thicker and made of a much better material. They also have alot of ribbing to add strength. They have straight cut gears so no side loading and the shafts or forkin huge!