427 with Kenne Bell Blowzilla/Flowzilla

[Muststang]

What kind of numbers could you expect on a 427 windsor with the Kenne Bell Blowzilla/Flowzilla supercharger kit? It has a maximum boost of 18psi and all you need is a GT-40 lower intake and maybe a slightly longer belt due to the taller deck height. This is if the proper porting were done on the intake and heads. On the website it states that these kits are good for 785 horsepower but it doesn't state what type of 302 that is made on.

Is anyone else disappointed that they're ignoring the push rod guys and making the really large and intercooled models for the modular guys only?

 

[MysteryMachine]

Umm do they make a gt-40 for the 351?

 

[Muststang]

They did for the 1993-1994 Ford Lightning. There's one on Ebay right now.

 

[revhead347]

It'll make a lot of power. Hard to say how much. If you're going to sink that much money into a motor though, I would spend the little bit extra to get a Paxton or a Vortech though. It's not a whole lot more money. 18psi is **** ton on a Kenne Bell. Strongly recommend meth injection or race gas for that.

Kurt

 

[MysteryMachine]

They did for the 1993-1994 Ford Lightning. There's one on Ebay right now.

Ah ok yeah forgot about the lightning

 

[Muststang]

It'll make a lot of power. Hard to say how much. If you're going to sink that much money into a motor though, I would spend the little bit extra to get a Paxton or a Vortech though. It's not a whole lot more money. 18psi is **** ton on a Kenne Bell. Strongly recommend meth injection or race gas for that.

Kurt

To me the most attractive thing about the twin screws is that they are so small and look real clean under the hood. No huge tubes and no front mounted intercooler. Unfortunately Kenne Bell thinks that us push rod guys are happy with the teeny tiny units they make and focus on the modulars with bigger and bigger systems. It's sad because no modular can be stroked to 400+ like a push rod ford can. It'd also be awesome if they'd at least have a air/water intercooler built into the tiny kits they make for the push rod fords.

 

[revhead347]

There are some advantages and disadvantages to both types of blowers. I'm not sure how big of a Kenne Bell they make for an old SBF, but I was under the impression there's a pretty big one out there. I'm sure with the right heads and the Kenne Bell, you're going to make more power than you are looking for. I would just keep it around 8psi. Remember, bigger heads are going to drop the boost anyway, while still making more power. If you want to make big power, you're going to need an intercooler, and consequently, a centrifugal. But I'm not sure that's what you're looking for.

Kurt

 

[BlackVert]

seems to me a twin screw on a 427 is overkill. that thing already is gonna have killer bottom end torque that you would have a really hard time keeping the tires from spinning. a 427 already has amazing torque. something like twin turbos would make a 427 amazing. i wish i had dropped the compression on mine when it was being built so i could boost it if the desire came over me.

 

[revhead347]

You think that a twin screw is overkill on the torque, and then you recommend twin turbos. I like the way you think, but it's kind of of counter intuitive.

Kurt

 

[BlackVert]

it it the whole "instant boost at low rpms" that i am referring to about the overkill. the turbos would presumably not spool up immediately as does a KB. that's what i meant at least

 

[Gearbanger 101]

You'd never see 18psi feeding 427ci with the 2.1L that's included with the Kenne Bell kit anyway.

Nor would I imagine one would see he advertised 785hp Kenne Bell "claims" they will make either. At least not without a custom manifold, a boat load of water/meth and a steady diet or race fuel feeding the beast like was suggested. And that figure would be on an engine dyno with no accesories. There's no chance in hell one would make that at the wheel...or even SAE numbers for that matter.

The resriction in the combo is eventually going to be the manifold and smallish 2.1L compressor itself. That's just not a lot of volume. Especially when you consider they're running 2.8-3.4L compressors on the new GT 500's....and those lkits are feeding 5.4L of displacement....not 7.0L.

I do however think 600-650fwhp could be attained pretty easily...and with a very mild, steet friendly combination at that.

There's no such thing as too much low end torque IMO.

 

[revhead347]

it it the whole "instant boost at low rpms" that i am referring to about the overkill. the turbos would presumably not spool up immediately as does a KB. that's what i meant at least

I've driven a few twin turbo Mustangs. Believe me, that boost is far more instant than waiting for a Kenne Bell to get up to RPM. A good turbocharger setup spools a lot quicker than most people think. A blower is designed to put out a specific amount of boost at a specific rpm. Turbos go full boost as soon as the there is heat in the exhaust.

Kurt

 

[Muststang]

You'd never see 18psi feeding 427ci with the 2.1L that's included with the Kenne Bell kit anyway.

Nor would I imagine one would see he advertised 785hp Kenne Bell "claims" they will make either. At least not without a custom manifold, a boat load of water/meth and a steady diet or race fuel feeding the beast like was suggested. And that figure would be on an engine dyno with no accesories. There's no chance in hell one would make that at the wheel...or even SAE numbers for that matter.

The resriction in the combo is eventually going to be the manifold and smallish 2.1L compressor itself. That's just not a lot of volume. Especially when you consider they're running 2.8-3.4L compressors on the new GT 500's....and those lkits are feeding 5.4L of displacement....not 7.0L.

I do however think 600-650fwhp could be attained pretty easily...and with a very mild, steet friendly combination at that.

There's no such thing as too much low end torque IMO.

Would be great if they would make a version of the 3.4 and 4.2 kit for the pushrods engines with the air to water intercoolers included. That would be nasty.

 

[Black Stampede]

Yeah I'd be leaning towards the turbo idea before putting a KB on a motor that sweet.

 

[Gearbanger 101]

I've driven a few twin turbo Mustangs. Believe me, that boost is far more instant than waiting for a Kenne Bell to get up to RPM. A good turbocharger setup spools a lot quicker than most people think. A blower is designed to put out a specific amount of boost at a specific rpm. Turbos go full boost as soon as the there is heat in the exhaust.

Kurt

With all due respect Kurt....while I agree a properly sized turbo application can be made to come on much quicker than any of the run of the mill set ups many of us are used to seeing, no turbo(s) of any size or configuration could come anywhere close to "spooling up" as quickly as a PD blower. Unlike Centrifugals, Positive Displacement blowers are "not" RPM dependant. In the Kenne Bells case, each revolution provides 2.1L of air. Pullied right, you could be seeing 8-10psi before the turbo even begins to spool. Boost and power production is near instant.

My Eaton for example begins to see boost almost right off idle when I drill the loud pedal....and I'm seeing 10psi before the tach hits 1,800RPM. The instant gratification is part of the charm of these kits. Their drawback with the Kenne Bell is high ACT's and the limited blower speeds able to be run without some form of aftercooler or a steady diet of race gas to compensate. But then similar drawbacks also make themselves apparent when you put together a turbo system with quick spooling capability….and that drawback is that you quickly realize a turbo or turbo’s sized small enough to come on quickly enough to emulate similar low RPM production characteristics of a Positive Displacement blower not only still fall short, but are now also limited to the amount of power they’re able to produce on the big end as well.

I’m still waiting for the mythical "one size fits all" power adder to hit the market, but alas I’m afraid we’re all going to have to live with various tradeoffs and compromises with the current crop of systems until that comes out.

 

[revhead347]

There is a one size fits all power adder, just use all of them.

Anyway, I've ridden in Lightnings and Cougars, blown Cobras and such. I find that the Eaton usually gets some low end grunt in there, but it really doesn't start to pull until it hits the upper RPM. The twin screws are suposed to be more rpm dependent, but I can't tell the difference. Still nothing like a turbo or nitrous which is just retarded low end torque.

Kurt

 

[Gearbanger 101]

There is a one size fits all power adder, just use all of them.

Anyway, I've ridden in Lightnings and Cougars, blown Cobras and such. I find that the Eaton usually gets some low end grunt in there, but it really doesn't start to pull until it hits the upper RPM. The twin screws are suposed to be more rpm dependent, but I can't tell the difference. Still nothing like a turbo or nitrous which is just retarded low end torque.

Kurt

It's all in the way their pullied and modified IMO. Its hard to compare a custom, turbo'd, tuned and modified Fox body set up to your run of the mill out of the box Lightning, Cougar, Cobra. Not to mention the lightest vehicle in that line up you just mentioned was over 3,660lbs.

With the same treatment, pullied and modified V8's with PD blowers really come on hard and fast. Mine for example is running just a little Eaton M90S (about 1.35L), but with my bolt ons and pulley configuration, it's seeing over 430lbs/ft at low as 2,000RPM and over 465lbs/ft at peak. Not a huge torque figure, but making that much at such low RPM is pretty astounding IMO.

I think the fact that turbo's make "retarded" torque period is what's clouding the issue here....not that they make more of it in the lower regions. Nitrous is a whole other ball of wax than any form of forced induction though. It just makes power everywhere...at least till the bottle runs dry.

I agree though....using multiple power adders is the way to go for ultimate power and drivability. Compound boost, or using a little nitrous as a secondary power adder is certainly an excellent way to close up the gaps in an otherwise one sided power band.

 

[revhead347]

Yeah, I think we're arguing over nickels and dimes here. But the truth is, no matter what rpm it's at, the turbo setup is going to make so much more torque overall than the K/B, it's not going to matter.

Kurt