Author Topic: Rotary Powered Laminar  (Read 2966 times)

Offline Fish

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« on: July 23, 2003, 10:33:56 AM »
Fink\'s Ultimate Street Car Challenge entry form says it all: "Weight, horsepower, weight, styling, weight, handling, weight, engineering." Fink is the president of Advanced Engineering, Inc. in Media, Penn., where lighter is, apparently, better. AEI is responsible for the extremely light, extremely powerful car on these pages.

One look at the Laminar Concepts Viking SRX-7 and it\'s clear its creators are serious about their mission: To build a very loosely based Lotus Seven replica capable of winning every contest of automotive performance. To do so, they use a less-is-more philosophy, which makes the late Colin Chapman look like a conservative ninny by comparison.


Let\'s put the SRX-7 in perspective. Fink claims it weighs 1,710 lbs and packs 450 or so horsepower. If true, those figures put the SRX-7 worlds away from virtually any other street car and only a notch or two down from a Champ car in the power-to-weight department. Even with a 20 percent BS factor, those numbers are serious enough to make Chapman soil his knickers and give this two-seater a real shot at winning every performance test in the USCC.


The SRX-7 is constructed of 4130 tubing and covered in structural composite bodywork, so it does have some similarities to the original Lotus Super Seven. However, the likeness ends there. Power comes from a remanufactured and internally stock Mazda 13B rotary, which has all the right parts to make the claimed power figure. A single-turbo conversion using a custom-built, equal-length stainless-steel turbo header feeds the Turbonetics T04B 60-1 turbocharger. An HKS wastegate, 3-inch exhaust, high-flow catalytic converter and twin Walker Dynomax mufflers complete the exhaust system.


On the cold side of the turbo there\'s an air-to-air intercooler, which is force-fed cool air by a large hood scoop and extensive composite ducting. The stock intake manifold is Extrude Honed for better flow and the throttle body is ported. There are two stock RX-7 fuel pumps drawing fuel from the 10-gallon Fuel Safe fuel cell. Fuel is fed through -6 lines to the 550 cc/min stock injectors and an additional 1600 cc/min secondary injector. An A\'PEXi Power FC stand-alone ECU controls all engine parameters except boost, which is handled by A\'PEXi\'s AVC-R.

The rear suspension started life as a complex multi-link, semi-trailing-arm type from a second-generation RX-7, but has been heavily modified. All rubber bushings are replaced with spherical bearings. The geometry is changed, allowing for a modified roll center, as well as adjustable camber and toe. The front suspension consists of custom-built upper and lower control arms. Damping is handled by triple-adjustable Penske shocks at all four corners. And the SRX-7 rolls on the stickiest street tire known to man-the Hoosier R3S03, measuring 245/35ZR-18 in front and a staggering 275/35ZR-18 in the rear. Brakes are equally serious. Since the SRX-7 is essentially a designed-from-the-ground-up package, Fink uses a Wilwood pedal assembly with a Tilton master cylinder. Four-piston Wilwood Superlite calipers and 11.75-inch rotors make up the front brake hardware, while stock second-generation RX-7 calipers and 10.5-inch calipers are used in the rear.

On paper, the Laminar Concepts Viking SRX-7 has all the right goods to be a serious contender for the "Ultimate" title. Weaknesses? Well, history tells us that turbo rotaries are extremely sensitive to poor tuning and heat, and then there\'s the unknown issues that arise with any homebrew special like the SRX-7. Fact is, history hasn\'t been very kind to men like Jerry Fink who have the balls to build their own car. Anyone remember Jerry Weigert\'s Vector? DeLorean\'s DeLorean? Bricklin\'s Bricklin? At least Fink has physics firmly on his side. Tune in next month to see if this unique machine has what it takes.

LAMINAR CONCEPTS VIKING SRX-7
ENGINE
Engine Code: 13B
Type: Turbocharged and intercooled, two-rotor wankel
Internal Modifications: None
External Modifications: Single turbo conversion with custom stainless-steel header and Turbonetics T04B 60-1 turbocharger, HKS wastegate, 3-inch exhaust with high-flow catalytic converter and twin Dynomax mufflers, upgraded intercooler, Extrude Honed intake manifold, ported throttle body
Engine Management Modifications: A\'pexi AVC-R boost controller, A\'pexi Power FC ECU, two RX-7 fuel pumps, 1600 cc/min additional injector, Essex fuel pressure regulator
DRIVETRAIN
Layout: Front/mid engine, rear-wheel drive
Drivetrain Modifications: Centerforce clutch, aluminum flywheel
SUSPENSION
Front: Penske three-way adjustable coil-overs on custom upper and lower control arms
Rear: Penske three-way adjustable coil-overs on modified second-gen. RX-7 multi-link/trailing arm combo
BRAKES
Front: 11.75-in. cross-drilled rotors, Wilwood Superlite four-piston calipers, Hawk pads, braided stainless steel lines
Rear: 10.5-in cross-drilled rotors, single-piston sliding RX-7 calipers, Hawk pads, braided stainless steel lines external
EXTERNAL
Wheels: BBS RK 18x8.5-in. front, 18x10-in. rear
Tires: Hoosier R3S03, 245/35ZR-18 front, 275/35ZR-18 rear

Dan

Offline Fish

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« Reply #1 on: July 23, 2003, 10:34:44 AM »
Side Shot

Offline Fish

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« Reply #2 on: July 23, 2003, 10:35:07 AM »
Engine Bay

Offline Fish

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« Reply #3 on: July 23, 2003, 10:35:46 AM »
Interior

J4P RX

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« Reply #4 on: July 23, 2003, 12:19:19 PM »
Whilst I like the look of it, I converted that weight in in kilograms and its 770.  A Caterham R500 weighs 460 kgs.  I dont think this car has much of a chance against one which its clearly trying to be similar to.

Must be American to think 770 is light :D

Cheers
Lee

Offline MikeLMR

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« Reply #5 on: July 23, 2003, 12:25:06 PM »
Thats an old idea ... Sylva Autokits in the UK built a rotary powered Lotus 7 clone in the 80\'s using an RX3 engine.

I don\'t like the rear wing at all ... ughhh !

notice the dodgy bodged windscreen wiper on the passenger side too :D

Offline DRAGON

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« Reply #6 on: July 23, 2003, 12:35:04 PM »
what a cool idea, could have  put a bigger turbo on there though:)
They are not that serious about losing weight, they have left the double thottle on there.

Offline Fish

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« Reply #7 on: July 23, 2003, 01:45:16 PM »
His power to weight ratio is something like 850BHP to the tonne after he modified it a little more. They was hoping to break the sub 3 second 0-60 time. Cost was around £45k though which kills most of it.

But I understand that there are some rotary power Westfields about.

Dan

bill shurvinton

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« Reply #8 on: August 03, 2003, 09:49:15 PM »
Nearly. Just fitting the dry sump hoses and then I can start running down the pre-start check list. It\'ll be on the road in august, just in time for autumn :-(

1700lbs is rediculous in a seven.  (off the record over 300BHP gets very pointless too, as you are severly traction limited....won\'t stop me trying at some point).

Offline clive

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« Reply #9 on: August 03, 2003, 10:04:18 PM »
Come on then Bill how about some pics of yer toy,
 
All the best Clive
clive@mazdarotaryclub.com
http://www.mazdarotaryclub.com
All the best Clive

bill shurvinton

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« Reply #10 on: August 03, 2003, 10:59:05 PM »
Here\'s how it was in happier days.  I\'ll get the camera on it as soon as I have the pipes on and the lovely ITG air filter pointing out the bonnet

bill shurvinton

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« Reply #11 on: August 03, 2003, 11:06:06 PM »
Lousy scan but here it was a month ago