Well my 84hp A15 chews enough gearboxes now. . . With 200 hp I'd be broke(r)!

Why don't you use an A15 gearbox?

My motor was built to put out 160hp ATE or so I am told, dont know about the original build cost though. It's very drivable on the street (when its warmed up!)
I see no reason why 180-200hp could not be achieved with lots of cash.
One day I'll get the car back to the dyno and hopefully get a Hp figure ATW.

ATE? Do you mean at the flywheel? That's how car manufacturer's measure horsepower.

Yeah at the flywheel.

Specs
Driver: Rick Bone
Car: 1972 Datsun 1200 Coupe purpose built circuit car
Body Mods: Fully seam welded, Extensive MANZ approved rollcage, fully adjustable carbon fibre rear wing, front splitter, lexan windows
Engine: Datsun A15 (1500cc) non-crossflow pushrod, Cosworth steel crank, Carrilo rods, JE forged pistons, Titanium intake valves, competition triple valve springs, Yella Terra roller rockers, adjustable cam wheel, Nismo competition head gasket, 48mm SK Racing quad throttle bodies, tuned length 4 to 1 extractors, Bosch 044 fuel pump, custom alloy flywheel, Tilton twin plate clutch, 2 stage drysump oil pump, 10ltr Peterson dry-sump oil tank, Microtech computer, Max RPM 8800rpm
Power: 207BHP
Driveline: 5-speed gearbox with Nismo competition close ratio gear set, Datsun 1200 Ute diff with Nismo variable ratio LSD
Suspension: Bilstein front shocks, Spax coil-over adjustable rear shocks, adjustable front & rear swaybars, adjustable 4 link rear with adjustable panhard, fully rose-jointed
Brakes: Wilwood 2pot rear, Wilwood 4pot with BMW discs front,
Wheels: 13x9.5 3-piece Magnesium centre wheels, Dunlop 240-525-13 slicks
Interior: 18ltr fuel cell, Momo race seat
Weight: 669kgs

[img width=500]Specs Driver: Rick Bone Car: 1972 Datsun 1200 Coupe purpose built circuit car Body Mods: Fully seam welded, Extensive MANZ approved rollcage, fully adjustable carbon fibre rear wing, front splitter, lexan windows Engine: Datsun A15 (1500cc) non-crossflow pushrod, Cosworth steel crank, Carrilo rods, JE forged pistons, Titanium intake valves, competition triple valve springs, Yella Terra roller rockers, adjustable cam wheel, Nismo competition head gasket, 48mm SK Racing quad throttle bodies, tuned length 4 to 1 extractors, Bosch 044 fuel pump, custom alloy flywheel, Tilton twin plate clutch, 2 stage drysump oil pump, 10ltr Peterson dry-sump oil tank, Microtech computer, Max RPM 8800rpm Power: 207BHP Driveline: 5-speed gearbox with Nismo competition close ratio gear set, Datsun 1200 Ute diff with Nismo variable ratio LSD Suspension: Bilstein front shocks, Spax coil-over adjustable rear shocks, adjustable front & rear swaybars, adjustable 4 link rear with adjustable panhard, fully rose-jointed Brakes: Wilwood 2pot rear, Wilwood 4pot with BMW discs front, Wheels: 13x9.5 3-piece Magnesium centre wheels, Dunlop 240-525-13 slicks Interior: 18ltr fuel cell, Momo race seat Weight: 669kgs [/img]

Seems to have weber styled manifold with no velocity stacks on the throttle bodies.
Driver seems a big bloke definitely no lightweight for the 669kg datto Im starting
to feel it must have at least 190hp ate.

http://my105.com/classified.asp?id=14998
The car above is a bullet and has cbr1000 hp and has current 2a under 1600cc class record holder bathurst mt straight hillclimb 2010.

well setup cars with anything under 190hp seem to be enough hp to be at the top of u2ltr classes with a sub 700kg and excellent driving skills in most events.

Steve Newing also proved this with less hp so 207hp seems like a huge amount of horses for
something with such basic looking inlet with quad 48mm efi. A dyno sheet would be nice no
doubt. Does it really need a forged steel cosworth crank for 8500rpm? Dont the later A15
engines have forged cranks? If a suzuki g16b with 90mm stroke cast hollow crank can handle
250+hp stock is a cosworth forge really necessary? Nissan forged cranks are renown.

Reported 207 HP...we've yet to see an dyno report of any engine over 150 HP.

If we had drag racing terminal speed, the HP could be computed from the weight.

I do know that a full race A14 will make 175HP at 9500 RPM's , and that was close to 20 years ago and this was with 45 DCOE carbs. With the extra displacement, 48 mm ITB EFI and some development work 200 HP is possible. The problem being engine life wouldn't be more than 6 hours of run time. 100cc Karting engines will make 35HP but they need to rebuilt after every race.

The thread was originally what would a NA motor do, but it really needs to be separated into what's streetable and full race. In street trim I'd say 100-110 ATW before you start having issues like needing a 5/6 speed box and race gas. My old Yamaha RD350 ran an honest 12.60 1/4 mile but for a street bike it was on the ragged edge; needed to roll off the lights at 4000 RPM's or more, didn't like anything below 1/2 throttle etc. If we buzz an A-series to 12K it would likely make huge power but also be a Holy Hand Grenade.

Tom