SyTy's info on www.nhra.com

[MikeRenz]

Just looking up some rules, and noted that they have our trucks listed as 280hp

1991:
stock Syclone time is 12.61

1992:
stock syclone time 12.85
stock typhoon time 13.93

1993:
apparently chevy only made Camaro's this year, becuase thats the only thing on the sheet.

The different excel sheets can be found here:
http://www.nhra.com/tech_specs/classification/classfiles/1991CHEV.xls
http://www.nhra.com/tech_specs/classification/classfiles/1992CHEV.xls
http://www.nhra.com/tech_specs/classification/classfiles/1993CHEV.xls

just found this interesting.

 

[MikeRenz]

also found some more info:

1991 GMC Info:
http://www.nhra.com/tech_specs/engine/blueprints/GMC-91T.rtf

Issued:        24 June 1995 
Revised:  
Bulletin #:    GMC-91T   Page 1 of 1               

Specifications for the   1991 GMC Truck engines.


H.P. Disp.	C.R. Ind. Make Model/Transmission	Manifold	R.R.	Lifter	Head cc                

280  262	10.1 TBI  AC/Roch	NA		14097274	1.5	H/R	63.1



               Deck	Piston                   
H.P. Disp.      Cl 	Type		Height   Vol		Valves	Cam Lift	Springs                    
                                                                                                     
280  262 	.014	Dish w/notches .060	7.78 cc     1945/1505  350/385        Outer w Damper



H.P. Disp.     Gasket    Head Cast

280  262       .016      10144103,14094768

1992 GMC Info:
http://www.nhra.com/tech_specs/engine/blueprints/GMC-92T.rtf

Issued:        25 May 1995  
Revised:  
Bulletin #:    GMC-92T   Page 1 of 1                    

Specifications for the   1992 GMC Truck engines.


H.P. Disp.	C.R. Ind. Make Model/Transmission	Manifold	R.R.	Lifter	Head cc                

280  262  	10.1 TBI  AC/Roch        NA       	036-R    	1.5 	H/R	63.1



               Deck	Piston                   
H.P. Disp.	Cl  	Type     	Height	Vol		Valves	  Cam Lift	Springs                    

280  262       .014	Dish w/notches	.060	7.78 cc		1945/1505 350/385	Outer w Damper



H.P. Disp.     Gasket    Head Cast

280  262       .016      10144103

 

[Six-is-Enough]

Just looking up some rules, and noted that they have our trucks listed as 280hp

1991:
stock Syclone time is 12.61

1992:
stock syclone time 12.85
stock typhoon time 13.93

These are not their ET's but their Power To Weight Factor. Which determines the class it fits. It is GMC Shipping weight divide by the NHRA HP Factoring(280).

ie:

A/ Fuel Injected is a 8.00-8.99 Class
B/FI 9.00-9.99
C/FI 10.00-10.99
D/fi 11.00-11.99
E/FI 12.00-12.99 (Class Syclone fits in E/FIA A is for automatic)
F/FI 13.00-13.99 (Class Typhonn fits in F/FIA)

Min Weight is factored HP times bottom weight break of class plus 170 lbs for driver. Syclone To run E/FIA 280 hp * 12 + 170=3530 lbs

If a vehicle out performs it factory HP rating it will be raised by NHRA.
For example a LS1 F-body was factory rated at 305 is currently factored at 349 HP by NHRA.

 

[Six-is-Enough]

1993:
apparently chevy only made Camaro's this year, becuase thats the only thing on the sheet.

GM has to send in the numbers to NHRA to get them listed in the class guide. Apparently GM did not see the need to send anything for 93 but a camaro. Sometimes if a guy is willing to work at it they can get a manufacturer to send old numbers in. Sometimes.....