IHRA S/S engine ?

rod · 02-03-2010, 11:34 AM

are IHRA engines like NHRA, in that the pistons and carb have to be factory legal or like [old] AHRA where only the engine bore must be factory to car legal?
thanks rod

Ed Wright · 02-03-2010, 02:41 PM

Same as NHRA.

Bench Racer · 02-04-2010, 08:51 PM

Depends on if you are talking "IHRA superstock production" or" IHRA super stock" the production engines are simular to the old modified production engines and run at weight per cubic inch. In the early years they were classed as formula 1 through formula 4. Formula 1 was multiple carb, formula 2 was single 4bbl, formula 3 was 2bbl. limited to a 650CFM Holley, and formula 4 was NHRA legal engines that run at a horsepower to weight class. I think the multiple carb class has been eliminated, and unless memory serves me wrong all you are limited to in production superstock is a carb of 500 CFM in the two bbl class. and the only thing checked is stroke and cubic inch. I am not sure what the "formula 4 NHRA" engine cars are called, I assume just superstock. IHRA does not always keep up with NHRA with horsepower changes when the lead foot prevails at a NHRA track. Hope this confused rambling helps. Don Jackson

02-03-2010, 11:34 AM	#1
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 313 Likes: 0 Liked 20 Times in 15 Posts	IHRA S/S engine ? are IHRA engines like NHRA, in that the pistons and carb have to be factory legal or like [old] AHRA where only the engine bore must be factory to car legal? thanks rod

02-03-2010, 02:41 PM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: IHRA S/S engine ? Same as NHRA. __________________ Ed Wright 4156 SS/JA

02-04-2010, 08:51 PM	#3
Bench Racer Member Join Date: May 2002 Location: Green Creek (Tryon) North Carolina Posts: 331 Likes: 69 Liked 99 Times in 21 Posts	Re: IHRA S/S engine ? Depends on if you are talking "IHRA superstock production" or" IHRA super stock" the production engines are simular to the old modified production engines and run at weight per cubic inch. In the early years they were classed as formula 1 through formula 4. Formula 1 was multiple carb, formula 2 was single 4bbl, formula 3 was 2bbl. limited to a 650CFM Holley, and formula 4 was NHRA legal engines that run at a horsepower to weight class. I think the multiple carb class has been eliminated, and unless memory serves me wrong all you are limited to in production superstock is a carb of 500 CFM in the two bbl class. and the only thing checked is stroke and cubic inch. I am not sure what the "formula 4 NHRA" engine cars are called, I assume just superstock. IHRA does not always keep up with NHRA with horsepower changes when the lead foot prevails at a NHRA track. Hope this confused rambling helps. Don Jackson