IHRA Engine Blueprint Specs ????

[442OLDS]

Originally Posted by Chris1529

Since NHRA publishes a list of acceptable stock/superstock replacement rods, I figure most professional engine builders go with one that is on the list for a given combination.

If someone builds two identical engines, with the exception of stock legal rods in one, and superstock legal rods in the other, how much performance gain could be expected?

Its not just the rods,its also the pistons:

Only the top (combustion chamber side) of the piston has to "LOOK" correct when viewed from an assembled short block. The dish/dome still have to measure correct. They dont care what it is like below the deck (moved rings, thinner ring pack, lite pins, lite pistons, valve relief location and depth, etc.).


Performance gain?

I would think the IHRA car could beat the NHRA car in a heads up!

[Chris1529]

This is just my guess, but I figure the majority of people building or running a regular stocker in IHRA can or do run it in NHRA as well. I don't think there are too many purpose built IHRA regular stockers.

[NewHemi]

I talked to Mike Baker the other day about this, and he said that the NHRA specs which are posted on the NHRA site, are what is used. But because they are copyrighted material, he just points forlks to them, rather than simply copy them to the IHRA website which would be wrong to do.

But those specs pretty much apply.

David
The New Hemi Guy

[Lew Silverman]

Originally Posted by 442OLDS

Its not just the rods,its also the pistons:

Only the top (combustion chamber side) of the piston has to "LOOK" correct when viewed from an assembled short block. The dish/dome still have to measure correct. They don't care what it is like below the deck (moved rings, thinner ring pack, lite pins, lite pistons, valve relief location and depth, etc.).

Maybe I'm missing something here, but part of the engine specifications are piston, piston ring and pin weights. So other than having a certified replacement piston (published by manufacturer/part number) as listed in the guide, you can't modify them, at least in Stock Eliminator.

Lew

[Chris1529]

Originally Posted by Lew Silverman

Maybe I'm missing something here, but part of the engine specifications are piston, piston ring and pin weights. So other than having a certified replacement piston (published by manufacturer/part number) as listed in the guide, you can't modify them, at least in Stock Eliminator.

Lew

Thats what I thought.

[magnumv8]

I hate to burst your bubble, but when I was getting ready to build my "stocker" engine the VERY well known builder I called quoted me $95.00 each for the "boxed stocker" pistons or if I wanted to be competitive, $145.00 each for the same pistons but lightened.....confused me, so I am still on the fence,almost $1200.00 just for pistons.....


D L Rambo

[Jim Woods]

You cannot alter pin or ring location, no excessive lightening, no thin ring package must have correct approved # on top of piston.must have same configuration as oem along with same weight as original. pins may be shortened if using full floating option

[Ed Carpenter]

when it comes to HP ratings make sure you ask IHRA what your combos HP is. They are not always the same. My HP rating with NHRA is 299 and its 295 with IHRA. Ed