Clarify What is meant by Non-stock induction (SP)

Discussion related to classification of cars in the NEHA series.
User avatar
KevinGale
Posts: 836
Joined: Thu Sep 04, 2003 3:01 pm
Location: Sutton, NH

Re: Clarify What is meant by Non-stock induction (SP)

Post by KevinGale »

walterclark wrote:My take is valves and cams dont constitute "non-stock induction". Manifolds, throttle bodies, etc. do.
I agree with that. So the rules don't force the car into S5 but I stil think that is the right thing to do.
User avatar
walterclark
Posts: 1442
Joined: Sun Feb 08, 2009 12:57 pm
Location: Dover, MA.
Contact:

Re: Clarify What is meant by Non-stock induction (SP)

Post by walterclark »

I googled things like "engine induction system" to get an idea of what others refer to when using the term induction in regards to engines.

I always saw carburetors and throttle bodies included. Mostly I saw intake manifolds. Sometimes I saw air filters/cleaners. Occasionally I saw the path between the filter and TB. Once I saw the path include from the intake manifold flange on the head up TO the intake valve - the in-head extension of the intake manifold. I never saw reference to cams or valves as part of induction.

I think we generally think of air filters as free.

The point I am making is we (the technical committee) probably need to settle on and publish a definition of where "induction" begins and ends and where "exhaust" begins and ends relative to our "non-stock" statement in classification. So someone building a car near a class limit knows at what point they are "non-stock" in these areas.
The older I get the better I was.
User avatar
Rabbit Farmer
Posts: 2260
Joined: Wed Jun 25, 2003 11:37 pm
AntiSpam: No
Location: Earth
Contact:

Re: Clarify What is meant by Non-stock induction (SP)

Post by Rabbit Farmer »

KevinGale wrote:
walterclark wrote:My take is valves and cams dont constitute "non-stock induction". Manifolds, throttle bodies, etc. do.
I agree with that. So the rules don't force the car into S5 but I stil think that is the right thing to do.
I also agree with Walter's comment. I don't think we includeed in the classes any performance benefit for types valves. Number of valves are covered. Number of cams are covered. The type of either one (valves or cams) is not covered.

The intent of Unprepared is esstentially no changes beyond minor modificaitons. If you are opening the engine to change something, you are not Unprepared.
Go Fast VW & Audi parts at FastAddiction.com
User avatar
walterclark
Posts: 1442
Joined: Sun Feb 08, 2009 12:57 pm
Location: Dover, MA.
Contact:

Re: Clarify What is meant by Non-stock induction (SP)

Post by walterclark »

Rabbit Farmer wrote: I also agree with Walter's comment. I don't think we included in the classes any performance benefit for types valves. Number of valves are covered. Number of cams are covered. The type of either one (valves or cams) is not covered.

The intent of Unprepared is essentially no changes beyond minor modifications. If you are opening the engine to change something, you are not Unprepared.
Steve, you do realize we are talking about the Street Prepared class, right? Modifying any of this stuff would take one out of U...well maybe not an air filter or cat-back.
The older I get the better I was.
User avatar
Rabbit Farmer
Posts: 2260
Joined: Wed Jun 25, 2003 11:37 pm
AntiSpam: No
Location: Earth
Contact:

Re: Clarify What is meant by Non-stock induction (SP)

Post by Rabbit Farmer »

I do now... :oops:

The valve type and cam type comment is still correct....
Go Fast VW & Audi parts at FastAddiction.com
steve108
Posts: 4
Joined: Wed Oct 13, 2010 8:17 pm
AntiSpam: No

Re: Clarify What is meant by Non-stock induction (SP)

Post by steve108 »

Okay, thank you for the comments. Yes, we are talking about street prepared, which states, "Engine/ driveline modifications
are allowed."

I would agree that the rules could be more clear, perhaps a list of definitions would help.

Ultimately, of course, changing cams is unlikely to make an enormous difference, but it all adds up.

Thanks again for the comments, interested to hear other points of view.
Post Reply