|
Does anyone have a copy of the rules for component chassis. I have a rulebook that is a cpl of yrs old and are looking for an up to date set.
Any help would be appreciated. Thanks in advance. 
antechwire@bellnet.ca |
|
Looking for what NTPA 2009 rulebook says. Distance from rear to back of the motor . Height of engine crank up and down.
Thats all just want the current one. Thanks K 
|
|
Registered: 03/25/2008 Posts: 2,526 |
Don't have the book in front of me, but NTPA and PPL both say:
- From back of motor to centerline of rearend to be no further than 60" If my memory is correct, the NTPA crank height wording is a little confusing. PPL's wording is clear: Front nose of the crankshaft can be no lower than 4” of the center of the rear axle. If my memory is correct the NTPA has some fractional drop allowed, but I think it works out to about the same 4” measurement. The crank height is a little difficult to quantify. If you build right to the limit with 8-ply tires… and then you decide to go with a set of HP’s you might just be illegal. If you get different (smaller) front tires then you might just be illegal. Changes in tire pressure and weight can drastically change the height of the nose of the crank. The reaend (pinion height)mwill affect the slope of the driveline. The length of your block will change the slope of a driveline… a chassis designed for a short block like a AC 301 could be built right at the edge of legal, but if the owner put in a longer block like a 426… the nose of the crank will be further out, and thus lower down = illegal. Even changing from a narrow front rim to a wider front rim with the same size front tires may be enough to make a tractor illegal. Even a driveline built exactly horizontal in a shop on an unweighted chassis will have a slope once 1000 lbs get put on the nose! I guess the moral of my ramblings is don’t build too low… but build low enough to keep the center of gravity down. I think the intent of the rule is that no one put a drop box transmission in a component tractor. If you are close on your motor I don’t think anyone is going to raise any complaints. If they do, let some air out of the rear tires, and pump the front tires up, move all the weight back and have then re-measure. Jake Morgan Owner, PULLOFF.COM Independent Pulling News This page is a free service. The cost is covered out of my pocket. It takes a great deal of time and a fair amount of money to keep this website going. Donations for: photos, classified ads, forum discussion, etc... are appreciated. Side Note: We are no longer accepting PayPal donations. They have changed their terms of service and stated they would fine PayPal users for spreading "misinformation" and "hate, violence, racial or other forms of intolerance that is discriminatory". PayPal did not provide definitions for some of these vague terms. Woke corporate policies regarding "misinformation" could result in an automatic fine of $2,500 which would have been removed directly from the customer’s PayPal account. PayPal did backdown from some of their policies but quietly implemented portions of them in later terms of service. A financial institute has no right to monitor social media accounts or speech. This is unacceptable and I'll no longer do business with PayPal. |
|
Registered: 03/25/2008 Posts: 2,526 |
|
Posts: 347 |
|
Posts: 508 |
|
Posts: 347 |
|
Posts: 508 |
