Cubic inches for limited pro stock July 17, 2009 02:44PM
What are the max cubic inches for limited pro for the different organizations? Are they all pretty close? What is a good 4.1 turbo to run? Thanks.
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Re: Cubic inches for limited pro stock July 18, 2009 03:54PM
anyone?
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Re: Cubic inches for limited pro stock July 19, 2009 04:55AM
640
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Re: Cubic inches for limited pro stock July 19, 2009 06:29AM
Is that NTPA and Outlaws? Do the ppl pull a limited pro with same ci. ?
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Re: Cubic inches for limited pro stock July 19, 2009 07:38AM
I believe its 540
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Re: Cubic inches for limited pro stock July 20, 2009 06:56AM
Good turbo..............Holset HX82, Holset HC5A
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Re: Cubic inches for limited pro stock July 20, 2009 10:35AM
i heard ntpa might make limited pro stock 540 cubes for 2010
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Re: Cubic inches for limited pro stock July 23, 2009 09:34AM
540 would be great... but 640 is more likely. Sad
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Re: Cubic inches for limited pro stock July 23, 2009 03:54PM
It should be 640, it makes it fair for all colors, not just Deere and IH
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Re: Cubic inches for limited pro stock July 24, 2009 02:11AM
why would you make another class with a 640 cube limit? there is already a class for that motor and its called super farm. this is a limited prostock class give it limits. in my opinion 540 is to much. every color tractor has a motor that is close to the 505 cube limit, that is what limited pro was set up for 15 years ago. that is why you can run a 3x4 charger on these tractors that is how you make your power not in cubes. i would love to see the original limited pro 8200# class make its way towards ohio but the closer it gets the more rules are being changed. just my opinion.
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Come on NTPA MAKE A DECISION July 24, 2009 04:08AM
If the NTPA would make up there minds and set a cubic inch rule that we could build to it would help. First it's 640 then 540 then 510 then 540 then 640. Come on NTPA MAKE A DECISION. No wonder we can never get this this class started. I'll mkae the decision for ya; 540, 8500 lbs, 4.1 charger, 24.5s, Lets GO!!!!!!!
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Re: Come on NTPA MAKE A DECISION July 24, 2009 06:54AM
540, the extra cubes cost money. If you want to build 640 or 680 there are already two classes.
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Re: Come on NTPA MAKE A DECISION July 26, 2009 06:05PM
Hello, Hello, anyone home ????
The limit is in print in the NTPA rule book.
Been there.
Not liked by all, but it is there.
Start building.
Or are you just sitting at your 'puter in your underwear complaining?
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Re: Come on NTPA MAKE A DECISION July 27, 2009 02:56AM
Yeah im home !!!!!!!!!!!!!!!!!!!!!! it was in the 2008 rule book and i started building for it then they changed it. So I was not sitting at my comp in my underware I was doing some thing till someone changed it.
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Re: Come on NTPA MAKE A DECISION August 10, 2009 04:52PM
Thumbs Up I like this idea !!
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Re: Come on NTPA MAKE A DECISION August 10, 2009 04:53PM
Let`s go idea
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Re: Cubic inches for limited pro stock July 24, 2009 08:43AM
i beleive the 505 cu with the 3X4 charger is the way to go. Dont need all those machinists making more money. Im not in the business of jump-starting the economy. There is super farm and prostock if you want big cubes. Light supers are fun to watch and they are only 505. we have a 505 3X4 class around here....central wisconsin truck pullers and we have a points fund and everyone who pulls in it or watches it LOVES it. or you can run a 3X3 with 506 cu or bigger. The two are very competetive together.
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Re: Cubic inches for limited pro stock July 24, 2009 02:07PM
505-510 is the way to go with and charger that would run with or over a 640 superfarm
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Re: Cubic inches for limited pro stock July 25, 2009 12:54AM
Well if NTPA, PPL ,ATPA and all the other circuits could at least get the rules for cubic inch the same that would be awesome. In order for the sport to survive there needs to be some common ground, if you build a tractor for one club at 505 cubes and the other club has a 540 cubes allowance and still another club has a rule allowing 610 cubes it will not take long and you will realize that you are not going to the pulls outside your club you built your machine for. The crowd loves it when you can go to a pull in lets say Ohio and see a puller from MN or WI and the same goes the other way. But with the way all the rules are you basically have everyone staying in the local area and the sport cannot grow as the populary is not growing.

Diesel Truck pulling is one of the fastest growing sports out there. Why is this? it is because of the pullers working togeteher to develop common rules and classes etc. And they have several maginzines that cover the sport and promote the sport. Maybe the tractor pullers need to do this also
I know there are a few puller magizines out there, but unless you order the magizine or happen to go to Tractor Supply or farm supply store you will never see a magizine promoting the sport.

The fans want to see close pulls and in order to do this I would highly recommend capping the cube limit at 540 therefore all colors can be represented. I would to go to a pull where you can see something more then red and green myself. This is my 2 cents, I know that everybody's budgets are tight and building HP costs money. But the intend of the limited pro stock was to get pullers into state and regional level pulling at a reasonable cost and to also put on a good show.

The NTPA does not have any long term plans of taking the class to a Grand National level at this time from what I heard. And for the time being the class is only running at a State level and may never get off the ground unless the pullers and the clubs like PPL, NTPA and ATPA can sit down and look at getting this class and all the classes closer in rules and specs.
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Re: Cubic inches for limited pro stock July 26, 2009 07:18AM
540 cubes
8500-8800 lbs
oem heads
any int and ex manifolds
any turbo (no sleeve, restrictor, or other type of limits)
no i-coolers
p-pump ? or open pump?

the no turbo limit would help keep the builders cost out of the class
as far as a pump limit, either be a 13 mm p-pump or go with any pump

try to keep the limits to a minimum, this may sound stupid, but in the the long run it will make for a less expensive class
the reason being that a turbo limit of any kind will result in an upgrade or new one every year, similar to the SF
the p-pump will be high dollar in a couple years, and probably lack durability= $$$

these rules are similar to the east coast tractors other than the fuel pump limit
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Re: Cubic inches for limited pro stock July 26, 2009 03:59PM
How do you figure that open turbo keeps the builders out of it? Last I heard the open Pro turbos cost way more than any other turbo out there & they come out with a bigger & badder one every year for their favorite customers. The only turbo rule that keeps the builders out is a box turbo rule. Not saying this class should have one but expecially if you allow billet & Sigma pumps they will be turning 5" chargers. Except for the icebox I believe your rules are pretty close to theirs.
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Re: Cubic inches for limited pro stock July 27, 2009 02:58AM
P pumps only why spend $10,000.00 to $15,000.00 on a injection pump thats for pro stock- super stock
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Re: Cubic inches for limited pro stock July 27, 2009 07:54AM
540 ci
8500 lbs.
OEM heads and manifolds
4.1 comp. any size ex. OR 3x4 (see bottom)
NO coolers
Any P pump
24.5's
Cast rear-ends


4.1 charger would be more exciting but would drive the cost up more
-need better air flow
-more expensive turbo
-more breakage
-engine
-trans
-rear-end
3x4's are still exspensive but would be competitive with superfarm and at a local level will help numbers.
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Re: Cubic inches for limited pro stock July 27, 2009 01:27PM
in 2008 i built one and ran the state and i pulled in the two pulls they had but no one had a chance to build one to fit the class. there were only two tractors in the class.
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Re: Cubic inches for limited pro stock July 27, 2009 01:41PM
I was in the process of building one fo the 09 season in Wisconsin but now I have a bunch of useless engine parts. Now im pulling SF but if they straighten the cubes back down to 505 or evan 540 I WILL build another tractor. Would you come back BeaverHunter?
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Re: Cubic inches for limited pro stock July 27, 2009 03:13PM
Make the NTPA Pro Farm class 505, ~3.5 x ~4 (whatever is an ideal version of the HX82), 8500 lbs., 20.8, any manifolds, Regional National only. Then have the Lim. Pro class 505 - 540, 4.1 x 4.5, 8500 - 9000, 24.5, any manifolds, Grand National and Reg. Nat.
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Re: Cubic inches for limited pro stock July 28, 2009 05:50AM
yes id come back we started our club with central truck pullers. 505 or smaller can run a 3X4 charger anything over 505 you have to run a 3X3. We have a points system that this year you will receive between 100 and 150 dollars for each hook above the final payout. Its a great club and the fans really enjoy it.
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Re: Cubic inches for limited pro stock July 28, 2009 10:03AM
Where can a guy get some info on the central truck pullers. Where are they based out of. I live in central wisconsin and am in the process of putting a limited pro together. Most of what i have left is to build a new engine, and i don't know what way to go, because i'm worried the cubic inch limit will change again. Sounds like maybe a club like this would be a good place to pull until things get going.
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Re: Cubic inches for limited pro stock July 28, 2009 02:50PM
Call me.......Duane Bauer. I can help answer any questions you may have. 715-659-4101 CELL- 715-207-9742 Please call after 7 pm
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Re: Cubic inches for limited pro stock July 29, 2009 01:16PM
What are the exact measurements of the HX60? What are some good turbos that are bigger than a 3x4 but smaller than a 4.1? Thanks!
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Re: Cubic inches for limited pro stock August 03, 2009 05:17AM
I don't have one & don't have a source for Holset wheel sizes but there probably are more than one wheel available.
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Re: Cubic inches for limited pro stock July 30, 2009 05:31AM
ITPA Limited Pro limit is 466ci
Can't run 4.1 turbo
ITPA MAY make a Super Farm 4.1 turbo class for 2010 season.
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Re: Cubic inches for limited pro stock July 30, 2009 11:12AM
How big is the ITPA turbo? Putting a 4.1 on the Super Farms would solve at least one problem. Then Limited Pro could be 505 with any sensible size turbo bigger than 3x4 (i.e. 3.4, 3.5, 3.6).
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Re: Cubic inches for limited pro stock July 30, 2009 11:23AM
ITPA is a 3x4 turbo.
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Re: Cubic inches for limited pro stock August 01, 2009 03:47PM
i really like seeing how many guys are interested in the 505 cube limit! i was wandering why everyone says to go to 540 so all colors can pull why can't all colors make the 505 limit??? what color tractor doesn't have a motor available?? just because the limit is 505 dosent mean you have got to have 505!! cubes arn't the answer. if an organization around would run the 505 class 3x4 24.5 p-pump class i think people would be shocked how many tractors would show up to hook. and how good a show they could put on.
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Re: Cubic inches for limited pro stock August 03, 2009 04:55AM
who is in charge of the lim pro stock in the ntpa
how can you get a hold of him
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Re: Cubic inches for limited pro stock August 03, 2009 05:49AM
Jeremy Smith (330) 421-0631 is the Divisional Chairman for the NTPA. The NTPA website has all the Board and Divisional Committee members contact info.
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Re: Cubic inches for limited pro stock August 11, 2009 06:08AM
640 with a 4.1.........gee why not go 4.8 and they could reinvent prostock oh wait that is a prostock
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