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UHMW Wear Ring for Sportjets... WOW!!
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SouthIdahoGary



Joined: 15 Jun 2005
Posts: 295
Location: Wilder, ID, USA

PostPosted: Thu Jul 13, 2006 11:22 am    Post subject: Reply with quote

The UIM ruleset for SJ states:
For “SP 2500 Sport Class” the only engines allowed to race are two
stroke engines up to 2500 cc and they can not be modified.
Hull: Any shape and material, the minimum length shall be 3.96 mt (13
ft).
Machinery: The engine must be of a “Standard Production Line” the
engine must be two strokes, V 6 cylinder, with a maximum of 240 HP,
Engine limitations:
- Maximum oversize piston diameter allowed for overhauled engines is
0.020”
- No modifications in the Cylinder Block Assembly; Reed Block; Cylinder
Head Assembly; Crankshaft; Pistons; and/or Connecting Rods are
allowed; All these engine replacement parts or parts contained herein
must be of a standard production “off the shelf line items” available
from the manufacturer.
- The whole exhaust system shall be the “standard” as included in the
manufacturer´s catalogue, no modifications are allowed.
- All boats must have a Muffler Assembly in the exhaust system.

Propulsion:
- The Jet Drive must be of a “Standard Production Line”
- All the Jet Drive replacement parts or parts contained herein must be
standard production “off the shelf line items” available from the
manufacturer.

Jet Pump limitations:
- No modifications in the transmission or in the housing of the jet pump
are allowed.
- Impeller: shall be of a “Standard Production Line” off the shelf line
item. No special production or impellers from other manufacturers are
allowed.
- No modifications in the Nozzle and Rudder design, they should be
kept as supplied by the manufacturer. The use of separators and/or
wedges to modify the angle of the water output are allowed.
- The reverse system is NOT compulsory
.

In the AWJA SJ is still a demonstration class, but the suggested guidelines are:

Sport Jet Class (SJ) Addendum
Class designed as an entry level class with propulsion being the same type and power level.
For “SJ” Sport Jet Class the only engines allowed in this class are two stroke engines and they can not be modified. The motor/pump shall be a commercially available package unit. The boat / entry / crew must conform to all AWJA safety and operational rules i.e. roll bar, seat belts, life jackets, helmets, see also EQUIPMENT sections in AWJA and APBA Rule 7. Numbering: All boats shall be numbered according to the following numbering scheme:
Class to have numbers consisting of SJ01-SJ50. It is required that each boat in this class include its class designation –SJ- as part of its displayed number.
Hull:
-Rigid, any shape and material, NO glass windscreen, the MINIMUM length shall be 13 feet.
Machinery:
-The engine must be a standard production line unit. The engine must be of two stroke design, V cylinder configuration, 6 cylinder, with a maximum of 250 HP as stated by the manufacturer in their published literature.
Engine limitations:
-Single engine only
-Gasoline for fuel ONLY. No power enhancing additives.
-Factory oil injection to remain operational, 2 stroke oil only, no power enhancing additives.
- Maximum oversize piston diameter allowed for overhauled engines is 0.020”.
- No modifications in the cylinder block assembly; porting; reed block; cylinder head assembly; crankshaft; pistons; and/or connecting rods are allowed; All the engine replacement parts or parts contained therein must be standard production “off the shelf line items” as manufactured and distributed by the original manufacturer.
- The whole exhaust system shall be “standard” as delineated / included in the manufacturer’s catalog, no modifications allowed.
- All boats must have a muffler assembly in the exhaust system.
-Ignition/computer control to be standard. No reprogramming or alteration except within allowed factory tuning specifications.
Propulsion:
- The Jet Drive must be the standard production line unit for the package.
- No modifications in the transmission or in the housing of the jet pump are allowed. The gear ratio must be the original factory specification for the unit.
- All the Jet Drive replacement parts or parts contained therein must be standard production “off the shelf line items” as manufactured and distributed by the original manufacturer. Only exceptions allowed are fasteners and the following:
-Impeller-Any
-Nozzle-Any
-Wear Ring-any composition and/or design allowed.
-The use of separators and/or wedges to modify the angle of the water output are allowed.
-The reverse system is NOT MANDATORY.

We were kind of hoping that maybe the UIM would rethink "their" ruleset and open it up a little Wink to allow innovation in hulls and in the water processing part of the pump and that the good ole' racing spirit to be set a little more free Very Happy

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"faster, Faster, FASTER until the thrill of speed overcomes the fear of DEATH"#163 "Tuff-n'-Nuff"


Last edited by SouthIdahoGary on Thu Jul 13, 2006 3:00 pm; edited 2 times in total
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gary weaver



Joined: 05 Jan 2006
Posts: 20
Location: albany oregon

PostPosted: Thu Jul 13, 2006 2:43 pm    Post subject: insert Reply with quote

If I understand the U.I.M. rules the insert is illegal as it is considered a pump modification. However I think some of these rules need to looked at as all other classes can usually run with what they brung.
gw

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SouthIdahoGary



Joined: 15 Jun 2005
Posts: 295
Location: Wilder, ID, USA

PostPosted: Thu Jul 13, 2006 3:10 pm    Post subject: Reply with quote

As I read and understand the UIM rules, ANY deviation from the way Mercury builds and ships the unit is an illegal modification. The stainless wear ring and/or a 3 blade impeller would invalidate an entry in an UIM sanctioned race or a race run under the UIM ruleset.
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"faster, Faster, FASTER until the thrill of speed overcomes the fear of DEATH"#163 "Tuff-n'-Nuff"
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WILSON



Joined: 17 Jun 2005
Posts: 352
Location: Mexico City

PostPosted: Thu Jul 13, 2006 3:47 pm    Post subject: Reply with quote

That's right. Under the current UIM rules, both the Teflon (UHMW) wear ring and the super duper stainless impeller are ILLEGAL.

When the class was born, the idea was precisely to avoid such things, that usually come as special items not readily known to all the racers.

Please bear that in mind if you are planning to come to the worlds in Mexico.

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givermoregas



Joined: 13 Jul 2006
Posts: 10
Location: Mvl

PostPosted: Thu Jul 13, 2006 7:14 pm    Post subject: Reply with quote

Wilson, please clarify, if UHMW liners are not allowed then neither would be the stainless. right? Question Question

Does that mean that those who want a competitive advantage within the UIM rules install brand new pump components before a race.

The stock aluminum pump housing does wear out quickly.
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2jokejet



Joined: 21 Dec 2005
Posts: 27
Location: Pearl Beach Australia & Part time New Zealander

PostPosted: Thu Jul 13, 2006 9:31 pm    Post subject: Reply with quote

allblowdup wrote:
Yes it is because the tolerance can be kept a lot closer. We have seen new impellers and housing's with only 15 hrs on them with .030 clearance. We have had some of ours with 200 hrs on them and only have worn to a .010 clearance. We do find also that because of the less slippage even at cruise they seem to slightly quieter also.


thank you for the information..
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shallowman



Joined: 03 Apr 2006
Posts: 199

PostPosted: Thu Jul 13, 2006 11:05 pm    Post subject: uhmw wear rings Reply with quote

you know what is amazing is that I hold the patent on this product and I only made one that went to the USA last year (this year I have lots)so when did they have this ruling it must have been this winter or else
someone is not telling the truth on the UHMW wear rings
not being legal to run and yes in most cases your boat will run faster
is that a bad thing still only 240hp stock engine
so whats the problem I wonder

Let,er Buck Twisted Evil
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SouthIdahoGary



Joined: 15 Jun 2005
Posts: 295
Location: Wilder, ID, USA

PostPosted: Fri Jul 14, 2006 8:15 am    Post subject: Re: uhmw wear rings Reply with quote

shallowman wrote:
so when did they have this ruling


The UIM rules have always had the restriction, since the inception of the SJ class.

There have been rumblings that some of the entrants that have participated in UIM sanctioned events and events operating with UIM rules, have in fact been "illegal". (Three blade impellers, non stock wear rings, non-Mercury nozzles and gear changes in the transmission are the most often mentioned glossed over violations) I do not believe that there has been a protest or even a disqualification at tech. If the rules are not enforced, they are just a paper tiger. Any mods to the package unit as manufactured by Mercury, with the exception of wedges and taking the reverse bucket off, are not supposed to be allowed to compete under the UIM rule set.

In the US, everyone that wanted to run an SJ had done pump / impeller /nozzle mods. We chose to allow these modifications to stand as we tried to decide, as a group, whether to sanction the class. With the demise of the 240 as a commercially produced piece, we also opened it up to allow anything that was less than 250HP so as to allow the OPTIMAX units. It is still a demonstration class here in the US. We will try again this fall at the annual meeting to get an SJ class recognized in the US Series. Probably with our own rule set and NOT the more restrictive UIM regs.

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"faster, Faster, FASTER until the thrill of speed overcomes the fear of DEATH"#163 "Tuff-n'-Nuff"
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2jokejet



Joined: 21 Dec 2005
Posts: 27
Location: Pearl Beach Australia & Part time New Zealander

PostPosted: Fri Jul 14, 2006 5:34 pm    Post subject: . Reply with quote

if SJ class was to allow the everyday man to compete on a small budget, get more into the sport and race on a level playing field then it's a no brainer for me. stay with the UIM rules and have no mods whatsoever. let everyone really compete as 'drivers' and not who has an extra 5 or 10mph.

my 0.14c (corrected for exchange rate!)
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gary weaver



Joined: 05 Jan 2006
Posts: 20
Location: albany oregon

PostPosted: Mon Jul 17, 2006 9:41 am    Post subject: sj impeller Reply with quote

Wilson/South Idaho Gary
If the uim rules state a standard production line item, off the shelf item please clarify why not a 3 blade stainless impeller from Mercury. That is what I am presently running and it is a off the shelf Mercury product.
At least that is where I bought it.
Wilson, I am planning on running in Mexico and would like your e-mail/phone number. Need to make plans and need some info.
Thanks,
gw

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SouthIdahoGary



Joined: 15 Jun 2005
Posts: 295
Location: Wilder, ID, USA

PostPosted: Mon Jul 17, 2006 9:57 am    Post subject: Re: sj impeller Reply with quote

gary weaver wrote:
Wilson/South Idaho Gary
If the uim rules state a standard production line item, off the shelf item please clarify why not a 3 blade stainless impeller from Mercury. That is what I am presently running and it is a off the shelf Mercury product.
At least that is where I bought it.
gw


The UIM rule set indicates that replacement parts must be production line items.
The 240 came with a 4 blade.
http://www.mercurymarine.com/mercury_240_efi_jet_drive

The 3 blade item is for the 175...
http://www.mercurymarine.com/mercury_175xr2

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"faster, Faster, FASTER until the thrill of speed overcomes the fear of DEATH"#163 "Tuff-n'-Nuff"
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WILSON



Joined: 17 Jun 2005
Posts: 352
Location: Mexico City

PostPosted: Mon Jul 17, 2006 11:24 am    Post subject: Reply with quote

OK.

If the three blade impeller is made by Mercury, and can be purchased from any Mercury dealer, then it's considered "Off the shelf line item", therefore it's legal.

If you could post the part number, it could help other racers. If you want to keep that secret, it's OK. I would advise to have the part number available when the protest comes or the judges ask.

The plastic wear ring is not available from Mercury. This makes it illegal.

Gary: I PM you my personal information.

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givermoregas



Joined: 13 Jul 2006
Posts: 10
Location: Mvl

PostPosted: Mon Jul 17, 2006 6:57 pm    Post subject: Reply with quote

How come I cant find anywhere in the UIM 900 rules the word "Mercury" but instead it always says "Manufacturer".

So who is the manufacturer Question , that these judges will have to base their decisions on. And how do they do that when their rule book doesn't say Mercury. Rolling Eyes
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MISSINGSASK



Joined: 06 Jul 2006
Posts: 2
Location: EDMONTON

PostPosted: Mon Jul 17, 2006 10:00 pm    Post subject: UHMW Wear Ring for Sportjets Reply with quote

New to running rivers, but I'm running a 200SJ and was just told that I should be going to SS. With only 40 hours on the original, I'm already noticing a slip in performance. Now I'm hearing another story, but i like what I'm hearing.

How fast can you change this out if I bring it by?

Thanks

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allblowdup



Joined: 20 Jun 2005
Posts: 135
Location: Grande Prairie

PostPosted: Tue Jul 18, 2006 8:15 am    Post subject: Reply with quote

It takes a few days to get the work done. We have not set up an exchange program yet because there are a few different types. You would have to ship your housing and impeller and we should have it back to you in the same week.
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