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ARC R12 Touring Car

Old 01-30-2020, 03:24 PM
  #31  
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I'm confident we will have some positive news here after the weekend, first week of February I'm sure questions will be getting answered here soon. I know our loyal ARC family is a little anxious and has been waiting patiently for some more news (release date) or even some pics. ARC is very appreciative of your loyalty and continued patience while waiting for the new car. ARC is in the final stages of testing and we are excited to bring everyone a new design, just as much as everyone is excited to receive the new car. Thanks Everyone!!
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Old 01-30-2020, 06:50 PM
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Update: All new center (20T) pulley design for the R12 allows for both front/rear drive belts on a single pulley. This helps with centralizing the drivetrain as well. With the pulley made of a composite material, this insures minimal friction and less rotating mass. The new design makes for an easy spur replacement without removing the layshaft pulley.

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Old 01-31-2020, 06:23 AM
  #33  
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Tamiya 415 had that center pulley design back in the day with both the belts on the same pulley
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Old 01-31-2020, 08:02 AM
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That lock ring...needs to go....those things are horrible.
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Old 02-02-2020, 01:38 PM
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Mechanically valid solution, as you are not changing pulleys very often... The hexagon is more bothering me. It is not a very precise assembly and you can have problems when you brake hard...
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Old 02-03-2020, 02:41 PM
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Originally Posted by Airwave View Post
Mechanically valid solution, as you are not changing pulleys very often... The hexagon is more bothering me. It is not a very precise assembly and you can have problems when you brake hard...
The Xpress XQ1 mid pulley is a more robust arrangement than this one.
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Old 02-03-2020, 02:57 PM
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Originally Posted by Carnage9270 View Post
That lock ring...needs to go....those things are horrible.
We had an absolute rule where I worked for 38 years, no lock/snap rings on a rotating part.
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Old 02-13-2020, 04:07 PM
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What happened??? No info or update on this car
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Old 02-13-2020, 04:34 PM
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Yeah, I have until next weekend to get a car ordered
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Old 02-18-2020, 03:43 AM
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Can we change the snap ring to e-clip?
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Old 02-18-2020, 10:02 AM
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Originally Posted by tbrymer View Post
Yeah, I have until next weekend to get a car ordered
I see a BD10 in your near future!
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Old 02-18-2020, 11:01 AM
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Originally Posted by glennhl View Post
I see a BD10 in your near future!
LOL. Trying not to, but you could be right.
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Old 02-20-2020, 04:10 PM
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The E-Rings are simple and easy to install, so I can see why some people aren't too thrilled going to the snap ring. Personally, I've only had 1 E-Ring fail me over the years, but was from my own ignorance compromising the integrity. Honestly the only advantage to the E-Ring, they are easier to remove and install during maintenance.

The snap ring will certainly hold more load over the E-Ring, in theory as the E-Ring holds less contact area. Snap ring will be stronger in thrust, also have a lower profile. When installing the snap ring, you just need to be more careful it's not damaged by opening too much during installation, or removal.

Nothing wrong changing to the snap ring guys, this will only improve the strength of the center transmission.
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Old 02-20-2020, 04:34 PM
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Originally Posted by Airwave View Post
Mechanically valid solution, as you are not changing pulleys very often... The hexagon is more bothering me. It is not a very precise assembly and you can have problems when you brake hard...
Hex shafts are typically used in industrial power transmission applications, especially in heavy machinery. This will hold up just fine with the new application and will have very little compromise, if any under accelerating and braking. If your braking that hard, the belts would skip, or round a spur gear before there was any compromise on the hex style layshaft pulley.
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Old 02-20-2020, 04:45 PM
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ARC is working very hard to get the new car released. There is lot of time being invested into the new car and lot of testing, the delay of the new car isn't something ARC was wanting to happen for obvious reasons. ARC is looking to provide a more dominant platform over the current platform for all racing surfaces, this is taking a little longer than expected and certainly isn't easy. Everyone's patience is very much appreciated.
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