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Riley Will
Joined: 03 Sep 2001
Posts: 1361
Location: Canada, not USA state,
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Riley Will
Joined: 03 Sep 2001
Posts: 1361
Location: Canada, not USA state,
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 Posted: Wed Sep 19, 2012 6:38 pm Post subject: |
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Ran our twin again today. We focused on chassis balance and tires. We tested 6" Superkart tires and 5" sticky tires. So much fun working chassis, the engines continue to impress and run like a top!
Very successful as we decided on the tire for the package and went out and lowered the outright track record that has stood for years. It was done by a 125cc shifter. We lowered it by 0.5 seconds. Even more impressive us that it was done on a green track and not at a major event with rubber down!
I think with more tuning we could go even faster:)
I will be posting up more video of today shortly.
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Riley Will
BRC Engineering
rwill@brceng.com
(403) 216-0630 wk.
www.brceng.com |
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Walt Gifford
Joined: 19 Jul 2002
Posts: 4304
Location: United States, South Jerrrsey,
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| Posted: Tue Sep 25, 2012 8:59 am Post subject: |
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Looking at the video seems like it comes off the turns a little soft. I know it has those low lock up clutches but are the carbs real big or the pipe a little peaky or were you going easy to avoid wheel spin? Seems like it comes on the power 1/3 down the straight. Doesn't sound like a twin on the video must be tuned pretty good together.
Gif 
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FAA certified jet engine and aircraft technician
Nicholson Speedway class champion 2001
Yamaha KT100 Service Center
40 years karting experience |
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Pete Muller
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Joined: 23 Jul 2001
Posts: 1950
Location: United States, California,
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| Posted: Sat Sep 29, 2012 10:19 am Post subject: |
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I think "soft" is probably deceiving in this case. 
That looks like a LOT of fun Riley!
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Chris Hurst
Joined: 27 Jul 2007
Posts: 570
Location: United States, California,
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| Posted: Sat Sep 29, 2012 3:30 pm Post subject: |
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| Riley Will wrote: | Ran our twin again today. We focused on chassis balance and tires. We tested 6" Superkart tires and 5" sticky tires. So much fun working chassis, the engines continue to impress and run like a top!
Very successful as we decided on the tire for the package and went out and lowered the outright track record that has stood for years. It was done by a 125cc shifter. We lowered it by 0.5 seconds. Even more impressive us that it was done on a green track and not at a major event with rubber down!
I think with more tuning we could go even faster:)
I will be posting up more video of today shortly. |
Hey Riley, been following the build since the thread was started. Pretty neat idea and good going breaking the track record. Curious if you guys have any dyno graphs or can describe the power band with some #s compared to the shifter that had the track record before you.
Also was the previous record for the shifter laid down in a race where the track had grip?
Just trying to understand how much more power you are working with. Any plans on road racing it? |
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Riley Will
Joined: 03 Sep 2001
Posts: 1361
Location: Canada, not USA state,
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| Posted: Thu Oct 04, 2012 5:45 pm Post subject: |
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Walt,
The bottom power off of the hairpin is soft compared to a shifter, but it takes about 20' off of that turn for it to plaster you like I've never felt before. I think it sounds the way it does (like a single) because the clutches are lock up types and not a typical high stall slider clutch type. It is deceiving on the video, John's driving makes it look easy. When the power valves open its like nitrous!
Pete,
It is awesome fun to drive. The part I have enjoyed is the building/engineering of it. Nobody does this stuff anymore and it's a shame:(. It does work really well and is very balanced.
Chris,
We are working with about 90-92hp. I haven't dynoed it together as we have an engine dyno now and sold the DynoJet dyno. We are using only 24mm ica carbs on it. 30mm KF1 carbs hit too hard!!! Our lap time was set on a green track. The previous was done by a 125cc kart under a 3 day event and great conditions.
It still revs past 15,800rpm and I want to lengthen the pipes again to gain more acceleration off of the slow turns and maybe limit the revs. The chassis and the engines are really tuneable. I think we still have another second left in it too.
Here are some video links from our last session:
http://m.youtube.com/watch?feature=plpp&v=BDyHIWp51Dw
http://m.youtube.com/watch?feature=plpp&v=bAIhn97FnO8
Hope you guys have enjoyed this as much as me.... Got another few projects being finished now, but the weather is getting cold up here.... Spring will be fun;)
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Riley Will
BRC Engineering
rwill@brceng.com
(403) 216-0630 wk.
www.brceng.com |
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Jim McMahon
Joined: 07 Apr 2007
Posts: 2688
Location: United States, St. Paul,
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| Posted: Thu Oct 04, 2012 7:33 pm Post subject: |
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Hey Riley if you can find some KZ or other onboard footage from the same track I can put a side-by-side video together for you..
For sure looks like the thing is just getting warmed up.
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Live in the midwest and have a TaG, Shifter, KPV, KT100, Animal\LO206, enduro or superkart?
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Last edited by Jim McMahon on Thu Oct 04, 2012 7:37 pm, edited 1 time in total |
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Riley Will
Joined: 03 Sep 2001
Posts: 1361
Location: Canada, not USA state,
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| Posted: Thu Oct 04, 2012 7:36 pm Post subject: |
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James,
That was a KZ kart that John blew by.... It's a non contest;)
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Riley Will
BRC Engineering
rwill@brceng.com
(403) 216-0630 wk.
www.brceng.com |
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Jim McMahon
Joined: 07 Apr 2007
Posts: 2688
Location: United States, St. Paul,
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| Posted: Thu Oct 04, 2012 7:41 pm Post subject: |
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| Riley Will wrote: | James,
That was a KZ kart that John blew by.... It's a non contest;) |
I get that, but some others don't. Was that a novice driver in the KZ?
_________________
Live in the midwest and have a TaG, Shifter, KPV, KT100, Animal\LO206, enduro or superkart?
Click here to join the karting festival at Blackhawk, IL June 1st-2nd. |
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Riley Will
Joined: 03 Sep 2001
Posts: 1361
Location: Canada, not USA state,
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| Posted: Thu Oct 04, 2012 8:10 pm Post subject: |
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Nope.... He goes own the straight as good as anyone that can pull gears.... The 300 is just that quick!
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Riley Will
BRC Engineering
rwill@brceng.com
(403) 216-0630 wk.
www.brceng.com |
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Jim McMahon
Joined: 07 Apr 2007
Posts: 2688
Location: United States, St. Paul,
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| Posted: Thu Oct 04, 2012 8:25 pm Post subject: |
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I was going by his body language but yeah the 300's got a little poke alright. How about a laydown version for the long tracks
_________________
Live in the midwest and have a TaG, Shifter, KPV, KT100, Animal\LO206, enduro or superkart?
Click here to join the karting festival at Blackhawk, IL June 1st-2nd. |
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Chris Hurst
Joined: 27 Jul 2007
Posts: 570
Location: United States, California,
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| Posted: Thu Oct 04, 2012 10:08 pm Post subject: |
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| Riley Will wrote: | Walt,
The bottom power off of the hairpin is soft compared to a shifter, but it takes about 20' off of that turn for it to plaster you like I've never felt before. I think it sounds the way it does (like a single) because the clutches are lock up types and not a typical high stall slider clutch type. It is deceiving on the video, John's driving makes it look easy. When the power valves open its like nitrous!
Pete,
It is awesome fun to drive. The part I have enjoyed is the building/engineering of it. Nobody does this stuff anymore and it's a shame:(. It does work really well and is very balanced.
Chris,
We are working with about 90-92hp. I haven't dynoed it together as we have an engine dyno now and sold the DynoJet dyno. We are using only 24mm ica carbs on it. 30mm KF1 carbs hit too hard!!! Our lap time was set on a green track. The previous was done by a 125cc kart under a 3 day event and great conditions.
It still revs past 15,800rpm and I want to lengthen the pipes again to gain more acceleration off of the slow turns and maybe limit the revs. The chassis and the engines are really tuneable. I think we still have another second left in it too.
Here are some video links from our last session:
http://m.youtube.com/watch?feature=plpp&v=BDyHIWp51Dw
http://m.youtube.com/watch?feature=plpp&v=bAIhn97FnO8
Hope you guys have enjoyed this as much as me.... Got another few projects being finished now, but the weather is getting cold up here.... Spring will be fun;) |
Thanks for the info! Will you take it to any road courses? You should definitely go out to a big track and let this thing stretch a bit. Cool build. |
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Riley Will
Joined: 03 Sep 2001
Posts: 1361
Location: Canada, not USA state,
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| Posted: Thu Oct 04, 2012 11:28 pm Post subject: |
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How about a Superkart version that drives a separate behind the driver transmission????? 
Stay tuned....
_________________
Riley Will
BRC Engineering
rwill@brceng.com
(403) 216-0630 wk.
www.brceng.com |
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Tim Salvino
Joined: 20 Nov 2010
Posts: 258
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| Posted: Fri Oct 05, 2012 7:11 am Post subject: |
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| Riley Will wrote: | How about a Superkart version that drives a separate behind the driver transmission?????
Stay tuned.... |
No way.
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Jim McMahon
Joined: 07 Apr 2007
Posts: 2688
Location: United States, St. Paul,
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