Brief update on FJ spec motor proposal

Joe Ricard · Posted: Mon Jan 23, 2012 10:51 am Post subject:

I don't think any of the FJ trophy winners were Autocross only.

I never realized the huge improvement a kid will get with a few lapping days at a sprint track. Since getting my youngin out to the sprint track he got considerably faster in the cone dodging gig.

Now have a WF with new slide restrictor, Stock Raptor on Gas, and new to the stable is a Mini Max. Can you guess which one he likes the best????
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Brian Garfield · Posted: Mon Jan 23, 2012 11:54 am Post subject:

Joe Ricard · Posted: Mon Jan 23, 2012 12:19 pm Post subject:

Shawn P. Hill · Joined: 02 Oct 2009 Posts: 120

I don't fully understand the want or need to move to a spec motor. I'm doing a bunch of research on it and trying to be as open minded about it as possible but just cant seem to justify having 1 motor option that isn't prevalent in other forms of kart racing that could be done with the same chassis.

My oldest is 5 and he can't wait for the weather to warm up so he can go to the track in his new toy. I have plans for us to both sprint race if he's up for it and both autocross is he's up for it. I don't want to have 2 karts in the stable that depend on where we are racing as to which one to use.

I do like the idea of an "easy" solution for the non karting dads that want little Jimmy to come play as well. That. sounds. great! But why exclude the others that also want to play on the sprint track too? I'd like to see us bring the top 3 or so motors together and come up with a fair way (preferably not so much weight but with throttle restrictors) to make them all competitive? I'm all for developing the WF to be as competitive as the KT100 or MiniMax. But the more I think about it and fester on it, I don't like the idea of only 1 motor option.
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Brian Garfield · Posted: Mon Jan 23, 2012 1:03 pm Post subject:

Just to be clear, in JA, the BWF is competitive with both the KT100 and Mini Max...

The slide restrictor in JB will make the BWF competitive (or more)...

Brian

Joe Ricard · Posted: Mon Jan 23, 2012 1:21 pm Post subject:

Fortunately for you Shawn, 5 yr olds do have a spec motor that is pretty much standard everywhere. Comer 50cc on a kid kart.

Well except my local track which has chosen the LO206 in kid RPM lmited and throttle slide. Junior 1 throttle slide, stock rev limit 225 lbs , junior 2 wide open throttle and stock rev limit @ 300 lbs.

all of which are significantly less power than the JA WF. and maybe close to a JB WF.

This is worse than picking the right house to buy based on school district. to include should we go to privte school. Rolling Eyes

same thing.
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Ryan Miles · Joined: 12 Apr 2011 Posts: 17

Richard Jung · Joined: 14 Aug 2009 Posts: 25

Joe Ricard · Posted: Wed Jan 25, 2012 11:41 am Post subject:

Between crappy weather and such I have not been able to test them head to head. Still trying to get it done this weekend.

Yes it's stock, not blueprinted, probably 8 ish to 9 HP I think. I have both karts rigged up for adults running the JB motor configuration. we can swap drivers back and forth to get a good feel for the "better" package.

You know I don't see much of a difference between the gas and Methanol powered Raptors at this level of prep. so obviously these are fairly stock. Now the one I blew up a few months back was a big deal as it had tons of compression a JE piston and longer rod. and a staggered flywheel timing key. Things you can't really see till you actually pull it apart.

Yea here we go what does a stock Raptor really look like. Rolling Eyes

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Richard Jung · Joined: 14 Aug 2009 Posts: 25

Joe Ricard · Posted: Wed Jan 25, 2012 1:22 pm Post subject:

For comparison purposes our local sprint track runs the LO206 package in restricted and unrestricted forms. The Flat head raptor of my son's can flat walk away from them. So what ever the LO206 motor is spec'ed at we make more.
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Joe Ricard · Posted: Sun Jan 29, 2012 6:07 am Post subject:

Well I attempted to race the Raptor heads up against the Throttle slide restricted WF. You would think this would be easy. But keeping two karts running without bringing any of my spares is doomed before we began

Any Luckily the Raptor was the one giving me fits with fouled spark plug.
The WF fired right up and after a quick warm up we were off. I ran the same course as the cars had run all day they scored a 22.9 run after a couple runs I posted FTD of 21.3

I got nowhere near the rev limiter and it seemed to take forever to get enough RPM high enough for the clutch to lock up. (100+ feet)

Once up to speed I never lifted till reaching the finish. (scared to as it would take forever to get back to speed). So this was JB power on a full size 30MM Corsa chassis with me in it @ 160 pounds so a little over the 255 min. I put another new adult karter in the kart and he was 145 pounds and only managed a 21.9

So which one is faster is still up in the air but I have my suspicions as I am pretty familiar with Raptor power.
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Richard Jung · Joined: 14 Aug 2009 Posts: 25

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Joe Ricard · Posted: Mon Jan 30, 2012 6:14 am Post subject:

I do not think the JB WF is faster as it does not seem to have any top end. Not speficially familiar with JB KT-100 as I have only seen one running against a Raptor and we know how that came out.

Got home put a new plug in the Raptor and problem solved. But don't want to drag race them in my nieghorhood.
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