Author Topic: Another question about fuel shutoff rule  (Read 490 times)

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Online donpearsall

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Another question about fuel shutoff rule
« on: June 25, 2019, 02:03:06 PM »
I sent an email about this to 'tech@bonnevillespeedtrials.com' but have not gotten a response yet.

Just checking - Has anyone passed tech inspection regarding this requirement by having a vacuum operated petcock? With this type of petcock, gas will not flow if the engine is not running. It is handlebar operated by virtue that the engine kill button is on the handlebars. Press the stop button, the engine stops, and the fuel flow stops. It is just the same as a fuel pumped engine - press the stop button and power to the pump is gone.

Any input on this?

Thanks
Don
550 hp 2003 Suzuki Hayabusa Land Speed Racer

Offline Pippi2

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Re: Another question about fuel shutoff rule
« Reply #1 on: June 25, 2019, 07:50:41 PM »
(Forwarded to our technical inspection team for official response)

Online donpearsall

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Re: Another question about fuel shutoff rule
« Reply #2 on: June 25, 2019, 09:05:06 PM »
Thanks much Linnea!
Don
550 hp 2003 Suzuki Hayabusa Land Speed Racer

Offline yamagamma

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Re: Another question about fuel shutoff rule
« Reply #3 on: June 26, 2019, 12:05:31 PM »
From my experience that's only allowed in production classes.
Old enough to know better!

Offline Stainless1

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Re: Another question about fuel shutoff rule
« Reply #4 on: June 26, 2019, 07:48:40 PM »
It seems the one I had with a vacuum petcock had a reserve position that did not require vacuum. 
But that was a long time ago... Tech  will get back to  you
 :cheers:
Stainless
Red Hat 228.039, 2001, 65ci, MSA Bockscar Lakester with a little N20 
MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.

Online donpearsall

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Re: Another question about fuel shutoff rule
« Reply #5 on: July 14, 2019, 10:32:55 PM »
I did get a response from Drew Gatewood, Chief AMA Steward for BMST. He said that the vacuum petcocks are not acceptable for this rule.

As was already discussed here, the acceptable petcock shut-offs are the handlebar mounted cable system like Pingel sells, or the electric solenoid shutoffs. So since I don't want to mess with a custom order like the Pingel requires, I am going for the solenoid.

Just thought this rule interpretation might be asked again so a search here will find it.

Don
550 hp 2003 Suzuki Hayabusa Land Speed Racer

Offline yamagamma

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Re: Another question about fuel shutoff rule
« Reply #6 on: Today at 12:18:13 PM »
Watch out for the fuel flow through some of those solenoids, some are sold as 1/4 inch but the actual hole inside when the valve is open is more like 1/8 inch. I try to stay away from electrical on the salt. A cable operated fuel valve is bulletproof. I just drill a 1/16th hole in the pingel lever and attach a deralleur gear cable off a bicycle. Magura make a nice handlebar lever that gives plenty of travel. Rig up a bracket for the cable and you are done.
https://www.amazon.com/Magura-14AL7-Choke-Assembly-0550845/dp/B00230I156


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Offline maj

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Re: Another question about fuel shutoff rule
« Reply #7 on: Today at 04:13:26 PM »
We recently put mechanical fuel pumps on the Aussie bikes , for high flow on methanol,
big capacity bypass valves needed there ,  used bicycle brake levers and cable setup to control it
Bicycle shop guy was great , spent a bit of time finding levers that were not too obtrusive to mount , and gave us lots of spares to create or repair cables any time
Then we shortened the lever and set up for one finger control  like a hot start lever on a dirt bike