Thread: Sonic Booms-APBA-IJSBA Legal Now
04-15-2008, 11:45 PM #1
Sonic Booms-APBA-IJSBA Legal Now
I need to thank Tim for starting the APBA sanctioned Hydrodrags and giving me the kick necessary to discover this.
Anybody who wants to convert their Sonic Boom throttle bodies to make them legal in both IJSBA and APBA need only add 3 K&N part numbers 59-2046
This is a RACING ONLY flame arrestor, and does not have the cotton media sandwiched between the layers of epoxy coated screen, which will give it much greater airflow than a standard flame arrestor.
The fit is perfect. As the pictures show the flame arrestors are ribbed on the inside clamping area. This grips the edge of the velocity stack when tightening the clamp and creates a super tight mount, that once clamped is, going nowhere.
The ID of the arrestor neck and the OD of the velocity stack bellsmouths are both 2.750 inches.
When mounted on the ski the clearance between the flame arrestors and the hull of the ski is only 1/4-3/8 of an inch.
They can be installed by simply removing the battery box, if you have a long arm to reach with.
It may be best to remove the pipe to gain easier access and make sure the clamp is centered on the arrestor when tightening.
Any K&N dealer can order these for those that already have my setup, and want to add a flame arrestor, or i can order them for you.
These will work on my standard 40mm setup or my bored 43mm setup just the same.
I just finished a 43mm set that is ready to go now for anyone who is interested, and of course i have a 40mm set ready to fly also.
Last edited by rossnemo; 04-16-2008 at 12:11 AM.
04-16-2008, 05:17 AM #2
I have to say go the 43s they work GREAT nice work Ross.
04-17-2008, 10:24 PM #3
Here are some pics of my prototypes for a different, and technically a more durable mounting system for the flame arrestors.
The aluminum rings are heli arced onto the velocity stacks and give a full grip on the mounting surface of the flame arrestor.
These of course cost more to fabricate, but will be more durable for the long term. This would be the preferred mount for any ijsba or open ocean riders that give their hulls more hits from the waves than the drag racers do.
04-17-2008, 11:13 PM #4
whats the cost of the flame arresters itself ross??
04-17-2008, 11:26 PM #5
04-18-2008, 03:48 PM #6
Chris is correct, around 45 each.. Both 43mm and 40mm modified sets will be legal for LIMITED, and UNLIMITED as per current APBA rules..
04-24-2008, 12:19 AM #7
have you done back to back testing to see if the filters have an adverse affect on the SB's?
04-24-2008, 07:49 AM #8
04-24-2008, 06:25 PM #9
sweet... looking forward to your findings
04-26-2008, 07:12 AM #10
Here are pics of them installed on my Lowell 1390 motor.. Going to do some back to back testing today with the flame arrestors on and then off..
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