Almost a nightmare. Wierd part to actaully break?
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From: Gie
Originally Posted by S2Kart,Dec 13 2007, 10:35 AM
The stock throttle shaft is a nice steel piece with a slot through the center - awesome Honda engineering.
If BDL uses an aluminum shaft -
At 15 psi of boost the throttle shaft sees 28.5 pounds of force during a shift (the butterfly closes but you still have boost against the butterfly/throttle shaft).
28 pounds shouldn't break an aluminum shaft, but it may be enough to repeated flex it and create a fracture.
A BOV helps, but of course a steel shaft TB would be the way to go.
If BDL uses an aluminum shaft -
At 15 psi of boost the throttle shaft sees 28.5 pounds of force during a shift (the butterfly closes but you still have boost against the butterfly/throttle shaft).
28 pounds shouldn't break an aluminum shaft, but it may be enough to repeated flex it and create a fracture.
A BOV helps, but of course a steel shaft TB would be the way to go.
Now this only occurs during rapid throttle body closure at full boost, but repeat it many times and you can stress the crap out of something. I can't imagine why they would manufacture such a critical piece from aluminum.
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From: New Jersey
Originally Posted by SpoolinS2K603,Dec 14 2007, 12:45 AM
Thank you guys for the help and advice. I have to go search for a replacement.....
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From: PDX west
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Probably cracked right accross where a butterfly screw hole goes through the shaft.
Brass for the shaft makes sense, hard to imagine they would use aluminum.
Originally Posted by slimjim8201,Dec 13 2007, 05:46 PM
28.5 pounds of pressure. Multiply the pressure by the cross sectional area of the throttle plate to get the total normal force on the part. Most likely in the 50-60 pounds of force range.
Now this only occurs during rapid throttle body closure at full boost, but repeat it many times and you can stress the crap out of something. I can't imagine why they would manufacture such a critical piece from aluminum.
Now this only occurs during rapid throttle body closure at full boost, but repeat it many times and you can stress the crap out of something. I can't imagine why they would manufacture such a critical piece from aluminum.
Probably cracked right accross where a butterfly screw hole goes through the shaft.
Brass for the shaft makes sense, hard to imagine they would use aluminum.
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