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Just guessing, maybe it's the much biggger and aggressive cams which pushes the stock belt over the edge.
Hi Swaybar,
It was sorta tongue cheek, hence the smiley face. It could just be the fact it is a Conti belt, I would guess with all of Carl's vast experience and racer's mentality of continually improving, he knows what the issue is/was and is addressing it more than any of us could help.
In reality, it seems like an odd "hijack" to an interior paint thread, but that is the wonder of Rennlist!! LOL
It was sorta tongue cheek, hence the smiley face. It could just be the fact it is a Conti belt, I would guess with all of Carl's vast experience and racer's mentality of continually improving, he knows what the issue is/was and is addressing it more than any of us could help.
In reality, it seems like an odd "hijack" to an interior paint thread, but that is the wonder of Rennlist!! LOL
Cheers to you,
Dave
LOL, the car does look great and he's had a few weeks to figure out the issue, it's something all of us could learn from. There are theories abound but only he could tell us something we could learn from. I agree that it could just be because it's a Conti. I would think he'd want to use the Gates Racing belt on that high power engine.
Did you ever figure out why the Conti belt snapped on your last outing?
The Gates engineers that I spoke with helped me assess the mode of failure based upon the break. The break in the belt was straight across, between the teeth. They told me this is usually caused by the belt being folded (like it says to never do on the package) which causes the fiber reinforcement within the belt to break. Another way that the belt reinforcement can be broken is by putting up a large harmonic wave, they said. The belt broke just after I went from rapid accel to rapid decel, and that would certainly have put up a harmonic wave in the belt. No doubt.
There are two suggestions and I am looking at both of them: 1) is using a stronger belt, and 2) is adding an idler in the large span between the water pump and the left head to prevent the harmonic wave from being so great. An examination of the valve train shows that the span from the water pump to the right cam is actually the longest, and it has a anti-harmonic idler already mounted on the toothed side. The second-longest span is from water pump to left cam, and it has no such protection. They encouraged me to install an idler on the smooth side within that span. We believe this is where the harmonic wave when I switched from accel to decel became the greatest, and the Gates engineers told me that wave will break belt fibers as neatly as folding a belt will.
Conversely, when a timing belt is torn apart by too much tension, it tears in an oblique line that usually involves 8 or 10 teeth, they said. So no, we do not think this was caused by running high-lift cams or high valve spring rates.
LOL, the car does look great and he's had a few weeks to figure out the issue, it's something all of us could learn from. There are theories abound but only he could tell us something we could learn from.
Hi Sean,
If there is anything to share I am sure Carl will share when he feels the time is right. In over 2 decades I have never seen Carl be shy about sharing his info. He has shared all the good and the bad for others to use for their 928s. In reality he is pushing the limits with 928 Performance Developments, you know Racing Improves the Breed thingy. What he does is a far cry from just replacing a damaged or worn part and has probably advanced 928 enhancement as much as anyone, and much more that most
Originally Posted by SeanR
I agree that it could just be because it's a Conti. I would think he'd want to use the Gates Racing belt on that high power engine.
Ok, now we are starting to sound like a Gates Racing Belt commercial, which is where this was heading anyway, nothing new to learn just the same ole thing well documented, "Contis" are bad, Gates are best". LOL!!
Bad to the white paint topic, Carl what kind of paint did he use, expoxy?
Dave, just Hardware Store Rustoleum Oil based paint and a paint brush. Easy to touch-up later and still have it match. The paint that "failed" was automotive spray paint, done at the time when the car was painted in 2010.
If there is anything to share I am sure Carl will share when he feels the time is right. In over 2 decades I have never seen Carl be shy about sharing his info. He has shared all the good and the bad for others to use for their 928s. In reality he is pushing the limits with 928 Performance Developments, you know Racing Improves the Breed thingy. What he does is a far cry from just replacing a damaged or worn part and has probably advanced 928 enhancement as much as anyone, and much more that most
Dave, just Hardware Store Rustoleum Oil based paint and a paint brush. Easy to touch-up later and still have it match. The paint that "failed" was automotive spray paint, done at the time when the car was painted in 2010.
Hi Carl, Thanks for that tip!
Originally Posted by Carl Fausett
Hey Dave, you made my day! Week even!
Well, as you are fully aware, Sometimes the Truth Hurts....and Sometimes it FEELS GOOD!!!
08-01-2018, 05:22 PM
The GWS gets a fresh interior
