TB PorKensioner
12-03-2006, 05:58 PM
#108
Inventor
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I'm finally getting around to putting in a ground wire to stop the BELT TEN. o<O light, today. I've driven a couple thousand miles, mostly city, with a couple hundred mile freeway trips. Since I fixed the kickdown, I've been flogging the old gal whenever I can.
You can see the darker area where the belt tracks on the pulley. This should be dependent on the pulley spacing, not the angle of the pulley!
Interesting how the belt moves at high rpms. I was doing some high rpm revs, and watching how the belt tracks. The belt comes out of the water pump pulley almost flat at high rpm (roughly 1/2" >4K); the flat length growing with rpm. This is why the stock system has the idler pulley, I reckon.
...
I've done zero research on production. I've just been enjoying the drive! The plan (OK, the notion) is to ramp up the cam tools, from which I'll be able to pay for the next 'round of production costs on the PorKensioner.
I figure that it will take a few years for this to be widely accepted, so I'm in no hurry.
You can see the darker area where the belt tracks on the pulley. This should be dependent on the pulley spacing, not the angle of the pulley!
Interesting how the belt moves at high rpms. I was doing some high rpm revs, and watching how the belt tracks. The belt comes out of the water pump pulley almost flat at high rpm (roughly 1/2" >4K); the flat length growing with rpm. This is why the stock system has the idler pulley, I reckon.
...
I've done zero research on production. I've just been enjoying the drive! The plan (OK, the notion) is to ramp up the cam tools, from which I'll be able to pay for the next 'round of production costs on the PorKensioner.
I figure that it will take a few years for this to be widely accepted, so I'm in no hurry.
12-03-2006, 10:56 PM
#109
Three Wheelin'
Originally Posted by PorKen
I figure that it will take a few years for this to be widely accepted, so I'm in no hurry.
I belive the correct emoticon is
I'm sure Heinrich is already forming a lynch mob. 
12-04-2006, 03:36 AM
#110
Rennlist Member
Ken not sure what you mean by "comes out of the water pump pulley almost flat" -- do you mean that after it turns the corner and heads for the DS cam sprocket, it moves horizontally, like toward the PS pump for 1/2" or so? A pic of that would be neat, but I don't see how an idler would help. Did you see this happen with the original setup, or did you check it that closely in the first place?
12-04-2006, 02:19 PM
#112
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I thought Heinrich left to spend his golden years in FL?
Here's what odd, and what I didn't describe properly - the flat was on the right (US passenger) side. The belt was flattening before going into the water pump pulley. I didn't look at the left side and I had never looked for this before. I was watching the tensioner, and noticed this in passing.
I'll for sure have a few brackets made for the hardcore. But, realistically, people are not going to be lining up to spend $300 on a experimental device if their current tensioner works.
Here's what odd, and what I didn't describe properly - the flat was on the right (US passenger) side. The belt was flattening before going into the water pump pulley. I didn't look at the left side and I had never looked for this before. I was watching the tensioner, and noticed this in passing.
I'll for sure have a few brackets made for the hardcore. But, realistically, people are not going to be lining up to spend $300 on a experimental device if their current tensioner works.
12-04-2006, 03:03 PM
#115
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Do 928s need lips?
All I know is that I've seen the PorKtensioner in action, listened to the engine while the new addition was quietly running, floorboarded the car on the road, etc...and it's a design concept that Porsche should have implemented in their GTs and GTSs (they did it on the 968 after all in '92), it appears to be well engineering and crafted, is of good quality, and after it proves itself during the alpha/beta testing, I'm thinking it will be the cat's meow for 928s.
Being ultra paranoid, I just wish the 928 had protective lips of some kind on it's various rollers/cam gears to keep the belt in place in the event it tries to creep off a pulley. The 968 has some of this but not enough to suit me. There must be an engineering (or cost?) reason why they didn't do this? Perhaps at the time they didn't perceive it to be a problem. I guess some still may not feel that it's an issue but as the cars get older it may become more of an concern. I think there probably have been enough granaded 928 engines to make it an issue. Had the 928 continued in production beyond '95 I'm positive they would have gone this route. Makes one think that as early as '92/'93 they may have been preparing to pull the plug on the 928.
Harvey
Being ultra paranoid, I just wish the 928 had protective lips of some kind on it's various rollers/cam gears to keep the belt in place in the event it tries to creep off a pulley. The 968 has some of this but not enough to suit me. There must be an engineering (or cost?) reason why they didn't do this? Perhaps at the time they didn't perceive it to be a problem. I guess some still may not feel that it's an issue but as the cars get older it may become more of an concern. I think there probably have been enough granaded 928 engines to make it an issue. Had the 928 continued in production beyond '95 I'm positive they would have gone this route. Makes one think that as early as '92/'93 they may have been preparing to pull the plug on the 928.
Harvey
