Voith

My tensioner fell apart and bend the valves. Belt came off as good as new. no damage at all.

elargentino

OT - I never liked the auto tensioner.
I have smashed them on the floor in front of 944 owners before, and I give them an early one - (a few Rennlisters, in fact).
Just don't like them, my opinion.

CPR

Ferrari's?

They don't have to worry about belts as their maintenance schedule is a complete engine overhaul every 15,000 miles....

elargentino

This is not only funny, but it is a good point.
Ferrari owneres are not 18 year old kids who neglect maintenance standards and drag down the average - as many 951 owners are (don't shoot the messenger)
Even a guy with a 308 will probably be a 30 something year old proffessional who is a very scared trader, when it comes to that engine.

Voith

This is myth.

30.000 mile service quotes: Timing belt inspected or replaced at 3-5 years.

Voith

Many owners in US.

In europe 951 is no ferrari, but I've never seen 18 year old 951 owner. (or 944 for that mater)

I am 100 miles away from germany and 951s are very rare here. Even 944s are rare.

Naplesguy06

Too bad NASA hasnt advanced in 30 years,we just retired our only manned orbiter and out aircraft are no longer supersonic in commercial flight,I think the contrapositive applies here,unless you can prove that materials have actually advanced in the last 30 years and new atomic particles have ben discovered and applied to timing belts for tensile strength and elasticity then its a moot point.Just because kevlar stops a bullet in compression does not mean it is better in tension,usually the opposites apply here. Being that I am a P.E and work with labarotory ASTM testing regularly for 30 years plus I have never seen data that proved kevlar is superior in timing belts. Porsche, however, did test thier belts and they still do because they have to back the warranties up to 5 years and 50k miles,some cases longer if they thought for a second that the tried and trued belt would fail they would develop a replacement for it,,they are the factory.

elargentino

Of course I understand this, but you prove my point.
I am talking about law of averages here.

JDS968

Carbon fiber may be unfeasible for Boxsters, Caymans, Cayennes, Panameras, even most 911s...but aluminum isn't. I've been wondering lately why they don't use it extensively. Porsche has done an admirable job of keeping the weight down, RWD 911s are still in the 3000-ish pound range...but they could be a lot lighter using aluminum unibody structures and body panels. Audi's been using aluminum structures in mass-produced cars for years, why is Porsche lagging behind on this??

Naplesguy06

now were going to get into standard deviations right?

Voith

Aluminum chasy is not as rigid as steel since aluminum is soft. Good material for junk like audi, but not good enough for porsche obviously.

I wonder why they dont produce cars like this anymore:



It is after all 20 years old car that is almost as fast as fastest car on planet 20 years later.

elargentino

With simple thickness and engineering, obviously the Audi sub-frames can be the same, or better (if budget allows).
But I don't understand the relevance of the Porsche in your post....you are a very cryptic guy.

teamcrossworks

The object of this post was to gather information and opinions so that I and others interested could decide if Kevlar was worth the extra money when it came time to change our timing belts.

I have made my decision (stated it) and because of this thread I feel others can too .

IMHO we are now beating a dead horse to death and then some.

teamcrossworks

What do you guys think?

F18Rep

Now THAT was funny.

Here's a link to the 928 (read mucho aluminum) board where this was discussed about a month ago. Less drama and less entertaining maybe, but still informative. Some of the guys that contributed to that thread are big time gurus. They challenge a lot of things before accepting them and I think if you give them some time, you might respect what they have to say. Or not...Bruce

PS...Kempf is a twist method tensioning tool.

https://rennlist.com/forums/928-forum/594383-kempf-setting-new-gates-belt-on-s4.html?highlight=gates"]Link