Timing belt replacement intervals.

onthehunt · **Posted:** Sat Jul 25, 2009 9:50 am

Quote:

So in theory YOUR causing more damage running ULSD than I am running a prperly designed WVO system

So in theory, your theory is incorrect?

kdlewis1975 · **Posted:** Sat Jul 25, 2009 10:30 am

nursecosmo wrote:

kdlewis1975 wrote:

...titanium will probably have less flex. It is also very susceptible to hydrogen embrittlement, though this may less problem for a car than for a jet...the main reason aircraft structures are generally aluminum instead of titanium.

Umm...no. The main reason that the whole airframe and skin of most aircraft aren't made of titanium is weight and coshttp://www.titanium.com/titanium/aerospac.cfmt. Niether aircraft nor automobiles see a lot of H2 during their lifetimes, unless they are fuel cell powered.

Ummm...maybe there's more to it...I wasn't able to read your link. As you pointed out, the biggest reason is probably cost due to it being so strong and difficult work in traditional manner. It's easier to make complex structures from aluminum than titanium.

"The two most useful properties of the metal form are corrosion resistance and the highest strength-to-weight ratio of any metal." and "Titanium is 60% more dense than aluminium, but more than twice as strong as the most commonly used 6061-T6 aluminium alloy." from http://en.wikipedia.org/wiki/Titanium . So, in theory, if one wants a structure of X strength, a titanium part should weigh 20% less than the equivalent aluminum part for the same strength value.

If you have water + corrosion of metals going on, then you have a source of hydrogen. The oxidation of iron to rust liberates hydrogen due to the reduction of water. Lead acid batteries can be a source as well for similar reasons. "High-strength and low-alloy steels, nickel and titanium alloys are most susceptible" from http://en.wikipedia.org/wiki/Hydrogen_embrittlement. How much of that would a car see over it's lifetime...hard to say. I was just suggestingit as a potential issue.

Now in the case of vegiH's application, the embrittlement issue may not a big issue, but it may be a reason to go with aluminum. The choice may ultimately come down to which material has the better fatigue properties and cost.

vegiH · **Posted:** Sat Jul 25, 2009 2:12 pm

The two trannys is for gearing,I want to get 100mpg @ 100mph.The tranny in the 924 is VW bug type(rearmounted),which a low geared tractor transaxle,I should be able to get somewhere near 200:1 gear ratio coupled thru the two trannies(think 5+2 spicer TT trans.)Without spinning above 1500RPM,longevity in the engine and top speed without sacrifing torque

.I will keep you poste as this progresses...................H

nursecosmo · **Posted:** Sat Jul 25, 2009 5:40 pm

We will certainly be very interested to hear what kind of speed you will achieve @1500 RPM.

kdlewis1975 · **Posted:** Mon Aug 03, 2009 10:48 pm

I don't know how many of you are interested in attempting this yourselves. I figure most of us are in the 60,000 to 80,000 range for mileage and we're counting down the miles and trying to figure out what we're going to do. I haven't seen many numbers reported for what the dealership will charge, but it's probably $1000 to $1500 for parts and labor. A favorite local mechanic will probably be a little cheaper, but it's still doing to hurt.

The guys at GDE are willing to film the job when they do it on one of their mules. I guess the question is would people be willing to pay a nominal fee for an instructional video showing how to perform the timing belt change? ...or make donations to cover the cost of a camera for them to do the filming? It's not quite fair to expect them to "help" us for "free."

Disclaimer...I don't work for them...just looking for the proverbial "win-win" solution that helps everyone out. Some of us know what we're doing with this, I suspect many of us (I'm one of them) are on the fence in terms of whether we'll jump in.

linewarbr · **Posted:** Tue Aug 04, 2009 9:36 am

Our member from South America did an excellent write-up in the tech section on changing the timing belt.

http://www.lostjeeps.com/forum/phpBB3/vie ... hp?t=45522

kdlewis1975 · **Posted:** Tue Aug 04, 2009 11:31 pm

linewarbr wrote:

Our member from South America did an excellent write-up in the tech section on changing the timing belt.

http://www.lostjeeps.com/forum/phpBB3/vie ... hp?t=45522

That is a very nice write-up indeed with good pictures. It certainly demystifies a lot of things. I missed it because it was posted last Sunday, and I did the search a few days before that. The job seems much more doable now.

Tinman · **Joined:** Mon Apr 10, 2006 10:45 am **Posts:** 308

I'd pay for an instructional video. I plan on doing it myself and buying the tools. I'll be a few years from now.

Tinman · **Joined:** Mon Apr 10, 2006 10:45 am **Posts:** 308

That is a nice write up. That, and a FSM is probably all you need.

ChileanKJ · **Posted:** Sat Aug 08, 2009 1:53 pm

Glad you like my how to

Tinman · **Joined:** Mon Apr 10, 2006 10:45 am **Posts:** 308

Yes, thank you very much. That'd come in handy later on.

Chile - I really want to get down there sometimes. Nice place.

Timing belt replacement intervals.

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