924Board.org

Guest · Posted: Tue Jun 12, 2001 6:06 pm Post subject:

From: Peter
Email: peter_warner25@hotmail.com
Date: 12 Jun 2001
Time: 18:06:00

I don't know when the timing belt on my car was last changed so thought it would be worth doing in the near future. Two questions:

1. Is it a complicated/time consuming job
2. Someone once told me that if the timing belt breaks on a 2.0 924 engine, the valves won't hit the pistons due to the fact that indentations are machined into the face of the pistons - is this true? (when the timing belt broke on my old Ford, it bent 3 valves due to the pistons hitting the valves)

Thanks
Peter

Guest · Posted: Tue Jun 12, 2001 8:44 pm Post subject:

From: joe d.
Email: jod3511@home.com
Date: 12 Jun 2001
Time: 20:44:41

I ts easy just dont loose track of the timing if you do look on the crank and look on the cam for your marks but try and line up your cam timing mark before you start then its just off and on

.. i was wondering what would happen if 1 broke

Guest · Posted: Tue Jun 12, 2001 9:38 pm Post subject:

From: Eddie
Email: Edd1em@hotmail.com
Date: 12 Jun 2001
Time: 21:38:56

arent the valves in the cylinder with a very fast moving piston? so what would happen if a piston hit the valve say going 300mph? with torque of more than 1000lbs? hmmm, let me think.... id say the 1/4inch valve stem wouldnt stand a chance. but thats just me....

Guest · Posted: Tue Jun 12, 2001 11:53 pm Post subject:

From: larso
Email: l_porsche@hotmail.com
Date: 12 Jun 2001
Time: 23:53:05

only on the Porsche 931

924 is non interference so unless your piston came loose and took flight........!!!

Guest · Posted: Wed Jun 13, 2001 2:21 am Post subject:

From: Peter
Email: peter_warner25@hotmail.com
Date: 13 Jun 2001
Time: 02:21:32

Thanks - that's what someone else told me too. I KNOW most cars would bend valves, but was told the 924 wouldn't

Cheers
Peter

Guest · Posted: Wed Jun 13, 2001 4:01 am Post subject:

From: larso
Email: l_porsche@hotmail.com
Date: 13 Jun 2001
Time: 04:01:18

you wouldn't believe this, but, on an interference engine we have (honda accord) the timing belt snapped while driving and the car didn't bend any valves, weird weird weird, the belt must have skipped a couple teeth so not enough to do damage but enough to stall the car, and then it must have snapped when it at like 10 RPM because i don't understand why it didn't mash.

Guest · Posted: Wed Jun 13, 2001 4:15 am Post subject:

From: Peter
Email: peter_warner25@hotmail.com
Date: 13 Jun 2001
Time: 04:15:16

Wow, you must have been really lucky - I was pulling away from some lights when the timing belt on my old Ford Escort snapped, and I thought I was lucky when I only bent 3 valves!

At least I know that if the timimg belt snaps on the 924 on the way to my dad's house (he's going to give me a hand to change it), it won't be the end of the world!

Cheers,
Peter

Guest · Posted: Wed Jun 13, 2001 12:28 pm Post subject:

From: brian
Email: bcookt06394@yahoo.com
Date: 13 Jun 2001
Time: 12:28:21

I just got word from my mechanic at Moorespeed and the bad news is I have 2 bent valves in my '82 931. Good news is the lower block is OK. There's just a small dent on top of the piston. Also, the head gasket was blown between #2 and #3.

Larso, I feel your pain. However, I am willing to shell out the bucks to get it fixed because I like the car. It looks good, feels good, and if it is only slightly faster than my '81 924 I will be very happy!

bc

Guest · Posted: Wed Jun 13, 2001 4:11 pm Post subject:

From: larso
Email: l_porsche@hotmail.com
Date: 13 Jun 2001
Time: 16:11:21

why did you bend valves again?

its a completely different situation wtih me brian, the timing belt breaks on my car every 50 miles of driving.
If i still had my car running, right now i would be blowing teh F((k out of the engine with boost controllers without an intercooler, a car with a turbo that does 0-60 in 8-9.5 seconds is not worth it, you might as well get a NA 88 honda accord family car that can do the same, and its not a turbo and its a 2.0 litre!! you HAVE to modify this car, its not a fast turboed car.

Guest · Posted: Wed Jun 13, 2001 4:28 pm Post subject:

From: brian
Email: bcookt06394@yahoo.com
Date: 13 Jun 2001
Time: 16:28:34

I can only guess that the belt jumped to bend the valves. It never actually broke.

As for the argument of the 924/931 cars being slower than must modern family cars, I see your point. My wife's 4cyl Camry with the AC on and a baby in the back seat can smoke my NA. But, if I wanted bang-for-the-buck with lots of options for more power I would get a 5.0 mustang or something. Then I would be like every teenager cruising through Sonic on a Friday night. (probably a Texas thing)

However, I enjoy a little eccentricity. I'd rather drive an MG than a Miata. A Trooper than an Explorer. A Porsche than a Honda. Now, don't attack me with the AMC/Audi/Jeep/Vanagon BS. I've been on this board for a while.

Finally, as for the reliability issue, I've got two 924s for myself, one has only needed an alternator and fuel pump and now this one is getting a rebuit head. Total investment including the cars: $5000. About the cost for a transmission and head job on the '88 Accord. I can live with those costs and the associated burdens. But I'll never have to mess with our Camry and I'm fine with that also!

bc

Guest · Posted: Wed Jun 13, 2001 8:44 pm Post subject:

From: larso
Email: l_porsche@hotmail.com
Date: 13 Jun 2001
Time: 20:44:42

you better make damn well sure that it won't jump teeth again! otherwise you ar walking right into my words, WHAT IS THE SOURCE OF IT JUMPING TEETH!!!! FIND OUT before you fix teh car, don't just assume that it will work this time around, why will it?!?!
I was going to rebuild my head on my 931, but i never found what the problem was, so i was forced to part it out! One 931 guy phoned me and he said "is it just the top part thats damaged, i know a guy who has a head for you"....SO WHAT??? its just gonna happen again and bend the valves of the new head, BRIAN FIND THE SOURCE BEFORE YOU DO THIS AGAIN!!! pLEAse!!!!!!!!!!!
If you can't find why it jumped teeth, then don't put the car back together until you do!!!

Guest · Posted: Wed Jun 13, 2001 9:03 pm Post subject:

From: brian
Email: bcookt06394@yahoo.com
Date: 13 Jun 2001
Time: 21:03:08

Dude, relax!! The guy I bought the car from did a bad job putting it back together! The idler pulley was loose! I heard it rattling after the fact. This can happen to any car not properly maintained. Lesson learned. It's unfortunate but not the end of the world.

Look, we all see your point and it sucks that you've had such bad experiences. But, look at any message board out there about any type of car and you will see that crappy things happen to good people! Why do you think people lease new cars! They don't want to deal with the crap!

My two cents.

bc

Guest · Posted: Wed Jun 13, 2001 9:57 pm Post subject:

From: larso
Email: l_porsche@hotmail.com
Date: 13 Jun 2001
Time: 21:57:37

when you talk to people that aren't on the message boards, and tehy have problems, and you talk to people that are on ebay, and you sell parts to at least 50 people, and they all have cars that are broken, and then i go look at other message boards about another type of car, and they are talking about performance upgrades (not things breaking) then i wonder, whats up with the 924. it broken and it aint fixee

Guest · Posted: Wed Jun 13, 2001 10:01 pm Post subject:

From: larso
Email: l_porsche@hotmail.com
Date: 13 Jun 2001
Time: 22:01:40

just remember the 924 was my first car i bought, haven't truly owned my own car until the 924, and for a first impression....wow, what can i say, what a WONDERFUL car, but why don't she got wishbone suspension, porsche couldn't afford it??!?! uh huh.

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Guest · Posted: Wed Jun 13, 2001 10:18 pm Post subject:

From: brian
Email: bcookt06394@yahoo.com
Date: 13 Jun 2001
Time: 22:18:06

I guess it depends on what you're looking at. eBay always has a ton of Porsche parts on auction for all models. Same for BMW. Does that mean they break more often? Maybe. Or does it mean that those that do break or are wrecked have value post mortem?

I can go find a grill for an Accord in any junk yard in town. Not necessarily true for other makes. Why are you parting out your car? You want to make some bucks and you know people will pay. Would you go to this much trouble with an '88 Accord?

One of my favorite cars is the E34 BMW M5. Go look at an E34 board and see how many problems they have. Then again, they are low production specialty cars like the 924. There are probably more Explorers made in 2 months than Porsche's made in 20 years! Go see how many recalls there are on Ford trucks!

Point is everyone can find fault with something. The people on this board are trying to look past the faults and find something fun. If they don't, then they'll find a new hobby. So it goes.

That's my sociological soapbox for the day.

bc

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