is my timing gear failing?

hi guys, is there an easy way to find if the nylon timing gear is failing, like maybe jumped a few teeth? are
these engines interference or non interference?
thanks!

sean..

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Re: is my timing gear failing?

If it did that, it would run like crap if at all.

If it runs, you can check the ignition timing to see if it is way off.
If it doesn't run, you can check the valve timing in regards to TDC.

On Fri, Jul 31, 2009 at 8:20 PM, bad.bucket<bigscooter@...> wrote:
> hi guys, is there an easy way to find if the nylon timing gear is failing, like maybe jumped a few teeth? are
these engines interference or non interference?
> thanks!
>
> sean..

--

-- 
-STEFAN
http://www.at-speed.com
http://photos.at-speed.com
VSCCA comp #374
VRG comp #97

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Re: is my timing gear failing?

bad.bucket wrote:
> hi guys, is there an easy way to find if the nylon timing gear is failing,
> like maybe jumped a few teeth? are these engines interference or non
> interference?

The V-4 is not an interference engine.

The timing gear is not likely to jump a tooth or several, which CAN 
happen in a chain driven engine. (Had that happen one time on a 
customer's early 99 with the Standard/Triumph built engine.

Andy in PDX OR

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Re: MSS Exhaust...again

RE: Re: MSS Exhaust...again

I didn't know Jetex still made an exhaust for the Sonett.  Is it a Y-extractor or an OE-type?

-Eric

Derek wrote: 
>    
>  Do you REALLY need the MSS
> system? The Simons/Jetex one works well,  sounds “sporty”, and
> won’t do your ears in when running out to a meet somewhere across country. 
>  It’s annoying that
> regardless of the exhaust system, they all seem to have the resonance at about
> 60-65mph. Heterodyning of the exhaust 2 ports? 
>    
>  Derek UK 
>      

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Re: MSS Exhaust...again

I am in South Eastern CT with a 68 Sonett with the aluminized OEM system from the Sonett Club of Sweden (very
quite and negligible resonance) and a 73 96 with the Jetex (noticably quiter than the MSS I took off but
retains the resonance at 55mph).

Harry Shettles

--- In vSAAB@..., Eric P <ericprzy <at> ...> wrote:
>
> Hi Peter,
> 
> I wish I was closer.  I'm down in CT, about 3hrs from Boston.
> 
> -Eric
> 
> 
> ________________________________
> From: Peter Maitland <peter <at> ...>
> To: vSAAB@...
> Sent: Friday, July 31, 2009 2:58:11 PM
> Subject: [vSAAB] Re: MSS Exhaust...again
> 
>   
> --- In vSAAB <at> yahoogroups. com, Eric P <ericprzy <at>  .> wrote:
> >
> > I know this issue has been beaten to death but I have a highly subjective (and probably silly  to
some) question for the group:  what does an MSS exhaust sound like?
> >   
> 
> Hey Eric,
> Where do you live?
> IIRC you're in the Boston area?
> You can hear 3 different VSaabs with that system fitted here at my house...
> I am near 495/90 in MA.
> All 3 V4 motors, all 3 in different states of tune.
> A Sonett V4, A 96, and a 95.
> 
> Peter
>

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Re: Re: MSS Exhaust...again

On Aug 1, 2009, at 10:24 PM, Harold Shettles wrote:

> I am in South Eastern CT with a 68 Sonett with the aluminized OEM  
> system from the Sonett Club of Sweden (very quite and negligible  
> resonance) and a 73 96 with the Jetex (noticably quiter than the MSS  
> I took off but retains the resonance at 55mph).

I suspect that all the "tuned-Y" systems are going to have a resonance  
band a bit above 4000 rpm... the resonance (aka tuning) is what  
provides the performance improvement, and ~4400 rpm is the power peak  
of the engine, according to the graph in the shop manual.

On further consideration I think Eric would be fine with the two- 
muffler MSS system; I took a long highway drive today in my Sonett III  
equipped with my homebrew version of same (single-muffler MSS plus  
tractor resonator) and it's not as loud as my original post might have  
suggested. Other than the tailpipe burble (which is readily audible  
since it's right behind your head with very little to stop it) the  
loudest noises actually are tire noise and road noise, which are going  
to predominate regardless of what exhaust system is fitted.

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Craigslist Find: Vermont Rust Buffet

http://burlington.craigslist.org/pts/1298776574.html

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Re: is my timing gear failing?

im worried cuz this last year my friend's Volvo's nylon gear failed, but luckily it was a non interference
engine. he just put on a new one and he was off and running. my Saab was running great, but last time i started
it runs like crap. it feels like it's out of time. i rebuilt the carb and checked for vacuum leaks, and all
cylinders are firing, but it still runs the same(crap).

sean..

--- In vSAAB@..., Andy Peterson <adpete <at> ...> wrote:
>
> bad.bucket wrote:
> > hi guys, is there an easy way to find if the nylon timing gear is failing,
> > like maybe jumped a few teeth? are these engines interference or non
> > interference?
> 
> The V-4 is not an interference engine.
> 
> The timing gear is not likely to jump a tooth or several, which CAN 
> happen in a chain driven engine. (Had that happen one time on a 
> customer's early 99 with the Standard/Triumph built engine.
> 
> Andy in PDX OR
>

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Re: Re: is my timing gear failing?

bad.bucket wrote:
> im worried cuz this last year my friend's Volvo's nylon gear failed, but
> luckily it was a non interference engine. he just put on a new one and he
> was off and running. my Saab was running great, but last time i started it
> runs like crap. it feels like it's out of time. i rebuilt the carb and
> checked for vacuum leaks, and all cylinders are firing, but it still runs
> the same(crap).

Have you done a compression test? That's the FIRST thing to do. If "it 
feels like it's out of time", have you checked the ignition AND valve 
timing? Have you checked to see where the valves are at TDC?

The timing is not going to jump a tooth or two. if the timing gear is 
stripped, the car isn't going to run at all. There's something else 
going on. Believe me, I've seen stripped timing gears, and if the gear's 
that far gone, your engine's going to stop.

Andy in PDX OR

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