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Underbody braces, turbos and more!

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PostPosted: Tue Jan 04, 2005 9:21 pm 
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Location: So. Cali
This past weekend while putting mk2 gti seats in my mk1 I snagged my friends blow off valve so I could turn up the boost a little more and not shim the pressure relief valve on the intercooler. Anyway, I was coming home from work yesterday and the timing belt broke. I walked home got my SLK, went bought a new belt and put it on so I could drive to work today. After I got it running I noticed the BOV sounded different (stronger/more air flow??) and "maybe" the car runs a little stronger. My question is...... Is it possible that the timing was a tooth off or something before (I changed head gasket a few months ago)? Any ideas?

Sorry so long.

Thanks,
Andy


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PostPosted: Tue Jan 04, 2005 10:11 pm 
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That's completely possible. You also might've moved the timing up a notch farther on your new install... how many degrees is a notch? I've misplaced the number...


Chris

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PostPosted: Wed Jan 05, 2005 8:47 pm 
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i think 1 tooth on the cam timing gear equals about 6 degrees. if it was down 1 tooth it makes the engine dog pretty badly. if it's up one tooth from normal and you don't change the spark timing, it makes the engine seem to have had a super tune-up.

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PostPosted: Wed Jan 05, 2005 9:12 pm 
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Thanks for the replies guys. It ran pretty well before but didnt seem to pull as hard as it did when I test drove it or since the belt broke. I was hoping to find this possible, my friend said "no way, it wouldnt run".


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PostPosted: Wed Jan 05, 2005 9:15 pm 
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Good thing G10 engines are non-interference engines. You could crank the cam timing 120* out of sync and not trash anything. :)

Not that you'd want to, but it's a nice safety cushion for n00bs. (Not saying that anyone here is...) :lol:


Chris

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PostPosted: Wed Jan 05, 2005 11:23 pm 
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CJDavE wrote:
Good thing G10 engines are non-interference engines. You could crank the cam timing 120* out of sync and not trash anything. :)

Not that you'd want to, but it's a nice safety cushion for n00bs. (Not saying that anyone here is...) :lol:


Chris


Yeah, been there done that. 1991 VW GTI 16valve snapped the timing belt on the racetrack :( Bent all 8 intake valves (2 more then the g10 has :) ). I was thinking all this while walking home to get the new belt. Even came home and did a search on "interference" to make sure I was right about it not being such a motor ( yeah I know, most if not all turbo cars are non-interference).

Thanks again,
Andy


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PostPosted: Wed Jan 05, 2005 11:29 pm 
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t3 ragtop wrote:
i think 1 tooth on the cam timing gear equals about 6 degrees. if it was down 1 tooth it makes the engine dog pretty badly. if it's up one tooth from normal and you don't change the spark timing, it makes the engine seem to have had a super tune-up.


And then if you have suprf1y's timing advance cam (mine's a 6* advance), a tooth back will almost run normally, a tooth forward will ping like crazy at idle (I'm suprised I didn't burn a valve).


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