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Car Forum / Saturn Cars / September 2007Saturn going to belts?
Browsing thru www.gmpowertrain.com, I took a look at the upcoming Astra engine. This may have been discussed here before, but here is the proof. Click on this link: http://media.gm.com/us/powertrain/en/product_services/2008/08car.htm then on the "P" link for the 1.8 engine. Viola! a belt driven engine. Now, I've nothing against belt driven engines and I'm sure that they help with noise and vibration, but what I don't like I guess is the extra expense of maintenance. I was holding out for a possible Astra, glad I went with an ION instead. I just ponder what the guys who built my car in Spring Hill are doing right now......  Signaturemarx404 > Browsing thru www.gmpowertrain.com, I took a look at the upcoming Astra > engine. This may have been discussed here before, but here is the proof. [quoted text clipped - 11 lines] > just ponder what the guys who built my car in Spring Hill are doing right > now...... That is an old picture. Do you see the Opel logo on top? It appears the webpage maker wasn't provided a pic. How often do timing chains go? I can't speak for Saturn engines with timing chains but I worked on several Ford straight 6 (300cid) engines where the delrin teeth on the cam sprocket wore and the timing slipped. I recall this happened at about 150K. The good news also about timing belts is that they are fairly easy to inspect for tension and wear. Chains often have a hydraulic tensioner which makes it even harder to see if tension is within limits without the engine disassembled. > Browsing thru www.gmpowertrain.com, I took a look at the upcoming Astra > engine. This may have been discussed here before, but here is the proof. [quoted text clipped - 11 lines] > just ponder what the guys who built my car in Spring Hill are doing right > now...... > How often do timing chains go? Usually depends on how well they are lubricated. Usually after the car rots. > I can't speak for Saturn engines with timing > chains but I worked on several Ford straight 6 (300cid) engines where the > delrin teeth on the cam sprocket wore and the timing slipped. I recall this > happened at about 150K. Thats about 3 times longer than some belts I've run into. When belts go, they dont give you a warning. Sprockets will also wear out with belts. If a mechanic doesn't know to inspect the sprockets on a belt driven engine those same problems of skipped timing will pop up. I say Fords issue was inferior steel, treatment, or poor oil/lubrication. > The good news also about timing belts is that they are fairly easy to > inspect for tension and wear. Chains often have a hydraulic tensioner which > makes it even harder to see if tension is within limits without the engine > disassembled. NSX timing belt service...$1500 dollars and up. Have fun climbing back there inspecting that. Oh and while you're thinking of belts, think CVT... I just hope that they choose to use a teflon reinforced belt as they did in the later L300 V6's. Those belts are supposedly rated at 100K intervals. >> How often do timing chains go? > [quoted text clipped - 24 lines] > > Oh and while you're thinking of belts, think CVT... You sure about that "Teflon"? I thought that they were Kevlar reinforced. Teflon impregnated in addition, - maybe. I haven't seen the specification so couldn't say for sure. The timing belts that I use in my job (electronic motion controls and robotics) are mostly kevlar core with synthetic rubber coating. Those are from Stock Drive Products http://www.sdp-si.com/ Oppie >I just hope that they choose to use a teflon reinforced belt as they did in >the later L300 V6's. Those belts are supposedly rated at 100K intervals. I have a bad habit of saying teflon when I mean Kevlar, my bad, duh. > You sure about that "Teflon"? I thought that they were Kevlar reinforced. > Teflon impregnated in addition, - maybe. I haven't seen the specification [quoted text clipped - 7 lines] >>in the later L300 V6's. Those belts are supposedly rated at 100K >>intervals. We had a 2000 LS2 with the 3.0L V6, which had a timing belt. We changed it at 160,000km, as recommended. The belt had virtually no wear on it. My mechanic friend said it would have gone another 100,000km. On timing chains, the last chain we replaced was in a 1969 car. We have since driven Chevy V6s (except for the Saturn) and have never had to deal with timing chain issues. Two of these have already gone about 300,000km and are still going! Just relating our real life experiences! David > I just hope that they choose to use a teflon reinforced belt as they did in > the later L300 V6's. Those belts are supposedly rated at 100K intervals. [quoted text clipped - 27 lines] > > > > Oh and while you're thinking of belts, think CVT... |
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