Low versus high-end torque
07-21-2003, 06:51 AM
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Low versus high-end torque
1977 911s with 2.7 motor and low miles. Most everyone who has driven this car agrees that it runs great especially over 4000, but is surprisingly low on power at the low end of the range (<2000). Is that “normal”? Is the power band on this biased to the high end that much?
Thanks.
Thanks.
07-21-2003, 08:09 AM
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No, not on my (Canadian) 77 2.7 911. In fact, if anything, the 2.7 is very strong in the low-midrange. By that I mean, it pulls hard from about 2k and up.
My guess is that you have a "hotter" cam than stock.
-MAS
My guess is that you have a "hotter" cam than stock.
-MAS
07-21-2003, 09:23 AM
#4
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Most 911s have this problem. But normally the cars are driven above 3500 keeping the power on demand for that quick pass or coming out of a corner. These engines are made for horsepower not torque. I do have an early 911, so I don't have the torque issue as much as the later 911s that have emissions equipment.
Hope this answers your question
Hope this answers your question
07-21-2003, 09:42 AM
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Regarding the SCs vs the 2.7 litre engines. I've driven several SCs, and oddly enough, they are peakier (the power comes on higher) than the 2.7's. I'm not sure why this is, but a typical 2.7 should have reasonably good low end pull. As I mentioned before, it's likely that you have a non-stock cam(s).
-MAS
-MAS
07-21-2003, 10:12 AM
#6
RL Technical Advisor
Your observations about your engine are entirely normal. Thats simply the way these feel.
Just look at the HP/torque graphs at the back of the owner's manual and you will see this for yourself. Note the shape of the torque curve,...
Its possible that someone slipped a set of SC cams in there but CIS engines cannot tolerate much cam at all and the choices are all very close to each other.
Just look at the HP/torque graphs at the back of the owner's manual and you will see this for yourself. Note the shape of the torque curve,...
Its possible that someone slipped a set of SC cams in there but CIS engines cannot tolerate much cam at all and the choices are all very close to each other.
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07-25-2003, 12:42 AM
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a '77 Calif dizzy has a vacuum retard that met then current smog requirements.. the routine is to plug the vac line.. then set your total timing.. low rpm operation should noticably increase using only mechanical advance.. and the oil temp may decrease.............Ron