Adjusting Cam Gear for Optimal Gains...
Adjusting Cam Gear for Optimal Gains...
I have never purchased a cam gear or ever installed one before, but I have read up on the basics and understand how they work to increase performance. I noticed they have a timing adjustment where you can advance or retard...what exactly does THAT do and how do you know where to adjust it so that you are getting optimal performance gains from it? I've seen a lot of topics about cam gears, but most are asking HOW to adjust them from what I've seen (like the topic prior to this one). I have also heard an LT1 and LS6 with cam gear and noticed a "loping" from the engine. I imagine that "loping" pattern in the exhaust note is due to a slowed timing...am I on target with that conjecture? Someone set me straight here.
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In SOHC engines (our D17's for example) there's only one cam gear and adjusting it adjusts the position of the cam shaft relative to the timing belt and crank shaft. Adjusting it makes the intake and exhaust valves open either sooner or later. In SOHC engines the cam gear can only change the power curve, so you'll have to figure out where you want the engine to make the most power. For racing you'll probably want to get it so that you move the power curve up into the higher rpm's as far as possible. That way you'll get a nice little increase in power when you're in the higher rpm's (which is where you're at when you're racing).
It really isn't going to do anything for you unless you have done modifications that require you to change the timing. Something like a new cam. It's a single cam engine and honda has already set it to it's optimal specs. You need a dyno to tune it tho.
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Quote
[hr]Originally posted by: Grey
In SOHC engines (our D17's for example) there's only one cam gear and adjusting it adjusts the position of the cam shaft relative to the timing belt and crank shaft. Adjusting it makes the intake and exhaust valves open either sooner or later. In SOHC engines the cam gear can only change the power curve, so you'll have to figure out where you want the engine to make the most power. For racing you'll probably want to get it so that you move the power curve up into the higher rpm's as far as possible. That way you'll get a nice little increase in power when you're in the higher rpm's (which is where you're at when you're racing).[hr]
[hr]Originally posted by: Grey
In SOHC engines (our D17's for example) there's only one cam gear and adjusting it adjusts the position of the cam shaft relative to the timing belt and crank shaft. Adjusting it makes the intake and exhaust valves open either sooner or later. In SOHC engines the cam gear can only change the power curve, so you'll have to figure out where you want the engine to make the most power. For racing you'll probably want to get it so that you move the power curve up into the higher rpm's as far as possible. That way you'll get a nice little increase in power when you're in the higher rpm's (which is where you're at when you're racing).[hr]
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Taken from: Import Tuner: Making Sense of Cam Gears
Quote
[hr]On a SOHC engine, an adjustable cam gear will allow you to move the power curve to a specific area in the rpm band as described above. Like moving your peak power on a high-revving Honda to max out at 4000 to 5000 rpm. Typically to improve bottom end power advancing a SOHC engine will do the trick and the converse is true to enhance top end power.[hr]
[hr]On a SOHC engine, an adjustable cam gear will allow you to move the power curve to a specific area in the rpm band as described above. Like moving your peak power on a high-revving Honda to max out at 4000 to 5000 rpm. Typically to improve bottom end power advancing a SOHC engine will do the trick and the converse is true to enhance top end power.[hr]
if u want tourque u have to retard the timing, so u get low end power. but i dont know how much or to what degree. i advanced my time, to 7 degrees. everyone says thats to much but i got the best gains when set at 7 and it was a nice improvement! u go through the rpm band alot easier, doesnt take so long to redline and u can feel the engine workin easier then before.
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You are wrong advancing the timing is good for low end and retarind for high end:
"On a SOHC engine, an adjustable cam gear will allow you to move the power curve to a specific area in the rpm band as described above. Like moving your peak power on a high-revving Honda to max out at 4000 to 5000 rpm. Typically to improve bottom end power advancing a SOHC engine will do the trick and the converse is true to enhance top end power."
"On a SOHC engine, an adjustable cam gear will allow you to move the power curve to a specific area in the rpm band as described above. Like moving your peak power on a high-revving Honda to max out at 4000 to 5000 rpm. Typically to improve bottom end power advancing a SOHC engine will do the trick and the converse is true to enhance top end power."
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I have seen other 7 gens at the track with a cam gear and they say it made there car
run slower.
If you want power gains after 3K then you should have your ECU chipped at
JetChip...it will re-map your fuel for 89 octane and advance the igniton timing
5 degress. this is where you will get power..advanceing the ignition timing...not
the exaust timing.
Only thing is...you can't run higher than a 35 shot of N2O with advanced ignition timing
run slower.
If you want power gains after 3K then you should have your ECU chipped at
JetChip...it will re-map your fuel for 89 octane and advance the igniton timing
5 degress. this is where you will get power..advanceing the ignition timing...not
the exaust timing.
Only thing is...you can't run higher than a 35 shot of N2O with advanced ignition timing
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if you advance the timing you MUST use premium fuel so the engine does not detonate, see, companies could give you a more advaced timing setting from the factory for a little more power, but, on an economy car like the civic(most cars actually), they would rather sacrifice a few hp's so that their customers dont have to spend the extra money, now on luxury cars, the owners dont usually care, and the same with sports cars, they WANT the extra power so, theyre willing to pay more
Last edited by EternalVTEC; Oct 30, 2003 at 06:46 PM.
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