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Old 10-24-2010, 02:42 PM   #11
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Re: VX adjustable cam questions

Also keep in mind that just a 10% variation at light load makes a huge difference. The ecu will make up for the lean condition of the one cylinder and run the other three richer. Then you have three cylinders down on power and wasting more fuel then they need.

Plus if you have that one lean cylinder pinging and your running a knock sensor the ecu will pull timing across the board and kill power even more.

Its just one big lose lose.
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Old 10-24-2010, 07:23 PM   #12
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Re: VX adjustable cam questions

Does the 93' vx have a knock sensor? It's the Canadian federal model. Cleaned the injectors today and just got back from a 100 mile test drive. Smoother, for sure, noticeably more power after lean burn kicks out, almost imperceptible at lean burn. I'll know more at next fill up.
I'm gonna order the intake mani gaskets and get that cleaned soon too.
Thanks for the info!
B
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Old 10-24-2010, 07:30 PM   #13
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Re: VX adjustable cam questions

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Originally Posted by benfrogg View Post
Does the 93' vx have a knock sensor? It's the Canadian federal model. Cleaned the injectors today and just got back from a 100 mile test drive. Smoother, for sure, noticeably more power after lean burn kicks out, almost imperceptible at lean burn. I'll know more at next fill up.
I'm gonna order the intake mani gaskets and get that cleaned soon too.
Thanks for the info!
B

Does the 93' vx have a knock sensor? Nope I was just generalizing.

Nice!!! Glad to hear its running smoother. I will be waiting for the results.

Good Luck!!!
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Old 10-24-2010, 09:58 PM   #14
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Re: VX adjustable cam questions

Another note worth mentioning is that the warmed up base idle increased by about 250rpms after cleaning. This could be from a couple of factors, but I'm hoping its because there is a more accurate amount of fuel being sent to the motor.
I took an hour drive and adjusted it back down to 500 or less (just using tach, not really exact).
B
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Old 10-24-2010, 10:04 PM   #15
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Re: VX adjustable cam questions

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Originally Posted by benfrogg View Post
Another note worth mentioning is that the warmed up base idle increased by about 250rpms after cleaning. This could be from a couple of factors, but I'm hoping its because there is a more accurate amount of fuel being sent to the motor.
I took an hour drive and adjusted it back down to 500 or less (just using tach, not really exact).
B
Do you have a vacuum gauge? It would be interesting to see if the vac increased also?
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Old 10-24-2010, 11:02 PM   #16
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Re: VX adjustable cam questions

I don't. I am curious to find out if maybe I've got a vacuum leak at the injectors now. I'll look at the plugs tomorrow and see if they are showing lean (bright white) or not. The number one cylinder always used to run leaner than the rest; I'm assuming dirty injectors is why. I'm just over 206k and I'm certain it's never been done.
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Old 10-25-2010, 04:09 AM   #17
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Re: VX adjustable cam questions

I'm learning some interesting stuff in this thread. I've never believed that dirty injectors could reduce fuel economy, but the explanation that one dirty injector resulting in a lean exhaust results in the computer compensating by making everything rich makes sense.

So, now...how is vacuum related to injectors? In my vehicles the injectors are completely electric, as far as I can tell.
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Old 10-25-2010, 06:47 AM   #18
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Re: VX adjustable cam questions

Just a quick comment on the original question- in my opinion, the only way a cam gear might be needed (assuming the original cam timing was optimal) is if you have had the head milled significantly (for example to increase compression). The decreased distance between the upper and lower cam gears would very slightly retard cam timing.

An adjustable cam gear would let you advance the cam slightly and get that distance back and factory time the cam.
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