VTC Gears?
06-06-2007 | 09:09 PM
#27
Thread Starter
Registered User
Joined: Jan 2007
Posts: 215
From: Port Townsend (Home) and Bellingham (School), WA
Looked in the engine mechanical part of the FSM that I have PDF version. Couldn't find anything on it, only found one mention of VTC anything. Maybe I'm looking in the wrong part, wanna guide me? So far there is nothing I've not been able to find in a repair manual on the miata, but this is different.
06-06-2007 | 09:18 PM
#28
Registered User
Joined: Nov 2003
Posts: 3,672
From: Gerber, CA
There are 4 screws that hold the center cap on the the VTC CAMS. Remove the screws. The spring is right there. Take out the old spring, pop in the new spring and install new o-rings, then just put it all back together.
06-07-2007 | 04:49 AM
#30
Jack Of All Trades
Joined: Jun 2004
Posts: 2,296
From: Acton, California
3rd, and to elaborate a little farther, you need to disconnect the PTU, CAS, & coolant temp sensors, and then remove the two upper t-belt covers.
But, don't forget, only do this after pissing in your mechanics drivers side window.
But, don't forget, only do this after pissing in your mechanics drivers side window.
06-07-2007 | 06:37 AM
#31
Thread Starter
Registered User
Joined: Jan 2007
Posts: 215
From: Port Townsend (Home) and Bellingham (School), WA
Originally Posted by CanyonCarver
But, don't forget, only do this after pissing in your mechanics drivers side window.
06-07-2007 | 09:57 AM
#34
Bad Speller
Joined: Sep 2004
Posts: 1,832
From: Moreno Valley, CA
Originally Posted by 91zxtt
What a crock of sh*t....Find out which car that mechanic owns and **** into the driver's side window. It's just the springs.
Has anyone ever heard of a cam gear wearing out?
Has anyone ever heard of a cam gear wearing out?
06-07-2007 | 12:15 PM
#36
Jack Of All Trades
Joined: Jun 2004
Posts: 2,296
From: Acton, California
Actually, I have heard that the VTC mechanisms inside the cam gears do wear out. The cam gears don't normally get replaced when you do a rebuild, so I could believe that as a motor reaches the end of its second life, that the cam gears are pretty tired.
06-07-2007 | 09:26 PM
#37
Registered User
Joined: Nov 2003
Posts: 3,672
From: Gerber, CA
Originally Posted by ZLover4Life
... and here's the kicker... if cam gears did wear out... would they tick?
Either way,...you still need to **** in the window.
06-07-2007 | 10:17 PM
#38
Ruff Ryder
Joined: Sep 2005
Posts: 6,140
From: palm desert
Originally Posted by 91zxtt
on top of that....if they do tick, and nobody is around, does it really make a sound? Quite the mind bender....
Either way,...you still need to **** in the window.
Either way,...you still need to **** in the window.
06-09-2007 | 12:24 AM
#45
Encyclopedic Knowledge
Joined: Aug 2005
Posts: 3,316
From: Naperville, IL
NVCS = VTC
http://www.twinturbo.net/net/viewmsg...msg_id=1843670
Light Load
At light loads and below 6100 rpm, NVCS is OFF with the intake valves retarded. This helps to promote a smooth idle and engine stability.
Medium to Heavy Load, < 6100 rpm
At higher loads but lower RPM's, it is possible for air that has flowed into the cylinder to bounce back out again. This decreases volumetric efficiency and therefore an earlier valve closure is desired. So under these conditions NVCS is ON and the intake valves are advanced by 20 degrees. Doing this can increase engine torque in this range by close to 20 lb-ft.
Medium to Heavy Loads, > 6100 rpm
Now at higher RPM's, whereas before the problem was that air was bouncing back out through the intake port, now the problem is that not enough air has had a chance to flow in yet. In order to take advantage of inertia effects, a later valve opening is preferred, even if it is the same duration. So at high revs, NVCS is now switched OFF and the intake valves are retarded back 20 degrees to their original position.
At light loads and below 6100 rpm, NVCS is OFF with the intake valves retarded. This helps to promote a smooth idle and engine stability.
Medium to Heavy Load, < 6100 rpm
At higher loads but lower RPM's, it is possible for air that has flowed into the cylinder to bounce back out again. This decreases volumetric efficiency and therefore an earlier valve closure is desired. So under these conditions NVCS is ON and the intake valves are advanced by 20 degrees. Doing this can increase engine torque in this range by close to 20 lb-ft.
Medium to Heavy Loads, > 6100 rpm
Now at higher RPM's, whereas before the problem was that air was bouncing back out through the intake port, now the problem is that not enough air has had a chance to flow in yet. In order to take advantage of inertia effects, a later valve opening is preferred, even if it is the same duration. So at high revs, NVCS is now switched OFF and the intake valves are retarded back 20 degrees to their original position.
06-09-2007 | 01:47 PM
#48
Über User
Joined: Sep 2005
Posts: 9,532
From: lemont, Illinois
probably, becuase honda's uses a solenoid sorta setup that releases oil flow to activate the V-tec lifters aka letting the larger cam lobe do its work, you can controll teh solenoid, this is just computer controlled, no larger cam lobes none of that, totally different method of function.
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