Re: Tappets or Rocker/Roller assembly
wj51fut said:
I forgot to mention that the V-TEC doesnt always kick in at 5,800 rpm, sometimes its @6k or 6,500 or even 7k!! sometimes it doesnt kick in at all!!
So i spoke to Tom @TGM today and he said that it could be a number of things...
1, Oil pressure
2, V-TEC solenoid
3, V-TEC control unit
4, V-TEC controller on the cam
He said that he has heard these to go and that if it were the one on the cam then that would eplain the none V-TEC part and the noise as it has its own oil well and pump?!? Apparently it can make a ticking noise and can make the car run 'lumpy'.
Its going up there on the 26th for an oil pressure test and to see if we can change afew parts around.
VT-Doo: I have put another bottle of slick 50 in and ran two tanks of fuel in it and still making the noise.
If you had kpro a simple datalog could reveal several things...
VTEC, not V-TEC.
1. Oil pressure - hopefully not the problem as that would probably mean new oil pump etc. and running around with low oil pressure is never a good thing..
2. VTEC Solenoid - Rocker arm oil control solenoid? Hopefully this is the problem as you don't need to take the whole engine apart to fix this. See picture:
3. VTEC control unit - The K20A doesn't have a VTEC Oil pressure switch (or rocker arm oil pressure switch) like the K20A2. Although, I'm not sure if that's what tgm meant with "control unit". It's a shame we don't get the pressure switch as it could give a early warning about oil pressure problems like if the engine drops out of vtec when it shouldn't - you get a CEL.
4. VTEC controller on the cam - There isn't anything else VTEC related on the cam except the VTC cam gear on the intake cam and that's just adjusting the cam angle 0°-50°. I do believe you can still hit VTEC even if the VTC would be broken (=locked at xx°), at least this is possible with kpro without any special modifications. However, the stock ecu might give a cel and the vtec "kick" would feel weird as the cam angle is wrong. overall the engine would run badly with a locked vtc gear. if it's locked at anything else than 0° then the idle should also be higher.
There is just one oil pump in a K-series engine.
Noisewise I dunno.. low oil pressure can eat up the engine to a slow (or very fast) death and cause noise (bearings, cam tower #5 etc.) a clogged vtec solenoid would be a perfect problem, but I don't think it could cause noise. VTC gear... well yeah, if it somehow is able to move just a bit but not to the wanted angle the it might give some noise as it keeps trying to move?
anyway, good luck.