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RossD

Ew10J4S - Disabling Vvt

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RossD

So my current Emerald K3 ECU wont support the VVT on this engine, so my current plans are revolving around disabling the VVT, but in a manner which means it can be reinstated in future if required.

 

Unfortunately, its not as simple as unplugging the VVT solenoid and putting an adjustable cam pulley on the existing inlet cam, as you would have oil pouring out of the end of the cam, where the oilways feed the phaser mechanism. So a rather odd idea entered my head this morning.

 

How about replacing the current inlet cam, with its internal oilways for the VVT, with an exhaust cam from the same engine, i.e. run the engine with 2 exhaust cams?

 

The exhaust cam physically fits on the inlet side, all the bearings line up etc. Added bonus is that the exhaust cam actually has slightly more duration than the standard inlet and about the same in terms of valve lift.

 

Is there something obvious I'm missing which means you couldnt do this? I know the original Mi16 ran with the same cam on the inlet and exhaust, so there doesnt seem anything fundamental which means you cant do this in my mind.

 

Opinions?

 

 

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Tom Fenton

Personally I would upgrade the ECU to run the VVT. Power and driveabllity there on a plate in my eyes.

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dcc

You could always look at running a 138 cam, or even an xu

 

Insert cheeky ninja face

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RossD

Interesting you say about the XU cams - they look similar, do they physically fit?

What are the specs of the GTi6 cams for example? (Lift and duration)

 

The EW 138 cams are a bit of a backward step, total lift is over a 1mm lower. Hence the idea regarding the EW180 exhuast cam.

 

Upgrading the Emerald isnt an option, I've already spoken to them about this. Which would mean a new ECU. I'm still not convinced with the Megasquirt based stuff, so thats £600 - £800 on an Omex or DTA. Which, bang for buck, is not good value in my eyes.

I'm coming from a cam'd and throttle bodied TU 1.6 8v, so I dont think the lack of VVT will be noticeable coming from that!!

Edited by RossD

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welshpug

try finding another 180 cam without buying an engine!

 

if you're set on fixed timing why not look into an inlet cam upgrade? newman, catcams piper etc I'm sure will sell you just an inlet from their ph1 or ph2, 270etc grinds.

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jackherer

Emeralds hold their value really well, you could ebay it and put the money towards an ECU that can run the engine.

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Tom Fenton

Yep exactly that, ok I said upgrade but equally I meant sell yours and buy a better one. Will a K6 run the VVT? A second hand K3 is £400-500? of anyone's money.

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dcc

I was talking of a catcam 138 profile :)

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RossD

Thanks for the opinions chaps, have taken onboard and I'm exploring a couple of options - one that will enable me to keep the VVT, another which involves a mild catcams VVT delete profile. I suspect the VVT option is a non-starter, even the ECU's that claim to be able to fully control it cannot, they have switching points rather than a continuously phased approach, which is what is required.

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dcc

Is that true of s60 dta?

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Biggles

Continuously variable VVT is principally a fuel economy / driveability thing. If your ECU only switches then a hot cam with it gives you power top end where you want it and driveability low down. Ok not an OE solution but if you use the car every day then it would open the door to a hotter cam than might be acceptable on a day to day basis.

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Tom Fenton

I think switched VVT would be better than no VVT.

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