dephaser system removal

[mrl]

not sure if this has been asked before and iv missed it but iv had a search and couldnt see anything so here goes.

if i wanted to remove the dephaser pulley would i just need to block up the valve hole which sits in the head and use a solid bolt to stop the oil flow?

does anyone run standard cams with the dephaser removed?

or peep that run aftermarket cams have any of you removed the dephaser?

any advice welcome

 

[jon_r]

The dephaser IS the inlet cam pulley. I think you are talking about the VVT solenoid.

 

[Chip-mk1]

If you want to just stop it operating, simply unplug the dephasor solenoid.

If you want to remove it completely for reliability reasons (they arent bad really but are still a potential point of failure) by a solid pulley instead.

Piper do them:

http://www.pure-motorsport.co.uk/details.php?itemid=166

 

[Cookson]

So if you remove the plug, so its never active, does this mean it will be down or up on power through the revs?

 

[Andyrg@ ClioTurbo]

remove and advance the timing by 8 degrees on the inlet cam, meaning you have VVT on, may cause idle surge!

 

[Chip-mk1]

So if you remove the plug, so its never active, does this mean it will be down or up on power through the revs?

If you remove the plug, it will never advance.

As for where it will be in the rev range power wise, it depends on your engine, for example on Porkies ITB clio I have actually turned the VVT on in the midrange and then turned it off at the top end since we altered the cam timing to maximise midrange torque for him, as with the static advance and then the dephasor advance as well it was actually losing power at the top of the rev range.

 

[Cookson]

So on a standard lump, as it advances low down, it woulf just run s**t with no guts til it got up the rev range?

 

[Dan519]

So on a standard lump, as it advances low down, it woulf just run s**t with no guts til it got up the rev range?

no. it will just be down on power everywhere above the normal switch point.

non vvt pulley will need non vvt cams fitting

 

[Tom-173]

Would i be better using vvt or not with my 172 im turboing? Would a megane 225 inlet cam pulley fit?

 

[Chip-mk1]

So on a standard lump, as it advances low down, it woulf just run s**t with no guts til it got up the rev range?

Yes mate, thats correct, at the very top it switches back off again anyway so at that point it will therefore be identical anyway, but upto there it would be down on power.

 

[Chip-mk1]

Would i be better using vvt or not with my 172 im turboing? Would a megane 225 inlet cam pulley fit?

Personally I think the best combination is to use it but to map it so it only advances when you are at big throttle angles and small boost values, that way it helps you spool a little quicker and gives it a little more torque during spool, but once you are on boost its better for EGT's not to run it really as you cut down on overlap.

That said, these engines drive very well boosted even without the advance, so there is a lot to be said for just unplugging it and keeping it nice and simple.