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MG MGF Technical - DOHC or not?

Can anyone advise me please. The 1.8 vvc is a DOHC engine I am understand. Is the 1.8 MPI a single OHC motor?
Many thanks for your time.
Chris
Chris

Chris,
They are both DOHC,but the VVC has variable valve timing wheras the MPI has fixed cams.
Robert
R J Hemphill

the VVC is triple cam if I understand it correctly
Will Munns

The VVC is Very Very Complicated
Johan Slagter

The VVC is very very Clever!!!!!
Graeme A Glasgow

Some of the smaller capacity k Series engines are single OHC
Bob Millar

were - min spec now 1.1 16v
Patrick Beet

To add further confusion : A well known quiz on rallies; "How many cams on a MFG VVC ?"
Answer: 5 in all, 4 on the inlet and one outlet cam.

/ Carl.
Carl Blom

Hi Carl,

How many Camshafts, I hope, as there are 16 cams on the VVC and mpi - as you well know!

Regards, Kes - just nit-picking.
Kes

Hi Kes,
yes- of course - but for me cam is the whole unit as short for "camshaft". Difficult this language....
When we are at it, ever so often I see the word "breake" instead of "brake". Is this an accepted english spelling of the word brake as in brakepads etc ?

BR, Carl.
Carl Blom

>Is this an accepted english spelling

No, it's common english mispelling!

Four inlet cams? is that one per cylinder - or is there some sort of caming the camshaft (IYSWIM)
Will Munns

My understanding is that the inlet side has 2 half hollow camshafts and 2 other camshafts which pass through the middle; at first appearances it therefore looks like only 2 camshafts but it's actually 4. There's a good site explaining it all somewhere, I'll try to find the link...

Tim.
Tim Jenner

Not the link I was looking for, but there's an explaination on this very site...


"The first obvious thing one sees is that the inlet camshaft is not a single casting as in most engines, but is in four sections. Inlet valves for cylinders 1 and 2 are controlled by lobes on a half cam-shaft driven by a VVC Mechanism (the most important components of which are two drive rings) at the front of the engine. Inlet valves for cylinders 3 and 4 are controlled by lobes on a half cam-shaft driven by a second VVC Mechanism (incorporating its own drive rings) at the rear of the engine, the drive for the latter is taken from the exhaust camshaft."

See http://www.mgcars.org.uk/news/news174.html
Tim Jenner

So that'll make the VVC a POHC...
Rob Bell

Yep i agree, 1.8 K4 MPi is DOHC, 1.8 K4 VVC is QOHC

DOHC is dead!, Long live the quin-cam!!! LOL :-)

SF
Scarlet Fever

The VVC still says "Twin Cam" on the cam covers though...maybe we could get some replacements made up! :)
Tim Jenner

Okay, quin sounds better than pent-cam Andy - and is probably more correct too! ROFL

>> maybe we could get some replacements made up! :) <<

LOL Tim - yup, that'd be kewl! 8o)
Rob Bell

I'm still waiting for someone to come up with some MG branded spark plug covers (like the Lotus ones) - hint hint!
Tim Jenner

I feel the same Tim :-)

SF
Scarlet Fever

This thread was discussed between 04/06/2004 and 07/06/2004

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