[ROVERNET - UK] P6 interference/free running?

[David Sheuring]

Hi Ron, The reason it interfers is because of the
ledge of the piston will make contact with the valve
when the piston is TDC and the valve is fully
extended.
Hope that helps.
David
--- Nathan Obuch <nathanobuch at yahoo.com> wrote:

> Ron,
> 
> I did say "I believe" the p6 2000 engine is free
> wheeling! I was repeating info I heard here some
> time
> ago- my timing chain rattles, and I put forward the
> question about what I was risking if it jumped time
> or
> snapped. Hmm. Guess I may be risking more than I
> thought!
> 
> I'm a bit surprised that with the design of the
> pistons that it's an interference engine. 
> 
> Nathan 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> --- Ron Venter <venterrh at telus.net> wrote:
> 
> > Nathan and Vern,
> >                     You have me worried! I
> recently
> > fitted a 2000 
> > engine with new 9:1 pistons. With the head off,
> the
> > crankshaft 
> > rotated fully. With the head on but without the
> > timing chain 
> > connected, I could not turn the crankshaft a full
> > 360 
> > degrees  --  almost but not quite. With the timing
> > chain on 
> > everything rotates smoothly. What have I done
> wrong?
> > The engine is 
> > not yet back in the car, so I don't know if it
> > actually runs.
> >                                                 
> > Regards,
> >                                                   
>  
> >     Ron V.
> > 
> > At 09:09 AM 07-12-09, you wrote:
> > >  I have
> > > > one question. What is
> > > > the difference of a free running design and a
> > > > interference design?
> > >
> > >A free running or free wheeling engine has enough
> > >clearance between the valves (when open) and the
> > >pistons (when at Top Dead Center) that they don't
> > >collide if the timing chain or belt fails and the
> > >valve timing gets out of sync.
> > >
> > >An interference engine can bend valves or worse
> if
> > the
> > >chain/belt breaks.
> > >
> > >I believe the original P6 engine is free
> wheeling.
> > >
> > >Regards,
> > >
> > >Nathan
> > >
> > >
> > >
> > >
> > > 
> >
>
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