Re: More timing belt questions.

[Anthony Pelletier <vwnuts@yahoo.com>]

becareful with JH engines too.  If you cam a JH in now
is an interface motor because of the increased lift. 
just something to note.  I know this because I learned
it the hard way.  I forgot to align to TDC before I
took off the old belt.  I was just so excited that I
finally broke the crank pully bolt loose.  

--- drew <drew@dyermaker.cs.uoguelph.ca> wrote:
> 
> The stock JH motor is 8.5:1 and is not an
> interference motor.  It _IS_ a
> 1.8L motor, but usually on this list 1.8L refers to
> a 1.8L 16V, and 2.0L
> refers to the 2.0L 16V.  1.6, 1.7 and 1.8L 8V motors
> are generally lumped
> into the 8V category... :)
> 
> Generally only motors with compression ratios of
> 10.0:1 or higher are
> interference motors.  I think a deciding factor for
> valve damage also
> revolves around the valve's angle to the piston. 
> 16V motors tend to be
> worse for valve damage I think because the valves
> are coming into the
> combustion chamber at different angles than the high
> compression 8V
> motors.  I have not personally seen any 8V high
> compression motors trash
> their valves (with the exception of a few diesels),
> which is not to say
> that it doesn't happen, just I don't think it's
> quite as often as with the
> 16V motors (at least not with North-American spec
> motors, anyways.)
> 
> I have seen diesel motors where a valve will smack a
> piston hard enough to
> leave an impression in the crown, but not bend the
> valve, because the
> valve is pretty much straight up-and-down over the
> piston, while on the
> 16V the valves are angled to the crown, meaning
> they're begging to be bent
> when they get smacked... :)
> 
> Hope this helps,
> 
> Drew
> 
> 
> On Thu, 20 Apr 2000, John Karpus wrote:
> 
> >    
> > 
> >  Is the "JH" 8v engine an interference engine,
> will that engine go to if the
> > timing belt snaps?
> > 
> >     Also is the "JH" engine one the engine
> referred to as 1.8L?
> > 
> > thanks,
> > 
> > 
> > Johnny
> > 1983 Scirocco KARMANN - Black
> > 1998 Cherokee Sport Chile Pepper Red
> > 
> > --
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> > 
> 
> Drew MacPherson, Network Analyst, University of
> Guelph
> 
> drew@dyermaker.cs.uoguelph.ca           |  visit the
> Massey-Harris page:
> http://dyermaker.cs.uoguelph.ca/~drew   | 
> http://m-h.cs.uoguelph.ca
> 
> 
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