Hybrid Car – More Fun with Less Gas

New Volt should get 230 mpg in city, GM says - Page 6

register ::  Login Password  :: Lost Password?
Posted by user on August 12, 2009, 6:16 pm
vaughn wrote:

Timing Chain mate, not timing belt. Both are a result or wear & tear,
battery and timing chain.

But they do, and often before maintenance schedules, mine was fried on
my Saturn 30,000k before suggested replacement. Had my power steering
pump not gone south I never would have noticed.

So let's look at expected

You've never had a timing chain/belt break have you? When they go they
often take a chunk of the engine with them.

If they are anything like a prius battery , just about zilch.

Posted by Bruce Richmond on August 12, 2009, 6:29 pm

You present a good argument below except he wrote "chain" not "belt".
It is known that people neglect routine maintainece, so engines with
timing belts are almost always designed to be non-interference
engines.  That means reguardless of the position of the camshaft when
the belt breaks there is no way the piston can hit the valves.
Replace the belt (about $0 and 5 hrs labor) and you're back on the
road.  I timing chain OTOH is never expected to break.  The car in my
driveway has 220,000 miles on the original timing chain and I have no
doubts that it will last as long as I own the car.  Because of this
such engines are often designed as interference engines.  So should
the timing chain break (it could happen, but I have never seen one) it
would bend valves, possibly damage the head, piston and maybe even the
cylinder wall.  IOW you might need a new engine.

So likelyhood of anyone having to spend $000 to fix the timing chain
damage is a whole lot less likely than needing to replace a battery.
And since we are talking about an older car here, if a timing chain
did break any normal person would get a replacement engine from a
salvage yard and do the job much cheaper.

Posted by vaughn on August 12, 2009, 6:39 pm

OOPS!  Good catch.  As you pointed out though, comparing the *certain*
degradation of a battery to the *unlikely* breakage of a timing chain is
still not valid.


Posted by user on August 12, 2009, 7:17 pm
 Bruce Richmond wrote:

This is not the case, and should never be assumed that because it has a
belt it is not an interference setup.


That means reguardless of the position of the camshaft when

Posted by Bruce Richmond on August 12, 2009, 10:44 pm
 On Aug 12, 3:17pm, u...@domain.invalid wrote:

I stand corrected.  Guess I have just been lucky :)  One of the
engines I lost a belt on is listed as an interference engine but it
still ran fine after replacing the belt.

This Thread
Bookmark this thread:
  • Subject
  • Author
  • Date
please rate this thread