[Spridgets] Interference

[Weslake1330]

I bought a very secondhand Mk3 Ford Cortina to replace the Mini I had
rolled (!) and changed the belt of unknown age and mileage sometime during
my ownership with no drama except learning that engine/cam timing was a
different thing to ignition timing.

On Fri, 6 May 2022 at 04:03, Rick Fisk via Spridgets <
spridgets at autox.team.net> wrote:

> I bought a new Fiat X1/9 in 1975.  The timing belt was supposed to be
> changed every 50,000 miles.  At 40,000 miles I sold the car to a
> girlfriend.  At 53,000 miles the belt broke with the engine running at idle
> while she was waiting for a red light.  At least half of the valves were
> bent.
>
> On May 5, 2022, at 10:19 PM, Greg Higgins via Spridgets <
> spridgets at autox.team.net> wrote:
>
> 
> I owned a 1977 Honda Civic with a 1.2 litre engine, I bought the car new.
> The
> timing belt had to be changed every 50.000 miles on that model. I was 6000
> miles
> over the timing belt's best before mileage. The timing belt broke while
> going to work one afternoon.
> There was no damage to the engine, a new belt and I was good to go. I made
> sure I was under
> 50,000 miles when I replaced that one. Lesson learned.
>
> Greg Higgins
>
> On Thu, May 5, 2022 at 4:46 PM Michael MacLean via Spridgets <
> spridgets at autox.team.net> wrote:
>
>> I don’t suppose having 1.5 rockers helps the situation much either.
>> Mike M
>>
>> On Thu, May 5, 2022, 1:41 PM Weslake1330 <weslake1330 at gmail.com> wrote:
>>
>>> I always thought it depended on the cam and rockers whether or not the
>>> valves would hit the piston if the belt broke on an A-series.  A long time
>>> ago my dyno guy said for my engine if the belt broke the valves would
>>> definitely hit the piston.  No, I don't have the full valve lift figure
>>> handy.
>>>
>>> On Thu, 5 May 2022 at 20:16, Rick Fisk via Spridgets <
>>> spridgets at autox.team.net> wrote:
>>>
>>>> Forgot to add both valves were bent as well.
>>>>
>>>> > On May 5, 2022, at 3:01 PM, Rick Fisk <refisk at chartermi.net> wrote:
>>>> >
>>>> > Yes, the 1275 is an interference engine.  In this photo you can see
>>>> where the valves beat the crap out of the top of the piston.  The piston
>>>> broke in half at the wrist pin and the top half of the piston stayed at the
>>>> top of the bore.
>>>> >
>>>> >
>>>> >
>>>> >> On May 5, 2022, at 2:41 PM, Michael MacLean via Spridgets <
>>>> spridgets at autox.team.net> wrote:
>>>> >>
>>>> >> 
>>>> >> When I rebuilt my 1275 for the Bugeye I converted to belt drive for
>>>> timing.  Keeps the timing spot on.  It occurs to me that like other cars
>>>> the timing belt has a limited life and must be changed.  To be honest the
>>>> instructions did not say when this should occur as far as I can remember.
>>>> To be fair, the rebuilt engine has only a little over 3K miles on it, but
>>>> the question arises about valve interference if the belt breaks.  To my
>>>> knowledge, I don't think so, but I have been proven wrong before.  Anyone
>>>> know if a 1275 would be an interference engine if the belt broke?
>>>> >> Mike MacLean
>>>> >> ------------------------
>>>> >>
>>>> >> spridgets at autox.team.net
>>>> >>
>>>> >> Donate: http://www.team.net/donate.html
>>>> >> Suggested annual donation: $12.75
>>>> >>
>>>> >> Archive: http://www.team.net/pipermail/spridgets
>>>> http://autox.team.net/archive
>>>> >>
>>>> >> Unsubscribe/Manage:
>>>> http://autox.team.net/mailman/options/spridgets/refisk@chartermi.net
>>>> ------------------------
>>>>
>>>> spridgets at autox.team.net
>>>>
>>>> Donate: http://www.team.net/donate.html
>>>> Suggested annual donation: $12.75
>>>>
>>>> Archive: http://www.team.net/pipermail/spridgets
>>>> http://autox.team.net/archive
>>>>
>>>> Unsubscribe/Manage:
>>>> http://autox.team.net/mailman/options/spridgets/weslake1330@gmail.com
>>>>
>>> ------------------------
>>
>> spridgets at autox.team.net
>>
>> Donate: http://www.team.net/donate.html
>> Suggested annual donation: $12.75
>>
>> Archive: http://www.team.net/pipermail/spridgets
>> http://autox.team.net/archive
>>
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/spridgets/g.h.higgins@gmail.com
>>
> ------------------------
>
> spridgets at autox.team.net
>
> Donate: http://www.team.net/donate.html
> Suggested annual donation: $12.75
>
> Archive: http://www.team.net/pipermail/spridgets
> http://autox.team.net/archive
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/spridgets/refisk@chartermi.net
>
> ------------------------
>
> spridgets at autox.team.net
>
> Donate: http://www.team.net/donate.html
> Suggested annual donation: $12.75
>
> Archive: http://www.team.net/pipermail/spridgets
> http://autox.team.net/archive
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/spridgets/weslake1330@gmail.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/spridgets/attachments/20220506/61ea80db/attachment.htm>