[Spridgets] Interference

[Greg Higgins]

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
>>> >> ------------------------
>>> >>
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