G'Day Andy,
I'll put my answers/comments in-line..
On 7 Jun 2009 at 19:48, Andy Webster wrote:
>> so the engine has behaved like this since you got the car?
No... it used to be much worse --- seriously!
>> I'd be pulling off the rocker cover and watching while the engine
>> runs. make sure there isn't a poorly aligned rocker pad over an
>> exhaust valve
I have some machined alloy spacers that I bought from a lister that
would keep the rockers from shifting.
>> I'd also be looking for a valve spring that wasn't up to
>> the task or broken, Are all 1275s double valve sprung? I know mine is.
Broken I could see but I'm not sdure I have a way to tell if a spring
was not up to scratch.
>> I'd have expected fuel starvation to cause it to die off, not so much
>> backfire through the carbs.
If I keep it below 1500 - 1800 rpm it will keep running for hours
>> Having had a dodgy SU pump in the past,
>> the car used to just lose power, until I thumped the rear shelf with
>> my fist, and knocked the pump into life.
I used to keep a hammer in the trunk for that very purpose.
>> With the air filters off,
>> does one carb spit harder than the other? that might let you narrow it
>> down to either cylinders 1&2 or 3&4 or all over the place.
Both carbs, equally at the same time but spasmodic.
>> Have you had the head off this engine?
Nope... but I see that that's a job I'm going to have to do..
Many thanks for your input... much appreciated ;-))
Have a Fosters on my tab ;-))
--
Dave G. KK7SS
'65 MK III Sprite in Richland, WA
If I wake up in the morning, and I hurt, it means that I'm still
alive !!
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