Perkins 4.108 leaking injector

rotrax said:
it is the rotating parts that are balanced. The effect of combustion is not taken into account. As it matters not.
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I get what you are saying and on the face of it it makes sense. On the other hand virtually every engine i had or come across when losing a cylinder runs awfull and shakes around .The one exception a daimler 250 v8 which ran remarkable smooth on just a few cylinders.
There are numerous sources online that say it can damage an engine but most probably assume its still fueling the cylinder ?
As i read your reply - i didnt say "it will", i said "it could". Just like you reply says "its unlikely" rather than "it wont" .
If you think its ok to run as op asked why not answer his question ?
 
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Rappey said:
I get what you are saying and on the face of it it makes sense. On the other hand virtually every engine i had or come across when losing a cylinder runs awfull and shakes around .The one exception a daimler 250 v8 which ran remarkable smooth one just a few cylinders.
There are numerous sources online that say it can damage an engine but most probably assume its still fueling the cylinder ?
As i read your reply - i didnt say "it will", i said "it could". Just like you reply says "its unlikely" rather than "it wont" .
If you think its ok to run as op asked why not answer his question ?
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My brother had a Frogeye Sprite .... he blew one cylinder ... nothing was actually loose or broken off inside .. it just wasn't providing any power as it should ... but believe me - it sounded like a bag of spanners were flying around inside the engine ... and vibration was horrendous.
 
Refueler said:
My brother had a Frogeye Sprite .... he blew one cylinder ... nothing was actually loose or broken off inside .. it just wasn't providing any power as it should ... but believe me - it sounded like a bag of spanners were flying around inside the engine ... and vibration was horrendous.
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Bollocks!!!

I was I/C a 'Suntester' rolling road dynamometer at the BLMC Service School, Gate 19, Watlington Road, Cowley for 3 years.

Testing all BLMC products during the Carburettor and Tuning Courses on this Rolling road gave us the oppertunity to run engines with a plug lead off. And, at full load too!!

We NEVER experienced symptoms like you suggest. We tried different cylinders too, not any noticable difference between whichever one was not working.

The engines 'staggered' a bit, increased speed far more slowly and would not reach full RPM and wobbled about at idle speed. They obviously had less power too.

All, however, had a 'sweet spot' within their operating parameters caused by the non firing cylinder where the staggering and uneven running was less apparent.

On another occasion I had a valve seat crack between the seat and the edge of the head, losing all compression. We were 70 miles from the end of a Lands End Trial on the TRI-BSA Sidecar outfit. It was powered by a 1956 650cc Triumph T110 engine. I removed the spark plug of the offending cylinder and we finished the event. No bearing or crank damage. It ran, just like a 325cc single cylinder engine would! We did not manage to climb the final two hills!
 
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