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Austin Healey 100-6 Compression

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donnercm

Freshman Member
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Hello,

I have been having a problem with my 100-6 back firing on acceleration with HD6 carbs. I have rebuilt the carbs, checked the ignition timing, changed heat ranges on the plugs and its still there. I recently check the compression and i found i have a couple cylinders down.

#1 - 140psi
#2 - 100psi
#3 - 140
#4 - 135
#5 - 120
#6 - 145

What is an acceptable variance btw cylinders?

Thanks,

Chad
 
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