Compression Check

[brdhntr]

I'm new to this forum and new to airboats. Could someone please tell me what I should expect to have when I do a compression check on a Continental O470 (GPU)
Thanks in advance
brdhntr

 

[Des Moines Boater]

You should expect low readings if the cylinders haven't been rebuilt. You want to see the mid to high 70's over 80 on the differential compression. Less than 70's is usually bad rings or pitted cylinder walls on the 220 GPU.

 

[speed wheelie]

Leak down test tells the tale.!!

 

[speed wheelie]

You should expect low readings if the cylinders haven't been rebuilt. You want to see the mid to high 70's over 80 on the differential compression. Less than 70's is usually bad rings or pitted cylinder walls on the 220 GPU.

By the way I'll have your cylinder ready to ship by friday