I my car just back from the dealer and my compression was good 160psi x4. I was just wondering what exactly is the nominal compression for the SOHC? How much better could my compression be if any. BTW my car only has ~65k miles and its a 91

 

Spec is 173 psi, mimimum of 121 psi, with a max variation between cylinders of 26 psi. Sounds like you are fine.

 

where did you find that info? I couldn't find it in my haynes even!

 

It's in my Haynes manual. Just keep looking. I'd give the page number but I don't have it in front of me right now.

Nathan
'91 323 (soon to be 1.8L DOHC 323)

 

Mazda FSM.

 

It's section 2B-1 in the Haynes Manual.

Nathan
'91 323 (soon to be 1.8L DOHC 323)