Compression for 9n

mgk2081 · Apr 24, 2015

I read on a site that the minimum compression for a 9n is 90lbs. I have between 105 and 115 on all 4 cylinders. Can anyone tell me what the ideal compression should be or what it is supposed to be?
thank you
mike

HCooke · Apr 24, 2015

Anything over 100 is good to go. Are you having problems?

tburch · Apr 24, 2015

I'll trade you my 40-45s for your 105-115s! (Not even sure if mine will fire yet)

Todd

mgk2081 · Apr 24, 2015

thanks for the response, yes i am bringing this thing back from the dead. i have replaced a lot of parts and having a heck of a time getting it to start. I'm thinking now that i have a timing issue in that i can't get it advanced enough. when it does run it almost sounds like it is firing on partially open exhaust valves. it has a front mount dist. and i'm sure you know it is a pretty crude way to get the timing set correctly.

mgk2081 · Apr 24, 2015

Yea, wow that might not be enough to get it done.

Jim WI · Apr 24, 2015

It's really easy to get the firing order wrong. Check it to make sure you have it firing 1-2-4-3. Every front mount distributor cap I've seen has the numbers cast into the plastic near the wire terminals. The cylinders are numbers 1-2-3-4 from front to back (nothing strange there, at least).

mgk2081 · Apr 24, 2015

thanks for that tip. i made and mistake once too and was sure i had the firing order correct but i had # 3 and 4 crossed.

Tom N MS · Apr 24, 2015

40-45 ---------No good.....

Tom N MS · Apr 24, 2015

U need the compression issue fixed before messing with timing and such..I'd bet timing
isn't your problem.

howdy1960 · Apr 24, 2015

TOH makes a jig that allows you to set timing at the bench

mgk2081 · Apr 25, 2015

thanks for all the great info. what is TOH? yea, the guy with the 40-45 compression probably has internal issues but mine with over 100 lbs i'm thinking is a timing problem.
i'll be back with gov. issues when i get my timing straightened out.
thanks again

mgk2081 · Apr 29, 2015

(quoted from post at 19:04:20 04/24/15) TOH makes a jig that allows you to set timing at the bench

howdy 1960, last week you told me that TOH has a jig for setting timing. what is TOH?
thanks

Tiger Joe · Apr 29, 2015

(quoted from post at 10:49:24 04/29/15)

(quoted from post at 19:04:20 04/24/15) TOH makes a jig that allows you to set timing at the bench

Click to expand...

howdy 1960, last week you told me that TOH has a jig for setting timing. what is TOH?
thanks

TOH is "The Old Hokie" he is a member on this site.

he sells a jig that allows you to set the timing
http://www.windyridgefarm.us/TimingJig.html

mgk2081 · Apr 29, 2015

thank you for the info. i really appreciate it
mike

Hobo,NC · Apr 29, 2015

105 to 115 would be ideal..

Compression is notcher problem... A average of 110 and you are chit'N in high cotton...

I know what the min speck of 90 means do you are anyone else know...

Compression for 9n

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