TinBoats.net
The original aluminum boat site!
Forums
New posts
Search forums
Blog
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Boats
Motors
1962 Evinrude 18hp- Compression Tests
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support TinBoats.net:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="GarageBeers" data-source="post: 512465" data-attributes="member: 32394"><p>Good morning! This 18hp has 2x cylinders. I tested compression after a few mins of the engine running to get an accurate "wet test". Top measured 98 psi and bottom measured 90 psi. Gladly they are within 10psi of each other, so I am not too worried. I did rebuild this engine. New pistons, rings, and dingle-ball honed the cylinder walls...they needed it... previous owner slammed this engine harder than a cabin screen door. What could the 8 psi difference be? Did I possibly over-hone 1 cylinder? Pistons are exact same. Spark plugs are exact same. Both combustion chambers in the head looked exact. Layed the block and head on a flat piece of glass with some emery cloth and got them dang near perfect flat and clean. New head gasket. 3x even torque sequence on all bolts. Still only 8 psi difference, so not too bad. Just more so curious if I can get them closer to +/- 5 psi or even 0. More of an OCD thing ha, I know I wont be able to tell the difference operationally</p></blockquote><p></p>
[QUOTE="GarageBeers, post: 512465, member: 32394"] Good morning! This 18hp has 2x cylinders. I tested compression after a few mins of the engine running to get an accurate "wet test". Top measured 98 psi and bottom measured 90 psi. Gladly they are within 10psi of each other, so I am not too worried. I did rebuild this engine. New pistons, rings, and dingle-ball honed the cylinder walls...they needed it... previous owner slammed this engine harder than a cabin screen door. What could the 8 psi difference be? Did I possibly over-hone 1 cylinder? Pistons are exact same. Spark plugs are exact same. Both combustion chambers in the head looked exact. Layed the block and head on a flat piece of glass with some emery cloth and got them dang near perfect flat and clean. New head gasket. 3x even torque sequence on all bolts. Still only 8 psi difference, so not too bad. Just more so curious if I can get them closer to +/- 5 psi or even 0. More of an OCD thing ha, I know I wont be able to tell the difference operationally [/QUOTE]
Verification
Post reply
Forums
Boats
Motors
1962 Evinrude 18hp- Compression Tests
Top