Compression Ratio, Will I be able to tell the difference? Options

[sdoolin]

Rebuilding(ish) my 2056. On my first build I was able to achieve a compression ratio of very nearly 9.0:1. With this build, I am having to add .020 spacers below the jugs to get any measurable deck height in the jugs. I am calculating a compression ratio of 8.6:1.

Will I notice the loss in compression ratio?

[Jack Standz]

Modified #2.

Bolt transmission to engine. Remove spark plugs. Make 1000% sure the fuel system and ignition system are disabled.

Hook up gauge to where the oil pressure sensor goes (use correct thread gauge). Here's one gauge kit:


https://www.harborfreight.com/engine-oil-pr...-kit-62621.html

Hopefully, you will have good oil pressure when you crank it.

[sdoolin]

Modified #2.

Bolt transmission to engine. Remove spark plugs. Make 1000% sure the fuel system and ignition system are disabled.

Hook up gauge to where the oil pressure sensor goes (use correct thread gauge). Here's one gauge kit:


https://www.harborfreight.com/engine-oil-pr...-kit-62621.html

Hopefully, you will have good oil pressure when you crank it.

Thanks for this, and the link. This will be my plan. Carbs won't be installed, no plugs. So no fuel and no spark. I'll order that gauge.

Cabman - I have checked end play, per the instructions in my 40 years old Haynes manual. Installed 2 shims, then flywheel, measured, subtracted .004 (or whatever the manual says), and then selected the third shim based on that measurement. I have not re-measured after third shim selection (flywheel not yet installed).