compression onlow compression head?

tractorguy2 · Oct 1, 2018

How much compression should a 41 SC Case with the low compression "fuel Burner" head have?

mmfan55 · Oct 1, 2018

From my perspective: having near uniform readings across the cylinders is more important than how much. I have 3 compression testers and will get 3 different readings on same cylinder if I check with them all. That is on engines in the 200# plus range. May not be much difference on lower compression engines but will look like more.

tractorguy2 · Oct 1, 2018

I was getting 50# on all four cylinders is why I was wondering.

Nedd · Oct 1, 2018

In my experience any compression less than 75 psi requires attention. New Rings or valve grind or both. SC regular head with pop-up pistons I would expect to be 120-140. Regular pistons 90-120. Low compression head 80-100. And as mentioned fairly even on all four cylinders.

casecollectorsc · Oct 2, 2018

Is that with a little oil in the cylinders?

tractorguy2 · Oct 2, 2018

mmfan55 · Oct 2, 2018

Also: compression should be a bit higher on warm engine over cold. Also be sure carburetor is wide open when checking. Limiting air into cylinders will reduce compression.

kevinthefixer · Oct 2, 2018

(quoted from post at 04:48:00 10/02/18) Is that with a little oil in the cylinders?

find it good practice to run it "dry", that is without adding oil to the cylinders, first then do it again after adding a tablespoon of oil or so. A large increase after soaking the rings with oil indicates worn rings as a rule of thumb. Does your tractor run poorly or smoke a lot? Are you trying to solve a problem or just trying to get an idea what shape your engine is in?

compression onlow compression head?

tractorguy2

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