LSM valve spring tester - Page 2

Rick Shirey · 05-31-2009, 01:28 PM

Jesse,yes this is a small block chevrolet using Jesel shaft rockers.After checking my bracket engine this morning I went back to the superstock engine and tried again to use the removal tool.I did manage to make it work and removed four springs total.Then using my Rimic bench tester I compared readings and found quite a difference,with the bench tester being lower but more consistant.The four I tested were between 305psi and 310psi with the bench tester and between 350psi and 270psi with the LSM.I will say the lower reading ones were on cyl #7 which is the hardest to get a nice straight pull on.I also tried to calibrate the LSM as the instructions state,but it really didn't change much.While I had the springs off I experimented with shims and found .030"shim changed psi by 15psi.At this point I think I will compare my bench tester with another to make sure those readings are correct.Still doesn't explain the low readings with the LSM.Thanks again for your assistance.

Jesse Knapp · 05-31-2009, 05:48 PM

I would try the Moroso tool again and compare readings. It's good to have the bench tester.

05-31-2009, 01:28 PM	#11
Rick Shirey Junior Member Join Date: Apr 2003 Posts: 53 Likes: 0 Liked 0 Times in 0 Posts	Re: LSM valve spring tester Jesse,yes this is a small block chevrolet using Jesel shaft rockers.After checking my bracket engine this morning I went back to the superstock engine and tried again to use the removal tool.I did manage to make it work and removed four springs total.Then using my Rimic bench tester I compared readings and found quite a difference,with the bench tester being lower but more consistant.The four I tested were between 305psi and 310psi with the bench tester and between 350psi and 270psi with the LSM.I will say the lower reading ones were on cyl #7 which is the hardest to get a nice straight pull on.I also tried to calibrate the LSM as the instructions state,but it really didn't change much.While I had the springs off I experimented with shims and found .030"shim changed psi by 15psi.At this point I think I will compare my bench tester with another to make sure those readings are correct.Still doesn't explain the low readings with the LSM.Thanks again for your assistance.

05-31-2009, 05:48 PM	#12
Jesse Knapp Member Join Date: Jan 2002 Posts: 109 Likes: 0 Liked 0 Times in 0 Posts	Re: LSM valve spring tester I would try the Moroso tool again and compare readings. It's good to have the bench tester. __________________ Jesse Knapp 4899 STK, SS