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SpaceX Testing - Merlin Ablative
Test of Merlin 1a engine with ablative chamber on Horizontal Test Stand 1 (HTS1), McGregor, Texas

The initial version of the Merlin engine (1A) flew two times in 2006 and 2007, with a chamber pressure of 5.39 MPa and 73,000 lbf sea level thrust. For comparison, the current full thrust version of the Merlin 1D has a chamber pressure of 10.8 MPa and a sea level thrust of 190,000 lbf.
Here's a nice video of an earlier 1D version test. Great engines.

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