A high-pressure, double-chamber, fan-stirred, large-scale explosion facility is proposed for measurements of laminar and turbulent burning velocities, S(L) and S(T), of centrally-ignited hydrogen and carbon monoxide syngas/air mixtures over an initial pressure range of p = 0.1-1.0 MPa. Results show that lean syngas laminar flames at elevated pressure are highly unstable resulting in cellular structures all over the expanding flame front surface, where S(L)similar to p(-0.15) having a relatively modest decrease with pressure as compared to lean methane flames where S(L)similar to p(-050). Contrarily, as to lean syngas turbulent flames, values of ST increase with increasing pressure (S(T)similar to p(0.15)) at a fixed r.m.s. turbulent fluctuating velocity (u' approximate to 1.4 m/s). Moreover, it is also shown that increasing u'/S(L) is still a way much more effective in increasing values of S(T)/S(L) than increasing pressure. Finally, discussions are offered and area for further studies identified. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.