Alternative fuel engine build??
10-31-2009, 09:02 PM
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Alternative fuel engine build?? Replacing a worn TBI 350 in my crawler with a new to me low miles 03 LQ9... I'm going to run propane for fuel , any recommendations for a cam profile taking into consideration the lower BTU's(-15%) and high octane(117) of LP?
A large portion of the negative effects of the lower BTU's can be offset buy taking advantage of the high octane and running higher compression than a comparable gasoline engine. I do know LP engines like lots of timing and long durations..."valve on seat" time promotes cooling.
It has stock 317's that I'm planning on upgrading with the appropriate springs/P-rods/etc. I was also going to do a LS2 timing set with the cam install.
I'm running a MSD 6010 and Edelbrock Performer manifold with LP mixer capable of supporting 400hp continuous and upto 650 for short (20 seconds) bursts. I'm also running a set of slightly modified ( for clearance) long tube Pacesetter f-body headers.
Whats it take to get 11-1 compression with a LQ9 ...swap out the heads ? mill the 317's?
How much of a head mill before the intake needs to be machined?
When does PTV clearance come into play?
Looking to make good strong power throughout .. no need for anything above 6K.
I know it's different from most "which cams" questions but it's worth a try.
Thanks Jeff
A large portion of the negative effects of the lower BTU's can be offset buy taking advantage of the high octane and running higher compression than a comparable gasoline engine. I do know LP engines like lots of timing and long durations..."valve on seat" time promotes cooling.
It has stock 317's that I'm planning on upgrading with the appropriate springs/P-rods/etc. I was also going to do a LS2 timing set with the cam install.
I'm running a MSD 6010 and Edelbrock Performer manifold with LP mixer capable of supporting 400hp continuous and upto 650 for short (20 seconds) bursts. I'm also running a set of slightly modified ( for clearance) long tube Pacesetter f-body headers.
Whats it take to get 11-1 compression with a LQ9 ...swap out the heads ? mill the 317's?
How much of a head mill before the intake needs to be machined?
When does PTV clearance come into play?
Looking to make good strong power throughout .. no need for anything above 6K.
I know it's different from most "which cams" questions but it's worth a try.
Thanks Jeff
Last edited by 3+3Crawler; 10-31-2009 at 09:09 PM.
