Compression Ratio question
Im going to be doing some work on my dad's '93 econovan 2.0. the plan is to hot it up a bit so it can tow his boat easier when he is touring in it. the van runs 99% on LPG but needs to be able to run on petrol as LPG isnt always available in the country. I was thinking upping the compression may give it a bit more poke with the LPG. here are the engine specs..
Type - 4cyl 1998cc
bore x stroke - 86x86
compression ratio - 8.6:1
what compression ratio can you run on standard ULP? as most of you know this is the same engine as is used in the telstar/626. it can be stroked to 2.2, but this isnt favourable as the bottom end only has 100k on it and doesnt really need a rebuild. what other types of modification can i perform to the head to give it more grunt? I plan to port it, will this give a noticable improvement?
1992 DC LTD 5.0
Duel exhaust, Genie extractors, Ported E7 heads, ported lower HO inlet, 70mm maf, Underdrive Pullies