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post #1 of 5 (permalink) Old 06-01-04, 03:29 AM Thread Starter
Often has bolts left over
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Compression Ratio question

G'day fellas

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?

cheers fellas.

1992 DC LTD 5.0
Duel exhaust, Genie extractors, Ported E7 heads, ported lower HO inlet, 70mm maf, Underdrive Pullies
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post #2 of 5 (permalink) Old 06-01-04, 07:17 AM
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Re: Compression Ratio question

Head porting, if done right can give good improvements. How about running premium unleaded in it when you can't get gas. This way you can go up a bit higher again with comp. and still be safe. All engines vary, but on premium a ratio of 9.5:1 should be safe, but as with the porting, you might have to play with fuel mixtures and ignition timing.
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post #3 of 5 (permalink) Old 06-01-04, 08:53 AM
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Re: Compression Ratio question

i run 10.1:1 on ULP
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post #4 of 5 (permalink) Old 06-02-04, 03:49 PM
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Re: Compression Ratio question

I would stroke it.

It has begun - Why is my battery in the boot?
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post #5 of 5 (permalink) Old 06-02-04, 06:17 PM
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Re: Compression Ratio question

Supercharge it, Buy a 2.0l hairdryer from a wrecker!

ED Fairmont Ghia 5.0L
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