My volvo engine has a standard compression ratio of 10:1. I've used pistons from a volvo turbo engine to reduce this to 9:1 for forced induction.

The problem is I've little time to work on it at the moment and I just want to get it running and on the road. At the moment I have a megasquirt set up and was going down the forced induction route. That will require a fair bit more fabrication so I was thinking of going down a simpler route for now, and then later I can go forced induction.

What are the pros and cons of running a lower compression n/a? (carbs/bike carbs/whatever) I presume it'll drink more but that doesn't really bother me for a weekend toy... and what would be the most simple route to take to get it running? 3 webers in a row?

pros - plenty of land rovers sunning on 8.something CR so no probs there. won't need to worry about timing as pre-ignition is less an issue.

higher CR is related to power and efficiency so con is you have less power hence will be slower plus slightly higher mpg.

if its megasquirted , do that .

if not 6 bike carbs and megajolt , or maybe even running a jaguar dizzy and points .

i reckon if you can a manual ecu from a 960 , you could even have it running on the std injection given a couple of weekends .

otherwise i wouldnt worry about it - itll just feel down on popwer , most redblocks run 9:1 or lower std .

Octane rating can be lower, quieter exhaust, less chance of pre-ignition, more torque.

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Originally posted by Canada EH! more torque.

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should be no biggy will not be as efficent (a little smoother)
loads of pre cat engines had lower comp ratios in th 9's
tho getting max ign advance with unleaded may be a bit trickey today.