Benzine
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| posted on 25/11/09 at 08:15 PM |
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Compression qu.
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? 
The mental gymnastics a landlord will employ to justify immoral actions is clinically fascinating. Just because something is legal doesn't make
it moral.
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02GF74
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| posted on 25/11/09 at 08:23 PM |
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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.
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Volvorsport
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| posted on 25/11/09 at 08:42 PM |
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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 .
www.dbsmotorsport.co.uk
getting dirty under a bus
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Canada EH!
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| posted on 25/11/09 at 09:57 PM |
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Octane rating can be lower, quieter exhaust, less chance of pre-ignition, more torque.
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MikeRJ
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| posted on 25/11/09 at 10:17 PM |
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quote:
Originally posted by Canada EH! more torque.
Less torque!
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baz-R
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| posted on 27/11/09 at 12:23 AM |
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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.
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