Model: 1275GT
Year: 1980
If someone can do the sums and confirm my maths please.
Combustion Chamber: 16.4cc
BK450 Payen Head Gasket: 4cc (from minispares)
Piston ~1 mm from top at TDC: 4cc
21962 Pistons: 8cc dish
Standard MG Metro 1275 block,
Bore 70.61mm, Stroke 81.23mm: 318.08cc
Ratio 10.8:1
Sound ok??? with 21962 pistons, Aldon Red Dizzy with lumination electrics, 296 Scattercam, lightened flywheel, cross pin diff.
Compression Ratio
Started by
GTM Marty
, Mar 07 2010 10:05 PM
4 replies to this topic
#2
01smartc
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One Carb Or Two?
Posted 07 March 2010 - 11:37 PM
Close 
Dont forget ringland of 0.7cc
Takes it to 10.63:1
Chris @ Smart Performance
Dont forget ringland of 0.7cc
Takes it to 10.63:1
Chris @ Smart Performance
#3
Ouster
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Posted 08 March 2010 - 03:00 PM
What's the max compression ratio for regular 95 unleaded?
#4
Cooperman
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Uncle Cooperman, Voted Mr TMF 2011
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Posted 08 March 2010 - 03:13 PM
You should use 97 octane with 10.6 CR and make sure the distributor curve is correct.
#5
Pauly
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Posted 08 March 2010 - 07:41 PM
Standard unleaded is usually good for ratios up to 10:1.
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