Hello forum..! I need to know what the compression ratio of my engine would be..? It is a 4.2 67 car built in April. Is there a standard for these engines or a what to find out..?
Thanks you very much.!
Pablo
Compression ratio..? How to know.?
#1 Compression ratio..? How to know.?
Pablo
1956 Mercedes 190 SL
1973 Porsche 911 T targa
1969 Porsche 912
1970 Alfa 1300 GT junior Scalino (sold)
1966 Jaguar e type FHC (unfortunately sold)
1967 Jaguar e type OTS 1.25 series
1976 Toyota FJ40 (I learned to drive with this one)
1956 Mercedes 190 SL
1973 Porsche 911 T targa
1969 Porsche 912
1970 Alfa 1300 GT junior Scalino (sold)
1966 Jaguar e type FHC (unfortunately sold)
1967 Jaguar e type OTS 1.25 series
1976 Toyota FJ40 (I learned to drive with this one)
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#2 Re: Compression ratio..? How to know.?
Stamping on the engine block is 7E13106-9 does this mean the compression ratio should be 9.6:1..?
Thank you..!
Pablo
Thank you..!
Pablo
Pablo
1956 Mercedes 190 SL
1973 Porsche 911 T targa
1969 Porsche 912
1970 Alfa 1300 GT junior Scalino (sold)
1966 Jaguar e type FHC (unfortunately sold)
1967 Jaguar e type OTS 1.25 series
1976 Toyota FJ40 (I learned to drive with this one)
1956 Mercedes 190 SL
1973 Porsche 911 T targa
1969 Porsche 912
1970 Alfa 1300 GT junior Scalino (sold)
1966 Jaguar e type FHC (unfortunately sold)
1967 Jaguar e type OTS 1.25 series
1976 Toyota FJ40 (I learned to drive with this one)
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#3 Re: Compression ratio..? How to know.?
The 9 suffix indicates 9:1 compression from the factory.
Are you in the process of rebuilding the engine? If so give consideration to the fact that previous head and block skimming will push CR above 9:1 if you use 9:1 new pistons without CCing the head and calculation it accurately.
Too much compression on these engines can be bad and make it very hard to time the engine properly without pinging.
We routinely used 8:1 pistons on all rebuilds unless there was a good reason not too.
Are you in the process of rebuilding the engine? If so give consideration to the fact that previous head and block skimming will push CR above 9:1 if you use 9:1 new pistons without CCing the head and calculation it accurately.
Too much compression on these engines can be bad and make it very hard to time the engine properly without pinging.
We routinely used 8:1 pistons on all rebuilds unless there was a good reason not too.
Andrew.
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB. 1979 MGB.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB. 1979 MGB.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia
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