cl350rr
Well-Known Member
- Joined
- Jun 23, 2009
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- 198
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I have spent most of the winter in search of compression on my Odds and Ends engine with minimal success. I have now produced 4 different sets of iron rings for it and the last set are about as good as I will be able to do. I installed them and tried the engine and the compression is better than any I have tried before but is still insufficient for the engine to run.
my method of testing the rings is with the valve block and spark plug removed and finger over the ports. this eliminates leakage from these parts for the time being and only leaves the piston to bore seal.
I did not make the cylinder so I am not sure what material it is made out of but I assume cast iron and have no reason to believe it is anything else. I checked the bore and it is straight and round. I tried honing it with a brake hone and that improved compression slightly but not enough.
the question is: what surface prep is recommended in a 1" bore cylinder for running an aluminum piston and iron rings?
do the rings need to break in like on a larger engine or are you guys pollishing the ring and cylinder with laps to create the seal?
thanks
my method of testing the rings is with the valve block and spark plug removed and finger over the ports. this eliminates leakage from these parts for the time being and only leaves the piston to bore seal.
I did not make the cylinder so I am not sure what material it is made out of but I assume cast iron and have no reason to believe it is anything else. I checked the bore and it is straight and round. I tried honing it with a brake hone and that improved compression slightly but not enough.
the question is: what surface prep is recommended in a 1" bore cylinder for running an aluminum piston and iron rings?
do the rings need to break in like on a larger engine or are you guys pollishing the ring and cylinder with laps to create the seal?
thanks