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FE Technical Forum / Re: Effect of tight lashing and / or hydraulic lifters on a solid roller camshaft.
« on: October 21, 2024, 12:17:10 PM »
Here's some more exact numbers, regarding CR/DCR, for the info given, using a 8554 head gasket, of 12.7cc and 110 ICL, as well as a 1.11cc crevice volume:
CR of 10.28, DCR 7.89. 10.39 CR and 7.97 DCR w/o the crevice volume.
Depending on the real octane rating, that should be manageable. You can drop it a tenth with a .061 thick FT gasket.
If the ICL is installed to the cam card 106 ( ICL), that rises you to 8.16/8.24 with and w/o crevice vol.
But, if you might of advanced the cam, instead of retarding it 4° (102 ICL), that would put you up to 8.4/8.49
I think you should check the ICL and the IVC, to see where you actually are.
CR of 10.28, DCR 7.89. 10.39 CR and 7.97 DCR w/o the crevice volume.
Depending on the real octane rating, that should be manageable. You can drop it a tenth with a .061 thick FT gasket.
If the ICL is installed to the cam card 106 ( ICL), that rises you to 8.16/8.24 with and w/o crevice vol.
But, if you might of advanced the cam, instead of retarding it 4° (102 ICL), that would put you up to 8.4/8.49
I think you should check the ICL and the IVC, to see where you actually are.