Is heat fitting rimmed liners in an aluminum block, mainly the rover 3.9, absolutly necessary. I understand that many aluminum race engines here in the states use rimmed liners that are not heat fitted. Is this necessary only for straight liners or both?
Thanks,
Tim
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Heat fitting rimmed liners in 3.9?
Moderator: Micka
Steel liners and aluminium "aluminum" blocks have a different rate of expansion, so as the block gets hot the hole ID gets bigger quicker than the OD of the sleeve. If you could press in a cold sleeve in a cold block , by the time they were at operating temp the sleeve would be flopping around.
So they heat the block to 100C and put in a cold sleeve so that when the sleeve heats to the same temp as the block it has a tight interference fit.
AFAIK it makes no difference falnged or otherwise. the flange means the head gasket bears on the flange , so even if the block has a leak it goes nowhere.
Regards Philip A
So they heat the block to 100C and put in a cold sleeve so that when the sleeve heats to the same temp as the block it has a tight interference fit.
AFAIK it makes no difference falnged or otherwise. the flange means the head gasket bears on the flange , so even if the block has a leak it goes nowhere.
Regards Philip A
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