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Originally Posted by I16
Dumb question #1
Did the RS500 engine have a BD? designation.
# 2 is, did the Mountune normally aspirated engine use the same block etc.
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The RS 500 engine was known as the YBD, the Sierra Cosworth engine was known as the YB family.
YBA - Prototype of this engine.
YBB - 2 wheel drive Sierra Cosworth engine.
YBC - Group A version of the YBB.
YBD - RS500 road car engine.
YBE - Not used (In case someone called it Your Bloody Engine apparently!).
YBF - Group A RS500 engine.
And so on (All information from memory from the Graham Robson Cosworth book).
The n/a YB engines did use the standard block and cylinder head castings.
OK, it's time to put my Cosworth anorak back on and go for a lie down...