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MPPE progress? 1800

uid 37336's pic
posted by  B20Paul. on  Tue Jul 31 04:19 CST 2007
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last visit: Mon Oct 20 10:54 CST 2014
[RELATED]

Do you remember the original BMC-Mini? To get them to get a big cam to work with twin SU's they used what was called a 'scatter pattern' cam. The lobe centres of the inner cylinders was different to the outers to help stop the inner & outer cylinders from robbing mixture when they were both pulling on the same SU.

They best example I have seen is:

Inlet 1 & 4 Lobe Centres = 104
Inlet 2 & 3 Lobe Centres = 98
Exhaust 1 & 4 Lobe Centres = 108
Exhaust 2 & 3 Lobe Centres = 102

The old Mini has a siamesed exhaust port for 2 & 3, not unlike the siamesed exhaust manifold on the B18/B20.

Can you use a B20 head gasket? It would be worth using a bigger inlet valve & taking the chamber out to 93mm long, then chamfer the bore adjacent to the inlet valve.






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New MPPE progress? [1800]
posted by  fidel  on Fri Jul 27 01:49 CST 2007 >


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