Pushing the limits of a BMC A series head - max effort circuit race

[KnightEngines]

How much less hp will an engine with dual SU carbs give?

Erland

No idea!
All the ones I've dealt with have run a Weber.

Split Weber or single on a manifold with bends?

Single, splits may happen down the track, or maybe a pair of mikuni HSR42 flat slides.

[BLSTIC]

Cool! I was hoping something relevant to grandad's Morris 1000 was going to show up :p

Got a few questions:

How big are those exhaust ports? And how does that relate to stock size? What header do you plan on using?

Is that combustion chamber shape better for combustion or was it mainly about flow?

And what do you think of using a thread adapter to run modern longer reach spark plugs? Is there much point? Would they hurt flow? Or would them being closer to the direct path of mixture somehow mess things up?

Thanks
Ben

[KnightEngines]

Cool! I was hoping something relevant to grandad's Morris 1000 was going to show up :p

Got a few questions:

How big are those exhaust ports? And how does that relate to stock size? What header do you plan on using?

Is that combustion chamber shape better for combustion or was it mainly about flow?

And what do you think of using a thread adapter to run modern longer reach spark plugs? Is there much point? Would they hurt flow? Or would them being closer to the direct path of mixture somehow mess things up?

Thanks
Ben

Ex ports are bigger than stock, but not heaps bigger, just enough to get a nice taper.
Chamber is about flow & pressure recovery, but it'll burn pretty nice as well.
A longer plug would probably get smacked by the pistons!
Pics don't really convey size, but the chambers are small & not that deep!