4 replies to this topic

[Joepotato99]

Does anyone please have any information on these Maniflow "Stage 2" LCN manifold and what difference they make?

https://www.minispor...arburettor.html


I have a recently rebuilt 1293, with Hif44, 1.5 rockers, and bigger valve (35mm/29mm) head. I have an RC40 exhaust and am looking to upgrade the manifold to a Maniflow.

Would I benefit at all from this Maniflow "Stage 2" LCB, or is the standard best? It's a £30 difference between the two.


Thanks,
Joe

[timmy850]

As per the description the stage 2 has a bigger exhaust pipe on the centre. As cylinders 2&3 share one port the larger pipe helps

[nicklouse]

Big is not always better.

 

what power are you expecting?

 

too big and you will be losing power as the gas velocity drops.

[Joepotato99]

Thanks guys, not too sure on power really, as much as possible for that setup! That's my concern really is whether that larger bore is excessive and will do more bad than good.

[Cooperman]

The larger bore one will work best at higher revs as only then will the exhaust gas velocity be correct.

It depends on how you intend to use the car. If it's for lots of high revs driving with maximum acceleration and you will regularly be needing to use, say, 6500 rpm, then a large bore will be better.

For using a rev range of 2500 to 5500, the smaller bore system will give best results.

As Nick says, it's a matter of optimum exhaust gas velocity. The big-bore system is intended for racing/rallying rather than for the road.