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Which Twin Hs4 Manifold

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#16 mailman

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Posted 29 October 2017 - 12:01 AM

Does anyone know whether the Maniflow twin SU manifolds retain the standard spacing so you can use their original linkages?
I clicked the link above and they are very nice, but they also look straight from carb to port (a good thing), but would that make the carbs further apart?

Spacing on the maniflow is exactly the same as the leyland manifold, so linkages and heatshield swap straight over.
It's worth noting though that I swapped from an internally modified leyland manifold to maniflow with no other changes and the mixture was completely wrong (there were no air leaks) and I had to fit richer needles, I hadn't expected the airflow to that much different that the fueling would be so far out.

Thanks Imack.

That's interesting information. Must really flow noticeably better. Do you have twin hs2 or hs4?

#17 imack

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Posted 29 October 2017 - 08:00 AM

Does anyone know whether the Maniflow twin SU manifolds retain the standard spacing so you can use their original linkages?
I clicked the link above and they are very nice, but they also look straight from carb to port (a good thing), but would that make the carbs further apart?

Spacing on the maniflow is exactly the same as the leyland manifold, so linkages and heatshield swap straight over.
It's worth noting though that I swapped from an internally modified leyland manifold to maniflow with no other changes and the mixture was completely wrong (there were no air leaks) and I had to fit richer needles, I hadn't expected the airflow to that much different that the fueling would be so far out.

Thanks Imack.
That's interesting information. Must really flow noticeably better. Do you have twin hs2 or hs4?

I've got twin hs4's on the large bore manifold, think there were two options for hs4 manifold, 1.4"bore at head and 1.5"at head, so you need to know your inlet port sizes.
The other thing to note is hat the maniflows don't have anywhere to mount the throttle cable,I welded a mount to mine to replicate the leyland set up.
There was also a recent thread on here regarding carb spacers - to fit or leave off. The maniflow without spacres is the same length as the leyland with spacers, I left them off mine.

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