Twin inlet manifold

pushmi-pullu · Jan 17, 2021

Hi all,

Any thoughts about the Fourby twin inlet manifold? I’m not sure about how much benefit you get for the £250 outlay.

Hicap phill · Jan 17, 2021

Add the cost of a larger intercooler

Cavey_P38 · Jan 17, 2021

Looks lovely and shiny, would be nice to look at when you occasionally have to pop the bonnet, not that you do that very often obviously.......LOL

pushmi-pullu · Jan 17, 2021

Hicap phill said:
Add the cost of a larger intercooler

I watched a YouTube video of a twin inlet install together with a large intercooler (Disco 2). The rad frame had to be cut together with the slam panel. They didn’t say how much the intercooler was, but it looked aluminium and expensive.
The video makers were raving about the mod and the benefit to torque. But for the outlay, I’m not sure about the benefit over standard.
With increased torque you will put pressure on other components also, won’t you?

Hicap phill · Jan 17, 2021

Have you still got the viscous fan on your engine? Or removed the cowl?

pushmi-pullu · Jan 17, 2021

Hi @Hicap phill
The YouTube video I watched, showed the re-install of the viscous fan and the cowling. I was wrong above, it was a Disco 1.

pushmi-pullu · Jan 17, 2021

Having done a bit more delving into this, the twin inlet manifold balances air flow across the pistons.
In standard format cylinder 3 gets the vast majority of cubic centimetres of air per minute (CCM), and piston 1 gets the least.
So in theory, the twin inlet manifold balances performance and delivers more air.

neilly · Jan 17, 2021

pushmi-pullu said:
Having done a bit more delving into this, the twin inlet manifold balances air flow across the pistons.
In standard format cylinder 3 gets the vast majority of cubic centimetres of air per minute (CCM), and piston 1 gets the least.
So in theory, the twin inlet manifold balances performance and delivers more air.

It makes the engine sound smoother when it is changed over on idle. Plus it feels smoother as you drive it.

it is all part of the ring/ pin/ IC and Hybrid turbo / increased Turbo pressure and FIP tune strategy.

Cheers

lynall · Jan 17, 2021

I would say it might benefit a naturally aspirated engine, but for a low revving turbo diesel not really.

Lewi112 · May 10, 2022

I dunno if these are still the popular thing , I’m looking into it currently , I have an idea how to check if there as good as forby say they are , involves a virtual wind tunnel / simulation I have acsess to I’m just working on getting a decent 3D model

Twin inlet manifold

pushmi-pullu

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Hicap phill

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Cavey_P38

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pushmi-pullu

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Hicap phill

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pushmi-pullu

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pushmi-pullu

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neilly

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lynall

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