Inlet Manifold Design

Duk
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Re: Inlet Manifold Design

Post by Duk » Wed Apr 19, 2017 5:26 pm

Dual length manifolds so seem more common on engines with fixed camshaft timing.
But Toyota did use interlinked dual plenum chambers on some of its 6 cylinder engines, both straight 6 and V6 without any form of variable cam timing. And there was that Nissan engine I posted a pic at the very beginning of the thread.
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Murray
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Re: Inlet Manifold Design

Post by Murray » Thu Apr 20, 2017 12:52 pm

Yeah I still have a weakness for the first Ford Taurus SHO engine engineered by Yamaha.
I had an 89 and it was an early application of variable length intake runners.Worked extremely well.Don't believe there was any camshaft timing trickery involved.
1986-GTV6
1989-75 Twinspark very sadly sold-remarkable sedan !
2014 Audi Q5 3.0l TDI - torque MONSTER
Duk
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Re: Inlet Manifold Design

Post by Duk » Fri Apr 21, 2017 7:22 pm

It seems like the Porsche Varioram is probably the most devoted variable harmonics inlet manifold. It uses 3 different stages of dual length and divided plenum chambers. Long runners/divided plenums, short runners/divided plenums and short runners joined plenums.
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105gta.
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Re: Inlet Manifold Design

Post by 105gta. » Fri Apr 21, 2017 11:46 pm

The 360 Fezza works the same. Dependent on revs and throttle position.
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Re: Inlet Manifold Design

Post by Duk » Sat Apr 22, 2017 8:28 pm

The Ferrari F360 manifolds only have 2 different states not 3 like the Porsche system.
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Re: Inlet Manifold Design

Post by 105gta. » Sun Apr 23, 2017 12:31 am

The 360 has long runners, short runners and a valve between the two plenums that either joins the Two to make 1 large plenum or when closed keeps them separated.
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