2139 replies to this topic

[siztenboots]

not from Jim I hope

[rob999]

Six month lead time isn’t bad 🙄

[Arno]

Do any OEM's use a twin inlet port rather than a siamesed port? I've seen it on aftermarkets or exotic race heads but it doesn't seem to be adopted.

Has been done in some form like Vauxhall/GM used it on their twin-port engines in the Corsa's and the like.

 

Usually have to 'cheat' a little though as they tend to want to use a single injector, so often the two runners do share a single injector in case of a traditional port-injection setup using a section where the two runners have a shared 'raised roof' section. (direct injected engines like some of the CDTI's do have 8 intake ports on the head)

 

Toyota (and others) have used manifolds in the past with separate runners, often with butterflies/valves in 1 runner to increase air velocity at low load in the 'open' port/channel in the manifold (eg. TVIS system on 3SG(T)E engines).

 

Mostly done for fuel economy by OEMs at part-load to increase air velocities in the intake port and improve air-fuel mix in the combustion chamber.

 

Honda's VTEC-E system on the more eco-based engines does a similar thing by keeping 1 of the intake valves closed during part-load (so running it as a 12V engine) and switching to 16V mode in higher load conditions. This gives the same general result but does away with complicated manifold constructions with 8 runners or extra flaps.

 

Bye, Arno.

[The Batman]

 

 

some lovely valves

 

 

 

balancer delete and new z4 oil pump

 

 

 

engine looking like an engine now!! 

 

 

 

 

 

balancer delete and new z4 oil pump

 

 

 

[gaffer1986]

Looks so clean!

[The Batman]

Yeah! All been blasted and bolts been replated

[rob999]

Is it in yet?

[The Batman]

Na, hit a bit of a hiccup with the sump not fitting the latest spec pump so getting a new sump

Waiting on modified cam cover aswell

[Aerodynamic]

What kind of modification on cam cover?

 

Na, hit a bit of a hiccup with the sump not fitting the latest spec pump so getting a new sump

Waiting on modified cam cover aswell

 

[Aerodynamic]

Is your cam chain top giud updated? I know I bought a longer (wider) version of this for my Engine

This is to prevent any jumping change atleast on the camgears.

 

If you want I can see if I still have this partnumber somewhere.

[The Batman]

Chains where genuine honda parts

 

Cam cover is having extra 2 breathers fitted to it

[Nev]

Some chav has got into your garage and painted the bolts green!

[The Batman]

He’s trying to slow me down to his level

[Aerodynamic]

Not the chain the chain guid over the cam gears. There is a geniune later honda but its longer.
Do you want the part number?

Chains where genuine honda parts

Cam cover is having extra 2 breathers fitted to it

[The Batman]

yes please bud

 

i take it, it is a worthwhile mod?

[CHILL Gone DUTCH]

along with the rotrex

[The Batman]

If i bought another rotrex then it would be sold like the last one... baby is destroying everything already.

[Aerodynamic]

I thought I had the part number stored but cant find it. But I Think it´s the one used on the later Type R FN2 (k20z4) seen below.

Called cam chan guid B.

 

cost aroud 20 usd

 

https://www.ebay.co....A-/302878015343

 

https://www.hybrid-r...ine-build-guide

 

 

yes please bud

 

i take it, it is a worthwhile mod?

 

[rob999]

Is it finished yet?

[The Batman]

Still waiting for the sump