Inlet manifold Blueprinting

[BiggestNizzy]

Does anyone know the rover part numbers for the Gaskets that go between the plenukm and the manifold and the manifold and the head.

The Lotus part numbers I have are A111E6322S & A111E6323S

TIA

[steve_weegie]

What manifold do you have Nizzy? The plastic ones and the metal ones use different gaskets.

Cheers,

Steve

[BiggestNizzy]

I have a metal one now.

[steve_weegie]

Cool, here you go

LKJ100860 - Gasket-upper inlet manifold to lower inlet manifold
LKJ100821 - Gasket-inlet manifold to cylinder head

[BiggestNizzy]

[Rich H]

Do you haev an ail back deck or the plastic one?

[BiggestNizzy]

The car currently has a plastic inlet manifold but I am changing it to an Aluminium one

[Rich H]

No engine cover - placcy or Ali?

Just asked as the VVC inlet manifold fouls the ali back deck on my car - it's 'eased' itself over the years but worth considering!

[BiggestNizzy]

Ahhhhhh

I have the fibergalss one

[BiggestNizzy]

I am bluepringing my inlet manifold / plenum chamber.

Inspired by this http://www.alcester-racing-sevens.com/v ... ttling.htm

I have the gaskets and my plan was to make a direct copy of the gaskets in steel, case harden it and bolt it on this should give me an excellent guide for port matching the joins between the plenum and the manifold I will do something similar between the plenum and the throttle body

I understand that this is a long winded method and there are probably better methods (I did think about CNC machining them but work is so busy I get no time for homejobs )

Anyway when it comes to the join between the head and the manifold. the car is my every day runaround so I can't pull it apart and do something similar on the head. I have a sporrt 135 head on the car already so what can I assum it's like so that when the time comes it's a quick and easy bolt it on job

[steve_weegie]

Yup, i did something similar when i was rebuilding mine except i blued the head and manifold & ground away just enough to make them match.

The key is to take as little material away as possible & not to open both sides up to fully match the gasket. This will avoid a big baloon in the join where the air velocity will decrease.

FWIW, both halves of my plenum were far off each other & the head join wasnt much better.

[Rich H]

Similar here, just used a marker pen and opened it up by hand and eye. It's not hard to get right, ali cuts relatively quick but not uncontrollably.

[BiggestNizzy]

The key is to take as little material away as possible & not to open both sides up to fully match the gasket. This will avoid a big baloon in the join where the air velocity will decrease.

I was worried about that the head to manifold gasket is 39 dia with a small flat the plenum to manifold is 41 Diameter. The manifold has roughly 38 diameter bores my thinking was keep the head to manifold roughly the same with possibly a little smoothing if things look especially ropey but take the plenum-manifold almost all the way up to the gasket diameter as you won't get the ballooning effect.

At this point I would like to let you all know that my engineering backrounds means I work in sizes

[Rich H]

Sounds like a plan, I can't remember what I did... Pretty sure I just used the gasket as a template too.