inlet manifold

[en035]

Here is the pic of the inlet manifold on my car,

Never touched it, what do you think, does it worth to get it machined?

Thanks

 

[martynh]

What car? 172, 182?

 

[en035]

sorry, 172 Mk1

 

[Ali]

Yes. Very worthwhile mod, good for 6-10bhp, depending on the serverity of the work required.

 

[wide]

the best way to tell, as far as i know is to put the gasket next to the inlet & see how much metal is showing. from your picture, there are markes around the inlet which look like an imprint of the gasket were it needs to be matched.i.e. waste meterial/metal. ben correct me if i'm wrong m8.

 

[en035]

gasket is already on top of it

 

[wide]

oh yeh lol, then its the amount of metal showing underneath the gasket!

 

[zack40]

so it's just a case off grinding the alloy thats visable?.on the top as shown and on the other side of the manifold 2?..then just polish the inside..

 

[wide]

its not something i would advise anyone doing if you haven't got experience, this is just a good indicator as to how well its been cast & if it needs doing!!!speak to benr @ AWT or nick @ Hillpower.

 

[bigsymo]

dude -
you will have to remove the inlet manifold!! the top of the inlet manifold is usually in keeping with the metal gasket and doesn't require that much work. the other end of the manifold will look totally different. each one of my holes needed enlarging by about 4-5mm to match the gasket. once it done you WILL notice the difference - mine feels like a totally different car!!

 

[BenR]

yup, it is the face of the maniflold which mates to the cylinder head which is the really bad part.

If you need one, just drop me a PM.

 

[en035]

thanks for offer, BenR. Unfortunately I am located in Turkey.

Thanks for the answers. If I can get it done in here, I will show you the pics.

Is there anything else that I need to give attention during machining?

While we were disassembling the components, I saw that the inner surface of the plenham was pretty rougher than that of lnlet manifold. Does it something we want?

Assuming we find some unmatched ports, while machining how deep should we extend this bore through the pipe, Should there be an angle?

Thanks for all the answers

Best

 

[caymanr26]

I know Ben matches the plenham as well - as you said it is pretty rough and poor quality so matching it is well worth while

 

[BenR]

Dont be too concerned with the texture of the ports in areas which you cannot reach, it is a very very minor detail.

The act of modificatons to the manifold is not one for a machine, unless you have a 5 axis cnc. Machining will leave a straight that is 90 deg to the manifold faces, which is a big no no. The point of modifying the manifold is to generate one continuous variable radii where the flow only 'sees' one runner with no joins.

The angle of entry into and out of each manifold component, and especially the head is of utmost importance.

 

[The Big Yin]

Ben im sure my inlet is plastic can this be machined too to release a few horses ?

 

[BenR]

If you have the K4M its basically a mini 172 engine, the top part is plastic, and the lower is metal. The metal part below can be modified no problem, and because the plastic is injection moulded, there is no problem with its dimentions as it uses rubber O ring seals instead of gaskets.

Get me a chassis code and i'll be better able to tell you exactly.