inlet manifold

[laney1812]

anyone got options for inlet manifold..

apparently standard one isnt very good ive seen people say ..

im assuming it doesn't flow enough for good power increases... this is why people swap for FRP manifold however these are ridiculously exspensive..

i know of only one other option and that lightening Motorsports inlet manifold.. again not cheap..

does anyone know of other alternatives or anyone making their own improved manifolds maybe using first section on standard manifold and making a better plenum chamber onto it ??


or does anyone know if porting inlet manifold makes a good difference??

 

[Ginger Tom]

using first section on standard manifold and making a better plenum chamber onto it ??

This is basically what the lightning manifold is, the original first section with an enlarged plenum bolted to it.

Anything that smoothes the air flow, to a point, into the engine is good

 

[laney1812]

hmmm good sounds not to bad ... probobly something i could make myself then...

has anyone got good pictures of lightening motorsport manifold

 

[milburn7191]

same question from me, im thinking of fabricating my own manifold to include plenum chamber.

there was an old thread where a uni student designed one on CAD and made it for a uni project, i have emailed him but no reply.

Anyone want to enlighten the rest of us on the best way to incorparate a plenum into intake manifold?

 

[Ginger Tom]

LMS sell either a fibre glass manifold or a Ali one. Kizza when I come up to see you I'll do you a couple of drawings, I'll speak to you more about this when I see you next Friday.
In principle the plenum needs to be 10 litres, same as the FRP.
The member, tommo1990 iirc, had some good ideas but also some, to me, suspect ideas, if you read the thread you'll see I've voiced my concerns.
Another member, can't remember what their name is, used I think a vauxhall plenum. You'll have to search the forum for the info on that one.

The 1.7 inlet does have a plenum, though its a little small it is there.
The main way to fit a plenum is to...........you'll have to find that out yourselves, or I'll be making some up when I can get the proper tooling.

Anyone wants to talk more about this and in more depth go to gingertommotorsport.com for my contact details k:

 

[stumc]

10litres?! Iirc the general rule of thumb is something like 1.1/1.2:1 plenum:engine capacity. So a plenum capacity of around 1.9-2 litres for the 1.7 engine.

Would be relatively easy to do in mild steel with a mig welder but would need to be bolted to the std inlet lower. making the plenum from ally and then welding it to the lower would be better, just obviously not that many diy'ers can tig weld at home.

 

[milburn7191]

10L ... 12L ...12000L ... it doesnt matter if the distance from the valve to the end of the trumpet is too long or too short you will end up with less than 1bar behind the valve when it opens so the desired performance just wont be there.

you would be better stcking with the standard manifold rather than making a bespoke manifold with a 10+litre plenum and the wrong length pipework.


http://www.projectpuma.com/viewtopic.php?p=209519" onclick="window.open(this.href);return false;
this thread reakons 417.4107mm...would be good if someone could confirm this.

 

[Ginger Tom]

That's the bloke I was thinking about!!!

It all depends on where you want the power and if you want more torque or horsepower

 

[ally frp]

I had mine ported and polished by Raceline the duratec and zetec specialist. It had made the car smoother and sharper pickup.
This is a few pictures of the head port side






Middle section to plenum

 

[Ginger Tom]

I hope that's not too smooth, looks sweet tho

 

[ally frp]

I got my FRP manifold ported as well. They are absolute perfectionist which is what you want when you hand over your pride and joy.

Cheers

Ally

 

[ally frp]

Just another image I found.


Cheers

Ally

 

[pumad]

wow! real smashing good work there... i'm a two stroke tuner... but that's real hard work to get it like that

 

[laney1812]

wow think i might get my standard puma inlet ported and polished and get a mondeo tb ported and polished fitted to it aswell

 

[ally frp]

wow! real smashing good work there... i'm a two stroke tuner... but that's real hard work to get it like that

As we always say the work in real life is better than the photo's. He is a genius. Borderline on the insanity for the level of workmanship and attention to detail. He also done a 1.7 cylinder head for me as well to match. Had this work done about 6months ago. I first used him 10years ago when he done a black top 2.0 zetec head for me pushing out 220bhp N.A on standard valve sizes and was a work of art!

Cheers

Ally

 

[stumc]

that manifold looks good! how much was it? and how much was the head work out of curiosity?

I hope that's not too smooth, looks sweet tho

[off topic]
this is all pre injector so wont matter anyway, but i guess youre a believer of the mirror finish being bad rule too. i do wonder whether with modern day injectors it does even matter as much as it does on an engine running carbs? dont suppose anyone here has the answer to that?! i only mention it because ive always understood that to be the case but seen a few builds with really smooth ports that went on to make good power with no issues...
[/off topic]

 

[Ginger Tom]

It's not about carbs or injectors, it's about airflow. For a faster airflow you need a boundary layer which with a mirror finish you don't get

 

[ally frp]

head photos

gasket matched

 

[pumad]

oohh man! I want mine too be like this to..

very fine work!

 

[stumc]

It's not about carbs or injectors, it's about airflow. For a faster airflow you need a boundary layer which with a mirror finish you don't get

yeah i know what you mean, i did aerospace engineering at college and trying to remember a bit more about the fluid dynamics non-sense lol! im fairly sure regardless of the finish there will always still be a boundary layer, however the smoother the finish the more the boundary layer is 'stuck' to the sidewalls for want of a better description. having said that, i know the reason golf balls have the little dimples is to 'cach air to create a boundary layer. so i might be wrong. the whole theory of rougher inlet tracks post carb/injector is to induce a very small ammount of turbulence to agitate the air and stop the fuel from condensing on the walls of the port i think. i might be getting things wrong here and happy to be corrected but im fairly certain that the smoother the better for airflow.