The 2 bagel intake manifold.

[AMD IS THE BEST]

Awesome work Fred. Looks great!

[M2cupcar]

I like the design Fred- good template for me to copy! Though I'm going to skip the bagels. And use aluminum.

[SAdrmmr04]

wow, i really like the work you've put into it! and now i understand the bagel part lol

[ragincanadian4]

Wow, pretty wild, looks good.

[shwine617]

I'll get the cream cheese...looks great!

[fredio54]

Thanks everyone. if doing this yourself watch out for shrinkage between the bagels when you weld em. caught me out (oldest trick in the book, but i forgot) and the plate ended up banana shaped and the ports didnt line up.

if the job market works out well in the UK as i expect it will, i will buy a tig there and start making ally stuff. i'll chuck a link into my sig and thread to where ever the project pics reside. probably a 325 running on toluene/gas :-)

if i mod it at all... might be hard to resist.

fred.

[anarchyx34]

Looks more like 4 bagels to me

[tyler886]

Its 2 bagels cut in half!

You're the man Fred.

-Tyler

[bleedsblue0023]

Fred,

Even though it says I am a newb I have been on a formula car team for a few years. The two Intake Plenums that I helped design, Finite element analyze, and flowbench for a turbo 600 F4I were funnel shaped velocity stacks attached to a sloped plenum to ensure equal air velocity and pressure.

Why would you have the plenum part of the manifold angled rather than curved, and the "bagels" pushing 1/2 the air to the outside of the mani & half in rather than funneling all the air into the chamber?

Kyle

[Karaha]

mmmmmmmmmm, steel bagels.

That is awesome work.

[fredio54]

if you look at how air flows into the end of a plain cut pipe under suction, you will see that a portion (not insignificant) comes from behind the pipe rather than in front. the normal thing to do is use a logarithmic/parabolic (i forget which) curve for the funnel, and to have a small bump before the backing plate to allow it to suck from behind also. unfortunately i dont have time or resource to make funnels, and associated small bumps. hence i said that its "pretty good" but not "perfect" (in my eyes).

i also believe that the air is drawn into the cylinder even when under pressure (atmospheric is just pressure after all) and that although the turbo is blowing and the air has velocity and energy, as long as the plenum is big enough, its just being filled by the throttle, and having "gulps" taken out of it at regular intervals by the engine.

also any velocity that is hitting the backing plate on the far half of the donuts will quickly be reverted by the backing plate.

hope that explains my reasoning.

thanks to those others who commented.

fred.

[TR-mx6]

I don't get it at all, care to explain the use of this intake? thx

[neogenesis2004]

Its going on a turbo motor....any motor for that matter can benefit from more efficient air travel into the runners. A good IM can increase CFM into a cylinder upwards of 30+ alone.

[fredio54]

what he said, and of course, a fwd one wouldnt fit on a rhd car.

[n2o_matt]

Originally Posted by bleedsblue0023

Fred,

Even though it says I am a newb I have been on a formula car team for a few years. The two Intake Plenums that I helped design, Finite element analyze, and flowbench for a turbo 600 F4I were funnel shaped velocity stacks attached to a sloped plenum to ensure equal air velocity and pressure.

Kyle

sorry for the o/t question, but i can't pm him for some reason

Just out of curiosity, what kind of formula car team were you on using an F4I? FSAE?