I recived a plenum that I ordered from Spencer Ashley.

manifold


When I bought it he did say it needed a little finishing off so gave me a few quid off. But I noticed last night that none of the tubes inside the chamber have been cut flush is that right?



inside manifold

that is sh1t, send it back, you might make 7bhp if your lucky using that

I have first year Apprentice's that would and make a better job of that. I would send that back and ask for my money back.

this is why i'm thinking of making my own version and selling them...... just need to get dxf's for the crossflow and zetec inlet manifolds.

I was just thinking the same thing but I have read some where that the is a science for gaining the maxium BHP from the inlet. If anybody has the measurements for something like this please u2u me.

that is shockingly bad (like my spelling) that and the griffin type inlets manifold should be easy to fabricate to a decent standard and with a bit of engineering thought even by fabricating the outer tube in two parts to enable some form of inlet runner incorperating a trumpet, i fabricated mine with a fiberglass plenum. as for inlet design think main areas are length for peak rev's trumpet for flow, getting to deep to look at pulse tuning and think that would be OTT





[Edited on 5/11/10 by will121]

I didn't think that seemed right.
I can't see it being to hard to make a better job. I could take some measurements off this if that would help someone to make one.
I payed £150 for this thinking that would be cheaper way to get my car running.

If you could take some for me that would be good.

i'd like a copy of the measurements as well please (and some photos).

cheers.

Yep its crap

What about getting together and getting one cast ?

There is a firm doing one for the x flow, and cosworth amongst others do one for the duratec.

I can take some dimensions of mine ?

looks pretty small? i thought the rule of thumb was 'twice the capacity of your engine' ?

Is it steel or ally?
Those welds look attrocious!

I'd want a lot more discount or a refund!!

any pics of the injector side? what does he do for the injector mounting?

presumably they are left like that to try and 'mimick' velocity stacks.

Link

Why would people want the measurements if they think the design is cr*p?

quote:

---

Originally posted by interestedparty
Why would people want the measurements if they think the design is cr*p?

---

Do we have pics from the injector side and measurements?

Sorry I left it at work and I'm not back till Monday. I'll take pictures then.

surely the runners need a radius on the end for good airflow?? That would help a fair bit I suspect, though make fabrication harder. Even the old Triumph PI (remember those?) had trumpets inside the plenium. Then again that system was developed by Lucas for F1 cars back in the early 60's so probably had a large budget, even then.
The runner lengths should be failry easy to work out, the jenvey site has some figures for v. high revving motors and a rule of thumb calculation for others max rpm's.
However all this is surely governed buy available space and budgets

Image deleted by owner


Image deleted by owner


Image deleted by owner

[Edited on 7/11/10 by big_wasa]

What fuel rail and injectors is that?

the rail looks like 8 valve 2.0 vauxhall engine (20seh)

no idea what the injectors are!

That first one is a proper shocker!

I havnt bought one, I just asked for detailed pics to gauge fitting and that was all I needed to keep my money.

Injectors are the standard end fed bosch type as fitted to the black top zetec. As for fuel rail I dont know what that one is from but the black top one could be used just fine.

I plan on making another after xmas. I was thinking of using a cosi Tb to make the idle controle valve easier.

So overall this plenum is not good? I am thinking to make one because the ones i see on the net are cheap or not that cheap as this one, but crap, ooor those aluminum round beautiful shiny 400-500 GBP ones, that are obvuously not my type of beer. and 175gbp is not cheap at all i think for 2 flanges and 5 tubes badly welded together. Please correct me if i am wrong.
Thanks
Yavor

If you can weld beter than this guy and put it together with a bit more care you should be able to make one for around £50 inclueding a lazer cut flange.

That doesnt allow for welding/ time and finish, just the steel.

I'm certainly looking for a plenum. There's a market out there. C'mon you engineering types!

i've been threatening this for a while, figured out everything including the injector bungs. Suppose i need to pull my finger out. Just need the cad diagrams for the zetec (and for personal use, crossflow, pinto is also an option) inlet manifold.

With the jig i've got in mind i can alter the height of the large tube per inlet so that it clears the chassis rails.

Good on yer MikeR - go for it!

Hey, MattyC, how about giving it to you apprentices as a project?

Should I do it myself, I wonder? After all, I did teach Frank Spencer everything he knew about precision engineering & welding. Maybe not, then!

Anybody seen this, btw

http://topspeedperformance.net/

Any use?

" MattyC, how about giving it to you apprentices as a project?" if someone comes up with the drawings i will!! a nice shiney 316L stainless one!!!

OK Here is some more pictures

injectorseats


manifold


manifold

And here are some measurements.


diagram

The small tubes outer circumference is 165mm and the large tube outer circumference is 240mm. Is there any other pictures or measurements that would help?

I spoke to Spencer Ashley today and he said he would give me my money back but that oes leave me without a manifold!

This any help? Don't know how good a unit it is power-wise

http://www.griffinpower.co.uk/html/drawings.htm

quote:

---

Originally posted by big_wasa
If you can weld beter than this guy and put it together with a bit more care you should be able to make one for around £50 inclueding a lazer cut flange.

That doesnt allow for welding/ time and finish, just the steel.

---

Brilliant!

I liked the look of this one

http://topspeedperformance.net/

Probably useless, but looks nice! Needs to fit under the bonnet of a 7 without great holes having to be cut out.

My thoughts so far....









Cast plenum top, trumpets, shown on duratec flange but you get the idea.

Any comments? Aside from not having any injectors shown yet.

Will need some refinement yet mind.....

Oh yeah and there's no tb mount yet lol

oooo maaan this looks awsome... i love it. I saw in some places that there are some like the jenvey one that can be disassembled. What good can this do - better servising, revising..?
One more time - i love this one that you have drown.

[Edited on 9/11/10 by i_froloshki]

I know practically nothing about plenum design, but I do know it's a lot more difficult that it looks, and it's easy to end up with something that looks good but has really poor performance. Also they have to resist considerable vacuum, when the throttle closes, which is why a lot of them are round.

Yes its nothing to get excited about just yet, I plan to run some cfd on it next as its just a guess at the mo.

Type 'inlet plenum design' into google & you get more info & pics than you can shake a stick at.

Here's just one result

http://www.google.co.uk/images?hl=en&biw=796&bih=458&q=inlet+plenum+design&um=1&ie=UTF-8&source=univ&ei=73fZTNKNONCNjAfNi4 yQCg&sa=X&oi=image_result_group&ct=title&resnum=2&ved=0CCgQsAQwAQ

Haven't Westfield got a design also?

That looks really nice but like others say looks aren't everything. Would that be expensive to make?

quote:

---

Originally posted by turnipfarmer

Haven't Westfield got a design also?

---

re "That looks really nice but like others say looks aren't everything. Would that be expensive to make?"

Not sure which one you were looking at - there are about 300 on that page!
You're right though - looks sure aint everything, and as for cost... no idea!

I only included that link because I thought you might see a design that looked halfway suitable, & you could then click the link to the mfrs website to see of there was any technical info.

This any help?

http://horsepowercalculators.net/intake-manifold-design/intake-manifold-design

Looks interesting