Nosi
I am planning to get some intake flanges cut by a local cnc mob. I found some files on the net that already have generated the patterns for various flanges, but I am confused !!!
there's a pattern for an ' 8 valve intake flange' but also a pattern for ' 8 valve with ears'
can someone please advise what the 'ears' are for ?
thanks
this was the link to the file-
http://forums.turbobricks.com/showthread.php?t=303053
Vee_Que
There are people who have them cut ready to go already. Why not go with them? Will be cheaper than the Australian rate.
Nosi
thanks, I couldn't find any for sale, so I figured I would do one for myself and sell a few to help reduce and offset the cost. if anyone knows where they are available, I would be interested.
Vee_Que
What is the intention? Custom manifold? You could cut down a stock one.
Nosi
ideally its for a custom stainless steel manifold. I will post full project details with photos in due course. cutting a standard alloy one is second choice only.
As I cant find any 'made to order' flanges, I figured getting a few made would be beneficial to myself and others on this forum. hence my original question as to the purpose of the ears.
I might pull the manifold off one of the cars today and see for myself what the ears thing is about.
Vee_Que
Stainless intake? No... You do aluminium intakes, stainless doesn't dissapate the heat.
But, why do you need a custom intake? Big turbo swap? Up to 400hp the stock manifolds flow without much issue, by then the head is a major restriction.
Samman88
Perhaps the ears are for fuel rail mounts? They are on the bottom I think so that doesn't really make sense.
@Vee_Que stainless intake saves you from buying a $2000 welder. And as for it conducting heat, there is no need for it to conduct heat well. That is what the intercooler does. My post intercooler IATs are like 45°c max. My engine bay is hotter than that, engine itself is hotter than that.
Stock intake manifolds are horrible with the slight exception of the b21/3 mani.
@Nosi I looked into making a frankenmanifold by cutting then milling down the stock mani to just above the injector bungs, then welding a cheap evo manifold onto them. Port spacings were abit off though, but might be worth considering if you can find a better spaced mani - civic maybe?
Vee_Que
Getting a hold of a person with an aluminium tig welder isn't that hard... seriously, plenty of places can do it.
That's an exaggeration to say the intake manifold is horrible, a b234 one has bad flow, but the b230 and b23 kjet ones are not horrific.
But once again, most importantly what are the goals for the motor?
Yoshifab sell a kit to weld onto a cut down manifold, there really are heaps of aluminium welders out there...
Considering your case sam, why bother spending effort and cost on your b230?
I've never seen a stainless steel intake on any engine I've dealt with in the last 10 years. No race engine runs one I've seen, no road car, truck or off road machinery. So to consider its use is interesting, as the heat dissipation vs aluminium to me would increase temps.
When is your iats checked? Out of interest? During a drive?
My intake manifold definitely gets hotter externally than 45degrees in normal daily use even with a big intercooler and phenolic spacers.
Samman88
I should clarify, depending on power goals the stock intake isn't bad and would be pretty responsive. Above 200kw there would be significant gains to be had with the increased plenum volume, larger runners and better/more even flow an aftermarket intake mani would offer. In my opinion atleast.
My IAT is datalogged. For sure, aluminum is more common as it is a better material to use (weight, cost, casting, working etc) but just trying to say that stainless could be used without much consequence.
Nosi
wow ! this popped up again after a while.
I have a set of 4 mikuni carbs and wanted to attach them to a b23, and still get them to fit under the bonnet ; which is a trick given the angle that the particular carbs like to sit. Hence a custom manifold. I have not progressed on the project at all, but figured the easy solution is a cut down manifold and add blue intake piping. reason for the project was to get a cheap multi-carb setup that was a replacement for k-jet.
might be a few more years before I can get on with this, unfortunately.
Vee_Que
Have you tried contacting redline? which particular mikunis? I'm sure there is a b230/23 weber dcoe manifold available, either redline or from Sweden..
jamesinc
Samman88;77718 wroteStock intake manifolds are horrible with the slight exception of the b21/3 mani.
They're not bad at all, but it is worth asking whether you'd rather take the time to port one, or take the time to fabricate a plenum like this:
Samman88
I guess when I say it is horrible I should qualify that statement.
- For intended use up to say 200kw there is no issue. Nice longish skinny runners for torquey tractor goodness, small plenum for good response and nice packaging.
- After a point (maybe 200kw?) there is a pretty large flow discrepancy between the outside 2 and inside 2 cylinders. Also, according to modern thought, the plenum is far too small for good top-end.
So I take it back, the blanket statement that the manifold is horrible was inaccurate. For performance applications it is suboptimal in theory.
Vee_Que
robv
Don't some Alfa's have stainless runners?
