Strosek Ultra

Tuomo, the S4 throttle blade is 75mm, I just measured. This kind of butterfly throttle valve has to be slightly oval or it won´t close properly.
Åke

mark kibort

illl have to pull out my measurements, but that seems pretty small and maybe there is a way to widen it out?

cant we just take that AM V8 intake and cut off the legs and re-weld? (i dont know , just asking)

GregBBRD

During my "stock intake" R&D phase, I made several S4 throttle assemblies with 80mm, 81mm, and 82mm throttle blades.

BTW....these made zero change, on the dyno.....even though I flowed, ported, flowed, welded, ported, and flowed the entire lower assemblies.

I'm completely "lost" about the butterfly not being round, BTW.

mark kibort

I actually cringe posting that idea, knowing what i heard about the TB enlargements you made with mark's car. (with 0 gain)... kind of makes me think that the intake is THAT restrictive, no? Maybe you should take the intakes to the devek extrude hone guy...... (inside joke)

Just going to ask, as you have all the experience here. when you look at that Vantage intake, does lapping off the legs and widening them with welding new legs that fit the S4 heads, seem even remotely possible??? i just think since its aluminum, someone could weld something up to it, no??

Ducman82

this intake right?

barring any crazy angles its just time & money. the welding part is easy. but the fab/base work would be pretty consuming

ptuomov

If the bore is exactly round, exactly round butterflies get stuck. In an exactly round bore, you need to have a slightly elliptical butterfly such that it stops a tiny bit before it's perfectly normal to the bore. This prevents it from getting stuck.

ptuomov

The problem is that the the 928 4V engine has a big block dimensions and a low hoodline. The bore spacing of 122mm is not something you see in modern engines. It's actually quite difficult to make it all fit, and more stock components you try to retain (oil filler neck, MAF, air box, fuel rails, fuel pressure regulators, water bridge, etc.) the harder it gets.

I'm working on a turbo car, so I need the manifold to produce maximum torque at low rpms before the turbos spool and then distribute very high density air equally to cylinders at high rpms.

mark kibort

yep, thats the intake

i would think that its compact size would allow for all the stock fuel rails and lines, as well as use the stock oil filler and maybe route the TB to the rear .

i know im making it sound simple (not trying to really!), but it seems that spreading the legs out and making it fit the S4 big block dimensions, could be a real home run if it could be done

Vilhuer

You want to put intake made for 4.3L engine to 6.5L stroker? They make max 430ish hp even in 4.7L format. I would expect them to be too small for high hp 928 engine. I doubt there is enough material what can be removed to make them much better than stock 928 intake. In any case Aston engine is closely related to Jaguar V8. So it might pay to check what's done in them and Land Rovers which also use same design.

GregBBRD

OK. Wrong again.

I just thought that the ones I hand made in my lathe, for this purpose, were round.

GregBBRD

Truthfully, I'm so far down my own road, spending so much time trying to get the final patterns and pieces done for my own intake, that there just isn't time for me to look at how I could take something made for a completely different application, chop it up, and cobble it onto a 928 engine.

Has anyone priced an intake for a Vantage to see if buying one and chopping it up would be financially feasible? Are these intakes laying around somewhere in large numbers to make them super cheap to play with? I do know that the four basic pieces for a replacement intake for a GTS, from Porsche, cost $7500, today.

I can only imagine what an intake for a current day Aston Martin might cost.....

I'm just saying....while day dreaming about things is fun, if you've got nothing else to do....if the Vantage intake costs $7500 (or more) to start with....there might be more productive things to day dream about.

mark kibort

Heck, i know ! your path will be the right stuff. however, this is for the welder -dreamers out there that might have a way to make something a little different that might work a lot better than the stock intake. more bolt on, and less fabbing. i know its a dream, but heck, its only welding, right?

mark kibort

its very similar to the 5 liter intake that ford uses and they make 450rwhp with no mods other than chip and a set of headers. it will flow very well and will be a huge gainer for a 6.4 liter or a 5 liter. the aston also gets near 440rwhp with this intake, and does it with 4.7 liters and near 7700rpm. its mostly inake. cams for the 4.3 that gets near 350rwhp, are same lift as the GT cams, and the compression is 11:1, and pistons, rods all look like 928 stuff. actuallly, its not as optimal, as our S4 is much less stroke with a bigger diameter piston.
there is so much conjestion with the 928 S4 intake. proof by GB boring out the TB to 3.5" vs the 2.9" stock and seeing zero gains. when a "restrictor" plate doesnt do anything for HP, you have an intake problem!!!

V2Rocket

Check out intake manifold for Ferrari F40...sure is purdy...the design may fit under the hood of a 928, if not the actual part.

Adapting another car's manifold is the wrong approach...but using their design elements is the right track.

Imo000

Ok welder-dreamer, buy one of these intakes and commission someone to make it fit onto your engine......then report back. Stop asking others to make things for you on their time and money. As I said before, time to pay up or shut up. Anything is possible if you have enough money, time and talent. Since you clearly lack the last one, time to bring out the chequebook.