mark kibort

In pusute of more power out of he 928 stroker, or probably out of the 5 liter engines as well, and all the success we have seen with a myriad of custom intake manfolds, (from 50 to 100hp without much tuning or changes) i planning to build up a Aston Martin based intake manifold for the 928S4.

In simple terms, im taking the Aston Martin intake, and cutting off its legs, and adapting it to the 928 manifold adapters. (with welding or hard rubber mounts)
the entire length of the foot print of the AM intake is 12" vs the 928 S4 intake being around 13". i think that 1" shared by each runner, is doable to adapt to the custom manifold adapters made by a few on this list. I almost bought the last adapter, but wasn't committed as i am now to try and make this project a reality.

based on the success of this style of manifold on the 5liter, 4.6liter mustang and the 4.3 and 4.7 Vantage V8s, i think the gains should be substantial. these motors , easily make near 400-500hp with similar cam profiles, valve sizes and displacements to our 928S4s

the plan is to make it all as stock as possible, with little or no changes to the fuel lines and only a re-position of the intake to be rear mounted with a custom airbox, or front mounted with a single throttle body, using the stock throttle cable system (sans the lower pulley)

I think its a beautifully designed intake and if the mating to the custom manifold adapter is possible (and i think it looks that way) it will be a HECK of a lot easier than the effort made to make these from scratch. PLUS, this is proven technology. albeit for another engine, but with similar flow characteristics.

thoughts?

Mongo

If it clears the hood, yay!

Mongo

What is the diameter of the runners at the port for the AM intake?

mark kibort

preliminary mesurements say it will

all i need is these two gems ...... well, a little more than that.. but its a start

mark kibort

I think i measured it near the same size as the S4.. even the "D" shape is similar.

Ill check my notes from last year when i was working on it.

Hopefully, Hans will make another run or share the drawings for a fee.

Mongo

Mark, take a look at the Boss Mustang 290 intake. Very similar design to the Aston Martin. If the ports match on both intakes, it would be cheaper to buy and chop a Mustang intake up than an Aston.

mark kibort

I did... and they are very similar in many ways. they are making HUGE power out of the 302ci/5 liter. (440rwhp is common with only minor tweaks.) the problem is that is made of plastic you can buy the aston intakes for under $500....
I figure with the aluminum, we can have more flexibility to weld stuff to it.
right?

rjtw

Hey Mark,
Care to venture any opinion on whether these intakes could be fit, and would benefit, the older 16V engines like in my US spec '83? Love your roll-up-your-sleeves attitude. Watching with interest!
Cheers,
Rick

mark kibort

I think so.. but, the question is all about the port spacing and width. also with the US 4.7, for which i have a ton of experience modifying, it responded well for headers and exhaust (20 solid hp) and then with the intake ( hand port matched U, throttlebody, and plenum (with the euro 80 cam) it was able to generate 35 more HP. we did this several times with the same results, but you have to to most all of these mods. I assume with just the cams and the AM intake if it could be made to fit, would give significant gains. the 928 is pretty heavily restricted as far as its intake in almost all years.

Mongo

Didn't know they were plastic on the Mustangs. The new intake will need to be plumbed for the brake booster and ISV vacuum.

dr bob

Do It! Post progress pictures as you move along.

V2Rocket

ever since you first mentioned possibly grafting the AM intake to a 928 i've been struggling trying to justify hacking up a $1000+ manifold just to start, where you could DIY your own complete intake using the AM one as a "guide" for less than that.

not to mention the 928 intake probably has probably an inch wider bore spacing than the AM motor

but its your money...

mark kibort

as a guide? have you seen the details of the AM intake? you have seen how many HOURS greg and others have spent on making these things with tubular welding, etc. . its a TON of work. the AM intake is tuned, correct, and perfect, all but for one issue........ the intake port spacing.. however, its only an inch over all 4 cylinders.. so, we only need to angle the runners to the feet, by 1" over 13" , or each foot centerline , needs to move about .25". i think its doable. and they are not $1000 parts... there are several for less than 500bucks... ask greg which is harder, makng one or adapting one.

mark kibort

I think that could be easily adapted with welding ports on the intake. there is already a few bungs there. the throttle body could be the stock 85-86 version, but i havent looked that far yet.. most important is the foot spacing and as you say, the ISV and the vacuum port for the brake.

James Bailey

Actually Mark the runners for 1 and 4 must move the full inch.....or 1/2 inch for each. !!