Gain 100HP with an intake manifold change?? - Cross post from Ferrari Chat
#676
Former Sponsor
so a sleeve that fits in the 968 lower manifold section?
I think it woud be great to use the 968 lower section because the injection mount is already there. vs taking a blank, like Obehave's and have to fab up that part as well. If the 968 is aluminum, it seems that it could be cut and then a connecting tube welded to fit to the aMV8 intake. carls wouldnt work as its plastic, and the only option there would be for hose clamps and tubes. doesnt look like there is the room or angles to make that work
I think it woud be great to use the 968 lower section because the injection mount is already there. vs taking a blank, like Obehave's and have to fab up that part as well. If the 968 is aluminum, it seems that it could be cut and then a connecting tube welded to fit to the aMV8 intake. carls wouldnt work as its plastic, and the only option there would be for hose clamps and tubes. doesnt look like there is the room or angles to make that work
#677
Rennlist Member
shussshhhh!!! im trying to suck a few advisors in!
Hey, but its good for the discussion and its got to make you curious as to the possibility of it working, right??
thats a good idea... kind of bursting my bubble though.
Ill have to see what that plennum looks like .
edit: thats nasty.. that wouldnt work and would be a TON of work to make fit. better to just adapt the legs of the S2 intake to the AM V8. i really think that is the way!
what is Han's intake stubs? something like what car made... Obehave's aluminum lower manifold was just the plate. the injector holes and tubes need to be welded on.
I know this is a long shot, but it could work! no?
this mounted to that via some welding!
Hey, but its good for the discussion and its got to make you curious as to the possibility of it working, right??
Again...I wouldn't waste my (your) time with the AM intake.
I've tried to adapt "other car" stuff to my projects before...it never works out.
Just remember what it looks like...but come up with your own design to fit the 928.
A pair of S2 runner-sets with a common plenum would probably do good.
in the S2 (3.0L) the car makes 208hp at ~6000rpm and ~200tq at 4000rpm.
I've tried to adapt "other car" stuff to my projects before...it never works out.
Just remember what it looks like...but come up with your own design to fit the 928.
A pair of S2 runner-sets with a common plenum would probably do good.
in the S2 (3.0L) the car makes 208hp at ~6000rpm and ~200tq at 4000rpm.
Ill have to see what that plennum looks like .
edit: thats nasty.. that wouldnt work and would be a TON of work to make fit. better to just adapt the legs of the S2 intake to the AM V8. i really think that is the way!
what is Han's intake stubs? something like what car made... Obehave's aluminum lower manifold was just the plate. the injector holes and tubes need to be welded on.
I know this is a long shot, but it could work! no?
this mounted to that via some welding!
Last edited by mark kibort; 04-13-2016 at 08:33 PM.
#678
I'm going to say No, until one is sitting on top of an engine so one can actually get sizing info. the bends could be to extreme and make the whole "benefits" prospect disappear
#679
Chronic Tool Dropper
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Mark-- dreaming of how to fit a pair of 4 cylinder intake manifolds to the 928 ignores the fact that each half of the 928 is a pair of uneven-firing 4 cylinder engines. The A-M manifold is a compromise where it bunches the uneven-firing cylinders together in each side of the plenum, still a lot of improvement available if you have the space. There's a lot of "crosstalk" between the cylinders, particularly noticeable when they are bunched like this. Two runners need to circle back on each side. The manifold runners and plenums could as easily be segregated front to rear as side to side.
#680
Rennlist Member
Mark-- dreaming of how to fit a pair of 4 cylinder heads to the 928 ignores the fact that each half of the 928 is a pair of uneven-firing 4 cylinder engines. The A-M manifold is a compromise where it bunches the uneven-firing cylinders together in each side of the plenum, still a lot of improvement available if you have the space. There's a lot of "crosstalk" between the cylinders, particularly noticeable when they are bunched like this. Two runners need to circle back on each side. The manifold runners and plenums could as easily be segregated front to rear as side to side.
are you refering too if we could use two 4 cylinder intake mounted to a single box. that isnt what i would ever attempt.... i hold the AM V8 intake in high regard and think if it can be adapted it will provide sizable gains.
From what you are saying, firing order-wise, it might not be optimal, but many of these "integrated" intakes are not optimal. what it loses in optimization , it gains in flow restriction reduction as proved by what it does to a little 4.3 liter v8, keeping more of its hp over a wider RPM range than even the 928 intake!
As greg says, and notices, the ports are huge and are narrow down to the proper size to fit the 928. im sure it will work, if the "joiners" will not be a mess to construct.
#681
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I don't know if this was brought up somewhere in the past 46 pages, but did Adam ever finish his intake using BMW M5 horns?
https://rennlist.com/forums/928-foru...ake-horns.html
Rich
https://rennlist.com/forums/928-foru...ake-horns.html
Rich
#682
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Åke
Last edited by Strosek Ultra; 04-14-2016 at 05:09 AM.
#683
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2-stroke engines use a tuned exhaust that accomplishes essentially the same thing.
Insane power across a very narrow rev band.
I know snowmobile racers who do some amazing stuff. They get the engine/pipe combo dialed in, and then work over the clutch/CVT combo so that the engine is revving "just right" no matter what the speed the machine is going.
These are mostly "Ice Drag Racers".
They are really fast.
Insane power across a very narrow rev band.
I know snowmobile racers who do some amazing stuff. They get the engine/pipe combo dialed in, and then work over the clutch/CVT combo so that the engine is revving "just right" no matter what the speed the machine is going.
These are mostly "Ice Drag Racers".
They are really fast.
Åke
#684
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The bore of the Aston Martin V8 4.3 is 89mm. One can assume the C-C between the cylinders will be less than 100mm. For the 928 it is 122mm. For the AM manifold the two center ports will be min. 11mm off center, the two outer port more than 33mm. That is huge. Not mentioning the distance across the block, between the cylinder banks.
Åke
Åke
Last edited by Strosek Ultra; 04-14-2016 at 05:09 AM.
#685
Captain Obvious
Super User
Super User
I had a Yamaha RZ500 (2stroke, V4, street legal race bike). When the exhaust port power valve openned the front end went skywards. The huge rush of power made it a twitchy bike to handle. You had to be aware where the RPM was or it would scare the crap out of you. Yamaha had to make enough of them for street use so they can race them. It's a collector bike now, should have kept it.
#686
Rennlist Member
shussshhhh!!! im trying to suck a few advisors in!
Hey, but its good for the discussion and its got to make you curious as to the possibility of it working, right??
thats a good idea... kind of bursting my bubble though.
Ill have to see what that plennum looks like .
edit: thats nasty.. that wouldnt work and would be a TON of work to make fit. better to just adapt the legs of the S2 intake to the AM V8. i really think that is the way!
what is Han's intake stubs? something like what car made... Obehave's aluminum lower manifold was just the plate. the injector holes and tubes need to be welded on.
I know this is a long shot, but it could work! no?
this mounted to that via some welding!
Hey, but its good for the discussion and its got to make you curious as to the possibility of it working, right??
thats a good idea... kind of bursting my bubble though.
Ill have to see what that plennum looks like .
edit: thats nasty.. that wouldnt work and would be a TON of work to make fit. better to just adapt the legs of the S2 intake to the AM V8. i really think that is the way!
what is Han's intake stubs? something like what car made... Obehave's aluminum lower manifold was just the plate. the injector holes and tubes need to be welded on.
I know this is a long shot, but it could work! no?
this mounted to that via some welding!
#687
Chronic Tool Dropper
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i dont understand.. we are talking the AMv8 intake, mounted to the 928.
are you refering too if we could use two 4 cylinder intake mounted to a single box. that isnt what i would ever attempt.... i hold the AM V8 intake in high regard and think if it can be adapted it will provide sizable gains.
From what you are saying, firing order-wise, it might not be optimal, but many of these "integrated" intakes are not optimal. what it loses in optimization , it gains in flow restriction reduction as proved by what it does to a little 4.3 liter v8, keeping more of its hp over a wider RPM range than even the 928 intake!
As greg says, and notices, the ports are huge and are narrow down to the proper size to fit the 928. im sure it will work, if the "joiners" will not be a mess to construct.
are you refering too if we could use two 4 cylinder intake mounted to a single box. that isnt what i would ever attempt.... i hold the AM V8 intake in high regard and think if it can be adapted it will provide sizable gains.
From what you are saying, firing order-wise, it might not be optimal, but many of these "integrated" intakes are not optimal. what it loses in optimization , it gains in flow restriction reduction as proved by what it does to a little 4.3 liter v8, keeping more of its hp over a wider RPM range than even the 928 intake!
As greg says, and notices, the ports are huge and are narrow down to the proper size to fit the 928. im sure it will work, if the "joiners" will not be a mess to construct.
#688
Former Sponsor
The bore of the Aston Martin V8 4.3 is 89mm. One can assume the C-C between the cylinders will be less than 100mm. For the 928 it is 122mm. For the AM manifold the two center ports will be min. 11mm off center, the two outer port more than 33mm. That is huge. Not mentioning the distance across the block, between the cylinder banks.
Åke
Åke
A 1"+ change in port location with 1" of available space is nothing, when you are day dreaming.
Damn near a bolt on....
#689
Rennlist Member
HANS has the part!! forgot about those!
so this is the way! how much for a set of those? sems much easier than adapting the 944S2 runners and welding on them, but maybe not. yours are a clean slate and all we need is a tube from that to the AMV8 runner
I had a Yamaha RZ500 (2stroke, V4, street legal race bike). When the exhaust port power valve openned the front end went skywards. The huge rush of power made it a twitchy bike to handle. You had to be aware where the RPM was or it would scare the crap out of you. Yamaha had to make enough of them for street use so they can race them. It's a collector bike now, should have kept it.
The bore of the Aston Martin V8 4.3 is 89mm. One can assume the C-C between the cylinders will be less than 100mm. For the 928 it is 122mm. For the AM manifold the two center ports will be min. 11mm off center, the two outer port more than 33mm. That is huge. Not mentioning the distance across the block, between the cylinder banks.
Åke
Åke
The Kawasaki 500 triple, a very scary bike, I never figured out how to keep the front wheel on the ground. That "one-wheeler" was a killing machine. However the BMW R69S of mine, modified to 750cc, race cam, 36mm carbs, ported heads with much larger 42mm intake valves, outperformed both the Kawasaki 500 and the Kawasaki 750 Triples two-strokers. The year was 1969 maybe 1970 and I had been porting cylinder heads for myself and friends for a number of years. Unbelievable how time flies. Did not get the flow bench, which was a good help to optimize the porting jobs, until in the early 80´s.
Åke
Åke