GregBBRD

Han's intake stubs to AM manifold?

mark kibort

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!

Ducman82

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

dr bob

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.

mark kibort

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.

Richard S

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

Strosek Ultra

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

Strosek Ultra

Four-strokers with tuned intake and exhaust usually work over a much broader rpm range than two-strokers.
Åke

Strosek Ultra

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

Imo000

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.

hans14914

dr bob

So what was your discussion about with adapting the 968 manifolds? It -was- for a 928 application, right?

GregBBRD

You worry way too much about reality.

A 1"+ change in port location with 1" of available space is nothing, when you are day dreaming.

Damn near a bolt on....

mark kibort

its 1" over the entire intake, so i guess it looks like .5" per runner , wider. I dont know how difficult it will be ... YOU should have the grasp of that for sure, especially with your crazy turns and bends of artwork for your headers. i would think this would be childs play for you.... now, i have to find your welder!

not really.. i was just thinking of ;lapping off the lower manifold, not the manifold themselves.. that was suggested but would be a disaster.

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

its crazy! the kawi 500 was a beast. not as much power as the 750 triple, but ligther. like i said, ive never been so scared on the road. even to this day!

actually, it looks as though the total distance each runner will be off is .5" per runner last runner per side comparison, total is 2" off (56mm), this is divided by each runner. im probably going to get the AM intake and then mock up something

there is that wide bad HP discussion .. exactly right... that HP peak was up in the 17,000rpm and was very narrow! be in the wrong gear and it acted like a CB100 honda!

i never figured that out either.. thats why ive never been more scared on the road before! WOT= wheelie! ... thats when i downgraded to a GPZ500. so tame!!

mark kibort

do they fit the stock fuel rails?