Cam

Would a tuned length inlet plenum with individual runners the same size (similar to an exhaust manifold in design) overcome the problems with getting completely equal charge distribution between every cylinder?
Here is a picture of a very serious quad GT47 blown V8 featuring such an intake.

Stavros

In a word.

Probably

I remember mentioning this many many many years ago, on the RSBB probably, asking why its rarely done.
But TBH its the room, or lack of generally.

Only seen it done a few times in the above style, mostly on V8s, but 1 4cyl too.

Cam

That isn't an issue (within reason)

I have a cunning plan!

Stavros

Dont forget too, its not just physical room for the pipes, but physical room to do up the fooking nuts that hold it on

I think its kinda one of those good ideas that are almost more trouble than they worth

Cheaper n easier to adjust the fueling per cyl than it is to make the airflow equal per cyl, even tho id much much much prefer equal airflow than trim the fueling as that seems like a mild bodge to me.

GARETH T

yes it would,,, the problem with tuned inlets is that they only work at one point in the rev/load range

very fancy looking thin though

GARETH T

did paul hills do those wastegate pipes?

Stavros

AROFL

I thought that when I first saw em a few weeks back

I take it the V8 runs such big boost the wastegates never actually open, so the Paul Hills signature skinny EGR ALS pipes dont need to be used to make the car blow up

Cam

I know how important tuned (and variable length) runners are on high revving N/A motors but a isn't a forced induction plenum more about equal and adequate flow charateristics to each cylinder? Would the "exhaust manifold in reverse" design not reduce each intake pulse interfering as much as on a regular "common tank" plenum design or would the shock waves have just as much or even more effect when they are further from the intake valve ?

Cam

I hope not as the bugger isn't CORGI registered

GARETH T

you are right,, the inlet pulse does have a lesser effect on a turbo engine!
can see what you mean now,, thay have just gone for equal length! alot of work,, for nearly 0 gains!

cossie4i+

iTrader: (15)

That engine is just mad

Steve.

Rick

i want that engine lol

Cam

Specifically I mean on an RB motor I asked the same question on the GTR Reg and got one decent answer with all the rest just getting a boner at the pic of the engine
All RB plenums suffer in varying amounts from unequal charge distribution (pot 6 esp runs lean) so I figured that the tubular approach would be a way to eliminate that and also allow for some other rejigging of the induction plumbing to try some ideas I have cooked up.

Anonymous

Ultimately you would need to experiment and test it.

Personally i suspect that intake will be less effective than a conventional plenum, but obviously if they have tried it and it works at the point in the rev range they want it to then they are probably going the right route.

I wouldnt advise just building something that looks similar and hope it works though TBH

Conventional plenum works really well, so i cant see the point in deviating from it that much.

Disabled Account

Actually, if you look at the pic, despite all that very nice inlet pipework, you can see that the whole lot appears to go into a collector box (just like a conventinal plenium), so would that not negate the effects or possible benifits of long tuned inlet tracts?

GARETH T

doug i dont think its a normal plunum,, i bet its the inlet tracks for carbs

reality

Apparently that engine made 4000hp..

Cam

not quite, it made 3904bhp

GARETH T

cam is that your new engine for that yank tank your getting?

Cam

I don't know what you mean

GARETH T

PMSL

foreigneRS

a decent tuner would then put EGT sensors in each runner when mapping it to make it either pot 6 runs correctly and pots 1 to 5 are slightly rich (if no cylinder trimming is available), or they would use the same technique to trim each cylinder individually if the management system is capable.

Porkie

iTrader: (1)

Pokey

Whats it for? Is it for those mad tractors? or has Rod finally decided for one last go at Topspeed Record

Cam

Thats how mine was done but a manifold that had equal distribution would mean that fine tuning individual cylinder trims wouldn't be required.

Cam

Its in a street legal and driven Camaro that was built by Mike Moran but is now owned by Jay Leno and its credited as the most powerful street driven car in the World

GARETH T

is there a car that jay leno dont own?

Cam

There is a vid kicking about on the net of his collection and its mad......from Brough Superior bikes to an original 60's Batmobile, every exotic you can name and enough military vehicles to invade Mexico!

_DAN_

I bet he doesn't have this is his garage.

GARETH T

ive seen a few photos of his garage,,, out of this world

i heard he thought he was the kiddy when he got his mclearn f1,,, drove it up his road,, and the guy next door has got one aswell

Cam

If nextdoor is the guy with the whining bitch from the Macca collection vid he should be neighbourly and mow the slut down with one of his tanks

GARETH T

totally agree

Anonymous

GARETH T

oh fuck off phil i bet your laughing