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by **FST4RD** » Sun Sep 25, 2011 3:50 pm

Just thinking out loud again... been thinking about this for a bit.
Has anyone gotten hold of a V6 or 8, managed to swap the heads over so the exhaust exits into the middle and the intake is on the outside?
Reason I say this is that if this was the case you could run a dirty big high mount turbo right in the middle of the motor, then you would have 2 intake plenums, 1 for each bank.

I'm assuming it would be possible?
Anyone done it?

by **darkwolf** » Sun Sep 25, 2011 4:26 pm

BMW has in the new X6M and M5.

by **FST4RD** » Sun Sep 25, 2011 4:28 pm

I would have thought for a non turbo it would be pointless seeing as the exhaust would have to get up and over the engine and down either side.

by **RomanV** » Sun Sep 25, 2011 4:46 pm

FST4RD wrote:I would have thought for a non turbo it would be awesome seeing as the exhaust would have to have 8 fire belching pipes sticking out of the bonnet.

Fixed

by **holden_fan2005** » Sun Sep 25, 2011 6:06 pm

There is a rat/hotrod around somewhere with this type of setup. It is 100% awesome

by **ee904age** » Sun Sep 25, 2011 6:51 pm

Someone did it to a holden V6 in a stock car a few years back, used 2 l/h heads (or maybe 2 r/h?)

by **FST4RD** » Sun Sep 25, 2011 8:14 pm

I just think instead of a big supercharger sticking out the middle of your bonnet you could have a filthy big turbo :twisted:

by **fj40cruzapete** » Sun Sep 25, 2011 10:19 pm

ee904age wrote:Someone did it to a holden V6 in a stock car a few years back, used 2 l/h heads (or maybe 2 r/h?)

was on a toyota v8

is still racing in nelson will try find some pics of it

by **KinLoud** » Sun Sep 25, 2011 10:43 pm

This sort of swap is done frequently in Touring Car classes (BTCC, British Touring Car Champoinship).

They swap the head around so that the intake faces forward and exhaust points towards the bottom of the firewall (if it's not already like this)
They do this to reduce weight, lower centre of gravity and simplify air supply to the airbox/intake

The oil galleries, water galleries don't line up so they supply oil/water seperately rather than via the block.

They use custom cams for peak power and so its easy to arrange flanges for camwheels etc. at the correct end of the camshaft.

Ken

by **fj40cruzapete** » Sun Sep 25, 2011 10:48 pm

by **rollaholic** » Mon Sep 26, 2011 7:58 am

FST4RD wrote:I would have thought for a non turbo it would be pointless seeing as the exhaust would have to get up and over the engine and down either side.

who said anything about non turbo

i wonder if it would be easier to rearrange timing somehow, or the cams so that the inlet valves become the exhaust valves and vice versa.

whats the benefit supposed to be on that stock car? looks farkin messy

by **FST4RD** » Mon Sep 26, 2011 8:00 am

That's one cool V8!

by **Leon** » Mon Sep 26, 2011 8:12 am

what in the name of all that's holy ...

Looks like an explosion in a spaghetti factory.

by **Quint** » Mon Sep 26, 2011 8:46 am

wof guy: 'You have an exhaust leak'

*tear*

Santa's TardMe Listings · by **Santa'sBoostinSleigh** » Mon Sep 26, 2011 11:20 am

Quint wrote:wof guy: 'You have an exhaust leak'

*tear*

lol

by **FST4RD** » Mon Sep 26, 2011 11:47 am

Has anyone seen a V6/8 with both exhaust manifolds facing inwards?

by **Mr Revhead** » Mon Sep 26, 2011 1:19 pm

that's awesome in a special kind of way!

How about a V12?

Might be outside the budget you have in mind though

by **KinLoud** » Mon Sep 26, 2011 1:28 pm

fj40cruzapete - cool engine setup!

Running a flat plane crank? - I guess that setup makes it easier to pair up the correct cylinders for the exhaust manifold?

Ken

by **Lith** » Mon Sep 26, 2011 1:41 pm

KinLoud wrote:Running a flat plane crank? - I guess that setup makes it easier to pair up the correct cylinders for the exhaust manifold?

I think thats one of the advantages that BMW are exploiting with their new V8s, they run twin twin scroll turbos mounted between the banks - its still cross plane, but they can have alternating pulses fed into separate scrolls of each turbo so there is no pulse collision without needing to do huge exhaust manifold plumbing all around the block.

by **Guss** » Mon Sep 26, 2011 4:56 pm

more common on the Yank Diesel V8's. packaging would be an issue i'd imagine in anything you cant poke the exhaust directly out the back (or in a yank tank truck)
http://www.eng-tips.com/viewthread.cfm?qid=276231&page=9
has some informed views

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