A Bit Of Theory For Discussion

[S2central.net]

Lee,

Do I understand that correctly... the twin cam (4 valve per chamber) Lancia engine had *diagonally* opposing inlet and exhaust valves ?

Now only the Italians could have thought of that - that is amazing. The complexity must have had some benefits for them to go those lengths and expense... Wow !


Paul

[Pisobiker]

and another one:

[Audi Parts Guru]

Originally posted by Lee
That unit had inlet and exhaust valves diagonally opposed right? Abslutely mental and a nightmare to get the plumbing installed. Theory was that swirling would be much better if diagonal ports were paired rather than the adjacent ones. Need to look up which engine it was but I am sure you're right with the Lancia unit! Inlet was above the engine and there were two exhaust amnifolds for the inline engine. I'll try to dig out a cutaway photo as I have one in a book somewhere on my bookshelf in work! What the hell are all my engine books doing in work!!

Lee, the car that you're talking about was planned to be the Group S car from Lancia, Group S being the replacement for Group B before it was banned at the end of 1986.
I have a book with this car in it and it's feckin mental oh to build a car like that

[Pisobiker]

and last one:

[MikQuattro]

Hehe...now this is getting interesting.... Can't wait to see where this is going to go....

Marco, I had a friend a while ago that was trying to tell me about that motor...that's amazing....:eek2: So how exactly does it work?

[Audi Parts Guru]

Right i'm off to find my book on Group B rallying :nana:

[Lee]

There was another special by someone during the Group B rally days which fed the intake charge between the cams and had 2 exhaust manifolds...I will look it up! It was MENTAL!

[Audi Parts Guru]

Found some links for you guys.................

here

and here

What would you do without me

[Lee]

Paul APG just mentioned the one I mean....Group S!! Didn't even remember that bit [the name]. Must have read about it over 10 years ago! Pictures tomorrow if I can find them!

@Paul N, I am not kidding aout the diagonally oppose valves....they were nutters looking for any advantage....mid 80's mind, imagine what they could do today with astronomical budgets and more modern materials such as MMCs, Beryllium, Ti, carbon etc (don't forget the computing software/power available today for CAD, CFD etc too)!

Dangerous in '85, what about 20 years on!?!?!

[martinjs]

i can recomend an excellent video..'the greatest years of rallying...the 80's'.
lost count of the times ive watched it. good footage of S1's also, mmmm

[Audi Parts Guru]

Originally posted by Lee
Dangerous in '85, what about 20 years on!?!?!

Lee, you up for building something interesting

[Lee]

Originally posted by Audi Parts Guru
Found some links for you guys.................

here

and here

What would you do without me

You beat me to it mate! Twin K26 on a 1.8 litre! What boost pressure were they running I wonder? Crazy developments! All carbon too! I guess this was shortly after McLaren pioneered CFRP in F1! That was the early '80s right?

I am sure that road cars would be a bit different today if that competitive nature and innovation was nurtured and given a marketing excuse for funding! Oh well!

[Lee]

Originally posted by Audi Parts Guru
Lee, you up for building something interesting

'Show me the money', in the immortal words of Gerry McGuire!!

[Pisobiker]

This thread is happily "flying" out of topic

[Lee]

I can have a habit of doing this (if it was my fault this time)! I am an administrator on RS246 so this probalby explains why I don't post very often these days...conflict of interest and all that (I'm meant to keep things sensible and monitor posts..which I do, but I have to bite my lip too often to prevent digression!)!

Good fun anyway but a pain in the **** to find topics later on in this forum! BTDT! LOL! I've been drinking anyway if an excuse is needed!