Rover V8 twin inlet manifold?

[KKson]

I have never seen or heard of one of these before. Twin plenum - yes but inlets either side of the plenum? Bet it's a pig to get both throttles synced! Nothing to do with me but curious as to what it's off.

http://www.ebay.co.uk/itm/Rover-V8-twin-inlet-mani...

[gmw9666]

Lots of weird and wonderful plenums here http://www.mez.co.uk/ms12-new.html

[Boosted LS1]

^ My one's on that page, second from the bottom. TT 5.0 TR8 with chargecoolers. It had twin bolt on throttles and I used a top mounted central pivot to operate them. it worked very well.

[Wedg1e]

gmw9666 said:

Lots of weird and wonderful plenums here http://www.mez.co.uk/ms12-new.html

Cheeky bugger's pinched one of my pics: the first pic in 'Grafting on larger throttles' is one I made a few years ago, it's shown in the engine bay of my car...

[V8 Fettler]

Eight bike carbs! I wonder if anyone has fitted similar with a separate throttle cable for each carb. Synchronising would be fun, although could tune for individual cylinders.

[mrzigazaga]

I want one.

[rev-erend]

gmw9666 said:

Lots of weird and wonderful plenums here http://www.mez.co.uk/ms12-new.html

Mine is on there too..

[adam quantrill]

As I recall the twin plenum has both throttles off one long spindle through the lot - so it synchronises itself.

No - that's rubbish - there is a coupling with some adjustment - this is the best piccy I could find:



I guess you just set up the "closed" clearances to be the same on both throttles?

Edited by adam quantrill on Tuesday 26th May 18:49

[Wedg1e]

V8 Fettler said:

Eight bike carbs! I wonder if anyone has fitted similar with a separate throttle cable for each carb. Synchronising would be fun, although could tune for individual cylinders.

I don't see why you would? Bike carbs come in banks of four with linked adjustable spindles (rather like the arrangement shown on Adam's twin-throttle just above); tying both banks together with a linkage would be easy enough (in fact my Honda V4 does just that with two pairs rather than fours) - no need for 8 cables.

[stevoj]

KKson said:

I have never seen or heard of one of these before. Twin plenum - yes but inlets either side of the plenum? Bet it's a pig to get both throttles synced! Nothing to do with me but curious as to what it's off.

http://www.ebay.co.uk/itm/Rover-V8-twin-inlet-mani...

If you look at the internal picture, there seems to be a weld seem possibly meaning home made for what ever reason.

[Wedg1e]

KKson said:

I have never seen or heard of one of these before. Twin plenum - yes but inlets either side of the plenum? Bet it's a pig to get both throttles synced! Nothing to do with me but curious as to what it's off.

http://www.ebay.co.uk/itm/Rover-V8-twin-inlet-mani...

150 sheets? He's a bit optimistic. You could buy two scrap plenums (pleni?) and bung any competent welder £50 to join them up and have plenty left over. As for 'gives much more horsepower'... not by itself it won't. He's probably found that out the hard way and that's why he's selling

[V8 Fettler]

Wedg1e said:

V8 Fettler said:

Eight bike carbs! I wonder if anyone has fitted similar with a separate throttle cable for each carb. Synchronising would be fun, although could tune for individual cylinders.

I don't see why you would? Bike carbs come in banks of four with linked adjustable spindles (rather like the arrangement shown on Adam's twin-throttle just above); tying both banks together with a linkage would be easy enough (in fact my Honda V4 does just that with two pairs rather than fours) - no need for 8 cables.

Early Honda 750s and Triumph/BSA triples had separate cables to each carb. It's the challenge Wedg1e. But then why would you fit 8 bike carbs in the centre of the V with all the associated heat problems? No need, much simpler to fit fuel injection ... but not as interesting.

[Wedg1e]

V8 Fettler said:

Early Honda 750s and Triumph/BSA triples had separate cables to each carb. It's the challenge Wedg1e. But then why would you fit 8 bike carbs in the centre of the V with all the associated heat problems? No need, much simpler to fit fuel injection ... but not as interesting.

Didn't some of those bikes have the carbs poking out at jaunty angles though, so a common spindle would be out?

As you say, sometimes it's just for the challenge - hence my Jag throttle body mod.. I had to buy a TIG welder to do it, mind...

[carsy]

Wedg1e said:

Cheeky bugger's pinched one of my pics: the first pic in 'Grafting on larger throttles' is one I made a few years ago, it's shown in the engine bay of my car...

Did you gain anything with this. I`m pretty sure Phazed tried similar a while back and actually lost power.

[Wedg1e]

carsy said:

Did you gain anything with this. I`m pretty sure Phazed tried similar a while back and actually lost power.

Dunno, I never finished it. I was on a bit of a downer and decided to sell both my cars in 2006 (I had an Esprit as well); the Lotus sold first and then I changed my mind about selling the TVR but by then I'd started selling some of the bits and pieces, spares etc. for both cars and the modified plenum was one of the first bits to go.
There was still quite a bit to do to get it to work; there was no tapping for the distributor vac advance, the throttle cable would have had to be changed or modified, as far as I recall no idle air screw etc..

[V8 Fettler]

Wedg1e said:

V8 Fettler said:

Early Honda 750s and Triumph/BSA triples had separate cables to each carb. It's the challenge Wedg1e. But then why would you fit 8 bike carbs in the centre of the V with all the associated heat problems? No need, much simpler to fit fuel injection ... but not as interesting.

Didn't some of those bikes have the carbs poking out at jaunty angles though, so a common spindle would be out?

As you say, sometimes it's just for the challenge - hence my Jag throttle body mod.. I had to buy a TIG welder to do it, mind...

As I recall, the Honda had offset inlet tracts in the head, but used angled inlet rubbers to align the carbs. The Triumph would have been designed with whatever was at hand. It appears that this wonderful device had nine carbs with nine separate cables:



Ideal for going down to the shops.

[Boosted LS1]

What engines are those? I can't enlarge the pics, I didn't know honda made any two strokes.

[rev-erend]

They look like Kawasaki 500 or 750 engines.

[eesbad]

rev-erend said:

They look like Kawasaki 500 or 750 engines.

Yes, Kwaka 750 H2 engines, by the looks of it...

[Boosted LS1]

That's what I thought, maybe H2's could be H1's. I'm not that 'up' on kwacks. I've seen a 4 cylinder H2 before. That would have been a bit scarey, lol.

Edited by Boosted LS1 on Thursday 28th May 14:21