Triple webers on a 3000m

[tvrmallorca]

A few questions is that I want to put on triple webers but worried about the air intake.....is it best to have them from the side or if from the top do you need to do a bonnet adjustment so the filters can breathe?

[DavidY]

It's not just the carbs that need to breathe, to see any 'real' benefit you will need a high flow fuel pump and a decent exhaust manifold and system. The standard TVR system is restrictive and you will not get much benefit (other than points on your credit card at the filling station) if you don't improve the manifolds/exhaust system.

GAjon is your man on this forum. I started this project many years ago, changed the exhaust, gained an instant hp increase with a 40DFI, everything worked so well, that after a conversation with Adrian@, I decided not to upgrade to the triple webers, and sold them and the manifold on. You will only really see the benefit of the triple webers at the top end of the rev range.

[Slow M]

In adition to the above, to make use of that induction system, you would also want to make the appropriate changes to cylinder heads and camshaft. Then, seeing as you would be spending more time in the upper part of the rev range, you would probably build-in some safety, by upgrading pistons and connecting rods. After that, you might want to look at possible upgrades to the oiling system.

I'm not sure if the stock clutch would endure, with the resulting increased torque loads.

I'm not (at all) trying to dissuade you, merely pointing out that the real benefit is in a holistic approach to upgrades; I.e. drive it like it is, and develop a budget. Once you have the funds, pull the trigger.

Best,
B.

[RCK974X]

I agree with above.

If you're doing it just for the look, then fine, but it won't develop that much more power, and it will likely use more petrol.

For proper power tuning, the trick is to identify where the airflow restrictions are, as it's (almost) always easy to get more fuel in, but hard to get the air in and out quickly.

For 'ordinary' pushrod engines like the Essex, it's commonly the head(s) and manifolds first, cam second, and then carburation third, but it does vary according to the detail design of the engine.

[tvrmallorca]

ok the idea is to change the inlet and exhaust manifolds. Put the exhausts from 6-2-1 to individual 3-1.

Engine is already tweaked to 213BHP on a dyno. so I'm just trying to work out the induction side....good point on the fuel pump!!! the car will be used to do road rallies as well as keeping it to road legal.

So do I need to modify the bonnet or do triples fit? with a bit of huff and puffing

[GAjon]

Getting good airfilters under the bonnet is a problem, I had to make do with the sock type on my first set of tripple webbers.
The second set of webbers I had sat on a further modified inlet manifold which sat the carbs higher up, so I didnt run any filters on the car at all.

My car has the two front ducts and the SE inlet at the top of the bonnet near the wind screen, which even if not scientific must help with getting air in and out better than the completely closed bonnets of later UK cars.

All the good stuff has been said about this mod being more use on an already developed engine, and as David said, the exhaust and exhaust manifolds are a must to get any benefit.

My engine was already in quite a heavy state of tune when I got my first Tripple Webber set up, but in truth I got them because I liked the look of the triple trumpets.

I tried (or should say Ric Wood tried) a ducted side air inlet on an injection plenum set up, it produced power on the dyno, but on the car it was flat so got dumped for triple throttle bodies and back to sock filters.

ETA, I've now modified my new bonet to give some extra clearance over the intakes.

[lee2cossies]

We use a Holley 4 barrel carb and swaymar inlet on our car which produces good results, as mentioned above the triples are only worth doing with most major component uprated. A mate of mine has triples on his Capri and their good but a pain to keep set up correctly and fuelling is single figures when u use it hard! Look awesome tho!

[tvrmallorca]

thanks guys, so i think its triple webers with trumpets and a bit of mesh to stop rubbish falling in. got to love this forum

[jim3000s]

Another alternative is to fit Jenvey DCNF throttle bodies, available in 40, 42 & 45mm.

Regards.
Jim

[chassyman]

hi, i would just like to give you some information to consider. the trumpets atop the carbs come in various lengths, so if you have a mind to use the shorter ones as a way to go, beware with that cam you have you will get a lot of what is called stand off, where the fuel sprays a fine mist come vapour out the top of the carbs due to valve overlap. in racing i've seen undersides of bonnets soaking wet. scarry!!!!!!! just make sure you fit a filter king fuel regulator and set it about 3 to 3.5 lbs no more. a holly set up is about 7lbs or so. no body has mentioned carburretor roar from webers, is there a better sound? best regards keith

[tvrmallorca]

Ok so the update is the bonnet will be modified to make sure the webers fit....now the ultimate question is anyone know of places to buy the triple webers and inlet manifold from that are reasonable. I saw on eBay one for £2600 which seams pretty expensive.