Duratec and throttle bodies

[dibbly]

Hi all,

I'm after a bit of advice if anyone can help.

Whilst gathering bits for my new build a while back, I bought a complete 40mm (118mm long) DCOE-style  Jenvey set-up for a zetec along with an Omex ECU and loom, all for a very good price on fleabay. The intention was to fit this to a 2litre zetec/MT75 and all would be good

Now my kit has arrived and the Duratec bug has bitten me

I figured it'd only be a matter of time before I found myself wanting to fit one, so I'm guessing it will work out cheaper to do it at the beginning.

So, having sourced a suitable 2.0 engine, I'm wondering if my throttle body set-up is any use. I realise I'll need to re-map the ECU, Mod/replace the loom and get a suitable manifold, but I've noticed that nearly all the tuners use 45mm direct-to-head TBs and unfortunately my budget won't stretch to them.

So, what do you think? Will it work and what do you think the compromises will be?

Any help much appreciated

Cheers

[stu999]

To be honest, they will probably be ideal for an otherwise standard engine, especially if you dont plan serious upgrades in the near future.

To put it in perspective, a 40mm bodie has a 40mm hole all of the way through them - far more efficient air flow wise than a 45 Weber, with for example a 38mm choke in - which would probably be good for an engine with around 180+bhp. It will also be slightly easier to map the ECU at low throttle which will help with drivability/emissions compared to a 45mm body.

HTH Stu.

[conibear]

Be a shame to strangle a standard engine capable of producing circa 200bhp  

[dibbly]

Will the engine be strangled on these then if its just a std engine?

Are the 45s required to meet the magic 190-200Bhp or are they there for later upgrades?

Cheers for the help so far

[corsechris]

From the Jenvey site....

"Basic references for BHP per cylinder, assuming ca 120mm from butterfly to valve head and a max of 9,000 rpm are;

Up to 30 - 30mm, up to 33 - 32mm, up to 39 - 35mm, up to 46 - 38mm, up to 51 - 40mm, up to 56 - 42mm

Up to 65 - 45mm, up to 74 - 48mm, up to 80 - 50mm, up to 87 - 52mm, up to 93 - 54mm.

These power figures may be increased by up to 10% in a purpose - designed and well proportioned system.

As butterfly to valve distance increases, butterfly size will need to increase in proportion to system taper and vice versa.

Lower revving engines and those with injectors placed before the butterfly will generally accept a larger body."

So according to them, a 40mm TB will be good for up to 51bhp per cylinder. Give or take. I guess they would know.

HTH