down draft throttle bodies as opposed to side draft

[wildo105e]

Had a wine induced brain wave whilst thinking about throttle bodies for my lotus twin cam. The current dellorto's are pretty close to the inner wing and the rear bulkhead. so my first thought is shorter TB's but then the light bulb came on with 4 right angled adapters i could use down draft TB's this would give me the space to get a large panel filter which is solely missing at the mo. This is only in the thinking stages but would there be any performance gain/loss using down draft on adapters.

Ford successfully did it with the RS2000 on IDF carbs but most still use dcoes rather than the IDF carbs although this may be down to cost etc.

Just food for thought but any opinions appreciated. I don't want blow some money etc if it is a dumb idea.

cheers

[ugg10]

Are you going to keep the injectors in the bodies, with the zetec/duratec etc. The OEM injectors in the head would not be too upset by an if style to, but with the injectors in the bodies I think you may get wash out of the fuel on the outside of the bend compounded by the injectors pointing at the bend not into the ports. If you had a manifold made the injectors could be kept pointing at the inlet ports but the butterflies point up after the bend. Iirc the later bmw bike bodies do not have injectors in them. Or use something like these - http://www.ebay.co.uk/itm/4-Cylinder...0AAOSwNSxVSE52


These me are not cheap but look interesting and can be bolted to a stock carb idf manifold.http://www.ebay.co.uk/itm/THROTTLE-B...IAAOSw-kdXx9gq

A call to Dan st engineering may be useful as he seems to be able to knock up ally manifold for most things, bogg bros also may be worth contacting.

[Dyno]

Successfully at the RS2000 ??? It was not so big success. The IDF, compared to the DCOE was eating a lot of extra horses. The turn into the manifold was not so wanted.

[ugg10]

The alternative is to go for a log plenum and single throttle body, http://www.pepperperformance.com/rwd...lenum-chamber/

Or here

http://www.kitspares.co.uk/index.php...product_id=628

Ginetta also used then on the g20 racers.

not it that pretty but could be made so.

[wildo105e]

The turn into the manifold was not so wanted.

Think that about sums my plan, as that is what i would have introduced it was only an idea anyhow. side drafts seem the way forward.

[alladdin]

custom manifold at 45 deg angle ? best of both worlds.........

[katana]

I think the idea has some mileage in it! Just use the TB's for airflow control and mount the injectors horizontally in the bend? I think the downdraft IDE's suffered having to flow a fuel mixture, injectors as above shouldn't be an issue? Those Aussie pieces are nice. I've the same problem in my 'scort - fitted a zetec and decent manifold and the TB's are too tight to inner wing and bulkhead to get any filter on so was thinking of 90 deg. bent ram pipes and plate filter over - then the damn struct brace is in the way - problems, problems!

[Miniliteman]

Successfully at the RS2000 ??? It was not so big success. The IDF, compared to the DCOE was eating a lot of extra horses. The turn into the manifold was not so wanted.

Not my experience, IDF's produce good bhp.
It's the construction of the airfilter-housing that eats alot of horsepower, upto 18 depending on cam.

[Dyno]

IDF do make good power but not on a Pinto. Or not as good as side draft Webers on a Pinto. I don't think you can see 190 Bhp on 2x IDF on a Pinto.

[Miniliteman]

Maybe not as good as a sidedraft setup.
But have seen 202 bhp on a 2.1 Pinto with 48IDF's on a Schenk dyno.

[Dyno]

202 Bhp is a lot of power for any Pinto. I would be surprised to find this on DCOE. I can never say it's impossible but it sound a lot to me.

[wildo105e]

TB's are too tight to inner wing and bulkhead to get any filter on so was thinking of 90 deg. bent ram pipes and plate filter over - then the damn struct brace is in the way - problems, problems!

think i may also run into that issue aswell after another look today

[avtospotter]

Not my experience, IDF's produce good bhp.
It's the construction of the airfilter-housing that eats alot of horsepower, upto 18 depending on cam.

hey Miniliteman! I thought it would be worth asking for your opinion on this as im not very smart engine-wise;
is there any specific cam type recommended for a IDF setup? I Have 1.6 mk2 mexico/ capri gt pinto (the 1600 pinto with bigger valves and 2 litre camshaft) and it came with a sweet pair of 40's IDF. I am trying to think ahead for when I want to see a little bit more power, which way to go? would appreciate your thought on this

[avtospotter]

Not my experience, IDF's produce good bhp.
It's the construction of the airfilter-housing that eats alot of horsepower, upto 18 depending on cam.

hey Miniliteman! I thought it would be worth asking for your opinion on this as im not very smart engine-wise;
is there any specific cam type recommended for a IDF setup? I Have 1.6 mk2 mexico/ capri gt pinto (the 1600 pinto with bigger valves and 2 litre camshaft) and it came with a sweet pair of 40's IDF. I am trying to think ahead for when I want to see a little bit more power, which way to go? would appreciate your thought on this

[Miniliteman]

Hello,
for a 1600 with 40IDF's I would say use a Erson 134 cam.
Similar cam is sold by Piper and Burton.

[avtospotter]

Hello,
for a 1600 with 40IDF's I would say use a Erson 134 cam.
Similar cam is sold by Piper and Burton.

Thank you, I will look them up
I hope you don't mind If I come back later in the future with more questions
cheers