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PostPosted: Fri Apr 30, 2021 7:16 pm 
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Location: County Durham.
To put this in some context.

I have a 1.3ltr Escort FWD OHV engine.
My original plan was to put a carb on it and throw it in the Festival.
I may still do that.
But thought of the idea of running injection on the engine.
Drilling 4 holes in the underside of the inlet manifold and mounting the injectors there.
Using a fuel blanked off carburettor body as the throttle body.
The idea to keep it looking factory unless you take a good hard look.

So.
As the original question.
Could a carb be used as a throttle body if I blank off the fuel ways?

Thanks.

Jason.


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PostPosted: Sat May 01, 2021 9:12 am 
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It would work. No idea on how it would effect performance, but a 1.3OHV doesnt exactly blow you away to begin with.
Guess you'd need to chuck a TPS on, think about idle control. A quick google and it looks like the Americans have done it quite a lot

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PostPosted: Tue May 04, 2021 5:19 am 
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Location: County Durham.
Ok..

Thanks.

Jason.


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PostPosted: Mon Jul 26, 2021 8:27 am 
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haz87 wrote:
A quick google and it looks like the Americans have done it quite a lot


"built with pride in the US"? Oh dear.


Simple answer is: no. It might work, but never properly and it will ALWAYS be a pain in the arse. Carbs work totally different than injection systems do.

What kind of injection did you plan to use? You'll need a mappable aftermarket one which is expensive. For less money you'd get a whole CVH EFI or Zetec unit for your car. Makes sense.

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PostPosted: Mon Jul 26, 2021 11:21 am 
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Jason wrote:
To put this in some context.

I have a 1.3ltr Escort FWD OHV engine.
My original plan was to put a carb on it and throw it in the Festival.
I may still do that.
But thought of the idea of running injection on the engine.
Drilling 4 holes in the underside of the inlet manifold and mounting the injectors there.
Using a fuel blanked off carburettor body as the throttle body.
The idea to keep it looking factory unless you take a good hard look.

So.
As the original question.
Could a carb be used as a throttle body if I blank off the fuel ways?

Thanks.

Jason.


Anything is possible. Off the top of my head potential downsides.

Depending on how you manage the graft the TPS on there could be slack in the carb linkage that could result in tps accuracy issues and to avoid more wires youll want to use tps/rpm mapping which is where the head ache would lay.
Idle control wise no different to any other aftermarket system with no idle valve. You open the throttle enough for a good idle cold then let the ECU pull spark timing to control the idle hot. Works really well especially on older engines that dont have big alternators and AC compressors.
As long as the injectors are pointing broadly down the port and not too far away from the port you shouldnt have manifold wetting issues that makes transient throttle a challenge to calibrate. If you end up with an injector in the carb area that could be a issue but you dont want to do that anyway.
Keeping that carb looking engine bay with all the added wiring of EFI might be hard but not impossible.
Youll need to gut the dissy so it doesnt interfere with the spark advance that the ecu is trying to do.
then just need a crank sensor.

again nothing impossible but might be easier to put a throttle body on top of the carb manifold and modify the air filter box to fit the throttle body.

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PostPosted: Sat Jul 31, 2021 7:58 pm 
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Location: County Durham.
Thanks for that.
I was looking at fitting the injectors from the underside.
So far from ideal due to the angle as you said.

The dizzy and wiring I wasn't worried about.

I'll look into it all.

Thanks.

Jason.


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PostPosted: Mon Aug 02, 2021 8:39 am 
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Jason wrote:
Thanks for that.
I was looking at fitting the injectors from the underside.
So far from ideal due to the angle as you said.

The dizzy and wiring I wasn't worried about.

I'll look into it all.

Thanks.

Jason.


The injector angle should be ok, you may have to have a rich transient as the fuel pool may not be that constant. It wont be great for emissions but compared to a carb it will be almost a tesla.

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PostPosted: Mon Aug 02, 2021 12:55 pm 
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Joined: Fri May 23, 2003 11:04 pm
Posts: 22273
Location: County Durham.
I had a look at the manifold I was looking at using.
I could 'almost' fit the injectors horizontal in it.
It has a steep step near the port. So depending on the length and size of the injectors, should allow for a shallow angle.l

Jason.


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