sounds cool ;D

A diesel engine does not have a throttle opening it is constantly open, when you press the accelerator you feed in more fuel which increases the revs.

This is why diesel engines have alot more torque at low rpm than petrol because torque is the product of fast combustion.
(combustion being a chemical reaction of fuel and oxygen with compression or spark being the catalyst, the more oxygen molecules there are the faster the combustion reaction as the fuel has much more choice as to what to attach to).

Anyway a dump valve releases compressed air from the turbo when the throttle plate is closed to prevent the turbo spinning down between gear changes.

So as you can see it wouldnt work.

[quote author=stilosporting link=topic=129.msg429#msg429 date=1183653032]
when i took some pipes off to clean, im sure there was a throttle? ??? wish i had taken a picture now.
[/quote]

There would be a hole but no flap as such.

The throttle pedal regulates the fuel input, on a petrol car is regulates the air and fuel input.

[quote author=stilosporting link=topic=129.msg429#msg429 date=1183653032]
when i took some pipes off to clean, im sure there was a throttle? ??? wish i had taken a picture now.
[/quote]

There is a throttle which is actuated by a vacuum. When the engine is running this throttle will be open but when the engine is switched off it closes! It doesn't control the speed of the engine like in a petrol car (as Lowtech said). ;)

[quote author=DevastatingDaveDET link=topic=129.msg463#msg463 date=1183757027]
[quote author=stilosporting link=topic=129.msg429#msg429 date=1183653032]
when i took some pipes off to clean, im sure there was a throttle? ??? wish i had taken a picture now.
[/quote]

There is a throttle which is actuated by a vacuum. When the engine is running this throttle will be open but when the engine is switched off it closes! It doesn't control the speed of the engine like in a petrol car (as Lowtech said). ;)
[/quote]

Thanks, the pegeot diesel I worked on didnt have a flap. :o