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intake trace on a 4 stroke turbo diesel
intake trace on a 4 stroke turbo diesel
hi, ive attached a file of the intake pulses on a 2.2l tdci ford puma engine..it was obtained by taking the pressure transducer readings from the pipe between the intercooler outlet and the throttle body / manifold inlet.. the trace appears good and clearly defined ...the engine was running at 800rpm and the max pressure on the traces appear to coincide with a manifold boost pressure of between half and three quarter of 1psi...ive used phase rulers etc but still not sure what the various features on the trace represent in terms of valve operation etc.. is anyone able to interperate this..
i used a current clamp on no1 injector as a reference..
any help appreciated..
i used a current clamp on no1 injector as a reference..
any help appreciated..
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- inlet manifold pressure, no1 cyl firing ref.psdata
- intake trace
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wiki38andy
- TwoWaves
- Posts: 84
- Joined: Sat Apr 18, 2020 4:45 pm
Re: intake trace on a 4 stroke turbo diesel
Here you are my explanation. Any question is welcome.
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Re: intake trace on a 4 stroke turbo diesel
Thanks for the reply andy.. Sorry for the delay.. I will be back with any questions when I get a chance to have another look..
Re: intake trace on a 4 stroke turbo diesel
I struggled with this trace so thanks again for your input..
Am I right in thinking that the inlet valve that opens where you have indicated, then closes around the top of the following pulse.. As indicated between the two rules I've placed on this picture.. I think that would make a valve opening time of approx 230deg and also overlap the opening of another inlet valve...
Am I right in thinking that the inlet valve that opens where you have indicated, then closes around the top of the following pulse.. As indicated between the two rules I've placed on this picture.. I think that would make a valve opening time of approx 230deg and also overlap the opening of another inlet valve...
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wiki38andy
- TwoWaves
- Posts: 84
- Joined: Sat Apr 18, 2020 4:45 pm
Re: intake trace on a 4 stroke turbo diesel
On petrol engines, INT valves close quite retarded, between 40*and 60* after BDC. As they usually have VVT, INT camshaft can be advanced up to 45*(under heavy load), and so, lot of overlap. On diesel ones, INT valves close between 20* and 35*(usually) after BDC. Fixed value for the whole range of engine speed/load. I did not see any overlap on these engine by now. EXH valves close 10*-!5* before TDC and INT ones open 0*-10* after TDC.
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