HDi Injectors

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spider
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Joined: 05 Jan 2010, 15:28
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HDi Injectors

Post by spider »

Why is it these tend to stick ?

I don't mean where water gets around them and 'afixes' them in place around their sleeves, I mean the 'blowby' (for want of a better description) builds up securely affixing them in place.

Are the seals not up to it ? , the compression is not really much different in a DI vs IDI unit, then again the fuel pressure can be ten times higher...

I do wonder if they were screwed in this would not happen but then again they would probably snap off if subjected to extreme removal (for replacement) force such as a whizzy gun.

Looking around most manufacturers use clamps rather than threads for Direct Injection units anyway so its not a PSA concern, the only indirect injection unit I am aware of that uses clamps is the ancient 2.25 LR diesel all iron (OHV!, although better than sidevalve I suppose) unit.

I wonder if I have overlooked the obvious reason for a clamp, I thought about costs but it seems all manufacturers use clamps on DI units. :-k