New insight in IDI burning WMO - need high compression or turbo

[ut99dot1]

hi all, every single time, my car starts losing power after 3-5k miles, lots of smoking too. Definitely incomplete combustion. No matter the WMO - diesel/kerosene ratio it happens around 3-5k all the time.
I found out the reason: the injectors heatshields get plugged;

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After replacing them power is restored (temporary).

That was last time, all were equally plugged. This time 2 were ok'ish, and the other 2 were plugged like above. What was the difference? The 2 cylinders with the fouling had lower compression (325 vs 400 psi)! Made me think, with the IDI the air that's forced in the pre-chamber is used to mix fuel and air, see for example this old bosch movie:

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Less compression = less mixing, worse combustion

I will put a turbo on it, low boost (5 to 10psi), and see how it fares!

 

[kbenz]

Rug will thin the oil better. Not sure if that will help you or not but thinner oil can't hurt

 

[Jesus Freak]

I agree with both of you. But we all can agree that of all the science experiments you can do with our vehicles, WMO is the one for us! Thanks for the input and update.

 

[Far Right]

I have a NA6.5 chev, she’ll run fine on 50/50, but full mix will only go a few tanks till my injectors are proper coked, I’m also in the process of turbo install, I’m absolutely no expert but all the advice on here says you need to give ya rig a good hard heavy run here and there to keep it all clean. I tried this with my N/A n the lack of boost meant I just cokes the injectors sooner,

 

[Black dawg]

Had this same problem with a healthy 6.5 with turbo. Never checked compression, but was a very easy starting one down even below zero, so I think compression was probably good.

I did try healthy vs pissy injectors, and also much higher pop pressure. Didnt make much difference, roughly same amount of time until coked.

 

[Far Right]

Hmmmm, not what I wanted to hear. Wonder what it is with the 6.5 set up compared to the 7.3? heads look very similar in design from pics I’ve seen

 

[Black dawg]

I have never seen even a little bit of coking on the end of a 6.9 7.3 injector, and I have seen some that were treated really poorly with 100%wmo.

The ends of the injector is shaped completely different.