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My latest veggie conversion - best yet?

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Old 03-05-2015, 12:43 PM
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Originally Posted by M-S-G View Post
What's up with using two rear ports and two front ports?

How is that a good idea?
I would think there is a reason standard config is on opposite ends of the engine...
I am feeding diesel to the front ports on the engine and WVO to the rear ports. There is no way to know why Ford chose opposite ends on the later 7.3's... The early 7.3's (OBS) fed the rear ports and returned fuel thru the front ports. The heads are symmetrical and are identical plumbing-wise for all 7.3 PSD's and Int'l 444's during the same era.

It is not just a good idea, it is BRILLIANT! This design allows me to open a valve on the VO-side of the system and flush diesel thru the heads - 'purging' all of the VO from the engine in just a few seconds. If we only fed one end of each head with fuel, we'd have to wait for the slow dilution of the fuel in the heads and injectors - making the 'purge' time significantly longer. Also, each time we 'purge' - we send any accumulated trapped air in the heads back to the VO tank. This is akin to what the Regulated Return or Fuel Rail Crossover modifications do.

Additionally, the rear of the engine is arguably hotter than the front. In theory, up front we have some additional cooling from the fan and just being more open. In the rear, we are confined near the firewall and the fuel lines are VERY close to the turbo up-pipes. While additional heating at this point isn't really necessary with my systems, it doesn't hurt anything either.

I have done a couple dozen PSD conversions using this basic design and every one of them is still functioning as far as I know. The first truck pictured here had already racked up 25k miles back in November and the second truck might have 20k miles on it and has been plowing snow all winter in the NE burning the high cholesterol fuel. Another conversion I did last year also put more than 25k miles on his F250. It's safe to say this system works!!!!!
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Old 03-05-2015, 12:43 PM
 
 
 
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