VE pump " star wheel" adjustment - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 09-05-2011, 10:39 PM Thread Starter
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VE pump " star wheel" adjustment

i was playing with my pump today and decided to add a bit of fuel for an upcoming trip down baja, i noticed that my star wheel bottomed out ( clockwise ) after less than 1/4 turn.... seemed odd to me, also since it was my first time in there i noticed that the diaphragm spring was blue / turqoise... any meaning to that..? after a year of daily driving and a couple of trips down baja towing a 27ft fifth wheel driving hard my 4" exhaust still looks like new, nice and shiny and no color at all at the turbo exhaust elbow...
eric
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post #2 of 8 (permalink) Old 09-07-2011, 02:25 AM
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Star wheel is just a preboost adjustment. It adds no extra fueling. It just brings the fueling in sooner, I.E. before you have built boost up.

Someone was into it before you.

Your biggest gains are with the main fuel screw. If you do not have gages. Leave it alone.

93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed
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post #3 of 8 (permalink) Old 09-08-2011, 12:35 AM Thread Starter
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it is possible it might have been adjusted before i owned the truck, however the truck passes emissions with flying colors, in the very low end of the scale and i have lots of room to richen things up so im inclined to believe it is stock... its a california truck 1992. even with 8 to 10,000lbs trailer and very heavy foot on mountain roads my exhaust is not at all discolored, again telling me i have lots of room to richen up the engine without gauges.... im no diesel expert but do have vast mechanical background and engine building and untill i see my exhaust elbow change color i wont worry... back in my race building days the exhaust systems always used to glow red at night, it was normal, and of course the exhaust pipe would not stay shiny like new after one road trip.... and my 4 exhaust shows ABSOLUTELY no sign of any heat leaving the turbo..
ive turned the "smoke adjustment screw in two turns", bottomed out the AFC " star wheel" about 1/3rd of a turn and turned my diaphragm / excentric cone about 75 degres and have felt no difference in power or smoke....
i have not checked my fuel pump or fuel pressure but from all i have read on these post it seems like i should have felt and noticed a difference....
im temped to think im not getting enough fuel to the pump... no fuel = no power even though it seems to run fine i might be asking it to do more that it can give me with the fuel / pressure availlable... im leaving in two days for a trip down baja so i'll have to look at the fuel supply when i get back... maybe i can find the time to sneak in a fuel gauge really quick to check pressures... my 3 other cummins have P pumps and they dont die as easily due to lack of fuel pressure...
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post #4 of 8 (permalink) Old 09-09-2011, 12:44 AM
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Do not go by exhaust system color. It means nothing. Get an EGT gage.

Look at the exhaust pipe in the pic.



That pipe is two years old in that pic. Cummins rated max EGT's is 1250 degrees. That pipe has been to 1050 degrees many times. It has been to 1150 a few times.

If you think you can just turn the fuel up till the pipe changes color. I'll tell you right now. The engine will melt before that happens.

93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed
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post #5 of 8 (permalink) Old 09-24-2011, 05:19 AM
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Philip, what turbo exhaust housing is that? I just installed a new 14cm housing on mine and it dont look like that, yours looks like it has an adapter bolted on for the exhaust pipe.

oh and by the way the new turbo housing has made a nice improvement so far,, just got my new injectors and will be scheduling the truck in for install and having the pump re set in a couple of weeks.
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post #6 of 8 (permalink) Old 09-25-2011, 12:08 AM
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That turbo is a Super HX40. It has a T3 16cm exhaust housing on it. The spec's are 60/65/16.

93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed
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post #7 of 8 (permalink) Old 02-10-2012, 04:33 PM
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I would deffentlly check you lift pump presure.Did you take the nylon spacer out from under the diaphram.

Dale

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post #8 of 8 (permalink) Old 09-21-2013, 10:03 PM Thread Starter
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my exhaust is more than 2 years old and still shiny like new with no signs of heat unlike yours which shows discoloring, all i am saying is that i can gauge exhaust temp by the color of the pipe, i am not sugesting adjusting my fuel by exhaust pipe color, but simply stating that right now, with 1/2 turn of the fuel screw and a bd fuel pin and 3200 spring my engine is still running very cool exhaust temps.
would i turn the fuel screw in to max and see what the pipe color looks like, no, that would be stupid, and yes, the pistons would melt before the exhaust would change color, all i am saying is that right now after several years of use with minor fuel mods i am still running cool.
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