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Author Topic: Injectors  (Read 1073 times)
Denny
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« on: September 11, 2013, 11:59:48 AM »

I have 100 injectors in my 6V92T.  The horsepower when new (90,000 miles ago) was 365 hp on the dyno.  I am smoking more that I would like and am thinking of going to a smaller injector.  My question is do they make a 95 injector or do I have to go to the 90?  How much horsepower will I loose in going to a smaller injector?
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TomC
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« Reply #1 on: September 11, 2013, 12:04:03 PM »

Injector size vs horsepower is directly proportionate. So if you have 365hp with 100's, then you'll have 347hp with 95's and 330 with 90's. You should be able to run 100's in the 92 series-just have to make sure you have the right turbo setup. Your engine longevity will take a hit. Most likely the engine will last about 200,000miles. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
luvrbus
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« Reply #2 on: September 11, 2013, 12:17:37 PM »

9G90 or 9A90 will drop you to 350 hp the G is the best injector by far on a 6v92TA  350hp, 1020# of torque @1200 rpm ,I have never ran across a 95 in the modern injectors like the G's you won't miss 15 hp IMO

good luck
« Last Edit: September 11, 2013, 12:34:51 PM by luvrbus » Logged

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chessie4905
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« Reply #3 on: September 11, 2013, 02:49:13 PM »

  What would happen if he changed the setting with a different gauge instead?
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GMC h8h 649#028
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wg4t50
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« Reply #4 on: September 11, 2013, 03:01:38 PM »

I had great luck & power with the 9200 injectors, just a heat wave after you got the turbo up to snuff/ speed. Great power tooo.

Should add, I installed the turbo from the 6V-92 on the 8V-92, this gave more boost psi and that caused a problem with the air box covers leaking.  Solved that issue and things got more exciting.

That is when it would out do the12V-71.
« Last Edit: September 11, 2013, 05:34:28 PM by wg4t50 » Logged

MCI7 20+ Yrs
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akroyaleagle
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« Reply #5 on: September 11, 2013, 04:45:33 PM »

Denny,

Just a couple of thoughts.

When are you making too much smoke? If it happens at takeoff and seems better with speed, you may need to drive with a lighter foot.

If you have any air at all leaking after the turbo, you will make smoke.
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Joe Laird
'78 Eagle
Huron, South Dakota
RJ
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« Reply #6 on: September 11, 2013, 09:40:57 PM »

Denny -

How long has it been since you've cleaned/replaced the air filter(s)?  90,000 miles?  Dirty filters could be causing your smoking issue.

If you're smoking while pulling a hill, it's time to downshift to the next lower gear.

Often smoking issues can be cured by changing to flip-flops from boots.

As Clifford said, the 9G90s seem to give the best bang for the buck in the 6V92, if you want to go that route.

FWIW & HTH. . .

 Wink
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RJ Long
PD4106-2784 No More
Fresno CA
Sam 4106
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« Reply #7 on: September 12, 2013, 04:56:07 AM »

Denny,
When posting questions about your bus, it would be nice if you included the make, model and year of bus that you have. From the picture I'm guessing GM 4104, so your 6V92T engine would be a transplant. In addition to Joe's and RJ's comments, any exhaust leaks before the turbo will also cause smoke, and a restriction in the air intake will also cause smoke. Is the opening for the air intake, ahead of the air filter, large enough to flow the extra air needed for your turbo engine? Do you have a filter minder, and how many inches of vacuum is it showing?

Good luck, Sam
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1976 MCI-8TA with 8V92 DDEC II and Allison HT740
luvrbus
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« Reply #8 on: September 12, 2013, 05:58:08 AM »

Guys his foot is not going to help him much that is too much injector for a 6V92 in a bus it delivers 100 millimeters of fuel for every 1000 strokes of the engine that is a lot of fuel they are fine for a boat but the carbon build up and heat will in time cost him a engine  

The last 2 numbers on the G injectors are the fuel delivery in millimeters @ 1000 strokes  the 90 is more than adequate for him,the 330 hp with a 7511 turbo with a A/R of 1.08 with 9G85 injectors would make him a clean,long lasting and low heat engine but it seems like he wants hp those little guys(6V92) can handle just so much fuel without problems
« Last Edit: September 12, 2013, 06:05:48 AM by luvrbus » Logged

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TomC
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« Reply #9 on: September 12, 2013, 08:25:56 AM »

I had a GMC Astro with a silver 6V-92TA in it with 9A90's and a straight 7spd. Tough little engine and overhauled at 500,000miles. They will last a long time if properly serviced, not allowed to overheat, and driven with fuel mileage in mind. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
Denny
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« Reply #10 on: September 12, 2013, 10:48:14 AM »

Thanks for all of your thoughts.  I will try to answer some of the questions you asked.  It is a 58 4104 and I have owned it for over 20 years and have logged over 210,000 miles on it, so I am not a novice with my foot.  I noticed the smoking last week when towing my white ski boat to Lake Mead.  The drivers side had black soot on the side.  When driving I cannot see much smoke but I know it is there.  The air filter is the washable type and the vaccume meter is not showing anything (it was just cleaned).  I normally clean it between 10 and 15 inches.  I routinely check the exhaust gaskets for leaking so I don't loose turbo boost.  I have had that problem in the past so I check it frequently.  When the engine was being built they had it on the dyno for about 18 hours changing turbo snails and impellers so I think that is correct.  I haven't had the rack adjusted for about 20,000 miles but I am thinking about just changing to the 9G90s but I do like the horsepower.
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wg4t50
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« Reply #11 on: September 12, 2013, 11:56:02 AM »

365 hp, 6V-92T, on a dyno is not a big number, 450 hp for the 6V-92  @ 1800 is also normal.  We require 345 hp from the 6-71T @ 1800 RPM for generator service, 200 kw, so my guess is, bad fuel, bad injectors, poor rack setting, timing, valve lash, bad turbo, poor air supply, too low rpm, lugging.
Great subject for opinions.
« Last Edit: September 13, 2013, 01:15:22 AM by wg4t50 » Logged

MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
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