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Tractor Pulling Discussion Forum

turbo on gas

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smdv806

12-08-2007 16:06:34




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I scratched the idea of using fuel injection or blowing through the carb. I am going to put the turbo between the carb and the manifold. What things should I watch out for? Do I need any additional pressure relief valves? How do I keep the turbo from sucking parts of my carb into it? How do I control the throttle----wouldn't boost keep my butterfly from closing? etc.....
This is a farmall 560.

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JHH

12-09-2007 03:52:33




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 Re: turbo on gas in reply to the real roger, 12-08-2007 16:06:34  

smdv806 said: (quoted from post at 17:06:34 12/08/07) I scratched the idea of using fuel injection or blowing through the carb. I am going to put the turbo between the carb and the manifold. What things should I watch out for? Do I need any additional pressure relief valves? How do I keep the turbo from sucking parts of my carb into it? How do I control the throttle----wouldn't boost keep my butterfly from closing? etc.....

This is a farmall 560.


You will need a turbo with an oil seal on the compressor side or you will suck oil from the bearing into the intake when the throttle is closed.

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Ian Johnsen

12-08-2007 20:15:09




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 Re: turbo on gas in reply to smdv806, 12-08-2007 16:06:34  
One thing to watch for with a draw through set up is icing of the carb adapter. This is caused by pressure drop from the suction of the turbo. It will only happen after running for awhile. Our club's turbo class requires our carbs to be in the stock location and the throttle must go through the governor(modified governor, of course).Are you planning on using an internally or externally wastegated turbo? With a draw through set up, you shouldn't need a blow off valve, since you won't have to worry about boost against your butterfly. You will have a little lag on throttle response up and back to idle.

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smdv806

12-08-2007 21:55:40




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 Re: turbo on gas in reply to Ian Johnsen, 12-08-2007 20:15:09  
Im wanting to use one of those little car turbo's like a garrett t3. I think those are internally wastegated? Would fuel over time hurt the turbo?



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Ian Johnsen

12-10-2007 20:38:22




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 Re: turbo on gas in reply to smdv806, 12-08-2007 21:55:40  
T3's are available in internally and externally wastegated. I got an external one from a Saab 900.I Teed off my governor oil line for my oil. I ran the return line to the oil pan. I drilled and welded a theaded bung in the pan. Do not skimp on the size of the return line. If it clogs or is too restrictive, you will blow your seal or cook the oil in the turbo. Most car turbos have water cooling lines as well. I don't run them on mine. 300 feet isn't far enough to worry about it. If you are going to plow...I'd consider cooling the turbo. On a gas turbo, you may also want a multiple spark ignition box. It would suck to blow out your one spark.

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Ian Johnsen

12-10-2007 20:45:43




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 Re: turbo on gas in reply to Ian Johnsen, 12-10-2007 20:38:22  
Oh yeah, the oil return line works with gravity, so it will have to run down hill without any uphill sections. Its always a good idea to let your turbo motor idle for a couple of minutes before shutting it down. It will allow the turbo to cool down, and be less likely to cook the oil.



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buickanddeere

12-09-2007 06:58:05




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 Re: turbo on gas in reply to smdv806, 12-08-2007 21:55:40  
10psi of boost is so low you can run without an intercooler. Go with a draw through system and a carb.
As you get addicted to higher and higher boost. You can add water/alcohol injection if detonation occurs when using 100LL gasoline.
Inject the water at the compressor discharge, not into the inlet. Buick ran turbo V6's for years with a draw through carb without gasoline related seal problems. Problem dork drivers who would scream onto the drive way with a red hot turbo. Blip the throttle and wind the turbo up to full rpms. Then shut the engine off and leave the hot high rpm turbo winding down without fresh lube oil. The lube oil also tended to be both old and the cheapest stuff on the store shelf. RHF4 to RHF6 at the absolute largest will do fine. They are new units with wastegates and cheap on ebay. Link

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smdv806

12-09-2007 14:29:08




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 Re: turbo on gas in reply to buickanddeere, 12-09-2007 06:58:05  
What do you mean lube oil? I thought turbos just used a pressurized oil line from the tractor for lubrication? How is this turbo setup?



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buickanddeere

12-09-2007 20:29:59




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 Re: turbo on gas in reply to smdv806, 12-09-2007 14:29:08  
Fresh clean cool lube oil from the engine's oil pump/filter/cooler. This vital cooling and lubricating oil stops flowing when the engine is shut off. The turbine can spin for about a minute then heat soak what lube oil is left into gritty ash. You will need a turbo lube oil drain line back down to the oil pan as well. Don't get tempted to size a turbo only for max HP. Low end torque will suffer and spool up time will take forever.

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smdv806

12-10-2007 07:26:59




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 Re: turbo on gas in reply to buickanddeere, 12-09-2007 20:29:59  
What is the best place to run an oil feed line off of the engine? Can I run the return line into the valve cover?



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buickanddeere

12-10-2007 11:01:12




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 Re: turbo on gas in reply to smdv806, 12-10-2007 07:26:59  
I wouldn't connect at the far end of the main bearing oil gallery from the oil pump. Some turbo require an oil flow restricter or they may blow a seal. Or just take so much oil they will starve a borderline engine's oiling system. You don't want to dump any extra hot frothy oil into the top end of the engine where you want cool oil. It may also aggravate oil consumption past valve seals. It will certainly increase windage, oil heating and frothing by having the crankshaft churning the oil on it's way to the oil pan.

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