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Tractor Pulling Discussion Forum

either on pulling tractors

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Jake123

02-21-2005 18:16:40




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My friend went to Louisville tractor pull and noticed that they had to keep spraying either in the tractors to keep them running. Why? He also said that they seem to use it more on IH tractors than deere. Why would that be? thank you




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buickanddeere

02-21-2005 19:18:37




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 Re: either on pulling tractors in reply to Jake123, 02-21-2005 18:16:40  
Low compression pistons to run at more than 7 atmospheres of pressure.Barely enough heat from compression when idling to light the fuel. The huge injectors don't break the fuel up into a ideal mist when idling. Engine gets sooted up.



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timing too

02-22-2005 06:40:55




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 Re: either on pulling tractors in reply to buickanddeere, 02-21-2005 19:18:37  
The way they have their timing set also affects it. Most run around 13:1 compression so they can get a ton of boost from 3 or 4 turbos.



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ejr-IA.

02-21-2005 19:17:26




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 Re: either on pulling tractors in reply to Jake123, 02-21-2005 18:16:40  
These engines are decompressed ,compression is lowered to allow more volume in the cylinder for more air and fuel.Stock diesels have more compression and generaly start unassisted.



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buickanddeere

02-21-2005 22:25:38




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 Re: either on pulling tractors in reply to ejr-IA., 02-21-2005 19:17:26  
Compression ratio does not affect swept volume. Thats bore & stroke.



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ToddF

02-22-2005 06:28:29




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 Re: either on pulling tractors in reply to buickanddeere, 02-21-2005 22:25:38  
I believe that EJR is refering to the volume of standard air that can be packed into the cylinder rather than the swept volume. With a blown engine the air is "Pre-compressed" such that the effective compression ratio is increased as compared to a naturally aspirated engine of like design. For instance, if the compression ratio is 20:1 with 4 ci compressed volume, and the compressed volume is then increased to 4.25 ci, more air has to be added during the intake cycle (via a blower) to get the effective compression ratio back up to 20:1. This is the same theory that the restrictor plate race engines use only reversed. The result is that restrictor plate engines are above optimum compression at idle and the blown engines are below optimum compression at idle. As previously stated the either ignites at the lower compression temp of a lower compression engine.

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