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Discussion Forum

D-21 Pulling Question

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02-02-2000 14:26:38

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I've watched super stock D-21's pull, and they seem to do all right for themselves.

Those can't be stock injectors and turbos. What would they typically run?

Thanks in advance.

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02-02-2000 15:27:33

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 Re: D-21 Pulling Question in reply to B.C., 02-02-2000 14:26:38  
The pullers won't give all their secrets away, but I talked to a guy once and he gave me some hints. He ran 4 (yes, FOUR) turbos, final boost pressure was close to 200 PSI. Water injection to keep her from melting down, not sure what he did to the engine, but I'll bet it was close to the 520 CI they allow, probably turned the pump way up. Also the stock engine runs at 2,000 or so RPM's, these might be doing close to 6,000 or more. Maybe some other pullers can fill us in?

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02-02-2000 18:17:47

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 Re: Re: D-21 Pulling Question in reply to Aaron, 02-02-2000 15:27:33  
20 years ago I read a book about turbocharging by Hugh McInnes. He said then that 100 psi of boost was doable and wouldn't necessarily be the most that could be run.

Another part I really don't understand is how the cranks and blocks can take all that. Granted, most of the hammering in any diesel takes place when the fuel first starts burning, regardlessof the load, but still...

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02-02-2000 18:47:52

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 Re: Re: Re: D-21 Pulling Question in reply to B.C., 02-02-2000 18:17:47  
I don't think they do take it. This guy was an AC dealer and I think the tractor spent the week in the shop getting tore down and rebuilt. You for sure don't get into it for the money. I seem to recall the number $50,000. And that wasn't prize money. Think it takes lots of blocks, rods, pistons, injectors, etc. Cranks proaobly do OK cause they can be built extra heavy. This guy said 200 psi of boost. He had 2 small turbos feeding one big one, feeding yet a bigger one. Good luck getting oil to all that. Fun to watch, but expensive to run. He probably got into it for some advertising.

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02-03-2000 06:42:53

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 Re: Re: Re: Re: D-21 Pulling Question in reply to Aaron, 02-02-2000 18:47:52  
Sounds every bit as lucrative as semi-pro drag racing.

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