hitting the rev limmiter on the highway? - Page 2 - Ducati Monster Forums: Ducati Monster Motorcycle Forum
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post #11 of 17 (permalink) Old 11-20-2006, 10:40 PM

 
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Re: hitting the rev limmiter on the highway?

Quote:
Originally Posted by whited3
yeah, I'll have to check out which filter the 900 uses. I don't know what else would cause the engine to cut like that....There's no pop like a backfire, just cuts very briefly
FWIW the stock setup has the filter after the pump. The fittings are also larger than the carbed plastic filter.
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post #12 of 17 (permalink) Old 11-20-2006, 10:57 PM Thread Starter
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Re: hitting the rev limmiter on the highway?

hmm, I will try a higher capacity filter, but I think I'll keep the filter before the pump unless someone can convince me otherwise. Thanks for all the great help btw
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post #13 of 17 (permalink) Old 11-20-2006, 11:48 PM
 
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Re: hitting the rev limmiter on the highway?

I would suggest removing the filter and trying it. If the problem isn't fixed you can put it back. Insufficient fuel volume in will equal insufficient fuel volume out. This would be a lot easier than doing a volume test, assuming you can find a volume spec.



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post #14 of 17 (permalink) Old 11-21-2006, 12:55 AM
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Re: hitting the rev limmiter on the highway?

That pump is capable of supporting roughly 500HP, so unless something is *way* out of whack, there shouldn't be any delivery problems.

What kind of fuel pressure regulator are you using?

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post #15 of 17 (permalink) Old 11-21-2006, 08:16 AM

 
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Re: hitting the rev limmiter on the highway?

Quote:
Originally Posted by Speeddog
That pump is capable of supporting roughly 500HP, so unless something is *way* out of whack, there shouldn't be any delivery problems.

What kind of fuel pressure regulator are you using?
True, but the rating is with adequate supply. If the small diameter fittings are reducing flow the spec could drop off rapidly.

Most pumps are better at pushing than sucking. That's why our cars have low pressure high volume transfer pumps to supply the high pressure pump. Maybe gravity isn't adequate in this scenario.
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post #16 of 17 (permalink) Old 11-21-2006, 09:06 AM Thread Starter
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Re: hitting the rev limmiter on the highway?

Oh that's true, the pump is probably designed for pushing. So in any case ill have to try without the filter to see if its starving my pump. Oh, and the regulator is standard ducati equipment, along with the injectors and all the other fueling stuff which came with the engine. Only thing I did was add the filter and pump and fuel lines which are basically same as the originals.
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post #17 of 17 (permalink) Old 11-21-2006, 06:54 PM
 
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Re: hitting the rev limmiter on the highway?

Quote:
Originally Posted by ducpainter
Most pumps are better at pushing than sucking. That's why our cars have low pressure high volume transfer pumps to supply the high pressure pump. Maybe gravity isn't adequate in this scenario.
Yeah, keep in mind all the factory Ducati FI systems seem to use the pump in tank trick - no "sucking" required at all...

I also wonder if the pump does a fair bit more work than the motor power suggests - I recall talk of a return line in the FI tanks - how much of what the pump puts out just gets sent back into the tank?

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