More Rtech dyno results
#11
Registered
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Hey Tom,
Could you email me the program/log so I can compare notes.
Didn't catch the injector size. We are running 72s with an Aeromotive with a 1:1 regulator (43-52psi) with no fuel shortage at 5800- 6000rpm on almost the identical setup except for the Valako Canfields.
We also run a large Holley high volume/low pressure primer pump into a large Racor separator as well which helps tremendously. It allows the rotary vane to do what it's suppose to; push and not pull
Do you have large enough feeds?
Thanks,
Dave
Could you email me the program/log so I can compare notes.
Didn't catch the injector size. We are running 72s with an Aeromotive with a 1:1 regulator (43-52psi) with no fuel shortage at 5800- 6000rpm on almost the identical setup except for the Valako Canfields.
We also run a large Holley high volume/low pressure primer pump into a large Racor separator as well which helps tremendously. It allows the rotary vane to do what it's suppose to; push and not pull
![Big Grin](/forums/images/smilies/biggrin.gif)
Do you have large enough feeds?
Thanks,
Dave
#13
Platinum Member
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Originally Posted by SB
Great info !
As Smitty showed, many electric fuel pumps can really 'step up to the plate' as voltages are increased.
I, too, would talk to an engineer (not sales person) at Aeromotive about doing the same. They typically have fuel pump dyno tests + graphs plotting volts vs psi vs volume.
While you are talking to them, you may want to ask about the two fuel pump set-up and see what they think, in your set-up, about installing the two pumps in series or parralel.
===========================
Very impressive power BTW . COngrats !!!! Hope the new owner fully respects what this power/boat combo may present.
As Smitty showed, many electric fuel pumps can really 'step up to the plate' as voltages are increased.
I, too, would talk to an engineer (not sales person) at Aeromotive about doing the same. They typically have fuel pump dyno tests + graphs plotting volts vs psi vs volume.
While you are talking to them, you may want to ask about the two fuel pump set-up and see what they think, in your set-up, about installing the two pumps in series or parralel.
===========================
Very impressive power BTW . COngrats !!!! Hope the new owner fully respects what this power/boat combo may present.
Last edited by articfriends; 07-25-2006 at 12:54 PM.
#14
Registered
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Why would you not run a real fuel pump like a Weldon 2015 or a 2025?.
I am very familier with the Aeromotive pump, bosch, Holley, and Barry Grant. And the ONLY pump that will flow what they advertise is weldon.
RT
I am very familier with the Aeromotive pump, bosch, Holley, and Barry Grant. And the ONLY pump that will flow what they advertise is weldon.
RT
#15
Platinum Member
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Originally Posted by RBT
Why would you not run a real fuel pump like a Weldon 2015 or a 2025?.
I am very familier with the Aeromotive pump, bosch, Holley, and Barry Grant. And the ONLY pump that will flow what they advertise is weldon.
RT
I am very familier with the Aeromotive pump, bosch, Holley, and Barry Grant. And the ONLY pump that will flow what they advertise is weldon.
RT
#16
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I think the injectors were 72 but I don't know the pulley sizes. Apparently the reason for losing fuel pressure was an 11 volt battery. I haven't got a copy of the log yet, but we can compare notes when I do. The owner is a former Factory 1 driver/throttleman and can handle the boat, but I don't know how long the XR is going to handle the torque.
Smitty: It would be interesting to compare the curves; I will see if I can find your numbers and plot them on the same graph. Your intake, heads and cam should make more torque.
Smitty: It would be interesting to compare the curves; I will see if I can find your numbers and plot them on the same graph. Your intake, heads and cam should make more torque.
#17
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Originally Posted by tomcat
I think the injectors were 72 but I don't know the pulley sizes. Apparently the reason for losing fuel pressure was an 11 volt battery. I haven't got a copy of the log yet, but we can compare notes when I do. The owner is a former Factory 1 driver/throttleman and can handle the boat, but I don't know how long the XR is going to handle the torque.
Smitty: It would be interesting to compare the curves; I will see if I can find your numbers and plot them on the same graph. Your intake, heads and cam should make more torque.
Smitty: It would be interesting to compare the curves; I will see if I can find your numbers and plot them on the same graph. Your intake, heads and cam should make more torque.
#18
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I found the dyno sheet on your thread; this graph shows the comparison. The combination of the AFR heads, long runner intake and milder cam definitely make more torque down low, as much as 90 ft-lbs @ 3800; they two engines have the same torque @ 5400, after that the solid roller will pull away.
Kind of makes you go hmmm.... Both engines will be Bravo busters; but would the solid roller engine's ability to rev, combined with a lower pitch prop give up anything in acceleration? Would it be any easier on drives?
The blower pulley was 4.75" but I think the old M-3 gear ratio is 4.44:1. At 6000 RPM this is a blower speed of ~42,000 RPM. In your thread you said a 3.85" pulley was used and I think the gear ratio in the M-3SC is 4.1:1. At 5600 RPM this is a blower speed of ~45,000 RPM.
Kind of makes you go hmmm.... Both engines will be Bravo busters; but would the solid roller engine's ability to rev, combined with a lower pitch prop give up anything in acceleration? Would it be any easier on drives?
The blower pulley was 4.75" but I think the old M-3 gear ratio is 4.44:1. At 6000 RPM this is a blower speed of ~42,000 RPM. In your thread you said a 3.85" pulley was used and I think the gear ratio in the M-3SC is 4.1:1. At 5600 RPM this is a blower speed of ~45,000 RPM.
#19
MarineKinetics
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Steve/Tom,
Great information!
If I can offer a suggestion...try an overlay of the TQ/BSFC curves, there may be some answers there.
Bob
Great information!
If I can offer a suggestion...try an overlay of the TQ/BSFC curves, there may be some answers there.
Bob