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PostPosted: Wed Jan 10, 2018 8:01 pm 
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russxr67 wrote:
Great video Tim. Kudo's to the young fella that put it together as well.
Makes watching dyno sessions a lot more interesting doesn't it?

Thanks Russ, I hope it runs on the track as well as dyno, The whole vid is like 20 minutes, the kid is good, knows every angle, and hi tech camera. Music seems to fit....

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PostPosted: Wed Jan 10, 2018 8:02 pm 
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blykins wrote:
It was a pretty professional video.....

I know blows me away, Your intake valves in there Brent.

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PostPosted: Wed Jan 10, 2018 8:05 pm 
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booyah45828 wrote:
Awesome! Dyno guy took it to 7500? What do you normally shift at?

Yes, best dyno run on other half of vid. I usually shift at 75-7600, and go through the traps at 8200.

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PostPosted: Wed Jan 10, 2018 8:30 pm 
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Gday Tim,
Yeah that makes sense i was forgetting about the vac pump!
Cheers ☺


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PostPosted: Wed Jan 10, 2018 9:07 pm 
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tuffxf wrote:
Gday Tim,
Yeah that makes sense i was forgetting about the vac pump!
Cheers ☺

To tell you the truth never seen any pick up with vacuum pump...took it off for now.. Stick with crankcase breathers and evacs, see what happens.

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PostPosted: Wed Jan 10, 2018 10:27 pm 
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DragBoss wrote:
tuffxf wrote:
Gday Tim,
Yeah that makes sense i was forgetting about the vac pump!
Cheers ☺

To tell you the truth never seen any pick up with vacuum pump...took it off for now.. Stick with crankcase breathers and evacs, see what happens.


That will be an interesting comparison Tim. For all of the expense of a vacuum pump I know of several people who saw zero gain. I am sure some see a gain it always seemed to me like very expensive horsepower. Maybe Brent can jump in with some stories of what he has seen? Brian


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PostPosted: Thu Jan 11, 2018 2:45 am 
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Gday Tim,
When i tried a star pump on the dyno at 10 inches of vac we picked up 5hp at peak.
Couldn't justify it for that, in hindsight would have been good at helping get rid of moisture out of alcohol engines.
Was explained to me that the better the bore prep / hone job and the better the ring seal is the less hp you will pick up with the vac pump.
Makes sense to me and you could watch the vacuum bleeding down slowly after shutting the egine down.
Cheers


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PostPosted: Thu Jan 11, 2018 6:02 am 
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b.guggenmos wrote:
DragBoss wrote:
tuffxf wrote:
Gday Tim,
Yeah that makes sense i was forgetting about the vac pump!
Cheers ☺

To tell you the truth never seen any pick up with vacuum pump...took it off for now.. Stick with crankcase breathers and evacs, see what happens.


That will be an interesting comparison Tim. For all of the expense of a vacuum pump I know of several people who saw zero gain. I am sure some see a gain it always seemed to me like very expensive horsepower. Maybe Brent can jump in with some stories of what he has seen? Brian


To be honest, the engines that I use vacuum pumps on, I wouldn't dare run them without. The ring tension is so low that the engine needs negative pressure.

The piston rings and how they are set up is the major factor in whether you need to pull vacuum or not. The less friction, the better.

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PostPosted: Sat Jan 13, 2018 1:43 pm 
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tuffxf wrote:
Gday Tim,
When i tried a star pump on the dyno at 10 inches of vac we picked up 5hp at peak.
Couldn't justify it for that, in hindsight would have been good at helping get rid of moisture out of alcohol engines.
Was explained to me that the better the bore prep / hone job and the better the ring seal is the less hp you will pick up with the vac pump.
Makes sense to me and you could watch the vacuum bleeding down slowly after shutting the egine down.
Cheers

I have heard the same, one of those try and see things, expensive things, prob got $1800 in everything, well keep testing it.

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