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Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Cam and valvetrain longevity....??? low duration high lift... (https://www.offshoreonly.com/forums/general-q/341258-cam-valvetrain-longevity-low-duration-high-lift.html)

Gimme Fuel 09-21-2016 09:27 PM
Originally Posted by Black Baja (Post 4483812)
Motor is still trying to go but can't. Usually means there is a restriction. When you do a pull and it drops of fast it means the motor is done.
Yes. This. Manifold vacuum readings at WOT would be real easy to confirm this.

Full Force 09-21-2016 09:28 PM
posted pic... from dyno.
Originally Posted by Gimme Fuel (Post 4483827)
Yes. This. Manifold vacuum readings at WOT would be real easy to confirm this.

Full Force 09-21-2016 09:30 PM
seems that way, I thought we discussed it, and I also thought it was .4 or something, I was told .5 is ok... not sure where to look for a restriction.. ports lined up good, WOT is present.. I could see arrestor maybe on the boast but not on dyno...

Originally Posted by donzi matt (Post 4483826)
Am I reading that right? Almost 2" vacuum at WOT?

If so, you got a restriction up top.

donzi matt 09-21-2016 09:33 PM
Originally Posted by Full Force (Post 4483829)
seems that way, I thought we discussed it, and I also thought it was .4 or something, I was told .5 is ok... not sure where to look for a restriction.. ports lined up good, WOT is present.. I could see arrestor maybe on the boast but not on dyno...
Got a buddy with a pair of dominators you can try?

Full Force 09-21-2016 09:37 PM
I don't, not sure how I can fit them either under hatch ugh..
Originally Posted by donzi matt (Post 4483830)
Got a buddy with a pair of dominators you can try?

donzi matt 09-21-2016 09:39 PM
I was thinking just to see how the motor liked them. Just take the hatch off and let her eat.

Full Force 09-21-2016 09:39 PM
Dyno shows using 850 CFm, so I ruled out doms, figured at that point my 1050's were good hmm

Full Force 09-21-2016 09:39 PM
I can ask around and see ..
Originally Posted by donzi matt (Post 4483836)
I was thinking just to see how the motor liked them. Just take the hatch off and let her eat.

donzi matt 09-21-2016 09:42 PM
Originally Posted by Full Force (Post 4483839)
I can ask around and see ..
No matter what is going on with the cams, 1.7" vacuum at WOT is NFG and holding you back. I'd start with bigger carbs and see how it responds if it was me before trying anything else.

Gimme Fuel 09-21-2016 09:50 PM
Originally Posted by Full Force (Post 4483837)
Dyno shows using 850 CFm, so I ruled out doms, figured at that point my 1050's were good hmm
That's not how many CFM the engine WANTS, that's just how much it was able to pull through the restriction. Bet you threw bigger carb/intake on you would use more cfm.


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