Offshoreonly.com - vacuum @ WOT?

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- - vacuum @ WOT? (https://www.offshoreonly.com/forums/do-yourself-boating-budget/205456-vacuum-%40-wot.html)

GPM	03-25-2009 10:24 PM

I wasn't picking on your cam, I only see around 6 inches at idle, but it's 276/284 @.050 .780 lift.

mike tkach

03-26-2009 12:08 AM

Quote:

Originally Posted by tx911 (Post 2828431)

Thanks for the reply bajabob, timming is 34deg fixed, I have a 25 mirage prop, it just handles better with the four blade. I have not tried the mirage with this motor, I guess I will throw it on and see. I am just not certain about the carb setup, but that may not be my problem, maybe I am over propped. Motor before this was a 540 merlin with almost same power on dyno, but I was swinging a 27 mirage plus with that motor.

try a 23 p prop and bump timing to 36,if using 93 oct you will be safe at 36 total:ernaehrung004:

offthefront

03-26-2009 05:45 AM

12-15 vaccum at idle calls for 65 PV ....

tx911

03-26-2009 06:02 PM

I tried 6.5pv it ran like poo., When getting on plane I am down to pretty much 0.

GPM I didnt think you where picking on it, I just assumed it was most likely larger then the 741 and 731s most seem to be running

BenPerfected

03-26-2009 10:05 PM

Checked you vacuum at idle in gear at the RPM you normally run off plane. For sure, your PV (s) need to be below this reading.

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