SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: shawnthedrifter on May 27, 2009, 11:19:47 AM

Title: What should...
Post by: shawnthedrifter on May 27, 2009, 11:19:47 AM

My RPM's be turning to get the full effect of a high rise manifold? I was thinking from 5500-6500??? I have an AB impeller and i cant turn it more than 5900. I think i need a lower cut like a B.

Title: Re: What should...
Post by: ryanbrindle on May 27, 2009, 11:28:32 AM

I would think that 5900 would be pretty bitchin!

Title: Re: What should...
Post by: IRRebel on May 27, 2009, 12:07:16 PM

Quote from: ryanbrindle on May 27, 2009, 11:28:32 AM

I would think that 5900 would be pretty bitchin!

X2, if you have the HP at that speed to back it up, should be good to go, I would think. If you do, I would go down, not up.

Ray

Title: Re: What should...
Post by: shawnthedrifter on May 28, 2009, 10:46:09 AM

Its a 468 Big Boy Chevy. 13:1. Pretty stout engine. I dont think im pushing enough water out of the pump or its not spinning enough. Im gonna try a different nozzle insert.

Title: Re: What should...
Post by: pw_Tony on May 28, 2009, 12:25:04 PM

What's your MPH at 5900 rpm with the AB cut?

And what's your cam profile?

What's your head set up?