Go Back  Offshoreonly.com > Technical > Do It Yourself, Boating on a Budget
350 meg not performing up to par ? >

350 meg not performing up to par ?

Notices

350 meg not performing up to par ?

Old 08-25-2019, 03:51 PM
  #51  
Registered
 
Join Date: Aug 2019
Posts: 46
Likes: 0
Received 0 Likes on 0 Posts
Default

Through prop exhaust, coupled with poor manifolds are going to be a real restriction.

Yes the new B1 4 blade is more aggressive, and keeping the RPM down, but with a good tuned manifold feeding through hull, may get the engine output over the 'hump', and perform well.

I agree, the smaller prop. That will give more data. Where does the smaller prop max out at with the new engine?
Tartilla is offline  
Old 09-15-2019, 03:30 AM
  #52  
Registered
 
Join Date: Aug 2019
Posts: 46
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by hotshot537 View Post


She little dirt but cleans up nicely

ill try that over the weekend.......but what I think it is exhaust is cutting it back. Going to put through transom exhausted this week. and also if I could find some used headers try to0

trying to get the thing to at least 450hp 450tq

what do you guys think about port matching the stock exhaust manifold to the AFR heads ? Exhaust ports are about a 1 3/8 and the stock exhaust manifolds are about 11/4inch
If you leave the lower portion of the exhaust manifold larger, you get a lip formed, where the head exh outlet is smaller.

This acts as an anti reversion system. (Air) It also would likely trap some water a little, before it overflows and gets into the cylinder.
Tartilla is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


OSO Sponsor
OSO Advertiser
OSO Advertiser

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

OSO Advertiser