Go Back  Offshoreonly.com > Technical > General Q & A
Who has had issues with afr heads?? >

Who has had issues with afr heads??

Notices

Who has had issues with afr heads??

Old 05-29-2015, 11:16 AM
  #11  
Registered
Thread Starter
iTrader: (5)
 
Join Date: Jul 2009
Location: Taunton Ma
Posts: 8,284
Received 508 Likes on 247 Posts
Default

You need to start building simpler sh!t lol
Unlimited jd is offline  
Old 05-29-2015, 11:44 AM
  #12  
Registered
iTrader: (2)
 
Join Date: Aug 2011
Location: bel air, md
Posts: 2,735
Likes: 0
Received 3 Likes on 3 Posts
Default

Originally Posted by Unlimited jd View Post
You need to start building simpler sh!t lol
My Father always told me I needed to get my head examined.
Black Baja is offline  
Old 05-29-2015, 11:51 AM
  #13  
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 12,307
Received 2,037 Likes on 860 Posts
Default

Mine always said: if you can't afford double of what ever you are building, don't build it.
SB is offline  
Old 05-29-2015, 11:53 AM
  #14  
Registered
iTrader: (1)
 
Join Date: Feb 2011
Posts: 2,640
Likes: 0
Received 4 Likes on 3 Posts
Default

Mine told me to find something worthwhile to throw my money at. That, and "turn those damned lights off and close the front door, we don't want to air condition the whole neighborhood." It seems that I'm starting to sound just like him these days.
Budman II is offline  
Old 05-29-2015, 11:58 AM
  #15  
Registered
iTrader: (1)
 
Join Date: Feb 2011
Posts: 2,640
Likes: 0
Received 4 Likes on 3 Posts
Default

You can make the argument on lifter to bore clearance that is being made on valve guide clearance. At the end of the day, you can have variances stack up and work against you when you are assembling an engine. Add to that the fact that many of us are running higher valve lifts, higher spring pressures, and spinning the motors faster, and it becomes much more crucial to check ALL the clearances before we drop a motor in a boat. I wish I had checked my guide clearances, because it would dispel one more nagging worry when I run the boat. Maybe I worry too much - I need to make the wife drive and sit back and drink beer.

As Black Baja reported, there are probably tens of thousands of these heads running out there without issues. But machine tolerances can vary, and occasionally you can have the perfect storm of factors that result in an unfortunate situation like Full Force had happen to him. We probably need to wait for all the facts to be revealed before we jump to conclusions about issues with AFR heads.
Budman II is offline  
Old 05-29-2015, 12:02 PM
  #16  
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 12,307
Received 2,037 Likes on 860 Posts
Default

Bring your heads to 10 different head machinists and see what they report back for valve guide clearances. Most reports will not agree with each other.
SB is offline  
Old 05-29-2015, 12:27 PM
  #17  
Registered
iTrader: (2)
 
Join Date: Aug 2011
Location: bel air, md
Posts: 2,735
Likes: 0
Received 3 Likes on 3 Posts
Default

Originally Posted by SB View Post
Bring your heads to 10 different head machinists and see what they report back for valve guide clearances. Most reports will not agree with each other.
Especially when dealing with .0001 measurements. The same guy could use the same tool on the same guide two different days and come up with different measurements. That's where experience comes into play. Knowing your tools and the affect temperature has on things plays a big part in being successful.
Black Baja is offline  
Old 05-29-2015, 02:13 PM
  #18  
Registered
 
Join Date: Feb 2005
Location: cincinnati,oh.
Posts: 516
Likes: 0
Received 32 Likes on 21 Posts
Default

I think operating temperature has a lot to do with some of these problems
fbc25el is offline  
Old 05-29-2015, 03:05 PM
  #19  
Registered
 
Join Date: Nov 2008
Location: Hudson, IL
Posts: 524
Received 35 Likes on 11 Posts
Default

Originally Posted by Black Baja View Post
I have to ask. If "Every" installed set of AFR's had to have the guides opened up. Just exactly was the out of the box clearance? And if you open them up what are they being opened up to? I ask out of curiosity not to start an argument. When we measure 2 intake and 2 exhaust we got .0018 across the board. We re-checked this measurement a bunch of times even re-calibrated the gauge cause it didn't seem right to us that they all came up the same. At this point I asked the guy that built my friends motor with new out of the box Brodix heads of he measured the guide clearance. He said most of them were .0013 but a few got up to .0017. He left them what they were from Brodix and explained to me he likes to see them under .0015 and thought the AFR's were a little on the loose side.
Mercs heads all come in between .0021 and .0023.
Precision is offline  
Old 05-29-2015, 03:14 PM
  #20  
Platinum Member
Platinum Member
iTrader: (1)
 
14 apache's Avatar
 
Join Date: Apr 2005
Location: Northport N.Y.
Posts: 2,132
Received 10 Likes on 10 Posts
Default

Originally Posted by Precision View Post
Mercs heads all come in between .0021 and .0023.

What heads are we talking? Thanks
14 apache is offline  

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

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.