Spark plug question - Ford Truck Enthusiasts Forums



Spark plug question

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 03-21-2016, 04:48 PM
85lebaront2's Avatar
85lebaront2 85lebaront2 is offline
Old School Hot Rodder
Thread Starter
 
Join Date: Feb 2006
Location: Exmore, VA
Posts: 6,221
85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold
Spark plug question

I have my new engine getting ready for installation. The normal plug for the EFI 460 is ASF-42P. I have raised the compression to 9.23:1, the question is, should I drop back one heat range to ASF-32P?

Thanks!
Reply With Quote
  #2  
Old 03-22-2016, 11:05 PM
cbakker's Avatar
cbakker cbakker is offline
Elder User
 
Join Date: Mar 2011
Location: West Central Southern MN
Posts: 680
cbakker is starting off with a positive reputation.
I thought higher compression generally meant hotter combustion temps? I wouldn't be worried about that compression level anyway. My build ended up about 9.3:1, and I'm running auto lite copper 25's. I was always told the platinum plugs were a waste of Mamet, so I never ran them and have had good luck with copper. Did you rebuild your EEC-V motor?

Found this gem for plug reference:
http://www.ford-trucks.com/forums/11...parkplugs.html
Reply With Quote
  #3  
Old 03-23-2016, 07:54 AM
85lebaront2's Avatar
85lebaront2 85lebaront2 is offline
Old School Hot Rodder
Thread Starter
 
Join Date: Feb 2006
Location: Exmore, VA
Posts: 6,221
85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold
This is the short block from the donor truck, a 1990 F-250. We rebuilt that at .030 over, using the 1988-1992 pistons, a Sig Erson cam and everything balanced. The heads are a pair of F3TZs with Scorpion rockers.

The engine in the truck is the original 1986 short block with the top end of the 1990 engine. It is only maybe 8.0:1 compression as a result. The reason for asking, the VECI label for the EEC-V California models call for ASF-42P plugs, I am currently running ASF-42C plugs as that is what the 1990 spec is.
Reply With Quote
  #4  
Old 03-23-2016, 07:41 PM
Beechkid Beechkid is offline
Moderator
 
Join Date: Aug 2002
Location: Southern California
Posts: 3,870
Beechkid has much to be proud ofBeechkid has much to be proud ofBeechkid has much to be proud ofBeechkid has much to be proud ofBeechkid has much to be proud ofBeechkid has much to be proud ofBeechkid has much to be proud ofBeechkid has much to be proud of
Quote:
Originally Posted by 85lebaront2 View Post
I have my new engine getting ready for installation. The normal plug for the EFI 460 is ASF-42P. I have raised the compression to 9.23:1, the question is, should I drop back one heat range to ASF-32P?

Thanks!
IMHO, no....because there is not just the CR but the cylinder psi as well that factors into this......and the CR hasn't been raised that much really 9just enough to make it nice). This is fine for the initial start-up and break-in period since you're going to be driving it gently......

because of the unleaded gas, plug color is not going to be a good short term indicator.....once it's broken in, then I would try some gentle lugging to check for pinging.....if there's none, I would just periodically check the plugs and go have fun!
Reply With Quote
  #5  
Old 03-23-2016, 07:50 PM
85lebaront2's Avatar
85lebaront2 85lebaront2 is offline
Old School Hot Rodder
Thread Starter
 
Join Date: Feb 2006
Location: Exmore, VA
Posts: 6,221
85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold85lebaront2 is a splendid one to behold
I do plan on adding a knock sensor, my EEC-V can support it so I shouldn't risk damage. Lugging could be interesting, it's coupled to an E4OD.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
CEL After tune up WestyNaut92 1987 - 1996 F150 & Larger F-Series Trucks 2 01-21-2017 12:52 AM
Doing a tune up and research is getting confusing. buzzy613 1987 - 1996 F150 & Larger F-Series Trucks 7 05-30-2015 01:33 PM
Spark Plugs TOM86 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 5 05-09-2015 09:06 AM
Change plug wires? TFI to DSII swap annaleigh 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 2 04-27-2015 06:24 PM
Motorcraft SP502? Jermafenser Electrical Systems/Wiring 2 04-01-2007 11:26 PM


Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 01:34 AM.