Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by: KPower

Rebuilding head: Check out my goo

Thread Tools
 
Search this Thread
 
Old 12-19-2021, 08:35 PM
  #1  
Junior Member
Thread Starter
 
Mudflap's Avatar
 
Join Date: May 2017
Location: Louisville, Co
Posts: 466
Total Cats: 86
Default Rebuilding head: Check out my goo

So I'd love a good explanation for this one. This (following) pic shows my intake side with a stalactite of oil directly beneath the fuel injector. The issue is clearly the failed valve seal, but the oil is going UP to the injector. I've got my theory, but anyone else seen this?

config:
VVT head, original valves and valve guides (a little loose), felpro seals
ID1050x injectors
Pushing 27psi from a 6758
e85
relatively recent (2 years, 5000miles) rebuild, but didn't do the valve guides.

Note that all the other intake cylinders look alright. Also check out the gummed up injector.

Additional: I took this apart because the engine was misfiring and it was obvious cylinder 3 was the problem. It had a very wet spark plug.

Last edited by Mudflap; 12-19-2021 at 08:51 PM.
Mudflap is offline  
Old 12-19-2021, 08:48 PM
  #2  
Junior Member
Thread Starter
 
Mudflap's Avatar
 
Join Date: May 2017
Location: Louisville, Co
Posts: 466
Total Cats: 86
Default






Mudflap is offline  
Old 12-20-2021, 02:01 PM
  #3  
Senior Member
iTrader: (8)
 
Twibs415's Avatar
 
Join Date: Feb 2011
Posts: 615
Total Cats: 112
Default

Normal for e85 use. Typically running some normal pump through it cleans it. Place your injectors in some normal gas for a few mins and they will come out clean, but you should still have them tested.
Twibs415 is offline  
Old 12-20-2021, 03:07 PM
  #4  
Junior Member
Thread Starter
 
Mudflap's Avatar
 
Join Date: May 2017
Location: Louisville, Co
Posts: 466
Total Cats: 86
Default

After poking around the internet, I agree that this is exactly that - E85 residue.

But why are all 3 of the other intakes clean as a can be? Why is it only the rightmost valve of that 3rd cylinder?

Mud
Mudflap is offline  
Old 12-21-2021, 12:40 AM
  #5  
Senior Member
iTrader: (8)
 
boileralum's Avatar
 
Join Date: Mar 2006
Location: Indianapolis, IN
Posts: 1,105
Total Cats: 229
Default

Looks like maybe that injector was leaking (hence the misfire and the extra goo juice supply)
boileralum is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Raisin
Engine Performance
21
04-06-2015 03:29 PM
Tim Broughton
Engine Performance
10
04-02-2015 11:01 AM
Horton
General Miata Chat
1
04-20-2014 04:59 PM
midpack
Engine Performance
20
03-19-2012 09:06 PM
DammitBeavis
Engine Performance
9
09-07-2010 08:28 AM



Quick Reply: Rebuilding head: Check out my goo



All times are GMT -4. The time now is 10:10 PM.