Normal Operating Temps for 1986 L98 Engine? - CorvetteForum - Chevrolet Corvette Forum Discussion

Notices
C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Normal Operating Temps for 1986 L98 Engine?

Reply

 
 
 
Old 08-14-2018, 06:04 PM
  #1  
kbuhagiar
CF Senior Member
Thread Starter
 
kbuhagiar's Avatar
 
Member Since: May 2002
Location: South San Francisco CA
Posts: 720
Thanked 3 Times in 3 Posts
Default Normal Operating Temps for 1986 L98 Engine?

Hello Corvette Nation,

I have a 1986 L98 engine installed in a 47 Plymouth (Turbo 350, single electric pusher fan, set to turn on at around 180-190). I have been concerned with operating temperatures. In a previous thread I asked about whether advanced or retarded timing could cause overheating.

This morning I replaced the knock sensor (I was having a problem with intermittent pinging under load). That seems to have fixed the pinging problem. Afterwards I checked the timing (after verifying TDC), it was right on 6 BTDC, no adjustment necessary.

Went out for a 10-mile test drive, combination of freeway and stop-and-go. Ambient outside temperature at the time of the drive was 92 - 95 degrees. Temp gauge stayed around 185-195 on the freeway. Stop-and go around town bumped it to around 200. Last half mile of the run is all slow speed (10-15MPH) uphill to my house, it topped up at 220, then idled in front of the house for about 20 minutes, and never got above 230. Based on how hot these engines run when installed in a Corvette, I think this is acceptable...Yes? No?

PS Temp sender is located in the factory (hottest) location, driver's side cylinder head.
Also, how long after disconnecting and re-connecting the battery will it take for the ECM to re-learn its settings?

Thanks in advance.

Last edited by kbuhagiar; 08-14-2018 at 11:23 PM.
kbuhagiar is offline  
Reply With Quote
Old 08-14-2018, 08:25 PM
  #2  
vader86
CF Senior Member
 
vader86's Avatar
 
Member Since: Sep 2001
Location: Athens AL
Posts: 49,522
Thanked 160 Times in 142 Posts
Default

Those temps are good. The ECM can relearn within just a few miles of driving.
vader86 is offline  
Reply With Quote
The Following User Says Thank You to vader86 For This Useful Post:
kbuhagiar (08-14-2018)
Old 08-15-2018, 08:41 PM
  #3  
Bfenty
CF Senior Member
 
Bfenty's Avatar
 
Member Since: Mar 2017
Location: Nashville TN
Posts: 1,287
Thanked 69 Times in 66 Posts
2017 C4 of Year Finalist
Default

Originally Posted by vader86 View Post
Those temps are good. The ECM can relearn within just a few miles of driving.
Bfenty is offline  
Reply With Quote
Old 08-16-2018, 03:08 PM
  #4  
Krusty84
CF Member
 
Krusty84's Avatar
 
Member Since: Mar 2018
Location: DFW TX
Posts: 81
Thanked 16 Times in 15 Posts
Default

You are probably fine at those temps but you may be on the cusp with that single pusher fan, especially if it is a cheap fan.

Also, temp gauge readings from the cylinder head are almost always higher than temps at the thermostat housing.

My LQ9 will show 200-225 on the dash (cylinder head sender) and only ~185-210 (OBDII) at the t-stat housing.

I was a little worried about my ride until I plugged in the OBDII scanner and realized the coolant temps were much cooler than the dash gauge reported.
Krusty84 is offline  
Reply With Quote
The Following User Says Thank You to Krusty84 For This Useful Post:
kbuhagiar (08-16-2018)
Old 08-16-2018, 10:42 PM
  #5  
kbuhagiar
CF Senior Member
Thread Starter
 
kbuhagiar's Avatar
 
Member Since: May 2002
Location: South San Francisco CA
Posts: 720
Thanked 3 Times in 3 Posts
Default

Originally Posted by Krusty84 View Post
You are probably fine at those temps but you may be on the cusp with that single pusher fan, especially if it is a cheap fan.
I don't think it's a cheap fan, it's a Derale 14", but I am working on adding a 16" puller fan on the upper quadrant of the radiator to help with cooling.
kbuhagiar is offline  
Reply With Quote
 
 
 


Thread Tools
Search this Thread
Sponsored Ads
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: