Show full size 924Board.org
Discussion Forum of 924.org
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 Technical FAQ924 FAQ (Technical)   Technical924 Technical Section   Jump to 924.org924.org   Jump to PCA 924 Registry924 Registry

Hot running misfire

 
Post new topic   Reply to topic    924Board.org Forum Index -> 931 Tech.
View previous topic :: View next topic  
Author Message
924RACR  



Joined: 29 Jul 2001
Posts: 8108
Location: Royal Oak, MI, USA

PostPosted: Fri Jul 20, 2018 10:50 pm    Post subject: Hot running misfire Reply with quote

Just a quick note to say that, after driving the ('82) Turbo all week in some rather hot weather (up to 90F, including stop-n-go) I can confidently say my heat-related misfire is gone.

The heat sink on the ignition unit was key, along with finding a good/reliable ignition unit, but more than anything else re-attaching the ignition unit to the heat sink with electronics heat sink attachment paste - heat conductive, like used when assembling a CPU to a motherboard.

Night and day difference.

I also, BTW, tried some spare ignition units with a smaller heat sink, a newer style, they're riveted with a hollow rivet to something that's little more than a solid brick of metal. They clearly don't have the capacity, from my results - they would also misfire when they got all hot.

Older ignition controller, with the big finned heat sink and proper heat-conductive paste, works like a champ.

Just wanted to throw it out there for anyone having such problems.

Next up, gotta try replacing my valve stem seals... despite rebuild, seem to have a failure there, perhaps one went in poorly... going through a spectacular amount of oil at the moment...
_________________
Vaughan Scott
Webmeister
'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
Back to top
View user's profile Send private message Send e-mail Visit poster's website
ideola  



Joined: 01 Oct 2004
Posts: 15508
Location: Woodstock IL

PostPosted: Fri Jul 20, 2018 11:40 pm    Post subject: Reply with quote

Duly noted, thanks for the update...
_________________
15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    924Board.org Forum Index -> 931 Tech. All times are GMT + 11 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group