914-6 overheating PSA Options

[mb911]

After being involved in porsche flat 6s for 20 years now and building 400 whp turbo engines this is my 1st go around with a overheating issue I couldn't put my finger on. I felt this would be very helpful for others building a 914-6 specifically.. The car in question is a 74 that last fall I put an unknown but healthy sounding 2.7 in for @jwinner . The car ran hot last fall on his drive home but ran well. We talked over the winter and decided at least under trunk oil cooler would be necessary as the car was running 250 on 50 degree day after getting off of a 20 minute highway run. We had also talked about how the engine mount as designed sits lower then I prefer as there are no way to seal the engine tins to the chassis because of the mount positioning.. That was the 1st issue that really could not be resolved easily. The second issue was we had no idea if the carbs were set correctly or the timing..

So last week happens and he brings the car down. I remove the oil tank and discover one of the porsche fittings has a crack in it but no worries going all AN fittings on this with the oil cooler.. Then put a new used engine oil cooler on (what a bitch in the car with an amber 1 piece shroud) . I button everything up after a 3 day Marathon working session completely sore head to toe and mentally done as well.. Fire it up drive around my town for 10 minutes and runs 210 no problems..

Call James to pick up the car as its ready. He drives it home and 250 happens a few minutes from his house.. He is disappointed for sure and so am I.. Now thinking ok timing issue? Jets? Electric fan? The 74 911 factory manual says 250 is ok but we were hoping for cooler temps.. So after sleeping on it and texting back and forth James decided to take out the new appbiz engine sound pad and try that.. It fixed it.. The temps went down to 190-200 max.. Absolutely incredible as I never had a mat in any 914-6 before I thought that was crazy..

So note to self before getting all crazy with front oil coolers(though still happy to sell you the GT setup) take a look at removing the sound pad if you really are dealing with cooling issues..