HOT PLUGS

[Keith Seiwell]

Hello All. I have a 65 roadster with a 327/350. Just completed a body off resto and it was a success thanks to this board. New problem. My vette is 2xweek driver. I only drive it around 10 miles total. Recently, the engine began to run rough as if a spark plug came off. I pulled the plugs and they were all fouled. The problem I have been told, is that the engine does not get up to operating temperature, and that gasoline additives will increase the chances of fouling. I have heard that this is not uncommon with mid year 327's, and the answer is to go to a hotter plug. What do you think? How hot should I go (I am running with R 45's). Is there an R 46? Should I stick with AC Delco or go to a "Bosch" platinum plug that supposedly is maintenance free? Your advice, as always, is very much appreciated. KAS

[Dave]

Re: HOT PLUGS

Hello Kieth I run 44s or (equivalent Champion) uj12yc plugs in my 66 driver. They are extended tip versions of the 44 plugs that came with the car. I'll guess that your choke isn't lean enough, or your heat riser valve is toast. I've had heat riser valves crack off internally, and they (externally) appear to be working. Try a leaner choke and extended tip plugs. Don't overload your coil with resistor plugs AND resistor wires. - Dave

[Rob Brainard]

Re: HOT PLUGS

Keith, If I read your message correctly, you drive your car 2 times a week for a total of 10 miles - each trip totals 5 miles, broken down into two trips, 2 1/2 miles each. IF I am correct, your car NEVER gets up to NORMAL operating temperature. The choke is probably just opening up completely when you shut the engine off. AC45 plugs are just fine for your car. Changing plugs and adjusting the choke are just an attempt at masking the problem which is your driving habit. In your case you have two options: 1. Start your car earlier and let it warm up to operating temp., so that when you drive your 2 1/2 miles it is not a warmup drive. 2. Change your route to wherever your going so that you can clock up 7 to 10 miles. As of now, all you are doing is what is called "cold' starts. Cold starts are the worst thing that can be done to an engine's internals [wear]- forget the replaceable plugs.