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302 timing change when hot
#1
Hey All, 1st post, Im having a problem with my 1973 Conv, I have a 191 degree thremostat and the temp goes up to 210-220 after driving for about 45 min. (I've never let it get any higher) As I get off the freeway and drive around town I have a very noticable ping when I accelerate. (Timing ping) until the engine cools down. However it never pings when its cold or with the temp going up, The car runs great.
Any body else ever heard of this or anyone have an idea on what to work on???

Thanks in advance
Ted
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#2
Try retarding your timing just a hair. Without knowing what build you have, could be low on octane also. The temperture issue is a unknown. Be aware that coolant under pressure does not "boil" at 212 degrees. That being said. Did you just rebuild your engine? Paint it? And lastly. What was the "normal temperature before ? Look forward to hearing from you.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#3
markmel;33304 Wrote:Try retarding your timing just a hair. Without knowing what build you have, could be low on octane also. The temperture issue is a unknown. Be aware that coolant under pressure does not "boil" at 212 degrees. That being said. Did you just rebuild your engine? Paint it? And lastly. What was the "normal temperature before ? Look forward to hearing from you.

I Just have a standard 302, V2 I think it was rebuild previous but I dont really know. The only thing I have done to it is replace the left side head gasket. and had it painted (Exterior) When I had a 160 degree thermostat in it seemed to run cooler. I also recently replaced the Carb, manifold and distributor and put in electronic points. The car runs really good when its cold but when it heats up is when I have the timing prob. I'l try to retard the timing and let you know. What is the "Normal" running temp supposed to be? My truck (2007 Chevy) runs at about 210 normally.
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#4
welcome The normal temp is dependent on your thermostat and coolant mix. Pure water will behave the same way as pure coolant/antifreeze and tend to run hot. 50-50 is typical. Was there a reason you put in a 190 deg? I think it originally came with a 180 deg.
BTW why don't you go and put a post in the introductions forum so the group can give you a proper welcome. Hope this helps.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#5
Just took the 73 out on the hwy after readjust the timing, no go. the temp still went up to 230, within 15 min of driving at 70-75, and the pinging was still there. When I shut it down, the gage went past 250 and the car wouldnt start. I let it cool down and after readjusting the timing it started without a prob. The temp went back to 200-210 and I drove around town and did some erands, no probs. The car never "Overheated" per-say but I did have some fluid in the overflow. I hate that I cant take it on a road trip.
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#6
What kind of fan are you running. If it is a clutch fan have you checked that?
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#7
Tnfastbk;33325 Wrote:What kind of fan are you running. If it is a clutch fan have you checked that?

It is a 5 blade fan w/o a clutch
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#8
tndt1;33327 Wrote:
Tnfastbk;33325 Wrote:What kind of fan are you running. If it is a clutch fan have you checked that?

It is a 5 blade fan w/o a clutch

Have you checked temps at the top and bottom hoses for actual temps? to rule out the gauge and make sure the radiator is doing its job?
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#9
Tnfastbk;33328 Wrote:
tndt1;33327 Wrote:[quote=Tnfastbk;33325]
What kind of fan are you running. If it is a clutch fan have you checked that?

It is a 5 blade fan w/o a clutch

Have you checked temps at the top and bottom hoses for actual temps? to rule out the gauge and make sure the radiator is doing

No I haven checked the actual temps yet, but I know that its very hot LOL
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#10
The pre-ignition is occurring because of the excessive engine temperature. If the Ported Vacuum Switch is still operational it will advance the timing when the engine gets hot to increase engine speed and therefore fan speed in an attempt to cool the engine down. What symptoms were present that caused you to change the head gasket? Did it get too hot after you changed the head gasket or only after you changed the thermostat? What is initial and total timing now? Is the fan shroud in place? Is the lower radiator hose collapsing when the engine gets hot? Chuck
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