Followup C2 327/350 hot?

[John P.]

As a followup my roadster engine temp via IR gun is 200 F at idle after full warmup gauge reads close.

MityVac teed into vacuum line reads 14-15 when I Pull the trigger(release the vac) on the Mity it then reads 8.

I have not yet tested total timing though have a light and will do that.

The vacuum can on my car is a B28 i verified that.

Does the temp or vacuum seem in line? Do I have a problem? Still have to verify that the fan clutch is fully functional. On testing it by hand it seems no easier to turn fan when temp is 200 after idling vs. cold. Fan clutch an issue?

Thanks to all

[Gene M.]

Re: Followup C2 327/350 hot?

As a followup my roadster engine temp via IR gun is 200 F at idle after full warmup gauge reads close.

MityVac teed into vacuum line reads 14-15 when I Pull the trigger(release the vac) on the Mity it then reads 8.

I have not yet tested total timing though have a light and will do that.

The vacuum can on my car is a B28 i verified that.

Does the temp or vacuum seem in line? Do I have a problem? Still have to verify that the fan clutch is fully functional.

Thanks to all

If you are running a 180 thermostat that sounds about right. Maximum cooling will be when you are cruising down the highway at say 65 mph. Just sitting there at idle has little air going thru the radiator. So it stands to reason the temp will go up.

ps your car is not a roadster it is a convertible.

[Charles C.]

Re: Followup C2 327/350 hot?

Hello,
The fan clutch could be the likely cause if it is "loose when warm". Have you checked to see if the lower radiator hose is "sucking" shut when hot or collapsed internally? Original radiator hoses had a wire internally to prevent collapse of the hose. Have you used the IR gun on each side of the engine and front and back of each head?
I have not read the entire thread so if I am repeating someone else suggestions I apologize.
Chuck

[Michael H.]

Re: Followup C2 327/350 hot?

John do you know what thermostat you have in your car 180 or 195 ? The 200F sounds fine at warm up at idle, is that at the thermostat housing ?

Mike

[John P.]

Re: Followup C2 327/350 hot?

John do you know what thermostat you have in your car 180 or 195 ? The 200F sounds fine at warm up at idle, is that at the thermostat housing ?

Mike

yes it is a 180: temp i mentioned is temp today at thermostat housing. i was concerned because temp at idle a couple of days ago was 220 on the gauge. It appears the gauge is close to the IR temp. Just wondering if I have problem, or this kind of variation is tolerable.
I still have yet to recheck timing with a light, but several months ago I set it to specs.

[John P.]

Re: Followup C2 327/350 hot?

To me the fan clutch feels same resistance when cold or at 200 after idling. There is moderate resistance, But I have to admit Ive never really checked that before.

[John P.]

Re: Followup C2 327/350 hot?

is there anything other than ambient temp which would allow 20 degree engine temp variation?

[Brad V.]

Re: Followup C2 327/350 hot?

My C2 327/365 runs hot too. I'm still troubleshooting it, but I thought I would share some pdfs I collected from this forum and hope it helps.

Brad

[Rich G.]

Re: Followup C2 327/350 hot?

The tip off to me that my fan clutch was bad on my 66 327/350 was the temp at the top hose was the same as the temp at the bottom hose while at idle using the IR gun. Having said that, if you're running 200 at the thermostat housing at idle, I'd say that's pretty good.

How to explain the difference you reported in your first post? I don't know. Maybe a bad thermostat? Not fully open sometimes?

Rich

[Gene M.]

Re: Followup C2 327/350 hot?

yes it is a 180: temp i mentioned is temp today at thermostat housing. i was concerned because temp at idle a couple of days ago was 220 on the gauge. It appears the gauge is close to the IR temp. Just wondering if I have problem, or this kind of variation is tolerable.
I still have yet to recheck timing with a light, but several months ago I set it to specs.

You didn't say anything about 220 degrees in original post. Yes too high. It was suggested to check clutch fan. That is the first place to investigate. Between 180 and 200 is where I would like to see it.

[John P.]

Re: Followup C2 327/350 hot?

this thread was a followup to one from the other day, so maybe confusing.

My temp gauge showed 220 idling in traffic, maybe 3 days ago. Then today gauge and IR were 200 at idle. Maybe a few degrees cooler today, but I am really curious if something could be intermittently malfunctioning-but of course that is what makes things a challenge to decipher.

So I was wondering if anyone would be surprised at that temp variation in similar conditions-seemed odd to me. thermostat is 180 from Paragon
or Ecklers-recent.

Brad thanks for the files.

[Gary B.]

Re: Followup C2 327/350 hot?

...

ps your car is not a roadster it is a convertible.

Gene,

Educate me on the difference. I often hear people refer to their Corvette roadster.

Gary

[Leif A.]

Re: Followup C2 327/350 hot?

Gene,

Educate me on the difference. I often hear people refer to their Corvette roadster.

Gary

From Wikipedia : "Roadster is the North American term (spyder in England and a barchetta in Italy) for a 2-seater without a permanent top and without rollup windows (if it has rollup windows it is a cabriolet, not a roadster), and the windshield is bolt on rather than integrated as in modern cars." "A convertible (sometimes called cabriolet in British English) is a car body style with a folding or retracting roof (aka 'soft top' or 'top' in USA, 'hood' in UK). The collapsible roof section is typically made from flexible canvas or vinyl, although plastic, aluminium, and steel have occasionally been used in elaborate folding designs. Most modern vehicles have an electrical retraction mechanism."

[Gene M.]

Re: Followup C2 327/350 hot?

Gene,

Educate me on the difference. I often hear people refer to their Corvette roadster.

Gary

Gary, The explanation Leif gave is spot on.

[Gary B.]

Re: Followup C2 327/350 hot?

Gary, The explanation Leif gave is spot on.

Let me make a bold prediction. The use of roadster to describe Corvette convertibles is not going to decrease.

Gary