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Re: 340 running hot (long) [Re: Challenger 1] #743222
07/09/10 12:05 AM
07/09/10 12:05 AM
Joined: Jan 2003
Posts: 27,444
So Cal
autoxcuda Offline
Too Many Posts
autoxcuda  Offline
Too Many Posts

Joined: Jan 2003
Posts: 27,444
So Cal
Quote:

Quote:

I can't believe you ran that poor thing at that thing of a speed for so long.
It puked a rod because it wanted some time off.




That is a unbelievable story there, Wow. I believe you, I bet it ate some gas along the way.




I have almost every gas recipe from 94 until now! About 13 mpg on the open highway. Some tanks 14-15mpg on a few trips when the hone job was fresh. When I drove it 40 miles each way to work through L.A. to Thousand Oaks it was about 11 mpg. That was 1999-2002. Lot of stop and go coming home (1 hr and 1.5hrs Friday).

I probably would have lasted longer if the pan didn't get sucked dry at Willow Springs Raceway 3 years ago. Took 45 min of cool-down for the oil pressure to resume.

I personally built it in a special enviromentally controlled space. While I listened to a sea of helicopters following OJ Simpson down the Santa Monica freeway...




Back on topic...

I really think that hand picking and scraping the scale off every bit inside the blocks cooling passages made a big difference!!! My dad spend a good 6-8 hours just scraping the inside of the water jackets. I just spends 3 hours doing the same on a much cleaner block. I don't think most machine shops are going to do that. Unless you wanted to pay them $400 extra just for that.

I also think that body design may be more significant than we think. 67/68 Barracuda have big unobstructed grille openings and valance opening under the grille. I just don't have a good way of measuring or comparing that.

I used to worry when the faster I went, the temp gauge would drop from it's normal resting place that the t-stat would keep it at. I mean when I started on a blast to 4200 rpm or something the temp needle would drop a full gage tick/mark. Worse when the motor was fresher (newer bubble gum holding it together).

Last edited by autoxcuda; 07/09/10 12:18 AM.
Re: 340 running hot (long) [Re: autoxcuda] #743223
07/09/10 08:07 AM
07/09/10 08:07 AM
Joined: Feb 2003
Posts: 607
NY
old340dog Offline
mopar
old340dog  Offline
mopar

Joined: Feb 2003
Posts: 607
NY
My new 340 rebuild runs around 200. I found that when it hot outside it creeps up to around 205-210 while driving. I've got a new rebuilt radiator, 195 thermostat,clutch fan, eddy heads and mild cam.Others have told me it will the temp will cool down some as the motor gets more broke in.I've got around 600 miles on it right now.


old340dog
Re: 340 running hot (long) [Re: old340dog] #743224
07/09/10 08:15 AM
07/09/10 08:15 AM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
Too Many Posts

Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Quote:

My new 340 rebuild runs around 200. I found that when it hot outside it creeps up to around 205-210 while driving. I've got a new rebuilt radiator, 195 thermostat,clutch fan, eddy heads and mild cam.Others have told me it will the temp will cool down some as the motor gets more broke in.I've got around 600 miles on it right now.




I respectfully disagree, I have rebuilt many motors and have never seen them run cooler as they age.

You should be running a 180 thermostat IMO.

Re: 340 running hot (long) [Re: Challenger 1] #743225
07/09/10 05:19 PM
07/09/10 05:19 PM
Joined: Jan 2003
Posts: 541
chatham, Ilinois
F
fox Offline
super street
fox  Offline
super street
F

Joined: Jan 2003
Posts: 541
chatham, Ilinois
Check the air fuel ratio and the timing.
They both have an effect on temp.!

I had one that ran very well, but got hot on the highway. Cooled off in town!!!!!
It was very lean. edelbrock perf carb, and smaller rods made a big difference. It ran 180 all the time, even with air conditioning running.

Re: 340 running hot (long) [Re: fox] #743226
07/22/10 01:40 AM
07/22/10 01:40 AM
Joined: Apr 2009
Posts: 162
southern illinois
O
ozz383 Offline OP
member
ozz383  Offline OP
member
O

Joined: Apr 2009
Posts: 162
southern illinois
ok finally got back yo working on the demon installed new auto meter mechanical guage and test ran it in garage and it looks like it is going to be alot different in the readings just over 180 when it was closer to 215 with other guage looks like the other guage was way off!!will try to get it out on the road in the next couple of days if the rain will hold off so i can get an accurate test but it looks promising as of now will keep you posted on it . thanks for the help ozz

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