My Tuning Adventures

[Spikedog08]

You're running a thermostat, right Jas? Usually I've heard that not having one causes the coolant to go through the system so fast that it doesn't have time to properly cool a bit. Clutch fan? Clutch working properly? Shroud? Fan belts tight enough? Late timing? I've pretty much run out of ideas here. 

Make sure you have a spring in your lower radiator hose . . shouldn't run hotter on the highway . .

[70 Challenger Lover]

Don't be afraid to try out the little shooter nozzles too. They are cheap and easy to switch out with the carb on the car. I have found that sometimes, going up a size on the nozzles can make a big difference on performance and curing stumbles or lean spots. Playing with them along with the pump cams makes the tuning process easier.

[Cudajason]

You're running a thermostat, right Jas? Usually I've heard that not having one causes the coolant to go through the system so fast that it doesn't have time to properly cool a bit. Clutch fan? Clutch working properly? Shroud? Fan belts tight enough? Late timing? I've pretty much run out of ideas here. 

Make sure you have a spring in your lower radiator hose . . shouldn't run hotter on the highway . .

Yep have a spring in there.

No thermostat in there, tired with and with out.  I will go back to a t stat for the summer.  It has not been a issue in the cool weather.

Don’t be afraid to try out the little shooter nozzles too. They are cheap and easy to switch out with the carb on the car. I have found that sometimes, going up a size on the nozzles can make a big difference on performance and curing stumbles or lean spots. Playing with them along with the pump cams makes the tuning process easier.

Yeah that's my plan. I am going to pick up a few sizes up a and down from the 31 that is in there now, then try them out in the spring. 

Jason

[HP2]

A t-stat or restrictor plate is usually needed to slow down the coolant flow enough to get effective heat transfer. The increased pump speed that goes with increased road speeds could point to the rising temps at highway speed.

[Cudajason]

While I sort out my cooling issues...see this thread:

https://forum.e-bodies.org/engine-transmission-and-rear-end/4/trying-to-stay-cool/22554/

I thought I would play with the carb.

A while ago I installed a 1 inch spacer to help keep the heat from the carb.

I have tried several pump cams and the all work ok, so I thought I would check what size pump nozzle I had in there. To my surprise it was a 37...Yes a 37!  I do not remember putting that in there.

See the pic below. I put a 28 back in, and man did it wake things up.

Nice snappy part throttle response, like it was before the spacer. Full throttle had a good hesitation, felt rich so I switched to the while cam, one step smaller.

Take it out tomorrow to see how it works.