How hot is too hot?

[Ritzy1]

What is your rear end ratio

See post #9

 

[Vintage Copper 47]

T-5 trans., 2.73-geared Ford 8.8, 235/65R16 tires. Thinking I may need to change to a 3.08 to get it more in the engine's power band on the highway.

That would be a great combo for my 47 flathead SIX.. I would love to have a T-5 with parallel leaf springs in the rear!

 

[Sid]

Yup, 2,380 RPM @ 70 MPH in 4th. Right on. It did tick up to 205 on both heads again, but dropped fairly quickly when I slowed a bit. May need to fatten it up.

What is the temp.you are driving in? Is there any chance a belt is slipping?

 

[Ritzy1]

What is the temp.you are driving in? Is there any chance a belt is slipping?

Funny you should mention that Sid! I did notice that the belt had indeed loosened up past spec, so I tightened it up to have the 1/2" of deflection it should. It didn't seem to make too much of a difference though.

I pulled a couple of plugs and they did look like it may be lean. I ran it back down to Freeman's and we put in .043 jets, then drove it back. It did get up to 205-206 on the way down, on the way back it notched 202-203, so it didn't make a huge difference yet. Temp today is about 85, so a little cooler than it has been. As soon as I slow down to 65, the temp drops below 200. I also need to check the timing to see where that's at, as I haven't done that yet.

I'm going to make a 140 mi. round trip to a show in Sturbridge, MA tomorrow, so we'll see how she does.