Breakfast run Friday the 14th

[mikiec]

Go to Mikes... With a name like that it must be great. LOL

[DWRAT]

We had a great ride today.
Started out with Scotty, Jim, Bob, Bruce & myself.
Ended up at St Mikes hotel missing Bob & Bruce.
We said lets eat and well head back and look for them.
30 minutes later they showed up, no problems to report.
I thought they both had V-8's but maybe not.
Thanks for going everyone, I had a nice time.

[Bob Broberg SPF667 460BB]

It was a good run as long as you like driving the speed limit from Wilhoit to Prescott. Long lines of cars going putt...putt. Them thar young Whipper-Snappers (Dan, Scott & Jim) done drove away from us growd ups (Bruce and me.)
http://tinyurl.com/z6ebugs

AZ Bob

[moore_rb]

and, as I spent the morning laying on my driver's seat upside down, with my head up in my pedal box disconnecting my clutch pedal and unbolting the MC, all I could think about was how much I hate you guys....

[Phx Mike]

Originally Posted by moore_rb

Correct- If you change the bore size on the clutch MC, it changes the length of travel in the slave cylinder rod, as well as changing the clutch pedal leverage ratio.

For that reason, I'm going to swap like for like parts.

One thing I will do is use Dot4 fluid when I refill and bleed the system.

But I'm really bummed that I'm going to miss the Prescott run.

David told me to use Motorcraft Dot 3 in my brakes due to higher boiling point and that's what is in my clutch also. Not sure what all the differences are between the fluids

[Karl Bebout]

Phx Pike, before I bought a quart of Dot 4 to flush my brakes, I looked at several brands and types. Pretty sure the same brand in DOT 4 had a higher boiling point than their DOT 3. Did I get it backwards? Wouldn't be the first time.

[Bob Broberg SPF667 460BB]

Dot 3 is $5.99 a quart and Dot 4 is $7.99 a quart. You guys change your brake/clutch fluid often enough AND you don't race on a track so Dot 3 is just fine. Dot 4 can handle higher temps as we all know. Dot 4 can be used to replace Dot 3 in all cases but not the reverse IF your Mfr recommends Dot 4.
Dot 5 is for LeMans.
AZ Bob

[Phx Mike]

Sorry for hijacking the thread, and as an engineer by training I should have known better and been more specific. I was referring to the dry boiling point. DOT ratings are based on wet boiling points and in that regard DOT 4 is superior. Motorcraft DOT 3 has a dry boiling point of 500F vs 460F for DOT 4. Being in AZ with little condensation and that we change fluid pretty often the dry spec is probably more relevant but then again I am not sure 40F makes much difference at least given normal driving conditions!

[Phx Mike]

Originally Posted by moore_rb

and, as I spent the morning laying on my driver's seat upside down, with my head up in my pedal box disconnecting my clutch pedal and unbolting the MC, all I could think about was how much I hate you guys....

And I spent the day at work! Sounds like it was a great run....wish I could have gone.

[moore_rb]

I prefer DOT4 for the clutch, because it is pure synthetic and has the lowest total compressibility, which is important in a clutch that uses an external piston driven slave cylinder; because the piston travel is effectively doubled between the MC and the SC...

But honestly, I agree with Bob- When you flush your brake lines often, either DOT3 or DOT4 will do just fine.

[Phx Mike]

Good point...

[Car Nut]

Valvoline Dot3/4 Synthetic brake fluid is all I use anymore. It mixes with mineral based fluid, is synthetic so it doesn't immediately attack your paint if you spill it, and is reasonably priced.