Roush wants my Alum. FE 511 motor

csx4910 · #1 (**permalink**) 12-20-2008, 06:42 PM

Let me know how he is to work with and how it goes. Hope you get back on the road soon

Woodz428 · #2 (**permalink**) 12-21-2008, 09:18 AM

there was a 2 post exchange on the first page and after reading all the posts it was never revisted, I am interested. Do rings rotate on the piston or not?. I have always worked under the impression that if they do it is minimal, for 2 reasons 1) it would create more wear in the piston/cylinder wall and after pulling hundreds of engines down the wear is usually relgated to the top groove/cylinder and attributed to the heat/ring tension 2) the crosshatch used to seat the rings would act to prevent/restrict rotation. So which is it?? Usually the sticking is the ring sticking in the groove and not expanding on to the wall correctly.

Dominik · #3 (**permalink**) 12-21-2008, 12:18 PM

According to my knowledge, the rings do rotate. But if, or not seems to be secondary. If they stick, they can't rotate - correct. But why did they stick? Was the ring gap to small? Were the rings not plane? Out of round? Or the ring gap out of round?

Has the engine been run too cold? If Roush revvs it high at the dyno and you only cruise at 55 we are looking at vastly different operating conditions, even though the thermostat should balance that out.
However, an aluminium block dissipates heat so much better that you may experience all sorts of heat differentials in the block.

I also agree with Stentor, you should have gotten a new engine right away. Or at least an interim engine to enjoy your car over thanksgiving and christmas.

Dom

Spoooky · #4 (**permalink**) 12-21-2008, 04:50 PM

Guys,
Roush tore that motor right down to the block. I have a Shelby block. The motor was completely gone through. I know that it has new pistons, rings, ect. Beehive valve springs were also added. I have not gotten the whole list yet from Roush. When they dyno the motor, they also break it in. It is good to go when I get it. As for the temp it always ran normal at about 200 - 210 degrees. Mine was the 3rd. engine like this they built. According to Todd Andrews at Roush they have learned a lot since mine and have made many improvements which I have now. Got to get it in the car to see.

Great Asp · #5 (**permalink**) 12-23-2008, 04:26 AM

Quote:

Originally Posted by Spoooky

When they dyno the motor, they also break it in.

Wud it dyno at this time?

E

Spoooky · #6 (**permalink**) 12-23-2008, 05:12 AM

Don't have the paper work from the dyno yet. As soon as I get it, I'll post the #'s.

Great Asp · #7 (**permalink**) 12-23-2008, 11:00 AM

DAVID GAGNARD · #8 (**permalink**) 12-21-2008, 06:20 PM

Quote:

Originally Posted by Woodz428

there was a 2 post exchange on the first page and after reading all the posts it was never revisted, I am interested. Do rings rotate on the piston or not?. I have always worked under the impression that if they do it is minimal, for 2 reasons 1) it would create more wear in the piston/cylinder wall and after pulling hundreds of engines down the wear is usually relgated to the top groove/cylinder and attributed to the heat/ring tension 2) the crosshatch used to seat the rings would act to prevent/restrict rotation. So which is it?? Usually the sticking is the ring sticking in the groove and not expanding on to the wall correctly.

Yes, rings do rotate on the piston.......how much, I'm not sure, but I've seen it in a few motors I've built and later gone thru to freshen them up. some motors more than others, I have no idea why, they were all built by me the same way........

I've often wondered why automotive pistons are not made similar to outboard motor pistons, with a "pin" in the ring groove so the rings can't rotate.........

David