Just curious. Why not shot peen?

The rods and rocker arms are already polished so there are no surface imperfections that need to be corrected.

The crank was also in perfect shape so it just polished the journals and gave it a good washing.

I got a question for you Jack, when you flow test heads are you sucking the flow through in the right direction when testing exhaust flows or do you get your numbers from pulling the flow into the combustion chamber?

Flow is tested by sucking for intake and blowing for exhaust.

As to shot peening. It should be done after polishing, see tech article on Metal Improvement site for why. The peeing puts the metal under compression therby preventing propagation of any cracks. It is especially important to the radius edges of the crank throws and all of the connecting rods. Thats what Porsche does to stock S rods and racing cranks.

Hmm, the reason why I ask about the flow method is because I got done testing my exhaust flows and got a lot larger numbers than you posted in another thread.

Here is a graph of the flow numbers I got today from my tests. Unless my flow rig is leaking or setting up some strange turbulence they seem a bit high.

http://forums.pelicanparts.com/uploa...1114998115.gif

Speaking of my flow rig I took a few pics of the pieces I made to test the exhaust ports and manifold.

I tested one manifold port today and got a flow of 362 CFM which appears to gist with the other ported carrera manifold numbers I found on the board.

Here is a pic of the setup for testing the exhaust port . . .
http://forums.pelicanparts.com/uploa...1114998995.jpg

And my device for precise exhaust valve control . . .
http://forums.pelicanparts.com/uploa...1114999069.jpg

And a pic of one of my exhaust flow tests in progress . . .
http://forums.pelicanparts.com/uploa...1114999116.jpg

And here is one of my manifold testing set up . . .
http://forums.pelicanparts.com/uploa...1114999169.jpg

Several things are wrong about your setup.

1. Always have the spark plug in place.
2. Always have a simulated cylinder or actual cylinder attached to the head. The cylinder and head shrouds the exhaust port, a lot.
3. Sucking thru the exhaust may not be exactly the same as blowing thru it from the cylinder. For sure the flow is directional and a vacuum situation inside the cylinder probably isn't the same as a large volume of air blowing thru. I haven't looked at it very closly on an analytical basis, but I have seen the difference in actual tests. A commercial flow bench allows the easy reverse of air flow so there was no reason to check out the real reasons for the difference, I just checked to see and wallah, there was a significant difference.

ONly trying to help on the peening thing, I want you to get the best possible results, esp seeing all the very innovative work you have put into your engine. I have been an engineer for over 35 years and seen a lot of work by very talented people, you are way up there on the talent level, keep up the good work.

PS do a check on leakage, ie valves closed, check flow. Another sanity check, the exhaust will almost ALWAYS be less than the intake flow, esp because the exhaust valve is always smaller than the intake valve. And if that flow is more than 80% of the intake, be suspicious. 91% is not likely nor even desirable.

Well, I haven't had a chance to get back to my flow tests, but operation case bling bling is now complete.

http://forums.pelicanparts.com/uploa...1115176304.jpg

http://forums.pelicanparts.com/uploa...1115176706.jpg

http://forums.pelicanparts.com/uploa...1115176718.jpg

Wow , the bling is very much BLING BLING. How did you do it? Cool.

Way too much intensive labor involving power tools and abrasives. The most helpful of all the tools was a dremmel tool with a scotch brite like buffer on the end. I would guess the total time is well over 10 hours if I include the initial cleaning and deburring of the case.

I still have to pull the main oil galley plug and give the case a final cleaning but then it will finally be ready to put back together.

Its a nice change compared to the grey and grimy case I started out with. I will probably cry the first time I have to drive the car in the rain.

http://anthonyrawson.com/Cars/Engine...crossFloor.jpg

dude, those are the best looking cleanest cases I've ever seen. I thought I had mine looking good.

http://www.pelicanparts.com/support/smileys/clap.gif

Well, they looked so good after the initial cleaning and wire brusing I decided to go all the way. They are not super shiney, more like somewhere between brushed and polished.

You need to wax the case with a good polish to try and keep the aluminum from going to **** and coroding. This thing is not going to be fun to keep clean at all. You need to get yourself a bottle of Mr Buffer polish. It is the best stuff I have ever used by far. It will make your life much easier. The shine will come up with this as well. I can show you where to get it. He is a local guy who does all my polishing.

Eric

You've got too much time on your hands.

I have a muffler that appears like the one you have pictured with a 4" single outlet. Mine is just a shell, nothing inside at all. How is yours configured?

Its almost an empty shell, but the exit pipe fully extends into the canister and is slotted over its entire length. Very much like an internal supertrap system.

Well, during the last few days I have taken most of the tranny apart. Tomorrow I will be removing and breaking down the gearset.

Here are some pics of where it currently stands. I am suprised that everything is as grungy as it is. It must be the florida humidity.

http://forums.pelicanparts.com/uploa...1115437508.jpg

http://forums.pelicanparts.com/uploa...1115437527.jpg

Hmm, I must have had a flow leak or calibration errors on the above graphed exhaust flow tests since after testing all the heads I am only getting about 195 CFM @ .4" of valve lift which makes sense when comparing valve sizes, port lengths and assumed boundry layer thicknesses.

Unfortunately I am getting around an 8% flow difference between the worst and best flowing exhaust port so I guess I will be looking for the causes and trying to rectify them this week. As soon as I am done with lunch I will be checking all the manifold port flows to see if there is anything I need to tweak on them too.

I am also pleased to see that I am just a few views away from having the most viewed thread on the 911 engine rebuilding forum. Take that reringing alusils. :D

Have you flow tested your entire carrera intake? Did you see big differences between runners? Looks great Tony!

Uh-oh. Look who has the lead in the views race...

Yaaay, I'm winning big time. :D

Yup, I just got done tonight and here are the results.

The deviations from the average flow are the following.

#1 0.3%
#2 3.4%
#3 0.9%
#4 -2.2%
#5 0.0%
#6 -2.5%

Here is a chart of the numbers.
http://forums.pelicanparts.com/uploa...1116213971.gif

I also set up an excel spreadsheet today to calculate some speed -vs- rpm charts for my new gears. Here are the charts for those who might find them interesting.

http://forums.pelicanparts.com/uploa...1116211835.gif

http://forums.pelicanparts.com/uploa...1116211855.gif

350Hp930,
I was looking at your stock versus modified gear charts. Are you just changing the R&P?