Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > 911 Engine Rebuilding Forum


Reply
 
LinkBack Thread Tools Rating: Thread Rating: 4 votes, 3.75 average.
Author
Thread Post New Thread    Reply
Banned
 
snowman's Avatar
 
Join Date: Feb 2003
Location: So California
Posts: 3,787
Just curious. Why not shot peen?

Old 04-30-2005, 07:33 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #181 (permalink)
Registered User
 
350HP930's Avatar
 
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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?

Last edited by 350HP930; 05-01-2005 at 09:38 AM..
Old 05-01-2005, 07:40 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #182 (permalink)
Banned
 
snowman's Avatar
 
Join Date: Feb 2003
Location: So California
Posts: 3,787
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.
Old 05-01-2005, 05:08 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #183 (permalink)
Registered User
 
350HP930's Avatar
 
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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.

Old 05-01-2005, 05:41 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #184 (permalink)
Registered User
 
350HP930's Avatar
 
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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 . . .


And my device for precise exhaust valve control . . .


And a pic of one of my exhaust flow tests in progress . . .


And here is one of my manifold testing set up . . .
Old 05-01-2005, 06:00 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #185 (permalink)
Banned
 
snowman's Avatar
 
Join Date: Feb 2003
Location: So California
Posts: 3,787
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.

Last edited by snowman; 05-01-2005 at 09:44 PM..
Old 05-01-2005, 09:20 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #186 (permalink)
 
Registered User
 
350HP930's Avatar
 
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
Well, I haven't had a chance to get back to my flow tests, but operation case bling bling is now complete.





Old 05-03-2005, 07:18 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #187 (permalink)
Banned
 
snowman's Avatar
 
Join Date: Feb 2003
Location: So California
Posts: 3,787
Wow , the bling is very much BLING BLING. How did you do it? Cool.
Old 05-03-2005, 07:39 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #188 (permalink)
Registered User
 
350HP930's Avatar
 
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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.

Old 05-03-2005, 07:50 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #189 (permalink)
Senior Member
 
Natchamp's Avatar
 
Join Date: Jan 2001
Posts: 539
dude, those are the best looking cleanest cases I've ever seen. I thought I had mine looking good.

__________________
Mark
The Beast
mark@hargett.com
www.HargettPrecision.com
Old 05-03-2005, 07:58 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #190 (permalink)
Registered User
 
350HP930's Avatar
 
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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.
Old 05-03-2005, 08:04 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #191 (permalink)
Registered User
 
Join Date: Mar 2003
Location: Oklahoma
Posts: 2,391
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
Old 05-03-2005, 08:32 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #192 (permalink)
 
Crotchety Old Bastard
 
RarlyL8's Avatar
 
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 14,082
Garage
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?
__________________
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 05-04-2005, 10:04 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #193 (permalink)
Registered User
 
350HP930's Avatar
 
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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.
Old 05-04-2005, 05:11 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #194 (permalink)
Registered User
 
350HP930's Avatar
 
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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.



Old 05-06-2005, 07:45 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #195 (permalink)
Registered User
 
350HP930's Avatar
 
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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.
Old 05-08-2005, 09:30 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #196 (permalink)
MBruns for President
 
JeremyD's Avatar
 
Join Date: Jun 2001
Location: St. Pete, FL
Posts: 14,967
Garage
Have you flow tested your entire carrera intake? Did you see big differences between runners? Looks great Tony!
__________________
Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey
Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2
Old 05-09-2005, 08:09 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #197 (permalink)
Registered User
 
TyFenn's Avatar
 
Join Date: Nov 2001
Location: Marina del Rey, CA
Posts: 508
Uh-oh. Look who has the lead in the views race...
__________________
We can share the women, we can share the wine - Jack Straw.

1970 911t w/3.0
1971 914 w/2.0
1987 300E
Old 05-09-2005, 08:25 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #198 (permalink)
Registered User
 
350HP930's Avatar
 
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
Yaaay, I'm winning big time.

Quote:
Originally posted by Jeremy964
Have you flow tested your entire carrera intake? Did you see big differences between runners? Looks great Tony!
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.


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.




Last edited by 350HP930; 05-15-2005 at 07:27 PM..
Old 05-15-2005, 06:50 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #199 (permalink)
Forced Induction Junkie
 
WERK I's Avatar
 
Join Date: Jan 2003
Location: Wisconsin
Posts: 3,302
Garage
350Hp930,
I was looking at your stock versus modified gear charts. Are you just changing the R&P?

__________________
Dave
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 05-16-2005, 06:25 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #200 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 11:45 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2020 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.