Break in time for a new 928 engine?
04-16-2007, 10:40 PM
#1
Rennlist Member
Thread Starter
Break in time for a new 928 engine?
Ive done this a few times, but scot is listening to the shop saying that he should run the car for 500miles before a dyno. since we are talking stock stuff here, and new bearings, how long do most shops wait before dyno time. Ive already taken the car to 5000rpm and it has about 30 miles on it now. I say, LETS GO, scot is watching the odometer.
any comments? i say 4-5 heat cycles of the engine and things are pretty worked in . the rings dont seat like a chevy, so what would be the breakin procedure? my 5 liter part euro was driven to 250 miles to tahoe and back, then the dyno and then a 200mile drive to the track for its first race!
mk
any comments? i say 4-5 heat cycles of the engine and things are pretty worked in . the rings dont seat like a chevy, so what would be the breakin procedure? my 5 liter part euro was driven to 250 miles to tahoe and back, then the dyno and then a 200mile drive to the track for its first race!
mk
04-16-2007, 11:24 PM
#2
Race Car
Not entirely trying to be the wiseguy, but... The correct break in time for a new 928 engine is whatever duration is required to make the owner of the car comfortable/satisfied that it was adequate.
04-16-2007, 11:30 PM
#3
Rennlist Member
Thread Starter
who side are you on? as the builder of all of his engines 
i think the break in time is one that makes sense for properly seating the engine components. Ive heard the devek and others run the car on the dyno for about a half an hour before they do a power run. ive heard the factory does full throttle full rpm runs right after assembly. If that is true, what the heck is the risk of 3 runs to 6000rpm at full throttle???
mk
i think the break in time is one that makes sense for properly seating the engine components. Ive heard the devek and others run the car on the dyno for about a half an hour before they do a power run. ive heard the factory does full throttle full rpm runs right after assembly. If that is true, what the heck is the risk of 3 runs to 6000rpm at full throttle???mk
Originally Posted by James-man
Not entirely trying to be the wiseguy, but... The correct break in time for a new 928 engine is whatever duration is required to make the owner of the car comfortable/satisfied that it was adequate.
04-16-2007, 11:48 PM
#4
Race Car
Originally Posted by mark kibort
who side are you on?
mk
mk
The owner of a company can run it any way he pleases, against and despite the best advice from the best of industry experts.
I kinda agree - I don't see the harm in three dyno pulls on a warm engine. But I don't own the the car, so it is really the owner's perogative.
It isn't fun when people don't take advice. You don't have kids, do you Mark?
04-17-2007, 12:21 AM
#6
Rennlist Member
Thread Starter
oh yeah, i have 2 boys, terrible 2s and 5 years old. Heck, they did most of the bolt turning on Scots engine!! (dont tell scot!) I did the torque wrench.
I spent a few weekends over the winter building this thing up for scot.
mk
I spent a few weekends over the winter building this thing up for scot.
mk
Originally Posted by James-man
When it is you and YOUR car, I will root for you.
The owner of a company can run it any way he pleases, against and despite the best advice from the best of industry experts.
I kinda agree - I don't see the harm in three dyno pulls on a warm engine. But I don't own the the car, so it is really the owner's perogative.
It isn't fun when people don't take advice. You don't have kids, do you Mark?
The owner of a company can run it any way he pleases, against and despite the best advice from the best of industry experts.
I kinda agree - I don't see the harm in three dyno pulls on a warm engine. But I don't own the the car, so it is really the owner's perogative.
It isn't fun when people don't take advice. You don't have kids, do you Mark?
04-17-2007, 01:13 AM
#7
Former Vendor
Mark:
We try and run them for an hour or so in the shop, through a couple of heat cycles before we beat on them on the dyno. She's ready to go right now, as far as I'm concerned.
gb
We try and run them for an hour or so in the shop, through a couple of heat cycles before we beat on them on the dyno. She's ready to go right now, as far as I'm concerned.
gb
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04-17-2007, 08:22 AM
#9
Rennlist Member
04-17-2007, 09:52 AM
#11
Race Car
Originally Posted by mark kibort
oh yeah, i have 2 boys, terrible 2s and 5 years old. Heck, they did most of the bolt turning on Scots engine!! (dont tell scot!) I did the torque wrench.
I spent a few weekends over the winter building this thing up for scot.
mk
I spent a few weekends over the winter building this thing up for scot.
mk
Engine building in one's jammies has gotta be worth at least an extra 10hp.
I had no idea that you had kids. With your involvement in multiple competitive activities, I don't know how you manage to keep up.
04-17-2007, 02:14 PM
#12
Rennlist Member
Thread Starter
Thanks! nice to see some of the things ive heard, in writing.
Mk
Mk
Originally Posted by SwayBar
04-17-2007, 02:16 PM
#13
Rennlist Member
Thread Starter
Thanks Greg,
I was hoping you would chime in. I didnt want to bother you with more questions, as you have been a huge help through our process of building his engine. looks like we have a ripper! hope it stays together!
Off to the dyno next week after he has some body work done.
MK
I was hoping you would chime in. I didnt want to bother you with more questions, as you have been a huge help through our process of building his engine. looks like we have a ripper! hope it stays together!
Off to the dyno next week after he has some body work done.
MK
Originally Posted by GregBBRD
Mark:
We try and run them for an hour or so in the shop, through a couple of heat cycles before we beat on them on the dyno. She's ready to go right now, as far as I'm concerned.
gb
We try and run them for an hour or so in the shop, through a couple of heat cycles before we beat on them on the dyno. She's ready to go right now, as far as I'm concerned.
gb
04-17-2007, 03:03 PM
#14
Drifting
Originally Posted by SwayBar
04-17-2007, 03:23 PM
#15
Rennlist Member
Mark,
Marc Thomas posted his break in procedure on our local board awhile back when the topic came up there, sounds like you're ready to roll:
----- Original Message ----- From: Marc Thomas
To: PacNW928@yahoogroups.com
Sent: Monday, May 24, 2004 10:37 PM
Subject: [PacNW928] Break in
My procedure - run the engine for 20 minutes, 5 mins at 2000, 4 mins at 3000, 3 mins at 4000, 2 mins at 5000, 2 mins at 6000, 5 mins at idle...shut it down, cut open the filter and evaluate, replace filter and go drive the 928 for about 100 miles going up and down the revs, at both full and partial loads....and then hit the dyno!
Keep in mind that my ring seal is 98% or better before the engine even turnsover...
Most of the break in period is for bearing, piston, lobe and ring "fittingand polishing" and that occurs in short order.
Porsche does a 30 minute break in period at both peak torque and peakhp...at least they did when they built the 928s.
Marc
DEVEK
Marc Thomas posted his break in procedure on our local board awhile back when the topic came up there, sounds like you're ready to roll:
----- Original Message ----- From: Marc Thomas
To: PacNW928@yahoogroups.com
Sent: Monday, May 24, 2004 10:37 PM
Subject: [PacNW928] Break in
My procedure - run the engine for 20 minutes, 5 mins at 2000, 4 mins at 3000, 3 mins at 4000, 2 mins at 5000, 2 mins at 6000, 5 mins at idle...shut it down, cut open the filter and evaluate, replace filter and go drive the 928 for about 100 miles going up and down the revs, at both full and partial loads....and then hit the dyno!
Keep in mind that my ring seal is 98% or better before the engine even turnsover...
Most of the break in period is for bearing, piston, lobe and ring "fittingand polishing" and that occurs in short order.
Porsche does a 30 minute break in period at both peak torque and peakhp...at least they did when they built the 928s.
Marc
DEVEK
