expected life of a built engine - Page 2 - Perth-WRX.com

trainwrex · #11 09-10-2007, 11:29 AM

Quote:

Originally Posted by WRXTASY

Are we talking Tuna-Explicit-Ramon Spec built motors here or just your normal build ?

As above

I dont go half cocked when i finally get the ball running

JMAX · #12 09-10-2007, 11:37 AM

How long is a piece of string?

A built Group N engine with output around 140-150kw atw with 500nM of torque, running Elf WRF fuel, 24-26psi boost with a shitload of timing will last around 3 rallies, about 600-700km, before it starts feeling tired. Engine will be down on power at that point and likely hood of engine failure increases dramatically after that. This is also with a rev limit of only 5000rpm as revving it any harder is pointless with the 32mm restrictor Group N cars have to run.

End of the day it all comes to how hard you drive the car, how highly tuned the engine is and how lucky you are.

trainwrex · #13 09-10-2007, 11:44 AM

Quote:

Originally Posted by JMAX

How long is a piece of string?

A built Group N engine with output around 140-150kw atw with 500nM of torque, running Elf WRF fuel, 24-26psi boost with a shitload of timing will last around 3 rallies, about 600-700km, before it starts feeling tired. Engine will be down on power at that point and likely hood of engine failure increases dramatically after that. This is also with a rev limit of only 5000rpm as revving it any harder is pointless with the 32mm restrictor Group N cars have to run.

End of the day it all comes to how hard you drive the car, how highly tuned the engine is and how lucky you are.

yeh i understand that jonno...

i am a very unluky person

so i wont expect the world...

BOMB3R · #14 09-10-2007, 12:06 PM

Quote:

Originally Posted by BALISTC

Rule of thumb is 10-15k for a hard pushed built motor.

I'd add another 10-15k for one thats driven nicely most of the time.

Jaron is going to learn to drive nicely

Tino I am enjoying these threads mate keep them coming....

Lots of good info.

EXPLICIT · #15 09-10-2007, 12:10 PM

Quote:

Originally Posted by JMAX

End of the day it all comes to how hard you drive the car, how highly tuned the engine is and how lucky you are.

thats pretty much it right there tino. There's no set rule of thumb, BUT if you keep a high maintenance regime it will reward you. Running 1.5+ bar plus isnt an issue, pending on how hard it is driven on the road( squirts 1st to 3rd doesnt really stress it) vs real driven track time (constantly high boost pressure and high rpm combined with heat stress associated with it, will determine its life span, and as jonno rightly stated, how long is a piece of string.

97RA · #16 09-10-2007, 04:13 PM

Quote:

Originally Posted by trainwrex

what size turbo???

Everything was the standard full 2.5 drive train, so I suspect VF39. As far as I know nothing internal was touched. Only addition appeared to be a electronic boost controller.

The car was not spared the rod at all and it is still getting the same treatment.

Just amazed me that nothing went bang with all the stories of the early 257's giving way under stress. Might just be a freak engine.

trainwrex · #17 09-10-2007, 05:27 PM

Quote:

Originally Posted by 97RA

Everything was the standard full 2.5 drive train, so I suspect VF39. As far as I know nothing internal was touched. Only addition appeared to be a electronic boost controller.

The car was not spared the rod at all and it is still getting the same treatment.

Just amazed me that nothing went bang with all the stories of the early 257's giving way under stress. Might just be a freak engine.

its a pewny turbo and so only making around 200kw atw.. no stress at all. most ppl that have gone bang have much larger turbos ive seen..

trainwrex · #18 09-10-2007, 05:28 PM

Quote:

Originally Posted by EXPLICIT

thats pretty much it right there tino. There's no set rule of thumb, BUT if you keep a high maintenance regime it will reward you. Running 1.5+ bar plus isnt an issue, pending on how hard it is driven on the road( squirts 1st to 3rd doesnt really stress it) vs real driven track time (constantly high boost pressure and high rpm combined with heat stress associated with it, will determine its life span, and as jonno rightly stated, how long is a piece of string.

yeh i understand that jme.. Well ive bit the bullet, the wheels are in motion

#19 09-10-2007, 06:47 PM

dry sump kit is your answer tino!

power with reliability!

REXESS · #20 09-10-2007, 07:27 PM

700 km i would be checking the build or tune...... No matter what fuel power restrictions or boost....Think bout it....
Surely no wear maybe chunks missing to lose power????