FI and long-term engine reliability
#1
Safety Car
Thread Starter
FI and long-term engine reliability
A forum such as this is the best place to get statistical data... so here's what I'd like to do:
Get compression-data (all cylinders) for cars with the S/C - doesn't matter if its auto or 6-spd. Another key parameter will be mileage driven while being FI.
The first candidate for this should be cls6sp03 as he has the most mileage with the Comptech S/C.
This could be a slight pain for some folks, but a compression-tester is like $45 and all you have to do is unplug the coils and replace one spark-plug at a time with the tester and then crank the motor.
For convention, let the cylinder #'s be as follows:
6 4 2
5 3 1 (TB--->)
(Looking from the front of the car)
Interesting data will be comrpession differences between cylinder(s) 1-2 and 5-6.
Hope you guys are interested in doing this; will be good data for everyone involved!
Ex. data:
Mileage: 10K
Cyl #1: 220psi
Cyl #2: 217psi
Cyl #3: 220psi
Cyl #4: 212psi
Cyl #5: 214psi
Cyl #6: 218psi
Get compression-data (all cylinders) for cars with the S/C - doesn't matter if its auto or 6-spd. Another key parameter will be mileage driven while being FI.
The first candidate for this should be cls6sp03 as he has the most mileage with the Comptech S/C.
This could be a slight pain for some folks, but a compression-tester is like $45 and all you have to do is unplug the coils and replace one spark-plug at a time with the tester and then crank the motor.
For convention, let the cylinder #'s be as follows:
6 4 2
5 3 1 (TB--->)
(Looking from the front of the car)
Interesting data will be comrpession differences between cylinder(s) 1-2 and 5-6.
Hope you guys are interested in doing this; will be good data for everyone involved!
Ex. data:
Mileage: 10K
Cyl #1: 220psi
Cyl #2: 217psi
Cyl #3: 220psi
Cyl #4: 212psi
Cyl #5: 214psi
Cyl #6: 218psi
#2
Spectacular Aroma About
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Are those your compression figures? Healthy! I know they can last. I know of several (Like 100 or more) '92-'94 Audi S4s with the 5cyl that are running 25+ PSI on 9.8:1 compression with 150k-250k miles. Never heard of a major engine failure on one.
#3
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I think Eric (types1976) has the most miles on his S/Cer.
and how do you expect to pull the coils off and test when the S/C'er shaft prevents you from removing them?
and how do you expect to pull the coils off and test when the S/C'er shaft prevents you from removing them?
#4
Safety Car
Thread Starter
Originally posted by Smitty
I think Eric (types1976) has the most miles on his S/Cer.
and how do you expect to pull the coils off and test when the S/C'er shaft prevents you from removing them?
I think Eric (types1976) has the most miles on his S/Cer.
and how do you expect to pull the coils off and test when the S/C'er shaft prevents you from removing them?
![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
#5
Moderator Alumnus
Generally you do not want more than a 10% difference in compression between any of the cyl's. Your at a 18PSI difference between CYL3 and CYL4. Very close to 10%.
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#9
Moderator Alumnus
Originally posted by ChucksTL
No that difference is 8 PSI.
No that difference is 8 PSI.
![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
#10
Re: FI and long-term engine reliability
Originally posted by allmotor_2000
... The first candidate for this should be cls6sp03 as he has the most mileage with the Comptech S/C...
... all you have to do is unplug the coils and replace one spark-plug at a time with the tester and then crank the motor...
... The first candidate for this should be cls6sp03 as he has the most mileage with the Comptech S/C...
... all you have to do is unplug the coils and replace one spark-plug at a time with the tester and then crank the motor...
![Big Grin](https://acurazine.com/forums/images/smilies/biggrin.gif)
Thanks for that suggestiong...
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