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View Full Version : Cylinder leak down?


Nstigator74
12-10-2002, 08:38 PM
At what percentage of cylinder leak down (file fit rings) do you guys concider it time to freshen your motor, on a lake racer.
Infomaniac
12-10-2002, 08:58 PM
I use the leak down mainly to compare the cylinders to each other. Look for problems.
I have not run an engine long enough to wear out the rings before teardown in many years.
Nstigator74
12-10-2002, 09:08 PM
All the cylinders are within 10%, I just attained this motor and was trying to decide whether to drive it for a while, or go ahead and tear it down.
502procharger
12-10-2002, 09:53 PM
within 5% is ideal, but 10% should still be ok for a season or 2. I could be wrong but everytime i rip down a motor because of something really close to acceptable tolerances it ends up being a waist of money. the motor could have run a few hundred more hrs fine. just my 1 1/2 cents
Nstigator74
12-10-2002, 11:27 PM
I dont think it has that many hours left.....It's running a 8-71 20% over and injecting methanol
Nstigator74
12-10-2002, 11:41 PM
http://free.***boat.net/gallery/Reader_Rides/V-Drives/tn_Kurtis_motor.JPG
sorry, I don't know how to enlarge the pic.
Infomaniac
12-11-2002, 05:10 AM
Nice engine. I would be more concerned about the bottom end. Do you cut open your oil filters?
I ran mine 2 seasons. I will look at the bearings before next season. I have not had it apart since building it so I have not developed a history with this engine to feel good about running it any longer.
steve@kps
12-11-2002, 07:16 AM
Hey, infomaniac.......speaking of OIL FILTERS. Have you seen the systems1 filter? We use these filters on our race cars. Excellent filtration and it comes apart so you can inspect the filter for internal failures. Then wash it out in solvent, dry w/ an air hose, put back together, and wa-la your done. They cost about 90.00 but, well worth the investment. in my opinion.
Havasu Hangin'
12-11-2002, 08:42 AM
http://free.***boat.net/gallery/Reader_Rides/V-Drives/Kurtis_motor.JPG
058
12-11-2002, 09:57 AM
Nstigator74:
I dont think it has that many hours left.....It's running a 8-71 20% over and injecting methanol10% isn't bad, when it gets to 20% then think about freshining it up. On our TAFC we would re-ring at 20-25% but that was with a hi-helix 14-71 at 48 to 60% over.
jetaddict
12-12-2002, 02:38 PM
Dear Santa Clause. For Christmas I would really like an engine just like that one. I was a really a good boy this year.Well sort of. Sweet motor bro. :D
Nstigator74
12-12-2002, 05:26 PM
Thanks Jetaddict,and everybody else. I just hope it keeps the rods in long enough to get it freshened
smilespi
ACCEPTENCE
12-13-2002, 10:25 AM
058:
Nstigator74:
I dont think it has that many hours left.....It's running a 8-71 20% over and injecting methanol10% isn't bad, when it gets to 20% then think about freshining it up. On our TAFC we would re-ring at 20-25% but that was with a hi-helix 14-71 at 48 to 60% over.TAFC ???
Infomaniac
12-13-2002, 10:28 AM
Top Alcohol Funny Car
Do not see many of them on the lake.
058
12-13-2002, 04:34 PM
Infomaniac:
Top Alcohol Funny Car
Do not see many of them on the lake.If ya do ya better give up drinkin'
Infomaniac
12-13-2002, 05:29 PM
058:
Infomaniac:
Top Alcohol Funny Car
Do not see many of them on the lake.If ya do ya better give up drinkin'If I do I will pretend I do not have enough fuel to run