Leak down Test

[LazyBastard]

As an alternative (though this will adversely affect performance), the constriction is not needed if you wrap a towel over the filter to restrict intake, then the blower will also be a sucker.

 

[Buckeye]

eVAC SYSTEM

You don't think that would be too much suction on the crankcase and in turn suck oil into the compressor??

 

[Roadrunner]

Could it be carbon buildup causing poor ring seal ? Check out the postings by Misfit and Dukester and how Seafoam helped them with blowby by removing carbon buildup. Worth a try before tearing the engine down.

 

[jtssrx]

From what I know about turbo charging I've been told not to vent your crank case on the intake side of the Turbo Charger. You will suck all the oil out of your motor I've been told. I know I can hear air being sucked by the turbo at idle let alone under full throttle!!!!

 

[LazyBastard]

Then its a simple matter of adding a regulator. There is nothing else that will suck.

 

[Buckeye]

Roadrunner I am using Seafoam now. I need to get more miles on before I will judge it, but I don't think that will cure it. LB you may be on to something with the regulator.

 

[Sled Dog]

I have a friend who has 2 2004 RX-1's. He did a leak down test on the cylinders today. Here are the results:
Stock RX-1 with over 4000 miles Is 6% on all 4 cylinders.
Turbo RX-1 with 2700 miles: pto 20 %, #2 18 %, #3 14 %, Mag 29 %.
This is not good news for turbo owners. There is a definite ring sealing problem on the turbo sled. The higher the % the worse the problem is.
Basically what this test does is pressurize the cylinder and see how well the rings hold the pressure.
As you can see the stock motor is holding well. It should be noted that the turbo motor had no issues til after 1200 miles, that is when it started to burn oil.

Could very well be the rings are carboned up. Try running Sea Foam and do the test again I bet your friend will be happy to see the results.

 

[Mikey]

From what I have seen on this forum and correct me if I am wrong Is that some RX-1s burn oil and some don't regardless of if they are turboed or not. Isnt the question more like Why does A RX-1 burn oil? Is it the rings? Is it the valve seals? Is it something to do with oil delivery? Is it some lil stupid missinstalled seal? I for one dont have any clue why but i sure would like to know that answer Hard Facts too not some "I think its gotta be" storey. Is there anyone on this forum that is gonna do a leak down and compression test and replace thier rings if they are lower percentage or compression than spec?

 

[DYNAREX]

I believe the problem to be in the crankcase venting-as i suspected and discussed in prev posts-my leakdown hot with 2500 miles is less than 3% on all 4 and i havent added any type of ring cleaner or other stuff-just amsoil engine oil-if the crank is not evacuated properly the acidic gases and such contaminate the oil and cause "sludge" type buildup(just look at an old chevy with a plugged pcv)this sludge naturally migrates to the rings and carbonizes which in turn "binds" the oil control rings and the problem compounds itself the more the rings get stuck-my evac system has been in place for 2000 miles in one way or another-the factory system obviously is not adequate or they wouldnt have you cutting a slit in the pipe for freezeups of the line-what if the line isnt plugged enough to cause the valve cover gasket to blow out,but enough to cause a slight pressure increase in the crankcase while riding you would never know untill it was actually plugged completely and caused a problem right?

 

[LazyBastard]

How would one do a stronger evac on a stock airbox??

 

[spray25]

Has anyone noticed the new PCV type valve on the three cylinder motoer? Interesting that it got one but the 4 cylinder didn't.

 

[vcrash]

Would a compression test not show leaking rings? Buckeye, have you tried that on both sleds to see what the differances are?

 

[POWERHAULIC]

Yea spray, I noticed with great interest the crankcast ventilation system.

 

[Buckeye]

Vcrash, the sleds are a freinds in Vt. and he has not done the compression as the Leak down test is more accurate. I am not sure if a compression will show the same thing un less the ring is stuck. I do intend to do a compression on mine this week.
Ray where have you been? Busy working I hope. Have you guys noticed any heavy vapors from your crankcase vent yet? I also notice small globs of oil on the area surrounding my vent filter after an extreme high speed run(130+ on the speedo). I have a K & N filter on my vent hose, so it would take some serious pressure to push oil out of it.

 

[LazyBastard]

Would a compression test not show leaking rings? Buckeye, have you tried that on both sleds to see what the differances are?

The problem with a simple compression test is that it shows instantaneous pressure. If you crank the motor over fast enough, even with totally screwed rings, it will show good compression. Leak down is more a measure of the rate of compression loss.