eating rod bearings??
- Thread starter LOYTOY
- Start date
L
Linc
Active member
What's your A/F, just because you run good fuel doesn't mean you're running enough fuel. Also you can take out the motor in the mid range just a easily as at WOT. Make sure your A/F's are good through out the throttle range, I say throttle range, not RPM, because it's the throttle position, that determines how much fuel it gets, not RPM.
hows the piston look?? Any sign of detonation? I'd check the crank for cracks if you have taken out more than 1. Have that crank magnafluxed and mike that journal for clearance ect.... Did you resize the rod after the first problem? I assume you are running Carillo rods at that boost level??
Why is Carillo rods necessery @ 17lbs?
I, and more with me, run higher then that with stock rods!
How many stock rods have broken if the bearing hasen't siezed?
I heard of none!
Thats pretty good news about stock rods....
Jan, I built sprint car motors for 20 years and most all rod failures from spun bearings come from the big end going out of round under load, most all just jump to the conclution that its lack of oil, but the big end deforms and pinches off the clearance at the parting lines. We even go so far as to run special rod bearings with more clearance (+.001) at the parting lines, they are in effect "egg shaped" until they are under load, then they go round.
IMHO why not put the best rod and piston possible in a boosted motor? Carillo goes to great lenghts to make the big end as strong as possible to resist any bore deformation.
Is it a Apex or rx1? Because the rx1's won't shut down with low oil pressure or lack of oil whenthe Apex will. Have you made sure all your oil lines are not kinked in any way.
I'm not concerned about the stock rods failing. I think they are fine. I am concerned about the stock rod bolts. If a rod bolt fails your just as bad off as breaking a rod. That's the main reason I run Carillos. The Carr rod bolts are the bad a**.
I'm not concerned about the stock rods failing. I think they are fine. I am concerned about the stock rod bolts. If a rod bolt fails your just as bad off as breaking a rod. That's the main reason I run Carillos. The Carr rod bolts are the bad a**.
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N
NM
Well-known member
Is it possible that you are running to much octane? I have been running a 50/50 mix of c-12 and premium for over 2 yrs and not one issue in 5000 kms. I have 10:1 Wiseco pistons and Carrilos. I tried strait c-16 at 20 lbs once and the sled ran like crap...went back to the original program and picked up huge speed. I just had another buddy switch to my program after running strait c-16 for a year. He used to run 22-24 lbs boost and now his sled is way faster at 17 lbs boost with a 50/50 blend.
L
LOYTOY
Member
I heard you talkin about that to the big guy last weekend neil. Think I'm going to take the motor to chuck and see if he can figure something out.
Is it possible that you are running to much octane? I have been running a 50/50 mix of c-12 and premium for over 2 yrs and not one issue in 5000 kms. I have 10:1 Wiseco pistons and Carrilos. I tried strait c-16 at 20 lbs once and the sled ran like crap...went back to the original program and picked up huge speed. I just had another buddy switch to my program after running strait c-16 for a year. He used to run 22-24 lbs boost and now his sled is way faster at 17 lbs boost with a 50/50 blend.
This is why i read alot on this forum, thanks for the info, one more thing learned.
My plan is to do some internal work to the engine when the snow dissapears, because i want to have some more power, i might lower the boost a tad until then.
L
LOYTOY
Member
My RX1 shuts down if the oil level is too low. Gives you a warning light for 15 seconds or something then shuts off.
