guess what happens when you go to redline

[rb25det250sx]

so just to give everyone a heads up, i will be starting my build early. i was going to use the stock bottom end, but since i spun 3,4,5 crank bearings im just going to build the bottom to. . . it will be better for me in the long run, because i will have to do it eventually anyways.

any advice/ideas i could use guys? i will pry need the help!

Thanks

[Joe]

what happens when you go to redline?

[rb25det250sx]

my car went boom.

[eh?]

I've had a 7400rpm redline with no problems hitting the limiter. Sounds like you had a preexisting problem.

[240z4u]

I am curious to hear if your oil pump drive broke.

I have been spinning well above stock redline with no problems for years. Sucks dude.

Evan

[rb25det250sx]

yeah, i was running great except for my missfire. but then i just regrounded my coils and it stopped missing. so i was ou driving around and came accross a STI and raced it. well i was out on him by a car in 4th gear, was gonna shift to 5th but decided to let it carry to redline, and there is goes.

[Joe]

my car went boom.

that has nothing to do with hitting redline lol

[rb25det250sx]

well it was fine untill i carried it out to redline. i;ve done it plenty of times, but this time it wasnt so good

[Carl H]

i've revved mine out to 8500 plenty of times before and one accidental trip to 9200...still out and about!

[CDub7]

damn 9 grand?!?!? what is the stock redline? im sorta cautious and take it up around 6-7k lol stock 25 anyways....

[Cjmartz2k]

I bounce mine off the 8k rpm rev limiter on a weekly basis for about 5 seconds heating up the tires. That didn't kill your motor, lack of oil or bad bearing clearances did.

[rb25det250sx]

yeah,i know but this time it wasnt so good when i carried it to redline.!

[yotik]

yeah, i once destroyed a prelude h22a that had pre existing valve lash issues doing that. high revs just expedite the failure.

[maryjane]

oil pumps on rbs break bc of the snout of the crank is to short.

[silviasgp06]

i really want to see if it was the oil collar issue. Pictures please! I bet it was just an oil level or bearing issue.

I still have only seen one picture proving the collar is an actual issue on RBs.

I know it makes sense to modify them, especially when revving pretty high. Just there is little actual proof besides people on forums across the world saying "the short snout will lead to failure" when Ive seen tons of proof of people driving the piss out of their RB's with no collar modification and no failure.

[rb25det250sx]

yeah i will post pics when i get the motor pulled!!

[Cjmartz2k]

i really want to see if it was the oil collar issue. Pictures please! I bet it was just an oil level or bearing issue.

I still have only seen one picture proving the collar is an actual issue on RBs.

I know it makes sense to modify them, especially when revving pretty high. Just there is little actual proof besides people on forums across the world saying "the short snout will lead to failure" when Ive seen tons of proof of people driving the piss out of their RB's with no collar modification and no failure.

[rb25det250sx]

so..anyone reccomend bottom end parts to use? i wanna go lower compression. the lowest i can find is 8.5:1

[maryjane]

eagle rods n cp pistons? weird that you ask this.......................................................................... invest your money into a good oil pumo n crank collar

[Carl H]

you want to go lower than 8.5:1?why?so the car is a total dog off boost?just to run 40psi so you can accelerate in traffic and merge?

[yotik]

you want to go lower than 8.5:1?why?so the car is a total dog off boost?just to run 40psi so you can accelerate in traffic and merge?

[meet07]

sounds like an amature.....Im wondering if he even spun a bearing..

[rb25det250sx]

no...i just asked if there was any lower. anyways thanks for the replies guys...and no i'll pry only run 25lbs.

[DrifterProdigy85]

You would have to run 8.5 CR pistons and go with a thicker headgasket. Unless you contact the piston manufacturer and have them make you a custom set. Personally i think you should taylor your compression to the gas your running. If using 93 octane then just stick with 8.5 to 9.0 CR.

[Darius]

I am curious to hear if your oil pump drive broke.

Bingo!

[rb25det250sx]

i dont think they sell 93 around here... 92 is it. but sorry for the wait guys. i havent had the time to work on it, with school just around the corner...

[Darius]

93 at the Conoco in Ames, but still that isn't going to cause bearings to spin. I'm betting that it is the crank snout rounding off and the lack of oil pressure that caused the bearings to spin if that is indeed the case. Hopefully the crank is still in good shape and can just be polished.

[rb25det250sx]

yeah, but driving an hour and a half just to get 93 is a little carried away. im hoping it is alright.

[Carl H]

one octane point is not going to cause major damage...especially on a stock setup which runs rich as snot.

[20DET]

did u not think to stop wen the oil light came on???u wuda had to be on it for ages to run that many bearings