j0keefe21

currently building a head up for my y8. i know they have oil issues and was wondering how high would i be able to rev the bottom end safely?... b7 oil pump btw

Ya Digg

I have no idea what will really happen with a sohc bottom end but I know they have small rod bolts. in fact they are the same as the ls ones which people upgrade when they make it a higher revving ls-vtec. so I wouldnt try to go much further than redline without rod bolts. as far as oil flow i have no idea.

Dkober101

y8's are highly know for spun rod bearings. If your going to be doing any work do yourself and take the time replace them. i myself have lost a completly stock y8 to a spun bearing.

GL

Newsom91

um i got a question...how u check your oil? i know the oil dipstick sticks in the y8 but im pretty sure the b7 has no spot for it. lol but yeah ive heard y8 pumps are sucky do to the flow rate or whatever. but ive seen alot of write ups bout porting and shimming the oil pump just for better protection

j0keefe21

haha i feel like a dumb ***. i bought the pump with the short block but everything was in pieces so when i was putting it together i noticed i had a b7 oil pump and that i had no oil hole... i knew the general location of the y8 dipstick but didnt know it was in the actual pump. (im used to the z6) so i guess i'll be picking up a new oil pump and porting and shimming it? i mean all the bearings are going to be new in this motor and the crank just came out of the shop so hopefully i would like to rev to 8k safely

DCRB

dang i would have picked up an a6, z6, or zc crank shaft while you were at it. twice the oiling ports vs. the y7/y8

thumper64

Just get a Z6, A6 or ZC motor. The only good parts of a Y8 is the head.

boost and bass

yea a z6 block and a y8 head with y8 tranyy would be best, and btw not sure what your project/goals are but d-series are very unresponsive no N/A mods for example a fully built d16 head and block high compression ITB updgraded Fuel header exaust etc. would make around 180 WHP with a biult head and a z6 block, with arp's top and bottom, a good clutch and flywheel turbo'd you would have yourself a little monster

j0keefe21

12. to 1 with a 59500 cam, nitrous.... thats pretty much what the motor is going to be

Got traction

i rev my y8 to 9200

j0keefe21

so what mods do you have that help you not spin a rod bearing at that high of rpm? and how long have you been doing that for?

Got traction

6,xxx miles on the motor, it makes 430whp nd 305ft lbs torque. i did nothing to the oil pump besides replace it when i built the motor. i get 20psi of oil pressure at hot idle, and 95psi at cold start.

92lxsleeper

why do people always want to run their engines to the maximum rpms? there isn't any power there, even if u upgrade the valvetrain and cam, you prolly wont benefit 8K + rpms.

im gonna build a turbo B20, but im gonna have it geared, and tuned to make all of its power before 6k rpms. i want a similar torque and hp curve compared to an american low reving engine.

boostB4beauty

7800 is about the highest you wanna go, built or not.
Anything higher than that is pushing it, and unnecessary. IMO
Why try to squeeze those few extra HP if it means risking a catastrophic failure? You really don't gain much more after 8000.

Got traction

i made power all the way to 9k. then we raised it 200 more rpm to keep it in boost between gears.

lots of people make power past 8k, i had a friend that made power to 11 on a itr

j0keefe21

well i dont plan on shifting past where im makeing power i just am expecting with that cam to be making power that high.

07Lxcoupe

Yea I guess cbr's and gsxr's and other bikes and F1 motors spin in excess of 10k rpms because they dont make power past 8k, huh? Maybe they do it just to say their motors rev that high? IDK?

j0keefe21

your talking about a whole different animal

D Griff

I have a D series with a few bolt ons, I'm no expert, but revving high is fun/addictive.. I hit 8200 regularly

just kidding, 2800's a pretty good shift point

D Griff

it's maxing out at 100 whp regardless

92lxsleeper

at around town driving i shift prolly around 1800-2000. under full throttle i keep it at 6k rpms, and my d15b7 still beats my friends accord H22

Blue_eg95

Upgrading teh head just isn't enough. The oil pump may be bigger but the oil galleys in he block, crank etc will be the same size. Also have you had the crank balanced to a higher limit? What is teh y8 harmonic balancer rated up to?

I don't know I want to run a high revving motor too but either no one has done all this research because they felt it wouldn't give them much gains or they didn't publish it.

My advice, rev higher, just not crazy high. Stay with 8k or so i'd say.
You'll have people say I can rev up to 10k. And i'm sure you could to. But for how long? if your car breaks down can you afford to fix it? Can you have the car just sit for a few days?

All things to consider
I'll shut up now

j0keefe21

no good point. i'll shift around 8k im sure i'll be fine and if i spin a rod bearing i always got that trusty b7 in my garage that i could put back into to action in an afternoon.