Your right, OS valves wont do a thing w/o head work. If they were slapped into a stock head w/ cams at the bare minimum the lash issue would be solved for a lot less than OEM toyota shim prices or custom. Then when the ports get cnc'd, those larger valves come into play. At 1000bhp i would assume the heads are getting work done besides just the cams?
Hey gents, I have a question concerning head work on a boosted 1UZ. I know you all mentioned not seeing much of a gain running over sized valves, and that money is better spent on porting etc.
I remember being told, back in my Supra days, that the 2JZ responds well to cleaning up the last 1/2" or so of the ports just before the valve. Namely opening this area on the exhaust port to 85% of the valve diameter, and 90% of the valve diameter on the intake port. The science behind it sounded pretty logical and those numbers have always stuck in my head. Do you all think this would be advantageous on the 1UZ heads running longer duration/higher lift cams?
^^^nothing wrong with standard valves, we still run them. heads aren't even ported much, just a tickle up/mild port. it's not always bigger is better, its getting them efficient and picking the right cam.
As with most 4 valve engines.. Hardly rocket science...as ash said, takes bugger all, depends on how fast u drink ur beers even a little bit makes a big improvement.
Wanting to replicate this 1000 go build. Just wondering how you port match? If it could be explained? And can anyone post successful cam profiles?
this thread has been more than helpful, you guys are so informative! I am putting the 1uz into a 1970's corolla, building the motor then swapping it in. what transmission do you guys run with this kind of horsepower?
so for boost i'd need the following:
argo rods
ross pistons
balance the crank
port the head
get cams, dependant on flow of head
l19 head stud set
arp hardware for pistons
anything need to be done about the oil system?
also are there any single turbo applications that can make this horsepower?
i'm talking for the 1000hp mark. no l19 headstuds? man i needed those in my dinky 400whp mr2 turbo (stock bottom end).
no grout needed....and a two speed powerglide...any internal work to the 2 speed? building my first big performance drag car! i am stoked!
What type of trim turbo do you guys recommend for this turbo app, i'm trying to keep cylinder pressure low, so a big laggy mother would be great!
well it would be aa 1971-1979 corolla, gutted, and stripped with only necessary reinforcement, cage, shute, the safety gear. streeted, and strip
also adding questions:
what are you guys doing for fuel at this hp level (pump, fuel rail, injector size, fuel -an line size, regulator 1:1 rising but what size output?) and also what are we doing with the ignition?