quote:
Originally posted by JohnBrowning:
They did not design this engine to be run at 8200 RPM's while you do 5-20 laps around the track!
I hate to admit that I watch any fwd shows, but a show that has a pair of twins as the spokesman are building a 6 cylinder toyota motor that they hope to get over 500hp at the rear wheels.
To do this they replaced the stock rods and rod bearings with h-beam rods by carillo and the rod bearing width was taken from .7xx to .955. The crank was also made of high dollar forged steel. The said the stock toyota setup was only good for about 300hp.
Lots of modifications necessary to make the motor live with lots of boost and maybe nox.
They used neo synthetic oil as an assembly lube.
Maybe its a comibnation of things that went wrong. Bumping the rev limiter, uncovering the oil pickup in an engine not originally desinged to be road raced. And I think that the only way the oil pickup would not be uncovered in this instance would be extensive oil pan modification to keep the oil around the pickup. Doesnt sound like that happened. When you push the design of the engine that hard its not a matter of will something happen, its a matter of when.
I dont have any experience building 4 cylinders, but I built a mopar 340 some years ago that I still have fun with. My intent was to have fun with it on the street and it to live forever. One modification I did do was to braze dams to the oil pan to keep the oil from running away from the pickup. Another was to keep my rpms under 6000. Cam, heads, gearing was all optimized to work together in this rpm range. In over 10 years of use it broke one rocker arm. Over 1200 1/4 mile runs.
The engine had a sump that was toward the middle of the engine. I brazed in sheet metal so the oil couldnt crawl out of the pan. Had a windage tray installed also. I run 6 qts of oil and never have had a problem braking or accelerating uncovering the oil pickup. On mopar small blocks this especially happned during braking. usually #2 main was the first to go from this happening.
Dan
[ August 29, 2003, 07:40 PM: Message edited by: Dan4510 ]