Another 7AGE project

[peter møller]

NoHachi Wrote:What I don't get is the 8000rpm part...that is astronomically high for this engine geometry..Are you doing anything to reduce the stresses to the crank and rods? Lighter rods and pistons?

The high pressure oil pump is a good addition..The whacky rod to stroke ratio will introduce a lot of extra lateral stress on the cylinder and cylinderwalls. That means a lot of extra generated heat that needs to be carried away. I would be very cautious about running very rich mixtures for any sustained time periods to try and minimize bore wash. Having the cyl.walls coated would be even better.

The ARP bolts would be a bit overkill I think..you wont be running very high cylinder pressures. Fresh OEM ones would be fine.

As it turns out....'ARP bolts are a "no-no" for the 7AFE bottom end, they have to fabricated on the factory on order, so I have put that aside.

Regarding the RPM´s i have to say that in all honesty, i never expect the engine to go much above 7500rpm, but i have decided to keep the rev limit at 8000, but i may change that to 7500.
I have been told to be careful with RPM´s on the 7AFE bottom, but i have seen several previous builders easily doing 7500 and above without any disasters done, and thats on a quick, swap, where i have spend time balancing everything. But still.....weight hasn´t been reduced, only balanced.