Quote:
Originally Posted by Element Tuning
What I'm looking at doesn't look ideal for high power at all compared to the EJ20 crank which is very good.
As noted the newer material with nitride coating has proven inferior regardless of what the keyboard experts say. Is it a deal breaker? No.
The narrow bearing journals could be a deal breaker for really high power. In general the rod bearings on the EJ20x and EJ25x need very high and consistent oil pressure to survive because the narrower the bearing surface the greater the psi. Lets face it the FA20 is about efficiency, not handling high power. You can forget about that 0w-20 oil with high power since these bearings will be even smaller.
Now much of the engines geometry is better and should put less stress on the bearings but still I'm going to be monitoring oil pressure very closely as we build up this engine's power.
|
Well said, and it's good to see someone shares my point of view on the narrow bearing journals. Maybe they use crank bearings that feed oil through the crank through several degrees to help maintain oil pressure as long as possible.
I guess we can hope for the best right? Most older cranks were shot-peened instead of nitriding. I'm sure nitriding is more cost-effective and is likely just as good. But I've never tested the strength differences. One changes the metallurgy and the other changes the grain structure.
Good call on the oil pressure too. I'm hoping they supply a stout oil pump in this engine as well to handle high rpm and maintain high oil pressure with the light oils being used. I'm still thinking 0w40, 5w40 etc is going to be better for a turbo build.
You find anything out about internals, let me know. I'm very interested.