s2kreeper

Hey, I've been kicking around the idea of what happens when the engine starts wearing out and I pull it for a build (won't be any time soon.. only 50k) and I was wondering if anyone had experience with a setup that reliably gets to 10k? I'd love to start getting a list for parts going.

JUSTINTHECOASTIE

10k on an F20c stock can be done. 10k out of a F22c wouldn't make it due to height of shortblock and then of stroke, piston speeds, piston side load at that rpm....tons of other variables I'm too tipsy to ramble on about

s2kreeper

So you can't even get it with proper retainers, valve springs, and a lighter piston/rod combo? Darn

JUSTINTHECOASTIE

In an F22c I forget what rpm you get piston valve contact but i know contact is before 10k. The issue is bigger than lighter rod and upgraded valve train

s2000Junky

If you have a heavy enough valve spring to keep the valves from floating, there wont be any valve to piston contact. If the F20 can do it so can the F22. Revisions for good connecting rods will be more crucial in the f22 due to the higher crank stroke and shorter rod length = more rod angle= more rod stresses. The head is the easy part. Personally if I wanted to make a high rpm screamer and have it last a little longer, id go with an f20 build. One thing to consider, for upping the displacement without jeopardizing rpm limitations, is run a bigger piston, going over square. Keep the crank stroke short.

JUSTINTHECOASTIE

I agree. Much easier to do with a F20c. Op maybe you could be the first to build a F18c revving to 14k LOL

Kermdaddy

The issue is not if you can do it, but the cams won't make power that high. You would have to have a custom set of cams to take advantage. I personally can't justify the cost, but can see the value if you do it right.

liquid_helix136

My ap1 has a flat torque curve from 7k all the way to redline (set at 9300) I upped it from 9k because I noticed torque wasn't dropping off for whatever reason. It slightly begins to fall off at about 9200, but I bet if I had the means, it would be worth while to take it to 10k. I know this definitely isn't the case for a lot of engines, especially F22s, as torque tends to start dropping off around 7k on those motors. But I've seen plenty f20 dynos that are still going strong at 9k.

If you did run into the problem of torque dropping off up top, it seems the BC stage2 cams help up top a good bit, so that may be enough to keep torque up at high rpms