I'm currently running stock crank at 1000hp, crank flex happens, and you just run a bearing clearance for it.

500 your fine.

 

Ap1chief tuned my stock longblock as well and we had it up to 29 psi on a 6466. The motor took a very good beating..was boosted for 3 years. It dropped a valve and thats why the block got ruined. I wish I upgraded the valvetrain.

 

she was flying too

 

I'm pretty sure Carey Bales ran the stock crank at 1500 hp for as long as he ran his F series blocks built by IP.

 

Agree up to 500 you are generally fine, but i respectfully disagree with your latter assessment.

Honda cranks are capable of handling up to 1000+hp. However, finding a crank that is straight, runouts within less than four-tenths of a thousandth and all journals are taper-free and within two-tenths of a thousandth of each other and balances to .5g is rare. It comes down to what you want to use the car for, most reputable builders don't compensate with bearing gap to migitage for flex on out of spec crank, at least if you want the motor to last. You get an aftermarket crank which is straight and true, or machine the honda one to straighten it and regrind the journals. I guess that is the difference between someone who blueprints a motor with a purpose.

In any event, thanks for everyone who provided feedback. I'm still on the fence on building an s2k from ground up, would prefer to buy one already built and save time and refine it.

 

Let me get this straight... You want to build a 700+ HP S2000 to daily drive up to 48k miles a year?

Makes no sense but I support it. Great data points for the community and seems like you've been down similar roads before. If you plan to use the HP at all, it doesn't sound like transmissions last at those HP levels and there are no readily available kits as far as I know. There were some 350z trans kits available but I haven't seen many documented. The SuperK folks are working on an 8 speed BMW DCT that should hold the power but isn't done yet. That will probably require some mods to the trans tunnel. Diff is an issue too but a much more solvable one than the trans. Best of luck!

 

Got well over 200k miles on the 500hp motor. 95% of my driving is off boost driving on the highway. How you drive your car and built it will show.

One option is T56 conversation, which I've seen on a few s2k.

 

I ran 20psi (sc34 "5656") for 4years/100k miles on a b18 (stock with headstuds).

I would say 350-375whp is somewhat reliable on a b-series.

 

Obviously driving habits make a huge difference, in general stock b sleeves don't handle constant abuse. Sure some will last longer than others, timing and cylinder pressure make a difference. I certainly would not recommend it to anyone planning on running more than 7psi on the regular especially if your goal is over 300hp. You can also install a ebay turbo kit too from china, but that doesn't mean you should.

 

If I was to decide to sell my 16k mile, one owner, garage kept and never in the rain or snow S2k, and that has the best of the best build parts (such as a $8k IP blue print fully built engine, a $7k RPM/Gforce billet T56, a $5500 Super 8.8 diff kit with 4.09 gears and a DSS carbon fiber DS and 1000 whp axles, Full Race forward facing manifold and 6466 BB turbo, Schmuck 1000 hp intercooler, Infinity EMS, CJC billet twin 450 in tank pump setup with -10 and -8 lines, ID 2200cc injectors, etc, etc, etc, all brand new items) ..... What kind of money are you willing to spend for said s2k? That would even make me consider possibly selling it.