Does anyone know the specs of the bisi f20b forged slugs. I tried emailing them, but haven't heard anything back from them. I'm trying to get the compression height and dome c.c. I'm using an f23 crank and rods in my f20b block, in so doing a 11:1 cr piston comes out to 12.8:1 or around there. I'm dropping a turbo on it, so that's a little high. I *think* the 9.5cr bisi pistons are -5c.c. and the 8.4:1 are -14 that is assuming the stock compression height, but I want to be sure before I order. I've tried searching but haven't gotten anywhere.
Thanks in advance.

 

The F23 uses a 30mm compression height piston from the factory. F20B uses a 31mm. Using the F20B pistons on F23 rods/crank will raise the advertised compression significantly. That's why they're substituted for K20/24 pistons.

 

Yes I know. That's why I can't use the bisi 11:1 f20b pistons. But I can use the lower compression ones... If I knew the specs I could figure out which one. The bisimoto forged f20b pistons are $499 a set with heavy duty pins. Availible in 11:1 , 9.5, and 8.4:1, but no actual specs are listed. That's less expensive than most k20 forged slugs that I've seen.

 

Wiseco K20s are $499 shipped. You get more for your money with them as well with the skirt coating, etc. They make a very nice piston and I believe they're more street friendly than the Arias ones bisi sells. I had a set of Arias pistons and I hated them. Made way too much noise at the recommended P2W clearance. Had to let the car warm up for awhile before I could leave the yard without it sounding like it was rattling itself to death.

 

Where have you been the past 2 years? Bisi doesn't do Honda anymore, not as far as producing parts goes. He pretty much only produces parts for Porsche now, and mainly focuses on tuning exotics

 

I actually found some k20 pistons for the same price. Then bisimoto replied:
The compression height for the Bisimoto spec F20B is 30.7mm, and the domes are -13, -3, and 5cc respectively. The arias brand is superb, and what we use in all of our street and race builds with the utmost in reliability, longevity and are quiet when the proper piston to wall clearances are adhered to.