High compression pistons for f22b2?????

thething96 · Post by **thething96** » Fri Jun 10, 2011 12:41 pm

Hello. I posted this originally on pgmfi.org, just trying to see if the experts here have and good feedback.... Hi, as the title states, I've been looking everywhere(bisimoto.com as well), trying to find high compression pistons for my 1995 Accord f22b2 block. I'm trying to get the pistons to be standard bore, around 11.5-12.1 compression. Most I found were 1mm over, or more. Just wondering if anyone has any tips about the subject. Another question is I was wondering if any one had an idea if there are any companies out there that make cast pistons, like \"nippon racing\", for the f22b2 as well. I've looked all over google, and nothing. This is my first f22b2 build. I've done plenty of b series projects, but this one is a little harder. Thanks.

thething96 · Post by **thething96** » Mon Jun 13, 2011 5:27 pm

Anyone? Any help would be appreciated.

thething96 · Post by **thething96** » Tue Jun 14, 2011 3:20 pm

Ok, I found this. If anyone has any experience with piston dimensions, please input here.... Thanks. F20B = open deck F22A = open deck DECK HEIGHT F20B = 219.5mm/8.643 F22A = 219.5mm/8.643 D BORE F20B block = 85mm/3.346 F22A block = 85mm/3.346 ROD LENGTH F20B = 145.0mm/5.709 F22A = 141.5mm/5.572 ROD WIDTH F20B = 23.75mm/.935 F22A = 23.75mm/.935 ROD MAIN BORE F20B = 48.00mm/1.890 F22A = 51.00mm/2.008 PIN BORE F20B = 21.97-21.98mm/.8649-.8654 F22A = 21.97-21.98mm/.8649-.8654 COMPRESSION HEIGHT F20B = 31.0mm/1.221 F22A = 30.5mm/1.203 PISTON VOLUME F20B = +8.0 cc F22A = -14.5 cc WRIST PIN DIAMETER F20B = 22.0mm/.866 F22A = 22.0mm/.866 STROKE F20B = 88mm/3.464 F22A = 95mm/3.740 -personally this is where i think this idea goes out the window MAIN JOURNAL DIAMETER F20B = 55mm F22A = 50mm ROD JOURNAL DIAMETER F20B = 44.98mm/1.771 F22A = 47.95mm/1.888

thething96 · Post by **thething96** » Tue Jun 14, 2011 4:10 pm

by the way, these are comparissons between an f20b and a f22a. f22a's are the same thing as f22b2's. thanks.

thething96 · Post by **thething96** » Tue Jun 14, 2011 6:17 pm

The reason I posted this is because I was complentating of going with f20b pistons on the f22b2 block. Thanks for looking.

thething96 · Post by **thething96** » Wed Jun 15, 2011 2:10 pm

I found this compression calculator: http://www.zealautowerks.com/index.html and found engine spec as well: http://www.accordinglydone.com/forum/sh ... hp?t=15402 Using both the f22b2 and f20b specs, according to the calculator, compression will be 13.1.1, with a piston-to-deck height of -0.500 mm. What do you guys think? If anyone else wants to try, I would love a second opinion.

Julio@bisimoto · Post by **Julio@bisimoto** » Wed Jun 15, 2011 5:53 pm

If you are interested in custom pistons for your application Bisimoto can manufacture them to your specific bore and compression. You must go oversized at least .5mm running factory bore on worn cylinder will cause problems with ring seal and oil consumption. It is much better to bore and hone to the next size up to get an even cylinder bore for a nice seal. Give me a call at 888-922-6686 for more information (Julio in the tech department)

thething96 · Post by **thething96** » Fri Jun 17, 2011 1:34 pm

Thanks Julio. I'll keep it in mind, for sure.

thething96 · Post by **thething96** » Tue Jun 21, 2011 2:36 pm

I called bisimoto's tech dept(thanks Julio for the help). They are real good people, and have great customer service skills. I was trying to get some 12.1 pistons on a stock bore(85mm), being that I'm in the process of scooping up a freshly re-sleeved f22b2 block, for the f22b2, but all they offer is 86mm or higher. I was told that custom pistons with an 85mm bore go for around $650.00, which is not bad, it's just too much for this project. I'm just trying to get a litte more power out of the setup. Thinking about going h22a or the whole f20b, but having a single cam with descent power is my plan. I talked to a machine shop operator, and told him about the piston to deck clearance, which is -0.500 mm. He said that would work just fine, and it shouldn't have any piston to valve clearance issues. But if I go with the f20b pistons, the compression is around 13.1.1, which is too high for a daily driver, I think, or as long as i go full e85. What do you guys think?

JaredKaragen · Post by **JaredKaragen** » Tue Jun 21, 2011 3:22 pm

13+:1 is ok if you have access to: e85 leaded fuel race fuel (108+) you can use 92, but your risking a lot and moving timing to a low efficiency zone by doing that...

thething96 · Post by **thething96** » Tue Jun 21, 2011 5:26 pm

I'm from Illinois, e85 is plenty available. Also, 93 octane is the highest octane rating fuel gas stations have, most of them. There ase some local stations that carry 100 octane. Thanks guys. I think no one else has tried this, so I'm in virgin territory here.

thething96 · Post by **thething96** » Fri Jun 24, 2011 12:19 pm

Looks like this is a going to be a hard project to do. I'm thinking of going with f20b pistons with the f22b2, which is going to give me a compression of 13.1.1. The other option is to go with f20a doch nonvtec pistons with either h22 or h23 rods, which will yield 12.3.1 compression. The hard part is to locate all these parts. If anyone has good connections with parts importers or engine suppliers, please chime in and help a fellow eCtuner out. It's going to take some time to finish up, but I'll try my best to make it happen, and if it happens, I'll take the project step by step, and hopefully help others with similar projects. Thanks.