hoffmanb16

Right now I have a stock block b20b vtec and one day I will be doing a rebuild and adding a higher compression piston. I was going to use YCP slugs but I read that nippon makes a 84mm p30 and might consider using them.... Does anyone know where you can find them?

Im not going forged so don't suggest it.

Thanks for all responses.

93egSLEEPER

There are no p30's made over 81.5mm bore. Trust me I searched for weeks when building my GSR. Only PR3's, P73A0's and CTR's

N/A

Yea it may have been pr3s I seen, not too much differnce between the two a lil less cr, or u could get the ctrs and shave** down the dome a lil

hoffmanb16

84mm CTR's? .... really?

N/A

Lol nothing exceeds excess

hoffmanb16

what the fudge does that mean?

N/A

Nothing a joke, but I have seen them used with the dome machined down to bring down the cr and provide better clearance

hoffmanb16

84mm CTR pistons..... Ya I bet you see them everyday.

Face palm.

lol....

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no not everyday, my friend has them in his 2.0 I sat with him at his job while he machined the pistons and honed his block. I wish I could work in a machine shop and see that **** everyday.

No need for remarks, if you don't want to go thru the trouble just use the pr3s.

hoffmanb16

Sure u did.

N/A

Right so I didn't watch him fly cut his valve reliefs and clay his engine to the proper clearance on one piston, then match the rest to it and then shaved down the domes on each of them and then smoothed them out. I'm making it all up

Natural Aspirations

Hmmm.... Never seen the CTR's bigger than 82mm. Have any links to where these can be purchased?

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Found itrs but not ctrs, could've sworn they were from RS but I am only finding the ctrs up to 82mm like said...

http://cgi.ebay.com/ebaymotors/RS-MA...-/190495431320

I'm positive my friend didn't use the itrs tho the dome is too little. Ill look into it more even tho I've been called a liar twice so far

tempsohc

Cant find the nippon but these are basically either P30,Or JDM ITR. take your pick. They are available from 84-85mm.

http://cgi.ebay.com/ebaymotors/YCP-B...Q5fAccessories


http://cgi.ebay.com/ebaymotors/YCP-B...Q5fAccessories

93egSLEEPER

^^^Those arent P30's nor are they JDM ITR's. Those are PR3's and P73-A0's (USDM ITR)
The JDM ITR slugs will put the CR in the 13:1 range and P30's would be around 12.9:1. And thats with a B16 head. Those numbers will go up .3 of a point with a GSR head. The USDM ITR pistons are the best choice IMO. 12.3:1 w/ a B16 head.

Im not sure where they pulled their compression numbers from but they are wrong.

tempsohc

wrist pin location is 29.00 instead of 30.00 they are factory b20 wrist pin with a b16 or itr piston dome

Nonetheless if i am wrong about the wrist pin location i have used them on 92 pump gas and jun 3 cams with no problems with detonation.

93egSLEEPER

Hmm thats interesting. Thats something I would want to measure out myself rather than just assuming.
You had those in a B20V? I could see them working if they were JDM GSR slugs (P72-00) but the domes are too large for it to be those.

hoffmanb16

Ya those ycp pistons where the ones I was going to use, I see them on sale for 188 plus shipping on ebay sometimes.... Can't beat that really....

tempsohc

Yeah the pistons work fine in a B20 with a gsr head. .016 off the head and .004 off the block. Calculated comp somewhere shy of 12.6:1

N/A

Ycp is made in china no?

hoffmanb16

yes they are.

jesster1

Nippon Racing just came out with the 84/84.5 and 85mm P30s

93egSLEEPER

1. prove it. only stock piston offered in 84+mm are stock B20's and ITR reps. Unless they cam out this morning I have not seen them.
2. Nice 4 year thread bump

jesster1

Will upload images later this week. They arrived on Friday. I know its been 4 years but I think there will still be plenty of demand. They made them in 81 to 82mm and 84 to 85mm with Teflon Coated skirts and Ceramic decks

jesster1

It wont let me upload images but pm me and I will send u the image from my phone.