Did search, found nothing. Can this be done? I have been offered a built b20 block with stock internals, fully balanced and f20c pistons. 12.6 cr. And if it can be done will it last? I am not gonna boost.

 

Interesting.....I will have to check on that!

 

Thanks. Bump!

 

bump, cuz I wanna know too.

 

2005 Honda S2000 Specifications
Type 16-Valve DOHC VTEC Inline-4 (F22C1)
Bore & Stroke (mm/in.) 87.0 x 90.7/3.43 x 3.57
Compression Ratio 11.1:1

1999 S2000(F20C)
Engine Type
DOHC VTEC in-line 4-cylinder aluminum alloy cylinder head, FRM (Fiber Reinforced Metal) cylinder liners, Lightweight forged-aluminum pistons and heat-treated (carburized), forged-steel connecting rods, high-efficiency oil cooler
Broke & Stroke 87x84(mm)
Compression ratio 11:1





The only way I see these pistons fitting into a B20 is if the B20 is sleeved to 87mm instead of the stock 84mm.

Now F20C Pistons in an H22 or H23, now maybe that would work.

 

You go to it before me hybrid, the s2k is a really weird bore and stroke, i guess if you were crazy enough to sleeve a b20 to 87mm, then you might be able to use those pistons.

 

If I remember darton offers an all motor sleeve in 87mm.They offset the bore spacing slightly and don't cut the bottoms for o-rings.A little extreme for me.
Glenn

 

87mm sounds extreme to me in a B20, but H22 and H23's come stock 87mm bore, so this may be an option for our H-series guys.

 

What about s2k pistons in a k24. Has anyone tryed that? There both 87mm if im not mistaken.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rusty Shackleferd &raquo;</TD></TR><TR><TD CLASS="quote">What about s2k pistons in a k24. Has anyone tryed that? There both 87mm if im not mistaken.</TD></TR></TABLE>

Probably possible. Especially considering that the F20 in the S2K is basically a K-series motor.

 

i thought they were 87mm?

yeah the whole post didnt load for me sorry, but anyway an s200 crank rods and pistons would be dope in a k24 (maybe not the rods dunno if they are long enough) with a k20R head

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JCushing &raquo;</TD></TR><TR><TD CLASS="quote">i thought they were 87mm?

yeah the whole post didnt load for me sorry, but anyway an s200 crank rods and pistons would be dope in a k24 (maybe not the rods dunno if they are long enough) with a k20R head</TD></TR></TABLE>

No I would keep the long stroke for torque in the K24. The Pistons maybe an idea but K-series pistons have an unusual design.

 

i might try the s2k pistons in a b20 during the summer if i find some 87mm sleeves for a good price.....i'll let you know if i do

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbofienD 04 &raquo;</TD></TR><TR><TD CLASS="quote">i might try the s2k pistons in a b20 during the summer if i find some 87mm sleeves for a good price.....i'll let you know if i do</TD></TR></TABLE>

If you can find 87mm sleeves, I would stroke the motor to either 92 or 95mm too.

 

i heard nsx-t piston will work with b20 also with stock sleeve

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NA916DragSter &raquo;</TD></TR><TR><TD CLASS="quote">i heard nsx-t piston will work with b20 also with stock sleeve</TD></TR></TABLE>

I just checked on that. NSX Pistons are......

Manual transmission:

Bore: 93mm
Stroke: 78mm
CR: 10.2:1

Automatic Transmission:

Bore: 90mm
Stroke: 78mm
CR: 10.2:1


I check on NSX's from 1995 to the new 2005. Haven't found anything on the 1991 NSX.

 

OK so the B20 should be bored to 87mm. What about the stroke? Whats the stock figure for B20?

AFAIK this built B20 is stock internals, only balanced. I really don't know whether to believe this engine is relly what he says it is. If so it should last right?

 

Just emailed the guy and heres his reply -

"Hi mate
Yes the spec is true...
This block has a well balanced crank assembly, it revs smoothly to 9000
rpm.
Block guard
F20B, 85mm pistons with, modified valve pockets to suit Jun 3; Static
compression ratio 12.5:1
Does not throw white smoke & lose engine oil like a forged piston
Stock rods, (balanced assy)
CrankB20B, blueprinted bearings (balanced assy)"

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Redsun &raquo;</TD></TR><TR><TD CLASS="quote">OK so the B20 should be bored to 87mm. What about the stroke? Whats the stock figure for B20?

AFAIK this built B20 is stock internals, only balanced. I really don't know whether to believe this engine is relly what he says it is. If so it should last right?</TD></TR></TABLE>

Stock B20

Bore: 84mm
Stroke: 89mm

If it is stock then it is already balanced from the factory!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Redsun &raquo;</TD></TR><TR><TD CLASS="quote">Just emailed the guy and heres his reply -

"Hi mate
Yes the spec is true...
This block has a well balanced crank assembly, it revs smoothly to 9000
rpm.
Block guard
F20B, 85mm pistons with, modified valve pockets to suit Jun 3; Static
compression ratio 12.5:1
Does not throw white smoke & lose engine oil like a forged piston
Stock rods, (balanced assy)
CrankB20B, blueprinted bearings (balanced assy)"</TD></TR></TABLE>

so 85mm on stock sleeves???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Redsun &raquo;</TD></TR><TR><TD CLASS="quote">Just emailed the guy and heres his reply -

"Hi mate
Yes the spec is true...
This block has a well balanced crank assembly, it revs smoothly to 9000
rpm.
Block guard
F20B, 85mm pistons with, modified valve pockets to suit Jun 3; Static
compression ratio 12.5:1
Does not throw white smoke & lose engine oil like a forged piston
Stock rods, (balanced assy)
CrankB20B, blueprinted bearings (balanced assy)"</TD></TR></TABLE>

Let me search into this and I will get back to you tonight when I get off work. Where is this guy located? Sounds like Australia!

 

OK, my mistake. It's not S2k F20C pistons but F20B. Thats accord SOHC right?

Thanks for your help Hybrid_Vtec.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Redsun &raquo;</TD></TR><TR><TD CLASS="quote">OK, my mistake. It's not S2k F20C pistons but F20B. Thats accord SOHC right?

Thanks for your help Hybrid_Vtec. </TD></TR></TABLE>

F20 to me sounds like DOHC F20 out of the accord. I believe the SOHC accord motors were the F22 and F23. But I will look it up later.

See if you can get pics of the motor!


Modified by hybrid_vtec at 10:45 AM 2/7/2005

 

Sent you email.

 

if the f20 pistons fit im considering putting them in my b20 block