downpipe

well, piston #4 took a crap so its time to build the motor. what are your opioions on what size overbore to use?

BodyKits NW

Go 84.5 or even 85mm.

BowSeR

will a 84mm in a GSR equal a 2.0 or must you go to 84.5mm

boosted3g

you will probably have to go to at least 85mm to get a full 2000cc's. I measured my LS and with an 85mm bore (3.346 inches) and the stock 89mm stroke I get 2002cc's. I know the GSR has a shorter stroke than the LS. Either way its close enough you can call it a 2.0

Bert

84.5mm in a GSR block is 1956cc, I believe. The problem with going to 85mm is I haven;t seen any off the shelf pistons available in that size, so you'd probably have to go custom which would be considerably more expensive.

Project_Integra

I dunno if this would work, but Endyn has the rollerwave pistons for the b20b/z up to 86mm. With the proper rods you should be able to use those pistons in an integra block. It may require some modifications of the rods, but the cost on the pistons are not all that bad. $485 for the pistons and $78 for the ring set.

Bert

Are the 85 and 86mm Endyme pistons actually available? On their product list the piston and pin weights as "TBA" which lead me to believe they weren't really out yet. OTOH, maybe they just haven't updated the site. I was under the impression that the CRV pistons would work with the GSR rods without modification, but maybe that was incorrect. I usually see all the b-series rods listed as the same part (http://store.importparts.com/cgi-bin...iew/CRS5394A3D)

ekb18c

endyn has 84.5 mm pistons on the shelf. So does Arias and Je.

Project_Integra

As I was told, to put B18C pistons on my LS rods would require modifications to the rods, so I assume the same would be true to fit B20 pistons on your GSR rods. It could be done with the help of a competent machine shop. If you have the money to spend, you could probably get a B17a crank and call it a day. Then you wouldn't have to worry about the machine shop. I saw 1 or 2 on partstrader a couple of weeks ago. Good luck finding one though.

boosted3g

JE also has 85mm (3.346) pistons in stock. You can get 9.0 10.5 or 12.5 compression ratios. Just get it sleeved for 84.5mm and then when you bore these will drop right in.

Bert

Nice... some 85mm 9:1's sound good to me! According to my calcs that would be 1979.3 cc's. Now if I could only get my hands on a cheap B18c block and crank. So does anyone know for sure if machining of the rods is required or if you just need a machine shop to attach the pistons to the rods?

VaporTrail

That is incorrect. All B series rods are NOT the same, same with the cranks. However, some are interchangable:

B18c1 and B18c5 = interchangable
B20b/z and B18a/b = interchangable
B16a has it's own rods

boosted3g

forgot to mention that those figures are with a 42.7cc head. Be sure to open your head up to 85mm then get your volume of the chamber before you order the pistons.

Bert

Interesting. So what would have to be done to use the JE or Endyne pistons with a B18C crank in a sleeved B18C block?

Liltrix

I have a 20 over 10:1 Je with boost feels great! but something to consider when going so aggressive is the head. If U are going that aggressive like 85~85mm, U need to match the dome of the head to the new piston size to maintain some sort of consistency (The squish area and the Piston)

dohc_Cx

i think eagle rods would do the trick..when you're sleeving a block and boring it, you're not changing the r/s ratio, so then you wouldn't need to do anything to the rods except get stronger ones..am i right?

Project_Integra

Nothing, as far as your rods go. You would have to bore and hone your sleeves, but no modifications need to be done to the rods. That's why most piston manufacturers have specific pistons for each rod assembly. ( I guess).

That is usually the reason why they specify an engine code.

Bert

I would definitely be opening up the combustion chamber to whatever bore I go with. What I'm asking/wondering is if the JE or Endyne 84.5mm pistons would fit on the gsr rods, and it not, would the Eagle LS rods with the 84.5mm pistons work with the GSR crank? IOW, if I had a GSR block and crank, what parts would be needed?

Edit: Project, so the even if the 84.5mm psitons are intended for a B20 they will work? Or are the JE 84.5mm pistons designed for the GSR?


[Modified by Bert, 12:45 PM 12/12/2001]

Project_Integra

Here's a thread that may be of interest https://honda-tech.com/zerothread?id=88097
Even if the B20 pistons were designed for a B20/B18a/b rods, you could modify your GSR rods to get em to fit. Somebody on here has probably done it. To get the bottom line, you may have to call JE/SRP.

If you check out that thread, I was asking if i could put GSR pistons and rods on my LS crank and the answer was no....Basically because a little bit of "rod stretch" can occur, which causes A LOT of problems. I would assume the reverse would be true, so putting LS rods on your GSR crank would also cause problems.

BowSeR

what would happen if you didnt open up the combustion chamber to 84.5

VaporTrail

What would have to be done? Bored, honed, balanced, assembled. I've not yet run into assembly problems with aftermarket pistons - only OEM pistons.

turbotypeR@SPEC

leave it stock bore and turn up the boost.you can make more power than the car can ever put to the ground with stock bore.plus you can just throw on a stock head gasket.you will not have to worry about custom gaskets that aren't as good as factory.

downpipe

yes thats what my shop told me. they said headwork would be a better investment...since everything is going to be apart anyway. as far as the sleeves go, they have some treatment i don't know what it is called. but they pour some sort of compound into the block - it bonds with the metal and then they drill holes in it for coolant flow...supposed to dissipate heat well and they have a guy running 500hp no problem. plus its unly 200 bucks. can't beat that. we'll see...

BowSeR

from what i hear you dont need to find another head gasket you just get your stock one cut out

Suprdave

Actually, it crushed with the bore, but anyways...

Just bore to 84.5mm and run a Cometic Gasket.

It's close to 2.0L. Displacement is always rounded up anyways.

Off the Top of my head, I think the GSR is 1793cc and the LS is 1834cc.??

They are both called 1.8L

The B20 doesnt have a 2.0L Bore, its like 19xx something...

Suprdave - 'No Replacement for Displacement"