B20vtec

[mADmAN]

custom machine shop is about 1.2k iirc .... but S90 i guess slightly more.. prolly in the 2k region...not too sure

 

[YEN96]

supertech pistons RM1.4k (depending where u buy)

BC Racing conrods is RM1.2k (not sure H or I Beam)

total 2.6k....thats how much i got mine iirc.

How is Supertech piston compare with CP and Wiseco ?

 

[mADmAN]

good....

my mech uses wiseco extensively...but he also uses supertech alot.... and he says "tahab gila"

 

[YEN96]

good....

my mech uses wiseco extensively...but he also uses supertech alot.... and he says "tahab gila"

wat is the difference ?? cp supertech wiseco ?? heard got mahle also haha

 

[mADmAN]

one of my older posts...

theres basically 3 types of pistons generally used for engines..

1/ cast iron
cast iron are basically stock pistons...the good thing about them is that they dont expand much when heated up and they take very little time to heat up. this allows for tighter piston to wall clearance which basically eliminates piston to wall slap. they are also the weakest type of the 3.

2/ forged with low silicone content using 2618 aluminium
Example of the brand is Wiseco. this type is the strongest of all....the downside is that both types of forged pistons will expand MORE than cast iron pistons so will require greater piston to wall clearance. another downside is that they take longer to heatup and expand. so during cold starts, piston to wall slap is pretty common...at least til the pistons warm up. wall slaps can scratch ur sleeve.

3/ forged with high silicone content using 4032 aluminum
Supertec and CP uses these... a common trait of forged pistons is that they expand MORE than cast iron pistons so will require MORE piston to wall clearance. the bad thing is, they take longer to heat up and expand.. so during cold starts, piston to wall slap is common. again, wall slaps can scratch ur sleeve. this type of piston however, expands less than the one above. so u can get tighter piston to wall clearance and minimize wall slap. they are also not as strong as the one above but still significantly stronger than cast iron pistons.



myself, i went with supertec 11.5 pistons for my rebuild. my mechanic wanted me to use wiseco, i refused as i didnt wanna take the chance of slapping.. though i know hes built a number of daily driven engines with wiseco with no issues...no slapping etc. but still i kiasu...so i dun wan

ive also seen a picture on hondatech of a wiseco piston suffering severe slapping... that the W on the side of the piston actually wore off and were badly scratched.

up to u which one u wanna use. talk to ur mechanic if need be. im not sure if u get 84mm forged do u still need to bore a little for the wall clearance or not..

as for the TX3 pistons, it was pretty common to use it in B20 a long time ago.. nowadays, i rarely hear of anyone using them.

other options cast iron are RS Machine and YCP pistons. both only available on the internet and outside the country...mostly on ebay. both have the same exact design: B18C-R design but with different sizes. should give u around 10+ compression. the YCP is significantly cheaper than RS Machines (which has alot more good feedback, barely hear anything about the YCP either postive or negative)...but recently i found a set of used RS Machine pistons on mudah HERE

another option for cast iron would be the stock F20B pistons... these however are 85mm and will require a rebore.. also, the pistons need to be worked on by the machine shop in order to be fitted into b series to ensure clearance and fitment.

as for mahle.. yes theyre also reputed to be very good pistons.. and supposedly they also make the supertech (or was it CP?) i could be wrong though

 

[ddv_nk12]

Did you see the post on the H22 mods? Apparently, the stock pistons were modified. How and what is actually done?

Besides the strength of the pistons compared to forged pistons, are there any other problems for doing this?

Bro madman, what is your CR again? Is 12.5 CR okay for daily use? Or should it be lower? Will I need to use higher octane fuel (Ron97) if the CR is 12.5?

 

[mADmAN]

typically the higher the compression the higher the RON.

11.5 would be just nice for daily drive....but can still use higher la if u want.

yeah mod piston is quite comon... even b20 pistons sometimes modded to fit into vtec (deeper valve reliefs)

 

[mysayasan]

u should look into oil sump baffles as well..

the girdle is good to have but i heard quite a few things have to change like oil sump...oil sump studs etc etc....not too sure about this as i didnt install a girdle in my B20....but i did find an aftermarket girdle in the marketplace which looks quite interesting...

my b20 has the block guard as well as the baffle. i also balanced the engine and using ACL bearings.

this is how my block looks like after it came back from the machine shop for boring to 85mm and installing block guard

http://a5.sphotos.ak.fbcdn.net/hphotos-ak-snc7/297593_241238825912794_100000800350825_640928_1012802_n.jpg
*this exact block is for sale, me now on diff block, change setup*

anyway.. B20s + high rev usually dont mix... i wouldnt bother going past 8k rpm especially if ur using stock honda cams


btw, where did u get the YCP pistons? and how much are they? care to share the link?

seen this on hondatech ... regarding block guard on 85mm bore..finally sell the block uhuh