The B20VTEC discussion thread

[.Dave]

Wondering knowledgeable peoples top 3 picks for b20vtec (b20b8, standard bore, b16 head, cams/springs etc) for pistons and rods, any I can buy locally or better off getting elsewhere, cheers

[stndrd]

Dave send me a PM and we can talk about a few things

[cbauto]

Dave send me a PM and we can talk about a few things

You sound really desperate.

Not selling enough PLM and penrite?

[.Dave]

Hey guys,

just after information/experiences/thoughts on using this piston/rod combo on my b20vtec, are the JE pistons decent?

What other pistons (looking at 84.5mm) do you recommend, with about a 11.5.1 compression ratio

[tinkerbell]

yeah, stick with quality US parts and you cant go wrong, 84.5 is good, 11.5 is OK, but 12.5 is better,

but you must match your cams, head porting and CR to get the best outcome.

the quality of machinist you use is also very important to the end result.

like has been said ad nauseam through out this threa...

[.Dave]

yeah, I was just thiking 12.5 might be a little extreme for a daily

who is the general go to guy for b20vtec machining and the like

[tinkerbell]

12.5:1 = free power.

as long as you can get 98 octane, have a very good engine tuner and support package (like good injectors, fuel pump(s), ignition system, ECU, etc) you'll be fine.

my engine tuner organised my machining, so i cant say...

[cbauto]

Running 12.7 on 98.

Daily driver. 1.8 though

[.Dave]

True. I'll look into it, I don't want to have to upgrade too much

[eekayfo]

bigger bore/stroke also means that you need less of a dome to achieve the same c/r compared to a b18 or even more b16. huge wedges all up in the chamber can mess with cylinder filling and flame propagation. now im not saying more c/r is bad, or that huge wedges make things worse just its good to know what affect changing something has. much like something that helps the engine breath at high rpm, can hurt it down low... the beauty of c/r is its effect on performance is not rpm dependent, unlike alot of engine components.

if you dont want to spend too much, rs machines are hugely popular cast pistons. and you can get close to 12:1 with a p72 head and some head and block milling. half the price of forgies and give you a nice bump in comp whilst keeping it safe for the street.


are you getting cams?

[.Dave]

yeah I was looking into the rs machines too

im thinking of kelfords, but not sure, eventually I do want cams, yes

[gbpracing]

yeah I was looking into the rs machines too

im thinking of kelfords, but not sure, eventually I do want cams, yes

Stay away from Kelford Cams, I was originally looking to use them but found the support and delivery times as slack.
I went with Toda C2 for my build and got very good results.
Cheers