Hi I currently have a B20VTEC with all stock setup. I am going to upgrade the block with forged internals for turbo. I already have a set of Blox BXCM-10108 Tuner Series Type-C Cams lying around. but those dont clear the stock B20 pistons.

I am looking for suggestion on which forged pistons to use for my turbo setup that will clear the Blox cams

Camshaft Specifications:
Intake
Duration: 268° @ 0.04” Lift: 0.481”

Exhaust
Duration: 264° @ 0.04” Lift: 0.458”

 

Tip #1: Get some cams that weren't made by a 5 year old in Taiwan.

How exactly do you know they won't "clear"? Have you clayed them? Talked to a tuner?

 

Is the block sleeved? Stock B20 sleeves dont last long over 300whp

 

i used these on my 10,000rpm B16A build and made 200whp on 91 pump gas and ran smoothly for over 2 years. so maybe that 5 year old in Taiwan who made the cams did a better job in doing it than your interpretation of it!

I know they wont "clear" cuz i tried them on when building my B20VTEC

 

Its not sleeved, and my goal is 300whp without the sleeves. If i indeed plan to go over 300whp, i will definitely put the darton mid sleeves

 

If you are just aiming for 300whp, cast pistons will do just fine. I think the stock B20Z piston "PHK" in an 84.25 or 84.5mm bore will do you well. That would give you right around 10:1 compression, maybe a hair more. And yiu can get then for cheeeaaap on ebay. Full sets are like $120 with rings and wrist pins

 

i am already on 84.25mm PHK pistons. and i already mentioned that these dont clear the cams that I have.

I am looking for some info on which forged piston will "clear" these cams

 

there isn't a single reason why you should have valve to valve and piston to valve interference with those cams...

unless you have them timed wrong, haven't degreed them, or the block and head have been milled too much.

That's a fairly mild cam profile by todays standards... the only issue I might see is if you have oversized valves the valve reliefs in the piston might not be big enough.

you're doing something wrong.

 

We double checked the timing. it was perfect. i am using the std size supertech flat valves. block or head are not milled at all!

 

u were right. there was a timing issue with the adjustable cam gears. put them back on and properly timed. all is fine.

wondering how it will perform with a turbonetics 11023

 

Told you lol

Glad you got the issue resolved. What exactly was wrong with the gears and whose were they?

 

Thats probably too much turbo for what you are trying to do. You will be making 300whp at probably 6-8psi, but you wont reach full boost until ~3500-4000 rpm.

You would be much better off with a GT2871, or at least a T3 with the small housing (.48?). Unless you have plans to go bigger in the near future (350+whp) which would also mean you would need sleeves, then you should get a smaller, more responsive turbo and have fun.

 

Just sayin', I called it too.

 

the cam gear is some brand i got from Malaysia. In Bangladesh, we dont have the parts or the expertise...its all a trial and error method. thank god we have HT to look up to!

cam timing was perfected by setting at Intake +10deg and exhaust +6deg

I also saw that many ppl use s2s2 cams on b20vtec. my cams have slightly lesser lift than the s2s2...so theoretically these should not have any clearance issues as u said

 

i actually plan to upgrade the pistons and rods with forged. as the head is already built i can move up to 10k rpm if i am still making power there on the dyno.

right now, on the stock block with PHK pistons, i will be using a godspeed wastegate at 5psi spring pressure and have a turboxs hpbc to tweak the boost up. eventually my goal is to have between 350-400whp, or until my FIC 775s max out :p

anyways, isnt it usually like 10whp per psi of boost?

 

 

"10 BHP per PSI" is a VERY rough estimate, given to people who don't understand the complex math behind power creation. Want to learn the math? Read this.

Also, you're using a lot of cheap parts in places you shouldn't be. Godspeed and TurboXS aren't really names I'd be trusting under my hood.

 

TurboXS builds some good stuff... their piston type bov's leak like a bitch though

 

yes, their manual boost controllers are quite good i think. i also got the RFL BOV - cuz i loved the sound

anyways, what other BOV is good other than the ssqv?

 

the shipping alone, from US to Bangladesh, is an overkill. already spent over $6k including shipping for all the parts. only two things that may need to be replaced down the road are the godspeed wastegate with a tial one and the turboxs rfl bov if it leaks too much