1stGenCrxRobby

My B20V Build

Gsr head
-Skunk2 Pro intake (ported)
-Omni Power 70mm TB
-Skunk2 Pro3 cams
-Skunk2 cam gears
-Skunk2 XP Valve springs
-Skunk2 Titanium retainers
-Skunk2 LMA's
-RC 440cc injectors
-Flat face valves (STD size)
-PLM Big Tube 4-2-1 header
-ARP head studs
-Port and polished head
-Shaved .003 of an inch

B20b block
-85mm bore
-CNC Werx CSS
-Supertech 12.5.1 pistons
-Eagle rods (ARP bolts)
-Endyn block girdle
-12.5lb flywheel
-Golden Eagle b20v kit
-OEM B20b crank 89mm
-Balanced rotating assembly
-CTR crank pulley

Fuel: e85
Transmission: Ys1 cable Gsr
Chassis: 85 Crx
May run a wet 50 shot.
Power goal off the bottle is 240-250whp & 160-170wtq.

What do you guys think of this setup? Would I have p2v issues along with v2v with the cams? Will sleeves hold up at 85mm with CSS?

Twin Cam

You're gonna need bigger injectors to run e85.

1stGenCrxRobby

What size u recommend?

Twin Cam

I run 750's on my setup. If you plan on spraying i'd go with 1000's just to leave yourself some room to play.

43!

iTrader: (3)

Ditto on the injectors. I don't think you have the compression for pro3's. I have pro2's and I think they suck partially because I dont have enough compression to push them (12.25-ish). I wouldn't use a ctr crank pulley. I wouldn't bother with CSS. Other than that, you should achieve your goals.

PSI GUY

iTrader: (2)

If you are going with pistons to increase compression, why go with the flat faced valves. You are just adding weight to the valve for no reason, normally people use the flat face valves to bump compression up, unless you are getting a good valve job that will drop the valve in the seat a bit.

1stGenCrxRobby

12.5.1 pistons not high enough for pro3??? I've read you can get away with 11.5.1 on a 84mm bore

1stGenCrxRobby

Valid point

ChrisCoupe1

Just curious is this car going to be a weekend/track vehicle with minor street duty or more of a daily? as for fuel injectors technically around 575-625CC/min is good enough for E85 with about 85-90% duty cycle but going bigger to 750+ is good because A it lessons the stress on the parts and B if you live somewhere where it gets below 40F it will make life alot easier on cold starts since E85 needs like 2.5 times as much fuel as gas just to start. As for Pro 3's thats alot of cam with alot of lift for your build considering your combustion ratio and P2V clearance is going to be pretty tight with not alot of room for positive adjustment. I'm sure many would agree it would be better overall to have a somewhat smaller cam that you can get the most out of instead of having big cams that may be limited in overall flexibility.

vtecmaster85

Sounds like a good build mang! These guys are right 440 and E85 won't work. I maxed rdx 410's with my b20 vtec on just low came alone and by the time high cam came I was Well over 100 duty cycle. Changed them out for 750cc and power went up lol. In a 1st gen rex this powerplant will be more than enough!

1stGenCrxRobby

Track car, reason why I'm going with pro3s is because I picked up a legit set for $300. Would a thicker head gasket gain clearance wirh oiy sacrificing compression?

Codyv17

Pro 3's will be fine for this build.. Im also building a very similar b20v with Pro 3's. Ive come to realize that majority of people will tell you that you need stupid high compression for them and ive also come to realize that non of those people have ever actually ran pro 3's. They just assume there "too big". Which is completely false. Ive spoken to multiple engine builders and tuners. 12-12.5:1 compression is fine.

1stGenCrxRobby

Thanks for the info!

ShinsenTuner

iTrader: (1)

Besides what has already been mentioned, I'd say a block girdle isn't really necessary but a nice option to have anyway. Does the Endyn one require you to run a GSR pan like the Z10?

I have a B20 block from CSS and while it's a nice setup, if I could go back I'd probably just buy a sleeved GSR block. The oil cooler, squirters, and OEM girdle would be nice to have.

1stGenCrxRobby

Endyn block girdle requires no machine work. Just Gsr wedge tray, pick-up tube, pan, etc...

Sleeves is to expensive lol, that's why I choose CNC Werx CSS

ChrisCoupe1

I'm fairly certain that the you will loose roughly .5-1 full point of Compression running a gasket that large, as far as gains in P2V clearance there would be little once the head is correctly torqued to the block. Also I know I've read that trying to alter compression ratio's by putting thicker HG's is dangerous because it can affect the seal(this is more to do with people who try to create a super thick one by stacking 2 thinner ones) and of course compression ratio but also as well 2nd issue is that such a thick gasket can create hot spots due to the greater area of non cylinder wall or head combustion chamber zone exposed to the heat which could lead to detonation, some of that potential issue will be avoided thanks to E85 but there would be potential for it. Anyways my personal issue with Pro 3's is simply they use high lift to create power at risk to p2v clearance(which any good engine builder worth his salt will know what to look out for and know how much timing can be adjusted) I personally prefer a cam with slightly less lift but greater duration..but that's just preferance

birdd

I have a similar build going on, 12.5 manley pistons, fully worked head and a cam comparable to a pro 3, blah blah etc. I have checked p2v and v2v clearance with a .030 head gasket and saw no issues. I am also running a flat face valve simply to gain the extra compression in the chamber, every bit helps since i did not go with a bigger cc dome on my piston. Your build looks solid though

1stGenCrxRobby

What dome CC are u running?
Supertech 12.5.1 are 5.5cc dome and 30mm comp height

birdd

Mine is a 4.8 cc dome. I did some chamber work on the head which made them 48 cc, I still need to mill the head so we'll see what I end up with. If I could re-do it I would have gone with a bigger dome on my piston.