I made this build for my brother as a teaching tool.
So i thought it might help out many people who were newer or just not sure about things.
I'll try to answer he questions best I can.
I love b20 builds. As mentioned by stealth get a 2.5" mandrel bent exhaust. Your current exhaust is killing you.
Well to be honest, I wanted to dyno it open header just to know where I would be with power IF i had a free flowing exhaust. But you must understand B vtec and B NONVTEC heads flow very different their for even if i'm reving it to 7500rpms it's not the same exhaust flow as a Bvtec head exhaust flow at 7500rpms. With that said I honestly think i might only gain 2whp with open down pipe if that.
Really nice build. How much did they have to mill off the head to get such a bump in compression? And what did you guys tune on? You could probably pick up a few horses with a better exhaust and a bigger throttle body but its still a great build.
Thanks for your kind words. My brother loves his new motor.
Since the b20b came with 8.8cr, we for sure wanted something higher to help with spool when boosted & not worried about running too much boost either.
So we decided to shave it by .055.....
yes that's a lot, but that's the only cost effective way to achieve what i wanted to achieve with out blowing the budget. Some people who didn't know shit "thought" it was a bad idea, but my head porting guy said it was a great idea because anytime you can shorten the quench area of the upper camber you'll get a tighter "space" for the fuel to burn/explode and drive the energy downward (which translates to power)
* note we did have to off set several items by .055mm as well since he head deck was shorter. This affected lower flange of header & ps bracket.
But it was nothing a dremel couldn't solve & a shorter V-belt at autozone.
It currently has a a Blox IM on it with the stock 58mm throttle body.
I had an extra 70mm tb in my collection of parts but honestly didn't think it was going to be a big deal. BUT after this dyno session i just might give that to him down the road.
A bigger & nicer exhaust would cost $300-400 min, and the gains would only be 1whp if that. So yes i could go with a nicer one but for now this works and I'm not sure many people would be willing to fork over $400 on a new exhasut if you KNEW it would only give you 1-2whp extra.
Keep in mind how you felt when you bought a $450 exhaust system that sounded cool but in reality it only gave you 4whp extra. yeah i hate that feeling.
Originally Posted by stealthpenguin
Nice build. How much did the machine work (rebuild) cost?
Powerband looks fun. But, with regards to spending money in the right place, I'm surprised you didn't splurge on a 2.5" (mandrel bent) exhaust.
The 2.20" crush bent exhaust was already on the car, so i wasn't too worried about it.
I'm very confident that with a stock b20 block it would only cost me $650 to replicate it.
BUT because the motor did have to be rebuild there was additional cost.
$99 = ACL race bearings mains & rods
$20 = ARP rod bolts
$90 = ARP head studs
$150 = 5 angle race valve job (includes refacing valves) Pat's my good friend and he did his own port work on his 277whp 2.2bvtec setup.
$18 = RMS spark plugs
$40 = milled head
$60 = fresh hone
$0 = labor was free
$0 = tuning was free
Btw how are those cam gears? I was gonna get em for my LS head.
They are just like the other $250 cam gears. They work fine and I've always been super cautious and used locktite on the studs for cheap insurance.
Solid... Must be fun to launch
Haven't tried it yet cause in MN the roads still suck.
I did buy him some 14" delsol rims which i will buy some slicks and have alex practice driving it at the track.
I'll be the first to say that I miss my b20z. That thing was just a big gob of torque all over and yours looks even better.
It was honestly more fun to drive than my turbo GSR.
yes i completely agree with you on that.
I remember i drove the hell out of a d16a6 motor around cones and super curvy roads and I could attack the corners with 90% confidence in my control adn the car was faster, i drove faster and felt good.
The following week i take my other ef civic out with gsr swap and drive the same roads and I felt scared to even go WOT, sure i had more power, but I also mentally limited cause I didn't know how to use this power. The car was slower and i felt more fusterated and drained at the end of each run.
There is something very special about driving a underpowered car FAST WOT than driving a higher powered car slow with limited throttle.