just wondering how many of you running a b20 or b20vtec have sprayed 50hp shot or bigger more than 100 times and it is still running ok


I'm building a motor and looking to run ~200-205whp all motor and a 50-75 shot of nitrous. Trying to decide if a gsr block with ls crank or b20 is the way to go, would like the added displacement of the b20 but not if its going to have cracked sleeves from the nitrous. 5% more displacement is not worth that.

I'll be running forged pistons and eagle rods but stock sleeves either way. Probably just go with a simple wet kit for the 50 shot but will go to a direct port setup with separate fuel cell full of 116 if I spray 75-100 hp shots.

just how much stronger are the b18 sleeves than the b20 sleeves?

this is my first real motor build so sorry for the noob questions.

 

about 2 years ago i ran my bone stock b20b on a 75 shot and a street tune **** handled it lovely. lol h/i/e blox im and 65mm tb.

 

awesome, thanks nels. I have a feeling that the b20 sleeve thing is probably slightly over blown and that for <100 shot as long as rpms are <8k rpm then I should be ok but I want to hear confirmation from guys like you before spending $3k on it. lol

you ever dyno that b20b nels?

anyone spraying a more built b20 bottom end?

 

no never dyno'd it just street tune. 13.9@97 w/o button and 13.3@101 on button. vx eg. on drag radials. jdm itr trans. stg 2 unsprung clutch kit and 9pd fidanza also on it. it was a fun little setup.

 

wow, that is much faster than I expected, hitting 13s all motor no vtec on a build as mild as that is impressive. I bet from a roll that simple setup would run down stock ls1s on the button... nice. with a vtec head and higher compression pistons you would have been low 12s on the bottle probably.

 

ya it was fun lol. the hatch was gutted also only had dash door panels and front seats nothing else.

 

well I just found a stupid deal on a built b20 vtec with eagle rods and some toda cams for $1000 so going to go pick it up tonight unless anyone here thinks a b20 will not last on a 50-75 shot.

 

hopefully you can spot the eagle rods on em...
or know the person really well...
friend baught a motor with ''internals''..opened it up..bone stock motor inside

 

B20b/z dont like detonation so watch your tune

 

i ran a 60 shot dry on a b20/vtec stock bottom end all day, all night, bottle after bottle after bottle. i added a couple things before i started squeezing for safety reasons, like a bad *** fuel pump and i took 4 degrees of timing out. that is pretty much it.

 

If your going to really run a seperate cell of C16 when you spray, you will be able to run a much higher shot then 60-75. Depending on a few different varibles, up to 175 shot perhaps more. There is so much that depends on the tune and other conditions. Then again when you are spraying that much juice, bottle pressure for back to back runs is going to be an issue as well as $ for refils not to mention traction. Staged setup anyone? lol

Still fun nonetheless. B20 BTW tuned can take the abuse. If you need more info, feel free to PM me.

Have fun and good luck

Blaze

 

so just got off the phone with Endyn and they said they don't recommend ANY nitrous on a b20 at all. seems to contradict what's going on here but I didn't feel like arguing with them. I'm going to just spray a 50-75 shot anyway and pour some c16 in with my pump gas for added safety when I spray.

2 more questions:

1. what are the symptoms of cracked sleeves? that's what happens to b20s when they die usually right?

2. where can I tap the fuel system for my wet kit that is hidden? I live in CA and smog/cops are ***** here.

 

i ran 100 shot on my jdm b20b from engine depot for a hole summer then did a 150 shot one all tuned on water meth kit still running today in a em1 b20vtec!!!!

 

that is bad *** man. stock sleeves right? are you running even forged pistons/rods in that? that must be one helluva tune!

 

I'm planning to nitros my b20b with high compression pistons acl bearings n etc but my frens doubt my vision

 

Is it safe to run high compression pistons witg acl bearings n etc on 75 wet shot on nitros

 

These people should be immediately banned.

 

If it’s all built correctly and fuel isn’t lean or rich.

 

I've always heard (but never had it explained why) that nitrous actually prefers higher compression engines. Possibly something about the compression + cam combinations resulting in better profiles and combustion for the nitrous but I have no idea. I'm sure the powerband would generally be better especially in the low end before the injection point if you had higher comp, and you could possibly get away with running a smaller shot to reach your intended peak power.

 

Yes that’s my understanding. Nitrous operates cooler, so a higher compression ratio works better. Almost like an all motor set up, but with nitrous on top.

 

Man, go look up my first post. I was that guy.

While I agree it's super annoying and that most of them fade away after a post or two, there is a *chance* that one may stick around and learn something.

 

I'll give this an honest chance for a while, but it may be closed if this person is looking for just "quick solutions". Rather sad, really.