Hello I'm new here but let's get to it.
I want to build a b20v that will make power to 11k so far I bought a b20 block then I had it css'd by cnc werx
, a b17 crank

, & b16 head

. I plan on sending it to rjt to make it flow at 11k & Im thinking about buying skunk2 ultra cams since they claim to make power at 11.5k & retain vtec I'll buy the springs & retainers recommended. I really don't know what intake will help me with power up there any suggestions? But all together I should be at a r/s ratio of 1.74 & a displacement of 1847cc I would love input on my numbers for the bottom end I would need a piston with the dome size of 18.3cc & a 28.67mm compression height, rod length would have to be 141.4mm sitting on a b17 crank 81.4mm I would be 0.042in in the hole with a compression height of 14.50 let me know if this would be reliable on e85

 

...why?

 

Why what?

 

Why do you want to run a certain rpm? Seems like a dumb goal. I can see a certain hp or tq figure, but rpm? No care. As long as its balanced, I'd rather have a bigger displacement engine carry the power out. Rod stroke ratios are over rated with this platform. You're basically cutting the nuts off the b20.

As long as the tune is solid, 14 whatever compression is Ok on pump e85.

Id run the s2 race manifold massaged by 4p if I was starting from scratch.

 

 

I don't mind losing the displacement it won't be that bad & I think it would fun be having a motor that can make power that high. Thanks for the suggestion also I do aim to hit 225whp hopefully

 

I can't see why it won't make at least that. But in doing so, you're going to be at least 10tq down and thats a lot on these motors. Gl with your build, I'm following.

 

Thanks I appreciate it

 

Porting the S2 race manifold on a destroked motor might not always be the best option. The short runners are enough. Everything else though needs to work together. Those manifolds aren't as restrictive as perpetuated my friend.

 

I will most definitely keep that in mind thank you

 

Where is the data at? Why would you want something more restrictive when the goal of the pump is to spin north of 11k? Have you seen a s2 manifold up close? Slag city. You're never going to convince me thats better than being massaged without shared results.

 

He's using a 81mm crank so he already is at a disadvantage trying to create the velocity to even need more air flow. So from here he needs to figure out his camshaft selection as to how much lift and duration he needs on top of the header. I think making power to the rpm he wants is farfetched and is going to be a challenge getting his goal met.

 

Another factor is headwork.

 

Go buy a street bike.

 

I was plan on using the skunk 2 ultra camshafts to help with my power range http://store.skunk2.com/engine-tuning/top-end/camshafts/ultra-series-camshafts/b-series-ultra-series-camshaft-stage-2.html & I really appreciate the opinions it's very helpful

 

Not a big fan of riding two wheels

 

Then transplant a street bike engine into your car. Thats what you want anyway. 11k rpm, around 200hp, and not an ounce of torque.

My honest opinion?

Get an LS/B20 crank and build an 85x89 all motor beast. Sure it may only rev to 9k (maybe higher depending on the rods) but it will run circles around whatever it Is you are trying to do. If you build the same motor you are planning, but with the 89 stroke instead of that b17 crap, you are looking at an EASY 15-20ft-lb gain all across the board. An extra 2k rpm up top is NOT going to do ****. I highly doubt you could build a setup that will actually make real power up there, and last for more than a few hours.

 

Do you have a reason you want to spin a motor to 11k? Or is this a pee pee measuring thing? Just curious. I still get nervous @ 9200 w/ my motor....that's A LOT of RPM.

Lets put this in perspective. NASCAR motors are professionally built and blueprinted and they RARELY see 9k. They are specially built to run that RPM and are used once and rebuilt. You're starting to talk F1 type specs...out of shelf parts.

See where we are going with this? If you can make more power @ less RPM, great. All more RPM does is create more wear, and less reliability.

Your car/money do what makes you happy.

 

[QUOTE=F22Master;50627867]Then transplant a street bike engine into your car. Thats what you want anyway. 11k rpm, around 200hp, and not an ounce of torque.

My honest opinion?

Get an LS/B20 crank and build an 85x89 all motor beast. Sure it may only rev to 9k (maybe higher depending on the rods) but it will run circles around whatever it Is you are trying to do. If you build the same motor you are planning, but with the 89 stroke instead of that b17 crap, you are looking at an EASY 15-20ft-lb gain all across the board. An extra 2k rpm up top is NOT going to do ****. I highly doubt you could build a setup that will actually make real power up there, and last for more than a few hours.
Thanks I appreciate the honesty with my next build I'll probably go for ls/b20 crank

 

[QUOTE=93egSLEEPER;50627955]Do you have a reason you want to spin a motor to 11k? Or is this a pee pee measuring thing? Just curious. I still get nervous @ 9200 w/ my motor....that's A LOT of RPM.

Lets put this in perspective. NASCAR motors are professionally built and blueprinted and they RARELY see 9k. They are specially built to run that RPM and are used once and rebuilt. You're starting to talk F1 type specs...out of shelf parts.

See where we are going with this? If you can make more power @ less RPM, great. All more RPM does is create more wear, and less reliability.

Your car/money do what makes you happy.[/QUOTE
You have a really great point with that one

 

[QUOTE=revsforglory;50628009]Nascar Sprint Cup cars target rpm for the 2015 season is 9k done through hp and gearing. They see 9k+ consistantly. 2014 rules package had more power and saw near 10k.

Go #24 this Sunday!! The drive for 5 is alive

 

[QUOTE=43!;50628420]People still watch and follow NASCAR? jk...me and my red neck family still watch it too LOL. Chevy and Hendricks motors all day long baby!!

Anyways, what I'm getting at is those cars/motors are specifically built for that application with extreme standards and parts.

 

Hell yea! My wife got ME hooked. Shes into fashion, makeup, and #18 car. Two years ago I proposed and then we saw the Coke 600 that same weekend =p.

Sorry OP to crap on your thread. I swear I am done. Wish you the best with your goals. Ill look forward to your progress.

 

Lol its cool man no problems over here

 

18.3cc dome yikes!!! I'd like to see what that would look like lol