The B20VTEC discussion thread

**Benson** · 05-07-2010 08:38 AM

Damn you guys are getting way tooo technical. Just keep the build simple and learn of other ppl in the states or locally that has done it. There is no need to be creative when it comes to an engine build, unless you want to throw thousands of dollars out the window and look forward to dissapointment.

As for headers, 4-2-1 or 4-1 same deal. If the headers isnt designed well, then both will make poor power. Check out those cheap Tri-Y's. They are the best bang for buck headers out there. Works very well on most b20vtec

**tinkerbell** · 05-07-2010 09:57 AM

Originally Posted by ewendc2r

Do you give it a hard time reguarly or do you putt around town and only give it on the track???

I won the 2007 NSW Supersprint Championship in Class 3B with it.

**tinkerbell** · 05-07-2010 10:10 AM

Originally Posted by ewendc2r

Now we're talking! Thanks Adrian..

Hmm .. I'll consider the itr crank again now...

just build a B18CR engine...

With regards to exhaust since we want to maintain high velocity to create torque, I'd imagine the restriction in my 4:1 header bs big tube would promote mid range torque with limit on top end power ... Ie reach maximum velocity at a lower rpm due to increased displacement and aggressive head pattern?

you will need a custom header designed for your combination to produce the best results.

Reason I wasn't concerned about oversized intake valve was

oversized valves reduce your camshaft options, is that really worth it?

**Chr1s** · 05-07-2010 07:25 PM

I had a look at the head his looking at, it's certainly a hardcore head, i'd stick to standard valves, 0.5mm+ at most so I can retain the adjustability and cam choice, but whats done is done.

I agree, if your really paranoid, rebuild your B18CR as I did mention

**ewendc2r** · 05-07-2010 10:24 PM

Apparently guy who was using it had no clearance issues up to skunk2pro1 so that's likely what I'll use to be on safe side.. Still plenty aggressive. Only intake valve is oversize, I hear main issues come from both valves being oversizsed.. Not saying it isn't close though.

**Chr1s** · 05-07-2010 11:35 PM

There's a fair few people who get custom ground intake cam to accomodate more clearance for cam gear tuning later on, but you'll be fine..

There's a stroker motor running the same spec head with pro3's putting down like 300whp.

**GSi_PSi** · 06-07-2010 12:06 AM

man people get way to technical , just build your engine dont look to great into this ratio and this ratio, its not a racecar which will see 10,000rpm constantly, build your motor, tune it properly and call it a day.

**ewendc2r** · 06-07-2010 06:47 AM

It's ok to want to understand things ... I was advised to research, now I'm researching too much?

**TODA AU** · 06-07-2010 08:22 AM

Originally Posted by Chr1s

There's a fair few people who get custom ground intake cam to accomodate more clearance for cam gear tuning later on, but you'll be fine..

Cough... Bullshit!
LOL

Originally Posted by GSi_PSi

man people get way to technical , just build your engine dont look to great into this ratio and this ratio, its not a racecar which will see 10,000rpm constantly, build your motor, tune it properly and call it a day.

If you don't pay attention to finer details, you end up with very mediocre performance.
Ask Tinkerbell if he wasted any time working stuff out on his latest build...
Slap it & you get a 120kw dud, or do it right & there's 30+kw there for the taking.
It's all about combination & the devil is in the detail.
Nothing mentioned so far is in anyway "too technical"; far from it...
Deliberatly vauge would be more to the point.

Originally Posted by ewendc2r

It's ok to want to understand things ... I was advised to research, now I'm researching too much?

Unfortunatly the internet gives people with no idea the same credibility as those who may well be experts
I hope you havn't spent any money on parts yet....
If you have, I'm sorry but you are heading towards building a dud.
Anyway, 1st thing. You need to sort out your cam choice & the rest swings around that.
Currently you have chosen poorly.

**ewendc2r** · 06-07-2010 09:38 AM

Adrian -- Can you care to explain why based on what you know about the proposed build?

Benson says -- Do your research and copy setups in the USA that have proven to work.. His setup works obviously. The setup I am proposing has been used also, with success?

After trolling through the all motor threads the get an idea of power levels and builds required, I see that the most effective builds with over 12:1 compression, all have ported heads & big cams for the 2L (still with max power around 8800-8900rpm)..

No I haven't bought anything yet but am very close .. I'd like to understand why you think this build will be a dud?!

The people I am 'relying' on seem to have considerable credibility and have been around building engines in the states for a long time? (DonF is one, I'm sure you've come across his posts in Honda-Tech?)