b18 non-vtec+big boost
 

im ordering my new valvetrain pretty soon and wanted to know if it would be worth it goin gwith oversized valves.secondly, is it even worth buildign the non-vtec head. later on i plan on buying the crower turbo cams for it too. im just worried that it will be a limiting factor.

Re: b18 non-vtec+big boost
 

i Have herd that those heads flow like ----, you might look into getting a port and polish job in the bitch

Re: b18 non-vtec+big boost
 

stock form not the best.valave job/good port gonna outflow a stock dohc vtecaa head. Chris aka xencron made good whp on his set up

Re: b18 non-vtec+big boost
 

Good valvejob, but no portwork, and you'll flow as well as OMG VTECH.

It's all a stupid numbers game. Just go with some nasty cams, rev to 8K, and boost the ---- out of it. Portwork is not needed, compared to the cams.

If you want the oversized valves, go for it, but if you go too big you end up with the bowl/seat being mismatched to the valve and you don't get any more flow off of the valve size. Intake valve is the bottle neck at big boost.

Re: b18 non-vtec+big boost
 

for once i agree word for word with you! valvejob gets you 90 percent of your gains, but you cant see it like you can a bling ass port job so you wont get much respect on HT. in a FI motor i dont honestly think OS valves arent really needed, i dont think the gains you will get will be worth the machining and money. honestly to quote jdavis just crank the boost up a little extra. cams however seem to make a huge difference so for sure invest in those.

to give you an idea of what a valvejob can do MAXCFM on hondatech is getting 300cfm out of a h22 head with only a valvejob.

Re: b18 non-vtec+big boost
 

o/s intake valves net 30-40 increase in "hp-psi" at 300-350 whp range. Same as running a JG Edelbrock IM at that power range. Demonstrative of flow, nothing more. As for them actually being *needed*... well, althought plenty of people have gone lots higher, I'd halfassed guess based on nothing around 450-500 whp you'd want o/s valves to prevent unwanted restriction/friction/heat. If you wanted to spend $1.9 million dollars and try to make a 500whp ride "reliable" wtf that is in turbo Honduh fantasy land.

H22 gets 300 cfm because it's essentially a K20 without a faggot intake cam that flops around like a limp wrist.

Re: b18 non-vtec+big boost
 

take another look at the 2 heads.... theres a few things different besides just that. the h22a head is actually closer to the f20c head.

Re: b18 non-vtec+big boost
 

any write ups on valve jobs?

Re: b18 non-vtec+big boost
 

So essentially a better cam set is what it all boils down to? I'm gonna be doing a b18a1 swap over the next few weeks so i'd like to see what are the best things to do flow wise to this motor before i get my turbo slapped on it. Is it possible to use a different non-vtec head to achieve close to the same results as vtec head?

Re: b18 non-vtec+big boost
 

You can drop the $$$ for a P8R head that has 33mm intake valves, like the V-Tech rides.

I think the chamber is already opened up on those to accomodate 84mm B20B/Z bores. I could be wrong. I do know for sure that it is a different cc combustion chamber.

Personally, I'd grab a good set of cams, boost that biotch, rev to 8 grand, and call it a day.

Re: b18 non-vtec+big boost
 

the p8r head does have an 84mm chamber, i personally belive it has like a 43-44 cc chamber compared to the 45cc LS head and it flows 20 cfm more than a regular LS head stock for stock. however you shouldnt buy one untill i do since they are super rare and i got dibs...

but yeah again im with jdavis "grab a good set of cams, boost that biotch, rev to 8 grand, and call it a day."

Re: b18 non-vtec+big boost
 

i talked to my machinest. he said 200 thats including old guides pressed out and new ones pressed in and a 3 angl valve job and overbore if i decided to go with bigger valves. im thinking 1mm over with nitride coated stainless valves. also gonna run tit retainers and dual valve springs. ill just give it a mild pnp with the summit porting kit. im not gona gut the ---- outta it, just match the ports with the exhaust mani and clean up casting marks and debur.
my goal is about 400-450 with my built bottom end with an sc61 on pump gas.

Re: b18 non-vtec+big boost
 

3G Piglude intake valves are 33mm, and have the correct stem and overall length. Bowl needs worked to suit a 2mm increase in size.

Supertech makes "stock" sized replacements for those engines.

From a flow aspect, go with Omni's valves. Brad Z says they flow the best on the market.

Re: b18 non-vtec+big boost
 

i dont think omni makes stuff for non-vtec. im probably gonna go with kms engineering parts. they have a full kit and they said they would swap there block gaurd with the guides i want
http://www.honda-performance.com/valve-train.asp
http://www.honda-performance.com/npr...Valve%20Guides

Re: b18 non-vtec+big boost
 

I was looking at KMS. They have an awful nice valvetrain deal, considering it for D-series. If they trade blockguard from the combo for valveguides they have my business.