q8delsol

hii
i have a srange question, some ppl use oversize valves and some not

when i can use oversize valves and why some ppl with high boost cant use oversize valves??

StreetEG

im in for a good explanation--

philosofy1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by q8delsol &raquo;</TD></TR><TR><TD CLASS="quote">hii
i have a srange question, some ppl use oversize valves and some not

when i can use oversize valves and why some ppl with high boost cant use oversize valves??</TD></TR></TABLE>

to me it would seem that the reason people who run turbo don't use over sized valves are because the engine is moving faster, right? i mean the whole danger to using over sized valves is having the valves catch each other causing catastrophic failure to the engine. i don't know, but this is my theory. just the fact that they can catch is enough for me not to use them. it would suck to spend thousands on a motor and have it go for a stupid decision like over sized valves.

q8delsol

mmm if that reason right
why the shops make a oversize valves i mean if i have a small engine with 150hp should i use the oversize valves and when i make it 400 -500 hp i replace it with stock size i dont think
so u r wrong
any one else know?

philosofy1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by q8delsol &raquo;</TD></TR><TR><TD CLASS="quote">mmm if that reason right
why the shops make a oversize valves i mean if i have a small engine with 150hp should i use the oversize valves and when i make it 400 -500 hp i replace it with stock size i dont think
so u r wrong
any one else know?</TD></TR></TABLE>

WTF? you asked why, so i gave my theory! since you know so much what part am i wrong in? oversized valves don't really do **** for any motor. the percentage of HP gain is so minimal it's not worth jeopardizing a motor.

just because a company makes them doesn't mean you have to use them, i mean come on noob, i would of thought you had that much common sense.

q8delsol

i dont know i believe the valves catch each other but i dont think that the only reason!! if any one want to use oversize valves sure he will calculator between the cams and the valves but when i can use it???

philosofy1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by q8delsol &raquo;</TD></TR><TR><TD CLASS="quote">i dont know i believe the valves catch each other but i dont think that the only reason!! if any one want to use oversize valves sure he will calculator between the cams and the valves but when i can use it???</TD></TR></TABLE>

what is it you're trying to do. oversized valves can and will catch. you have less of a chance in low rpm's, but the higher you go the greater the risk.

why are you so heart set on oversized valves? what motor do you have? what do you want to accomplish with it?

q8delsol

i have a JDM B16a and i bought skunk2 camshafts pro2 and oversize valves but when i ask alot of ppl
they said u cant use it will catch each other so now i replace my oversize to stock size and pro2 to 1
i know it stupid plan when im thinking oversize valves = over power
so i want know when can somebody use the oversize??

philosofy1

you can use them when ever. i have seen people use them on N/A engines, but IMO, for the safety of the motor it's really not worth it.

as for your stage 2 skunk cams. they were fine. you can use the stage 2 on your set up, but replacing the valves are recommended, but not to oversize them.

q8delsol

the pro 2 cant use with turbo but the pro 1 can use with turbo
and my next step searching for turbo so i replace the pro 2
next monday i will get my valves and camshafts
and i talk with the skunk2 and the guy tell me use pro1 with stock size valves

philosofy1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by q8delsol &raquo;</TD></TR><TR><TD CLASS="quote">the pro 2 cant use with turbo but the pro 1 can use with turbo
and my next step searching for turbo so i replace the pro 2
next monday i will get my valves and camshafts
and i talk with the skunk2 and the guy tell me use pro1 with stock size valves</TD></TR></TABLE>

i didn't know you were going turbo

was thinking more like all motor. but yes, in that sense then the stage 1 cams and the stock sized valves would be your best bet.

q8delsol

thanks dude
u know some great site for turbo kits?
cuz im from kuwait and i dont know from where i can buy turbo in the net

Falqon

Wow, this thread should seriously be closed for being completely filled with garbage.

They make oversize valves for the same reason they make oversize pistons. You re-drill (basically) the cylinder walls to make them straight again and the hole is bigger, so you need bigger pistons. You do a lot of valve work, and that'll result in a oversize hole too, so you'll need bigger valves. It results in slightly more performance, but the much bigger emphasis is the increase in performance done on the cylinder head to justify the oversized valves.

q8delsol

They make oversize valves for the same reason they make oversize pistons.

so u say if i use a bigger piston should i use oversize valves?
i dont ask about how to do that i asking about when i should use it?
i think when the piston bigger should use stock size valves!
i dont know why but i dont think not for the same reason like oversize piston!

bigbadboy

the more air you can get it the more power you make.

tshracing

The reason ive noticed people dont use oversized valves are because you dont necessarily need them. You would use them when you want more airflow. But using oversized valves like 1mm oversize you need to spend much more replacing the valve seats since stock intake valves are 33mm and the seats wont hold any bigger than 33.5mm. But the exhaust valve seats will except oversze without new seats. So if your going for high hp go for it, otherwise leave as is.

hondachris1994

I have stage 2 cams and 1mm oversized valves in my b16 and never had a problem at all...BTW oversized valves give you more compression=more power

q8delsol

can i do it if i have a turbo?

hondachris1994

I wouldnt suggest it because like I said it raises compression and on turbo cars u wanna keep low compression

fmrprojects

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bigbadboy &raquo;</TD></TR><TR><TD CLASS="quote">the more air you can get it the more power you make.</TD></TR></TABLE>

yes thats true but from what i've seen ported heads flow much better with standard size valves

q8delsol

ok thanks for the info.

q8delsol

but i want ask u if u want a turbo what u should doing with ur oversize valves??
change the head??