throttle body overbore, upgraded valve springs?????

[racerhex]

Ok i found a throttle body overbore and set of upgraded valve springs
for my car what will these do performance wise to my car and engine wise as in lasting...and overall drivability? Any info on these moods is needed? Also could I do the overbore myself if I knew a person that does that sort of thing what needs to be done explain a little please, and is there anywhere else where I can get valve springs?

[goodcookiedrift]

performance valves are usually bigger, lighter and stronger and/or all of the above. bigger the valve = better breathability, lighter = less wear and stress on the rest of the valve train components and stronger = increase the durability of the valves to withsatnd higer rpm, boost, etc.

Ususally, bigger valves and stiffer valve springs go hand in hand....having big valves and stock springs is kind of like having killer running shoes but weak ankles. and in most cases, the valve seats have to be modified when using larger valves.

an over bored tb does produce results. its been dynoed and sometimes the results are huge, sometimes they're insignificant...just depends on the application.

I would not suggest you over bore your own throttle body unless you are 1) an extremely adept welder 2) very precise cutter 3) mechanically inclined 4)have access to either stainles or aluminum tubing

[racerhex]

Ok cool thanks for the help do you have info or a site where I can find out how to over bore the throttle body because I have friends that know what they are doing! I reall would like to give it a shot! PLease email me with instructions if u know how others wise please post atleast site where i may find out how? Also how would u know how much to bore it out?

[boroEF]

Originally Posted by racerhex

Ok cool thanks for the help do you have info or a site where I can find out how to over bore the throttle body because I have friends that know what they are doing! I reall would like to give it a shot! PLease email me with instructions if u know how others wise please post atleast site where i may find out how? Also how would u know how much to bore it out?

basically a bored out tb is only going to give u improved engine response... it isnt going to get u any significant power gains because the air will always have to go into the intake manifold and it will be once again restricted in there.

[racerhex]

throttle responce is good...right?!?!?!? So I now I need to find out how and Im in...LOL if anyone has any info please help...i know i need to bore it 3mm, but anything else is uhhhh donno?

[Deep]

GoodCookie, hes talking about the valve springs alone, not up sized valves themselves, though you are right.

Racerhex, Listen man, the biggest restriction on that motor is the head. Its an economy head designed for low end torque, plain and simple. If you plan on doing anything major to that motor, invest in good machine work and get some good cams. Unless you get some serious airflow through that thing, all the bolt ons in the world won't make it fast.

[racerhex]

I plan on getting everthing for my car cams and all but I just have to work with the flow of my cash uknow...what would I have to change if anything If I bored it out? LIke anyithng fuel wise?

[Deep]

:roll:

[racerhex]

give me a break here man? Im trying jsut like to get small things and save for big things cant stand to not have something on order...allways like to add stuff plus if I can do this for free on my car mise well right if it helps and dosnt harm? :-?

[Deep]

Do yourself a favor and either get ahold of another engine to build or do everything at once, it'll be cheaper.

Upgrading your valve springs is pointless unless you have upsized valves. To install new valves, the head has to be removed to be machined. Since you have the head off, why not get it flowed and worked? Ported for sure and a 3 angle valve job. Maybe even have it shaved to up compression if you're going n/a. While you have the manifold off, why not have it ported and polished? etc, etc, etc.

I don't wanna punk you here man, but you gotta read up on how an engine works before you turn a single bolt on your motor. You'll learn that the job that an engine does is suck air in and then pump it out, much like your lungs. The byproduct of this is rotational energy created by spinning the reciprocating assembly (pistons/rods/crank.) This power is then sent through the tranny and to the wheels. If you understood all that, then its a no brainer that more air moving though your engine = more HP.

Ask lots of questions (thats why we're here, right?), but try to do a bit of research first, it makes you look smarter and more people are gonna be willing to help a brotha out if you come across as being serious.

Hope it helps.

[racerhex]

ur not punking me out and this is where I do my research...and trust me I look other places but I like it when people knowing camrys help me directly....and im not turning a damn thing on my car without my friends help he has been turning bolts on engines for 35years of his life! I just like to find out a little specific questions about my car and trust me I aprriciate ur help a lot man...and I thank u for taking the time out of ur day to answer some little 18 year olds questions....I do thank u and sorry for asking so many but thats how I learn Q and A man but ur right more research first wouldnt hurt me a bit! One thing is for sure this is the engine Im worknig with, what is the point of working on an engine that everyone else in the whole damn world works on, like a honda or a mustang sorry not my style...if it hasnt been done then its about time someone does in my eyes...u know what im saying! But sure it takes time but I have time...I dont mind being a person that askes a shit load of questions because in the end I can answer someone elses just like u did with me. So thanks because without u guys I would be FUCKIN LOST!!!!! :P

[goodcookiedrift]

first of all....you don't need to do a valve job or port and polish to replace the valve springs....just take off the valve cover, un bolt the head bolts and voila...head off....a 2 x 4 and hammer later and the valves and springs are out....

HOWEVER....upgrading valve springs on a relatively stock valvetrain WON'T do any good...in fact it can do bad....

stiffer valve springs can cause more stress on the valve train components because of the taughtness of the spring. In other words, more wear on the cam lobes, the shims and the valve. not bad...but not the headache you need.

secondly, over boring a throttle body CAN increase hp and torque depending on the application...for instance, Ultimate Racings overbored TB for the s2k gains 5hp overall and 15 more ft/lbs of torque at 4000....this was dynoed so there is no fumbling in numbers. Likewise, it can also have repurcussions if youdon't know what you're doing. and seeing, that you are asking us how to overbore or whats best, i would suggest you not do it. Because if you did know what to do, you wouldn't be asking the questions.

tuners know how much to overbore because of 1) experience and 2)dynos....don't try a shadetree attempt at overboring....

Nick

[Deep]

Originally Posted by goodcookiedrift

first of all....you don't need to do a valve job or port and polish to replace the valve springs...

I think you mis-read my post.

[goodcookiedrift]

Originally Posted by Deep

To install new valves, the head has to be removed to be machined. .

it doesn't have to be machined....but like you said...there's no point in taking it off unless you're gonna do major work to it.

however, on the contrary, head removal is not hard, or difficult, at all...it is time consuming though...its just a matter of knowing your bolt patterns and torque specs.

Nick

[Deep]

I'm almost 100% positive that the valve seats would need to be machined to accept the larger diameter springs.

Again you're right, if you have the patience and a shop manual, the head removal isn't hard.