valve hone question

[deddth]

did a search to no avail, so i ask thee for assistance. i have a b18a1 engine and i bent some valves. hopefully in a couple of weeks i'm taking the head to a machine shop to get it fixed. while i'm at it i'm gonna ask for a 40thou mill, install valve seals and a 3 angle valve job. now here is the question. i also want to hone the valves, but i've heard mixed comments about it. some say it helps the combustion process, and some say that valve hone hurts the valves making them more susceptible to burning and committing epic fail. what's your point? should i ask for valve hone or not, and why? discuss.

[deddth]

any comments?

[mike_paz17]

No idea man! i wouldnt do it

[J.W. Racing]

If you bent valves, you need new ones. Take the valves with the head to the person who is doing the valve job on the head, so they can seat the valves for you. I never heard of Honing a valve, but I would make sure the person doing the head work Hand laps the valve seats to see how the even seal is. That should be done without question from a good builder.

[deddth]

maybe i'm using the wrong word... in spanish the word is 'esmerilar', to hone? resurface? does resurface sounds more logical than hone? is a procedure that leaves the valves shiny...

[J.W. Racing]

AH,
Yes when you get a valve job the machine shop should want the valves to cut them at the same time as well. So they are the same angles and can meet properly. Then it will be resurfaced as you say. Hope this helped

[deddth]

thanks man. so it's worthy to cut and resurface valves?

[J.W. Racing]

<div class='quotetop'>QUOTE (eddstein @ Apr 18 2008, 11:11 AM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=1554)</div>thanks man. so it's worthy to cut and resurface valves?[/b]
Its actually a must if one is to have a good seat seal, but you can Lap them as well and save some $. If you somehow burn a valve it wont matter if you cut them or not , its gonna burn, so dont worry about that. Get them cut so you have a good seal, thats one of the the most important parts to an engine... The seal of the valves. Have the machine shop cut the seats and the valves so they match angles.

[mike_paz17]

oh yeah i know what you mean now..yeah is worth it so you can get proper combustion from the whole head being perfectly and properly assembled and like JW said the valves meet properly, yeah get it done, its not expensive either!

[J.W. Racing]

Though hand lapping valves was once a common practice, the need to do so is much less today thanks to precision valve seat cutters. Even so, some performance engine builders still hand lap new and reground valves to make sure the valve has a perfect seal with the seat. A tighter seal eliminates any compression leaks and also provides maximum cooling between the valve and seat to prolong the life of the valve. This is extremely important in high revving high performance engines as well as hard-working engines of any type.

Hand lapping involves applying lapping compound (an abrasive paste) to the valve face or seat, and then using a suction cup on the end of a short stick or a power lapping tool to rotate the valve back and forth while slight pressure is applied. This smooths off any imperfections on both surfaces and results in a near perfect seal. The area of contact between the seat and valve can then be checked with Prussian Blue to see if any additional lapping is required to clean up any gaps that may be left.



I used this and did it my self. A GSR head that was smoking seals perfect now. and I did it in house for free.
http://www.autopart.com/TOOLS/TOOLSMAIN/tool/T_2224.htm

[deddth]

thanks again. you're a very valuable member here. same to you, mike.