hi guys im running spoon bumpsticks on my obd1 b16a... 14111-16b-G00 intake and 14121-16b-G00 exhaust. what valve lash would u recommend for me? im running pct b16b pistons and a milled cylinder head( 1mm) which is kinda high.. heheh anyways what would u think would give the most power top end wise for me? my mechanic wants me to run straight .012 on the intake and exhaust lashes i was like **** man are u serious..ehe anyways gurus out there pls help me..

 

stock specs........006-.007 on intake.... .007-.008 on exhaust.That mechanic must be an oldschool domestic mechanic or somethin.i hope you have access to race gas if its gonna be a daily driver.


[Modified by aeolus, 8:12 AM 7/25/2002]

 

wow man that extreme... is that " or mm?
.12mm is too small that like .004"
.012" is .33mm which is freaking HUGE def not in the b series range...
.17-.19/.20-.22 or.006-.007/.007-.008 is the stock range as we all know...
yet, I dont know what all effects the lift at the valve. on a b16a I dont
know the rocker arm ratio or the lift at the valve on the spoon cam.
if you have milled a whole mm?.... dude that like .036" thats HUUUGE
that makes no sense?! If .0040 raises the comp like .4 then youve raised
the comp like est. 3cr (no decimal) points? I have heard of .0040" and .0030"
mills but a MM would bump your compression in a HUGE way not to mention raise the chance for eminant valve contact... yet isnt the B16 the one with the shorter
deck height? B16>263 mm (10.354") B18>270 mm (10.630") having the
shorter rod length and less stroke, I can say maybe you are ok... I am just
musing. either way man your tolerances suggest to me that you should be
using the reccomended lash from spoon on your cams. with the consideration
to the mill, I would reccomend running more lash than less. .004 seems
way too tight and seems like that lobe needs less friction, that seems like
it could also cause wear to the LMAs and rockers. thats a mile away from the
stock spec also... be weary of speculation! I would encourage you to really
call around. That seems really extreme then again, what do I know my engine
although modified is mainly stock. .0010" resurface on head, mugen gasket, CTR cams, oversized/flat/ss(bn)exhaust valves, ITR intake valves, stock deckheight,
B18C1.

hope I havent muddied the waters too much...

 

hehehe,not really.But 1mm is actually like .039" to be exact....just being a smart *** .Ive heard on b series motors,every mm is like 1 full point.So with the pct pistons,and a milled head,he should be in the ball park of 12.0:1 compression range.Kinda high for pump gas.Not to mention if the block was decked too!!

 

Yea man the last time I tap danced on a razor blade I lost...

 

helo guyshere in the philippines. we have a 98 octane pump gas available heheh anyway yep my compression is around that range. by the way does valve lash affect the compression ratio of an engine? hmmm help me out guys.. my mechanic woudnt explain everything to me. and yeah your right hes an old school toyota mechanic..guys help me!!! heheheh so what? ill set my valve lash to like .007?!.008?! help!!

 

Spoon suggested specs. 0.20mm-intake, 0.25mm-exhaust

 

helo man... hmmm are u sure of the specs? ill try it out man..tanx anuone else has thoughts about this?! plss ehlp me out dudes...

 

yea man .007, .009 is what he is suggesting.

here is the theory. .004-.007 and .006-.009 is the range on B series
valve lashes. the tighter they are, the longer the lobes are on the rockers
therefore the valves open sooner and close later creating more effective
cam duration. this also wears the cams and rockers on a faster interval
as well. tighter will also make effectively that much more lift at the valve.
this will shift the powerband to low and midrange power and lower your
maximum rpm... making them looser will cause the valves not to seat
all the way letting the flame from burnoff travel up the valve area and
"burn a valve" so you should find a balance. this why I say...

stick with factory spec.

IN.006-.007/EX.007-.008 and BE DONE WITH IT!!!

with all that extra compression... I would feel safer reccomending this
range to you. .009 on the exhaust side I feel could contribute to burning
a valve over a long period of time.

 

so dude your suggesting i do .007intake and .009 exhaust right? tanx dude ill try that out..

 

no man... spec. .007/.008 you have alot of thing in your motor conributing to valve interference and heat... be safe. run stock B-Series lashes

 

tanx man.. so will this setup kill my cam? i mean damage my lobes cause a few months back i was running b16b cams and the mechanic set it at around that lash which u are saying and it damaged my vtec lobes on the intake bigtime man.. and a bit on the exhaust... hmmm.... help!!!

 

you are helpless man...!@ the spec on the VECI label on all B series VTEC cars from the factory are .007/.008