devserver

Hi Guys! Just wanted to ask:

What are the effects if you have the same valve clearance for intake and exhaust? Both are at .008". I read that exhaust should be at around .009 to .011.

I did notice that fuel consumption went higher, but it could have been just the ECU relearning. Power seems the same.

Any thoughts?

I drive a 93 Civic, D16A7.

Thanks!

grumblemarc

iTrader: (4)

Why?

spAdam

iTrader: (1)

Worst case scenario, you burn an exhaust valve due to not seating properly. Not likely at .001" too tight, but there's no good reason I can think of for the average Joe to do that.

Read:

http://performancetrends.com/Definitions/Valve-Lash.htm

civic-steve-94

I run .007 and .007 on my b16 as recommended by my tuner

DCFIVER

Stock valves, seats, and cams?

Pro-SeriesFab

There's such a small gain in setting tighter lash that really the only reason for the lash to be there is for clearance in a solid lifter/arm setup so when the parts heat up there isn't a lack of clearance.

civic-steve-94

Early ITR cams, PEP stainless steel swirl polished valves, supertech titanium retainers, steel spring seats, and turbo valve springs. but I did them same thing with stock b16 valvetrain. its on the loose end of the range for the intake and the tight side of the exhaust but both are in the range.

DCFIVER

Right, tight side on the exhaust. I have diagnosed/repaired a ton of besries engines over the years in which the valves sunk into the head,particularly the exhaust valves. Running the exhaust on the tight side is a recipe for disaster IMO. But if it works for you....

civic-steve-94

I meant the tight side of the range of the factory spec so .007 instead of .008 Loose exhaust valves like to burn. Its been 3 years turbocharged and 1 year before running .007 and .007. I think they were a little tighter then .007 to sink into the head.

I trust Joe at Locash and that's what he runs...