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DuCKy!

EJ20Y Valve Clearances

10 posts in this topic

Hi guys, just doing my valve clearances on my BP5 Legacy GT (facelift).

I've read that the valve clearances are:

Intake - 0.20mm / 0.008"

Exhaust - 0.25mm / 0.010"

 

However, what are the tolerances?

At the moment I've got 4 of my intake ones at 0.007", the other 4 are at 0.008".

5 of my exhaust are at 0.011", the other 3 are way out (0.014" and 0.013").

This is after a rebuild btw, and that's the best I can do with my existing stock shimless buckets. Just wanted to see how many I need to order.

 

Cheers all.

Also, does anyone have buckets I can buy? Otherwise I gotta order from Partsouq?

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As a rough guide the USDM 04 sti manual says intake is  0.0079 +0.0016 / 0.0024... so your intake clearances are well within that.

The exhaust clearance is much bigger than 0.010 on this engine though... 0.0138±0.002, the +/- 0.002 is probably pretty good,

so 0.13 and 0.14 is probably on the big side. I have quite a few spare buckets, let me know what you need.

 

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Hi Loren

I've always thought that the exhaust is 0.010"?

Are these engines different to the usual then, at 0.014"? Gee this is super confusing!

 

If that's correct, then 5 of my 0.011" are out, whereas the 0.014" and 0.013" is fine since the range is 0.0118" and 0.0158"? (0.0138±0.002)

Yes I will need some spares thanks, will need to figure out which ones need adjustment..

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I don't know what a BP5 Legacy GT should be...  I know that GC8 STi had 0.008 and .010 and that is what mine is set to.

The USDM 04 STi has the 0.0138 clearance... I have never found any JDM manuals... only USDM. In general though,

.008 and .010 is very common across lots of motors. 0.010±0.002 is 0.008 to 0.012... so 0.013 is too big. You could

look for a specific manual for you car of course and maybe the larger clearance is fine.

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I see, I don't even know where to search for the manual...

So many variants and being JDM it's pretty rare?

 

I'm gonna keep my intakes as they are, and will keep my 0.011" exhausts the same.

That leaves the 2 x 0.013 and 0.014 as you've mentioned.

 

Looks like I'll need 2 x 5.00mm, and 1 x 5.03mm bucket.

Measured with micrometer!

 

Do you have any that'll suit?

 

Cheers

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I don't know why it's hard to find jap spec manuals... maybe they are all in Japanese and google only looks for english manuals by default?

 

I will look through my buckets and see if I have any to suit.

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Yes please can you check ASAP, otherwise I'll order some from partsouq?

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Sorry for the delay. The closest I have is a 499, a 501 and a 502.

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Hiya, thanks for the reply.

Are these measured at 499, 501 and 502?

 

I can make do with all 3 of those as I've found a couple more out of spec, and those will push some of mine closer towards 0.010" clearance.

Will still have to purchase a couple from partsouq.

 

Let me know? 

Do you have a contact number?

 

Cheers

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I haven't measured them and I don't have a micrometer.

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