supra5677
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posted April 29, 2007 06:50 AM
Y2K
can I remove the steel block shim (base gasket) and still run a thin head gasket (.018) and still clear a .383 lift cam?
thanks,
supra
where should I agree the intake 108/108?
   
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Y2KZX12R
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posted April 29, 2007 04:22 PM
 Edited By: Y2KZX12R on 29 Apr 2007 17:25
You need to check that combo. Every engine is different. Ask Karl about that. Rods are not exact.
Check it at the cam timing settings you want to run and then you can see if you have the clearance needed to remove the block "shim".
108 on the intake will give you some extra room. Are you running cast pistons? you can run a little tighter p to v with stock cast pistons. But again check it out on all 4 cylinders. Not just one.
Check it at 8-9 degrees ATDC. With a stock intake cam installed and a lobe center line of 104 thats the closest the piston will come to the intake valve.
Here put this in your data bank  It shows the lobe profile to piston for a stock camed zx12r.
Your cam is different so you can make your own profile map. but it should be within a few degrees of 108.
deg atdc - clearance
0 - .098"
3 - .088"
5 - .085"
6 - .083"
7 - .082"
8 - .081"
9 - .081"
10 - .085"
12 - .088"
The actual clearance numbers are with JE pistons (deeper valve reliefs than stock) in the Muzzys 1375 kit and are not to be used for anything other than to show the relationship of the clearance to degrees.
Engines will vary and you must check it.
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entropy
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posted April 29, 2007 06:06 PM
Edited By: entropy on 29 Apr 2007 19:11
supra
have you checked yr quench with the proposed set up??? (on all 4 cyl???)
as Jim was saying mine came out 36, 36, 34, 37 on my current build, #3 apparently has a "long rod", because that crank hasn't shown #3 rod journal to be consistently "tall" previously.
After i got the quench as close to 30-32 as I could, i set valve lash, then set the CL's to 107/110 (Muzzy cams), then checked VTP
atdc intake
TDC-70
2.5 - 65
5.0 - 58
7.5 - 54
8.0 - 53
10.0 - 52
12.5 - 55
15.0 - 64
Just some food for thought.
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supra5677
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posted April 30, 2007 10:00 AM
0 degees above top dead center equals .098 piston to valve clearance? at what lobe center.. this is confusing me?
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Y2KZX12R
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posted May 01, 2007 02:34 AM
the intake valve comes closest to the piston at about 8 degrees ATDC. Thats with the intake cam lobe centerline in the stock location at 104.
So if you dont use clay and you check p to v clearance by opening the intake valve manually, do it at 8 deg ATDC.
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buck20
Parking Attendant
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posted May 01, 2007 04:13 AM
I just got an 02 zx12r and it has a great deal of vibration at around 4500 rpm is this normal for these bikes or does this one have problems.
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supra5677
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posted May 01, 2007 09:19 AM
the bike is buzzy at 4500rpms not as bad as a busa..
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supra5677
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posted May 01, 2007 09:19 AM
are there any clearance issues on the exhaust side I need to worry about?
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Y2KZX12R
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posted May 01, 2007 10:38 AM
quote:
are there any clearance issues on the exhaust side I need to worry about?
Stock pistons, stock exhaust cam? No.
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Y2KZX12R
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supra5677
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posted May 01, 2007 11:45 AM
ok. so I only need to worry about the intake clearance.. why is that?
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Y2KZX12R
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posted May 02, 2007 04:08 AM
The exhaust has quite a bit more clearance. Not usually an issue with stock cams.
Check both if you like. Its not a bad idea.
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Y2KZX12R
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entropy
Moderator
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posted May 02, 2007 04:18 AM
Edited By: entropy on 2 May 2007 05:21
quote:
The exhaust has quite a bit more clearance. Not usually an issue with stock cams.
Check both if you like. Its not a bad idea.
as an example, just did this last Sat:
#1 Exhaust valve
BTDC_15_.100
______12.5_.090
______10_.087 min exh VTP; #1 quench = .036, cams = 107/110 (Muzzy/Muzzy)
______08_.088
______05_.090
TDC__00_.106
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