kllrvet
Expert Class
Posts: 148
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posted January 02, 2012 02:59 PM
.018 Cometic head gasket???
Will the Cometic .018 head gasket go in a 2006 ZX14 without any PTV issues?
thanks in advance
Tony
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ZX14 cam chain tensioner making noise? I have the set it and forget it fix. PM me if I can help.
  
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Compton
Zone Head
Posts: 969
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posted January 02, 2012 03:01 PM
yes, but always double check cam timing.
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b.w.
zx14, little longer, little louder, little lower.
08 Busa, just a little longer and louder and lower than the 14
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joseph702
Zone Head
Posts: 598
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posted January 02, 2012 03:16 PM
what should the clearince be?
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kllrvet
Expert Class
Posts: 148
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posted January 02, 2012 03:22 PM
.080 intake .100 exhaust is the norm
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ZX14 cam chain tensioner making noise? I have the set it and forget it fix. PM me if I can help.
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smokinZX14
Needs a life
Posts: 10197
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posted January 02, 2012 03:29 PM
 Edited By: smokinZX14 on 2 Jan 2012 23:31
quote:
Will the Cometic .018 head gasket go in a 2006 ZX14 without any PTV issues?
thanks in advance
Tony
It will work ..I have done it .. I didn't set cam timing either ... 10 off the head gasket changes cam timing less that a one Deg .. Now if your factory cam timing is way way off from the factory you could have a problem ..
Now i have to ask why you want to do a thin head gasket ? You are looking at MAYBE a 2 to 3 HP gain .. seems like a waste to me .. Use the stock head gasket mill the head 20 thou and you will get 9 to 10 hp ... Do just a little work under the intake seat ( clean up ) and 20 off the head 13 to 14 hp , set cam timing to 105 105 .. Proven power ... been there done that ..
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Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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Shane661
Needs a life
Posts: 11494
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posted January 02, 2012 03:37 PM
Since the head has to come off, I would mill it instead. That way you keep the same PTH clearance, and degree the cams for PTV. Just my .02.
Shane
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kllrvet
Expert Class
Posts: 148
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posted January 02, 2012 04:03 PM
The exhaust cam sprocket bolts backed out of an untouched 8000 mile motor. It is proving to be cheaper to replace the head with a used one, than to repair the existing one. I figured I would just use a thin gasket since it has to be replaced anyway (its also about 40.00 less expensive)
All the work with porting, adjustable sprockets etc I KNOW are great mods, but out of the budget right now,
Thanks
Tony
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ZX14 cam chain tensioner making noise? I have the set it and forget it fix. PM me if I can help.
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joseph702
Zone Head
Posts: 598
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posted January 03, 2012 05:15 PM
will the thin head gasket with the super sport head cut work?
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supra5677
Pro
Posts: 1279
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posted January 05, 2012 08:58 AM
The thin head gasket will give you 0.5 to 0.8 points of compression?
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justoyz2
Zone Head
Justoyz Racing
Posts: 858
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posted January 05, 2012 09:20 AM
milling off .020 only cost about 80.00... bowl work, if done by you cost nothing..... set the lap the valves, cheap and set the lash..... and you are done....
That's a cheap mod for the buck.
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2012 zx14R-blue,2012 zx14R-black, 2014 zx14Trbo, 2011 zx10R, 2007 zx10 Turbo.....
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted January 05, 2012 01:05 PM
I dont recommend the .018" head gasket.
The pistons WILL hit the head.
Be warned!!!
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Y2KZX12R
CompetitionCNC.com
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kaw now
Expert Class
Posts: 446
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posted January 05, 2012 01:42 PM
Do you mean valve will hit head if thin gasket and head is milled .020? Otherwise why would it be offered for sale?
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kllrvet
Expert Class
Posts: 148
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posted January 05, 2012 02:04 PM
quote:
I dont recommend the .018" head gasket.
The pistons WILL hit the head.
Be warned!!!
So you are saying the pistons stick more than .018 out of the hole?
I'll have to measure...damn I just got the gasket today from MTC.
Tony
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ZX14 cam chain tensioner making noise? I have the set it and forget it fix. PM me if I can help.
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted January 05, 2012 02:38 PM
quote:
Do you mean valve will hit head if thin gasket and head is milled .020? Otherwise why would it be offered for sale?
It doesn't matter how much the head is milled. That doesn't effect piston to head clearance.
Just because someone makes something...... Cometic will make a head gasket any thickness I ask them to....
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Y2KZX12R
CompetitionCNC.com
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kllrvet
Expert Class
Posts: 148
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posted January 05, 2012 03:20 PM
y2kzx12r you never answered my question
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ZX14 cam chain tensioner making noise? I have the set it and forget it fix. PM me if I can help.
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joseph702
Zone Head
Posts: 598
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posted January 05, 2012 04:00 PM
he di read it again , basicly just mill the head the stock pistons valve relifes suck, run stock gasket and mill it u get same comp in end but more valve clearince
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kawa74
Expert Class
Posts: 226
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posted January 05, 2012 05:27 PM
quote:
quote:
I dont recommend the .018" head gasket.
The pistons WILL hit the head.
Be warned!!!
So you are saying the pistons stick more than .018 out of the hole?
I'll have to measure...damn I just got the gasket today from MTC.
Tony
It is called the SQUISH area- clearance.
When a engine is running at high RPMS the ROD STRETCHS, the Wrist pin flexs , because of (G forces , the Weight of the Pistons, rings, clips and Wrist Pins )
@ 10,800 a 230 gram piston creates 2,523 G's @ the top of Stroke.
That same 230 gram piston now weighs.....1278 lbs...., times 4 piston= .. 5,112 lbs
@ 10,800 that is 180 REVS per Second 0r Once ever .006 of a Second
You have to leave enough clearance for everything to STRETCH without making Contact with the HEAD, Thus the SQUISH AREA . With everything Stretched in a Perfect world SQUISH would be Zero, but better leave a little room for error ??? Without enough SQUISH @ 10,800 piston will HIT the head 180 Times in 1 second and you have a PILE of scape metal INSTANTLY..
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"I have never met a man so Ignorant that I coun't Learn from him"..."Galileo"
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted January 05, 2012 06:08 PM
Well said kawa!
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Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted January 06, 2012 11:33 AM
Edited By: Y2KZX12R on 6 Jan 2012 19:37
quote:
y2kzx12r you never answered my question
Sorry I thought you understood what i was saying.....
No the piston doesnt stick out of the hole more than .018"
Actually, It doesnt stick out of the hole at all.
Its actually about .008"-.010" in the hole.
The bottom line is, at about .028"-.030" static squish the dynamic squish (piston to head clearance) on a running hot engine at red line, valve overlap, is about zero.
Stock static squish is about .036"-.038" Take .010" off of that and you can see why the pistons will hit the head.
This is all basic engine blueprinting stuff... stuff any engine builder should know and document.
All of our engines are fully blueprinted with pages of details like this.
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Y2KZX12R
CompetitionCNC.com
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Obba
Expert Class
Posts: 455
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posted January 06, 2012 12:12 PM
[quote
@ 10,800 a 230 gram piston creates 2,523 G's @ the top of Stroke.
That same 230 gram piston now weighs.....1278 lbs...., times 4 piston= .. 5,112 lbs
@ 10,800 that is 180 REVS per Second 0r Once ever .006 of a Second....
I always wondered what the figuers were. Thanks for that info.
Pretty amazing and with the flashing of the ECU (shane etc), wanting another 500rpm, just makes one cringe knowing that all those G's and lbs are between your legs...
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted January 06, 2012 12:36 PM
And to think 5,000lbs of pistons are going in the direction of your chest!
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Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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joseph702
Zone Head
Posts: 598
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posted January 06, 2012 05:03 PM
i have the 500 rpm over on a bike that had thin head gasket with head cut before i bought it
i know have a bad cam head damige and so on . y2k is gana be getting it very soon to fix =)
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kawa74
Expert Class
Posts: 226
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posted January 06, 2012 08:58 PM
quote:
[quote
@ 10,800 a 230 gram piston creates 2,523 G's @ the top of Stroke.
That same 230 gram piston now weighs.....1278 lbs...., times 4 piston= .. 5,112 lbs
@ 10,800 that is 180 REVS per Second 0r Once ever .006 of a Second....
I always wondered what the figuers were. Thanks for that info.
Pretty amazing and with the flashing of the ECU (shane etc), wanting another 500rpm, just makes one cringe knowing that all those G's and lbs are between your legs...
Not to worry, just shows how STRONG these motors are. Premium parts , Precision machining, works of art !!!!!!..... INCREDIBLE... thank you KHI
........GEN 1 14.... 61mm....2.4* stroke...230 gram piston
@ 10,800 =..2523 G's..= ...1278.. lbs per x 4 = ...5,112 lbs
@ 11,000 =..2639 G's...= ...1337 ...lbs x 4 =...5,348 lbs
@ 11,300 =...2779 G's....= ..1407 ..lbs x 4 = ...5,626 lbs
.............14-R... 2.559* stroke...230 gram piston
@ 10,800 = ....2711 G's.. = ...1373 ...lbs x 4 ......5,492.. lbs
@ 11,000 = ...2813 G's..= ...1425...lbs x 4........5,700..lbs
@ 11,300 = ...2970.G's... = ...1504 lbs x 4 =........"" 6,019"" ..lb...
..............Y2k-CNC.....1570cc...66mm....2.6* stroke...248 gram piston............
@ 12,500 = ...3695 G's....= ....2017...lbs x 4 = ....."".8,068""...lbs
...............Pro Stock Suz...1755cc... 73mm..=... 2.874*..stroke...324 ..rwhp.........250 Gr piston
@14,000 = ...5120 G's....= ...2820...lbs..x.4....= ............""11,279""...lbs ..........they replace crank around 40 passes, unless they have a failure, ??????
V & H Harley 2600cc...160*...88.9m.= ..3,75*.stroke...361 rwhp...397 crank hp..390 Gr piston
@ 10,500 = ....""3588""lbs....x 2 = ...""7176""lbs
I tired now, good nite
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"I have never met a man so Ignorant that I coun't Learn from him"..."Galileo"
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