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Author Topic: what compression is .020 shaved off the head on a stock bike  (Read 14006 times)

Offline fastone

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what compression is .020 shaved off the head on a stock bike
« on: November 12, 2006, 12:34:20 PM »
I want to insall some 385 cams andsome head cleanup and mild port work. How much compression will shaving the head .020 yeild trying to get torque numbers up and make around 190hp with some tuning
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Offline DarkFalcon

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #1 on: November 12, 2006, 04:59:23 PM »
That is too much material to remove but it would bump the compresion up 1.2 to 1.4 points.
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Offline fastone

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #2 on: November 12, 2006, 05:15:25 PM »
Quote from: DarkFalcon on November 12, 2006, 04:59:23 PM
That is too much material to remove but it would bump the compresion up 1.2 to 1.4 points.
What problem would it yeild if I shave that much off the head. PTV clearance or cam chain tension problems. The stock compression is around 11.1 so that would make the compression around 12.2 to 12.4. Would this run pump gas. Talk to me before I have this done is my quest for more power. If I just remove the base plate how much gain or take .010 off the head
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Offline DarkFalcon

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #3 on: November 12, 2006, 05:55:14 PM »
Depending upon your stock clearances, removing the base or milling .010 from the head should increase your compression ratio .6 to .7 points. The problem with removing .020 from the head is the potential for shrouding the intake valves...... flow interference with the cylinder walls as they would now be closer. I would remove the base gasket and take .008 from the head....so you would be very close to 12:1 or slightly higher.
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Offline fastone

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #4 on: November 13, 2006, 09:22:46 AM »
Thanks Dark Falcon that is what I wanted to know. I need somme good direction bro. a baseline to start with.
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Offline mountainmotor

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #5 on: November 13, 2006, 09:32:05 AM »
Quote from: fastone on November 13, 2006, 09:22:46 AM
I need somme good direction bro. a baseline to start with.

Starters is that the factory stock Busa engines don't have base gaskets . Film of sealant yes , .020 Suzuki base gasket , no .
This is in reference to above when you asked

If I just remove the base plate how much gain or take .010 off the head

And nothing to do with DF's post on BG in which was probably an oversight since he answers so many 1397 questions
« Last Edit: November 13, 2006, 09:44:41 AM by mountainmotor »
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Offline gnd111

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #6 on: November 13, 2006, 11:52:28 AM »
Suzuki does use a base gasket - better check your microfiche again...


Parts found with Part Number: 11241-24F00
Description GASKET,CYLINDER
Price $21.02
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Offline mountainmotor

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #7 on: November 13, 2006, 12:40:00 PM »
Quote from: gnd111 on November 13, 2006, 11:52:28 AM
Suzuki does use a base gasket - better check your microfiche again...


Parts found with Part Number: 11241-24F00
Description GASKET,CYLINDER
Price $21.02



 :lol:
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Offline fastone

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #8 on: November 13, 2006, 12:48:27 PM »
I asked for answers to try to acheive between 190 to 200 rwhp without going 1397. I wasn't trying insult anyones knowledge or start an argument on who has themost knowledge or is the better mechanic. I need to know simple knowlwdge that I dont know so I appreciate whatever advice I'm given to advoid being screwed on motor work. Thanks guys. Thinking of just leaving the base alone and having my builder shave the head to acheive as close to 12.1 as possible. .010 I was told will give me 11.7.1 so I figure if I take .015 of the head this will leave enough for valve to have shrouding and it should get me close to my compression ratio of 12.1. The builder will cc the head and calculate thecompression by the stock bke measurement. With a maximum being removed of .015. I will be adding mea cycle 385 cams. With some minot exhaust port and bowl blending on the head cleanup and try to improve the exhaust ports a little. Now for thenext question I weight 275 suited and need to know what setting working best to degree the cams a for a big guy. need all the torque I can get from this combination. I'm also concerned with average tq and hp more than peak. avg wins races not peak.
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Offline mountainmotor

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #9 on: November 13, 2006, 01:09:47 PM »
Quote from: fastone on November 13, 2006, 12:48:27 PM
I asked for answers to try to acheive between 190 to 200 rwhp without going 1397. I wasn't trying insult anyones knowledge or start an argument on who has themost knowledge or is the better mechanic. I need to know simple knowlwdge that I dont know so I appreciate whatever advice I'm given to advoid being screwed on motor work. Thanks guys. Thinking of just leaving the base alone and having my builder shave the head to acheive as close to 12.1 as possible. .010 I was told will give me 11.7.1 so I figure if I take .015 of the head this will leave enough for valve to have shrouding and it should get me close to my compression ratio of 12.1. The builder will cc the head and calculate thecompression by the stock bke measurement. With a maximum being removed of .015. I will be adding mea cycle 385 cams. With some minot exhaust port and bowl blending on the head cleanup and try to improve the exhaust ports a little. Now for thenext question I weight 275 suited and need to know what setting working best to degree the cams a for a big guy. need all the torque I can get from this combination. I'm also concerned with average tq and hp more than peak. avg wins races not peak.

You will make 175-180 horsepower with std bore and low compression. Torque will suffer no matter where you set the cams .

The numbers just won't be where you want them with this cam combo thats better suited for stout 1397's and ..... you do not have a factory base gasket . Serious !

Is this your combo or something some guy thats going to do the work for you dreamed up ? 
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Offline Yngve

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #10 on: November 13, 2006, 01:17:35 PM »
All the stock Suzuki Hayabusa engines I have taken apart have had one base gasket.   I used 5 of them on my stroker back in 00 b4 there was a suitable spacer to buy.
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Offline mountainmotor

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #11 on: November 13, 2006, 01:24:35 PM »
Must be a non North America thing because I have had 5 apart last 2 years " 2 w/zero miles - 1 w/275 miles "  and no base gasket on any of them .

I always thought they made it available only to correct the compression when milling and reworking  stock engine rebuilds 


 fastone ,

you have a explanatory PM that will help you .
« Last Edit: November 13, 2006, 01:27:34 PM by mountainmotor »
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Offline gnd111

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #12 on: November 13, 2006, 01:42:27 PM »
www.ronayers.com - has microfiche for all year Busa's and all show base gaskets.

GeorgeC's busa and mine each had base gaskets.  We bought both of ours in Florida...


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Offline mountainmotor

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #13 on: November 13, 2006, 01:53:26 PM »
Interesting . George's bike is an 05 model , correct ?

It's 5-3 now  :D
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Offline PerformancePorting

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #14 on: November 13, 2006, 02:02:18 PM »
If you take that much material off the head you will get into the valve seats. The most material you can remove without hitting them is .011. Take .009 off the head and remove the base gasket use two stock intake cams. Have the head ported bore TB's good for 185-195.  Every Hayabusa I have seen has a base gasket.
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Offline fastone

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #15 on: November 13, 2006, 02:51:17 PM »
base gaskets are on 1999- 2002 busa all have them. 2003-2006 depends on them block and and pistons used all parts numbers are the same but some have them and some don't in these years. some just have a sealant.
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Offline mountainmotor

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #16 on: November 13, 2006, 03:04:50 PM »
fastone ,

Did you get that dyno sheet I sent you ?
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Offline mike46

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #17 on: November 13, 2006, 04:11:05 PM »
Quote from: PerformancePorting on November 13, 2006, 02:02:18 PM
If you take that much material off the head you will get into the valve seats. The most material you can remove without hitting them is .011. Take .009 off the head and remove the base gasket use two stock intake cams. Have the head ported bore TB's good for 185-195.  Every Hayabusa I have seen has a base gasket.
Getting the squish tighter is good via removing the base gasket. How about a thin head gasket instead of milling. Add Yosh cams or 2 intakes with a good ported head and you will get what you want. I'm at 186 with 105lbs( .007 off the head, my ported head, stock pistons/head & base gasket and Yosh cams)
« Last Edit: November 13, 2006, 04:12:50 PM by mike46 »
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Offline gazza414

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #18 on: November 13, 2006, 05:03:45 PM »
and an aftermarket exhaust Mike or stock system?

I've only seen all base gaskets on Busa's
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Offline mike46

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #19 on: November 13, 2006, 05:52:39 PM »
Quote from: gazza414 on November 13, 2006, 05:03:45 PM
and an aftermarket exhaust Mike or stock system?

I've only seen all base gaskets on Busa's
TiForce..non Sumo. Small box mod, BMC, all short, ....pretty standard stuff-nothing fancy.
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Offline gnd111

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #20 on: November 13, 2006, 06:32:21 PM »
Quote from: mountainmotor on November 13, 2006, 01:53:26 PM
Interesting . George's bike is an 05 model , correct ?

It's 5-3 now  :D

Yep - Mine is an 02 and GeorgeC's is an 05.

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Offline Pinky

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #21 on: November 13, 2006, 06:36:16 PM »
Quote from: mountainmotor on November 13, 2006, 01:24:35 PM
Must be a non North America thing because I have had 5 apart last 2 years " 2 w/zero miles - 1 w/275 miles "  and no base gasket on any of them .

I always thought they made it available only to correct the compression when milling and reworking  stock engine rebuilds 


 fastone ,

you have a explanatory PM that will help you .
my 04 has one and had it when i took it apart
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Offline Shamrock

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #22 on: November 13, 2006, 10:23:14 PM »
my 01-00 both did also 2 04's and a 05  welol lets see all the busa iv done have unless someone already  pulled it
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Offline fastone

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #23 on: November 14, 2006, 08:58:13 AM »
Quote from: 469 Boy*Robert Kelly on November 13, 2006, 10:23:14 PM
my 01-00 both did also 2 04's and a 05  welol lets see all the busa iv done have unless someone already  pulled it
Good point some motors never see any miles before being modified
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Offline GeorgeC

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Re: what compression is .020 shaved off the head on a stock bike
« Reply #24 on: November 14, 2006, 03:40:16 PM »
FWIW, the '00 motor I have apart right now had a base gasket...  Pretty sure it had never had the cylinder off before.
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