87gtNOS
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posted April 10, 2008 06:20 AM
CAM timing RULES of THUMB
I know there are 'rules of thumb' when it comes to cam timing...like for boost applications, n/a, and for torque vs hp.
Can someone please refreshen me on this topic?
Thanks.
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01 ZX12R
07 ZX14 - YEAH BABY!
03 ZX9R-traded in for the 14!!! June 07!
05 636-traded in for the 9 Sept 05
  
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dubious
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posted April 10, 2008 12:46 PM
 Edited By: dubious on 10 Apr 2008 13:48
Well, on a boosted bike, you don't want as much duration or overlap.
Many will advance the intake, and retard the exhaust cam timing to reduce overlap.
with boosted motors the pressurized intake charge actually assists the exhaust scavenging by pushing the exhaust out, if the overlap or exhaust duration is too long, you will blow some fresh charge right through and out the exhaust...
In addition to wasted fuel and poor mileage, I don't imagine backfires or flashing in the turbo is real good for it either...
This cam timing is also good for making more bottom end power, so additionally it will pick up bottom low boost power, and spool up faster
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87gtNOS
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posted April 10, 2008 12:53 PM
Thx Lyle, so I could also assume under boost situations, even the stock cam timing could use a change too?
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01 ZX12R
07 ZX14 - YEAH BABY!
03 ZX9R-traded in for the 14!!! June 07!
05 636-traded in for the 9 Sept 05
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smokinzx14
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posted April 10, 2008 01:52 PM
Edited By: smokinzx14 on 10 Apr 2008 18:23
Cam timing and lobe center line are two different things ... While you can change the Deg of your stock cams BUT you can not change the lobe center line .. Changing your cam timing will do little if anything ... If you want more power from a turbo you need to have a cam ground to fit the needs of your turbo ....
Lowering your cam timing will lower your power band ...105 105 to 101 101 will help bottom and mid range while killing top end rpms
Rasing your cam timing will kill lower and mid 105 105 to 108 108 will boost high rpm power
To see any power gain you will need to move the cam timing at least 3 Deg to see and difference in power on a dyno ...
Keep in mind that changing the stock cam timing will yeld little or no gain ...Best to keep it at the factory numbers ... If you want more power you will need cams that match your combo...
The only time you should set your cam timing on your stock cams is if you have milled the head or anything else that would have altered the factory set up ..
____________
Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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dubious
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posted April 10, 2008 06:04 PM
good info there Smokin...
unfortunately, nobody seems to make cams specific for the purpose, but I have been told by several tuners to advance the stock intake, and retard the stock exhaust.
I have asked 4-5 very big names out there about cams, and every time told to use stockers.
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Some are not worthy of the effort.
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LAB3
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posted August 12, 2010 02:05 AM
Bump for new member
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zxbob
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posted August 12, 2010 03:36 AM
Stock cams / timing are best for boost. (IMHO)
In the past i've run 106 / 108 on motors with compression & carbs with great results,
and 108 / 110 on my drag bike with nitrous. Movining the powerband around like Lee
said for you type of application.
Bob
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1badzx12r
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posted August 12, 2010 10:25 AM
quote:
Well, on a boosted bike, you don't want as much duration or overlap.
then a connie cam would be perfect ..they have both less duration and lift on both cams ..
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dubious
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posted August 12, 2010 11:04 AM
hey robert, that and the wide ratio trans had me very curious....
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natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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LAB3
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posted August 12, 2010 11:04 AM
105/105.... ?? guess bigger cc engine. My 1986 FJ1200 was 110/112 new . most of the FJ1200 we messed with had the cam's timed this way from factory.......... my 1983 CB1100F was 107 when we checked, it had like 5,000 miles on back then. Don't remember what Honda said it should be from factory.too long ago and too many newer bikes....still have the FJ1200 :-)
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1badzx12r
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posted August 12, 2010 01:56 PM
quote:
hey robert, that and the wide ratio trans had me very curious....
as soon as i come up with a crankshaft .i'm building a motor using the connie trans ,pistons,and cams.
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dubious
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posted August 13, 2010 04:24 AM
is the crank same as a zx14? Can we use a zx14 clutch basket?
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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1badzx12r
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posted August 13, 2010 04:26 AM
Edited By: 1badzx12r on 13 Aug 2010 12:28
quote:
is the crank same as a zx14? Can we use a zx14 clutch basket?
YES AS LONG AS ITS AN 08 AND ABOVE BASKET
I'M building with an 06 basket so i need an 06 crank
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dubious
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posted August 13, 2010 04:34 AM
I have 06 ape lightened zx14 crank sitting on my shelf...
I would consider selling, but not giving it away....
____________
natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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1badzx12r
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posted August 13, 2010 04:38 AM
pm me a price
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zxbob
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posted August 13, 2010 12:08 PM
quote:
pm me a price
No . . . . . . post up a price !
Bob 
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Good parts aint cheap and cheap parts aint good !
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1badzx12r
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posted August 13, 2010 12:12 PM
Edited By: 1badzx12r on 13 Aug 2010 20:13
you 1 my favorite peoples do you have a stocker bob
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zxbob
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posted August 13, 2010 12:20 PM
I wish I did . . . . I'd send it to ya !
When I sold the bike ~ I sold all my parts too . . . sorry
Bob
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Good parts aint cheap and cheap parts aint good !
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1badzx12r
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posted August 13, 2010 02:21 PM
i found 1
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