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How much is too much compression???

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Old Jan 4, 2011 | 07:43 PM
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Default How much is too much compression???

Im in the process of getting parts for my 99 wg... Im just gonna freshen up the top end but not with a big bore kit,How much compression do I need to shoot for??? Ive been on the Bigboyz site and played around with cams but I dont know which direction I need to go as far as cams go or what pistons to use!! By the way the bike has 42k on it,runs good doesnt smoke...do I need to go for the bottom end too bearings etc... thanks in advance for any input
 
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Old Jan 4, 2011 | 08:24 PM
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10 to 1 is no problem on my 07 SB with S&S 106 kit. No compression releases, starts great.
 
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Old Jan 4, 2011 | 10:16 PM
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thanks,I just dont want to cause probs from being too high
 
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Old Jan 5, 2011 | 12:50 AM
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Once you pick your cam ( or stay with stock ) use the calculator to shoot between 9.2 and 9.5 corrected compression. You should tighten up the squish with a .030 head gasket. The rest is up to you...cheers
 
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Old Jan 5, 2011 | 05:41 AM
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Originally Posted by 99dyna
Im in the process of getting parts for my 99 wg... Im just gonna freshen up the top end but not with a big bore kit,How much compression do I need to shoot for??? Ive been on the Bigboyz site and played around with cams but I dont know which direction I need to go as far as cams go or what pistons to use!! By the way the bike has 42k on it,runs good doesnt smoke...do I need to go for the bottom end too bearings etc... thanks in advance for any input
What cam are you planning on??
Scott
 
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Old Jan 5, 2011 | 09:45 AM
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I was looking at the hq0034 & 0039 and the woods 6 & 7 chain drive cams,but Im open to any recommendations as far as cams and pistons both!!!!! I do want a cam that pulls hard through the rpm range,I ride fairly aggressive alot of it is 2up..and definatly want a cam that sounds really nasty if thats possible with my kind of build
 
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Old Jan 5, 2011 | 10:56 AM
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I have the HQ .575 cam, it sounds "tough" but not radical.

the smaller HQ cams will sound more like stock. the HQ 0033 aka 600 cam would sound nasty.

if you want more power on top, the Wood cams might work better.

Another option to look at is the T-man .590 cam, that cam make great low end an decent numbers up top.
 
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Old Jan 5, 2011 | 10:59 AM
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I would recomend going ahead with a bore up to 95" with that mileage the bore isn't round most likely...
 
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Old Jan 5, 2011 | 03:29 PM
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ok Ive pretty much made my decision about the combo(95 BB kit).... I talked to Bob at wood cams,he quoted me a price of $970 bucks for a conversion kit w/cams,he said this will make it the same as like a 2011,not hydraulic though!!! and I still need to buy pushrods sounds a little pricey to me for a cam change but he said with a 99 bike I need to make the conversion!!! anybody have any input on this or how much a cam change should cost on a 99 bike
 
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Old Jan 5, 2011 | 04:40 PM
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We are Bob Wood's largest account and use his cam almost exclusively here, but being budget-oriented, an Andrews 37 cam set at 9.8-10.0
with a 98"(your clys bored) would get you down the road for sure.
That, with our Stage II heads, was just tuned last week by Doc, and spooled off 106/111, SAE.
Scott
 
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