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TOPIC: Re:Increasing Compression in 08 R* Forum Tools Post New Topic Show latest posts Rules

#325223 HAMBON (User) Fresh Boarder Posts: 5 Increasing Compression in 08 R* 1 Year, 6 Months ago   I joined some time ago, finally got a pic of my 08 Silverado S loaded. I added a K&N BAK, Cobra LS exhaust, a Cobra fi2000 processor (removing this soon--decreased MPG and no noticeable change thanks to the stock computer compensations)and alot of chrome bolt-ons. My question for the forum techies is if and how to increase cylinder compression. I've considered swapping the pistons and porting the heads, along with the valve/spring swap and cams. Anyone had success? Thanks in advance. HAMBON   Logged     The administrator has disabled public write access. #325229 billd (User) Platinum Boarder Posts: 1107 Re:Increasing Compression in 08 R* 1 Year, 6 Months ago   Hambon, Can't help you with you high compression piston question but some of the other "Old Pro's" here can. Why do you want to increase compression? Yamaha Speedstar offers various kits to increase horsepower and torque. Speedstar The Old Pro's will undoubtedly offer alterantive suggestions. Good luck with whatever you choose? BillD PS: Good lookin' scoot!   Logged     The administrator has disabled public write access. #325258 ramathorn45892 (User) Junior Boarder Posts: 103 Re:Increasing Compression in 08 R* 1 Year, 6 Months ago   How much do those speedstar kits run?   Logged       The administrator has disabled public write access. #325348 Curt (Moderator) Never to old to ride! Moderator Posts: 12504 Re:Increasing Compression in 08 R* 1 Year, 5 Months ago   They run total about $1200 - 1500. Why do you want to do all that my 07 clock 130 on the dyno last time I had it run. These bikes are cruisers and never get mine over 90.   Logged     My Site Black Ice is Shiny, Black Ice is Deadly, Ya Wanna Ride My BlackIce?   The administrator has disabled public write access. #325353 kryptoknight (User) Junior Boarder Posts: 143 Re:Increasing Compression in 08 R* 1 Year, 5 Months ago   HAMBON wrote: and alot of chrome bolt-ons.HAMBON And it isn't faster??? THAT IS IMPOSSIBLE!!!!!!   Logged     The administrator has disabled public write access. #325365 old dog (User) Platinum Boarder Posts: 1601 Re:Increasing Compression in 08 R* 1 Year, 5 Months ago   How much are you looking to spend? bill   Logged     110 cu in., PR/JE 10.25:1 HC pistons, PR Cam, PR adjustable push rods, PR stage II ported heads (2mm oversize valves)   The administrator has disabled public write access. #325455 mkayx (User) Platinum Boarder Posts: 1124 Re:Increasing Compression in 08 R* 1 Year, 5 Months ago   i have done the wisco 10.5:1 pistons and porting polishing and decking the heads,along with the bak,pipes,ported intake and dynatek 3000.my star is an 02 1600 and i am getting 106.97 footpounds of torq. now i need a h.o starter since the stock starter has a hard time and the the clutch spring plate since the extra power causes slipping of the weak springs when i get on it. keep this in mind   Logged     The administrator has disabled public write access. #325459 HAMBON (User) Fresh Boarder Posts: 5 Re:Increasing Compression in 08 R* 1 Year, 5 Months ago   Thanks for the input everyone. I was concerned that higher compression would effect cluthch pressure, hadn't thought about the starter needing more juice. As for being faster--yeah, that chrome helps The Speedstar competition upgrades are what I was thinking about, but as someone pointed out; it's a cruiser not a crusher. ALthough alot of my HD enthusiast friends insist they can still out run me. We all know the answer to that one. I'll keep mulling it all o0ver and talking to the Yamaha service techs, as well as anxiously listening to all those who replied to my thread. Thanks again.   Logged     The administrator has disabled public write access. #325464 texasscott1 (User) Two of a kind Platinum Boarder Posts: 1824 Re:Increasing Compression in 08 R* 1 Year, 5 Months ago   You'd be surprised what you can do without increasing the compression ratio. The right cams, intake and exhaust, and head work can work wonders with the stock engine. Also, it's amazing how much horsepower can be added by something as simple as ensuring that the rings are set to the minimum gap. I've got a blueprinting book that shows a test where a Chevy 350 gained 30hp just from changing the ring gap from 0.024" to 0.016". The biggest bang for the buck might be a gapless top ring if they can make one for the Road Star. From what I've read, HC pistons bring their own added problems - heat, harder starting, premium fuel, etc. Scott B.   Logged     My 99 Standard Test Mule Scott B.   The administrator has disabled public write access.

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