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Author Topic: will i be ok?  (Read 646 times)

Offline Warren

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will i be ok?
« on: July 03, 2009, 09:08:23 AM »
i'm planning on running a +5 crank after this winter. i planned to take a CP 11:1 piston and have it cut down to 10.5:1 but i'm wondering if, with the +5 crank, i just leave the 11:1 could i still run 93 octane pump gas? i will also be running a KDS racing CNC ported head, +2 valves, RJ cam, and i already have a +3 TB and barker duals. do you guys think i should still have the piston milled down or will it be ok? and i'm just curious is there enough valve releif in a CP 11:1 for +2 valves and a RJ cam?
:( USED TO HAVE:
07 700R raptor SE (black & orange)
DG nerf bars (black, thanks bmust)
custom engine skid, and A-arm gaurds (Thanks bmust)
custom made grab bar & fender mounts (black)
tusk billet gas cap (black)
OMI stem mount
razr2's
Barkers (black)
PCIII
FCI with box
+3 TB

Offline tonto13

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Re: will i be ok?
« Reply #1 on: July 03, 2009, 12:06:02 PM »
I am running a +5 crank w/ KDS 11:1, which is corrected deck height, on pump gas. I am 1200 elev. where I ride. Have had no problems I don't know about the reliefs in the CP. You could alweays put it together and then clay it to make sure, should always check valve clearance anyway.
MSAWS= My Sh*t Always Works Sometimes!
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Offline Warren

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Re: will i be ok?
« Reply #2 on: July 03, 2009, 02:09:29 PM »
is there anybody that i could ask about the valve releifs in this piston? would kenny at KDS racing know for sure?
:( USED TO HAVE:
07 700R raptor SE (black & orange)
DG nerf bars (black, thanks bmust)
custom engine skid, and A-arm gaurds (Thanks bmust)
custom made grab bar & fender mounts (black)
tusk billet gas cap (black)
OMI stem mount
razr2's
Barkers (black)
PCIII
FCI with box
+3 TB

Offline VelociRaptor

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Re: will i be ok?
« Reply #3 on: July 03, 2009, 03:21:14 PM »
If it is a off the shelf CP piston then the exhaust valve reliefs need to be deepened by .030" or better. They get close with cams larger than a HCIII.

Offline Gunz

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Re: will i be ok?
« Reply #4 on: July 03, 2009, 07:49:55 PM »
Basically running the same set up as tonto and I run 87-91.


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Offline Warren

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Re: will i be ok?
« Reply #5 on: July 05, 2009, 04:11:06 PM »
ok so i should get the valve releifs in my piston cut down some but the compression will be ok for pump gas? am i understanding this right? i do alot of trail riding if that makes a difference.
:( USED TO HAVE:
07 700R raptor SE (black & orange)
DG nerf bars (black, thanks bmust)
custom engine skid, and A-arm gaurds (Thanks bmust)
custom made grab bar & fender mounts (black)
tusk billet gas cap (black)
OMI stem mount
razr2's
Barkers (black)
PCIII
FCI with box
+3 TB

Offline Bert

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Re: will i be ok?
« Reply #6 on: July 05, 2009, 11:54:49 PM »
I thought Kenny sold pistons as well.

Offline Warren

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Re: will i be ok?
« Reply #7 on: July 07, 2009, 05:08:53 AM »
well i got ahold of kenny yesterday and he told me that i would be fine running this CP piston without needing the valve releifs cut back into it. now i'm curious if it matters that i'm running a +5 crank i forgot to mention that to him again. so with the +5 crank will i need to worry about getting the valve reliefs cut deeper in a 11:1 CP piston?
:( USED TO HAVE:
07 700R raptor SE (black & orange)
DG nerf bars (black, thanks bmust)
custom engine skid, and A-arm gaurds (Thanks bmust)
custom made grab bar & fender mounts (black)
tusk billet gas cap (black)
OMI stem mount
razr2's
Barkers (black)
PCIII
FCI with box
+3 TB