LQ9 with stock 243 heads,biggest off the shelf cam without flycutting??
09-17-2013, 08:26 PM
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LQ9 with stock 243 heads,biggest off the shelf cam without flycutting?? title pretty much sums it up,what cam will perform well in a 3600 stalled auto street/strip car with this setup,and require NO flycutting?..MS3/MS4?..228R?..FMS FM 10/13/14??..I just want a decent sized proven cam that will compliment this combo well(420-440whp)that I wont have to **** with flycutting...suggestions please!.. 
09-17-2013, 08:39 PM
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09-17-2013, 08:43 PM
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Isn't the rotating assembly the same between the LQ9 and LS2 the same, for the purpose of this question? And the 243 are the heads on the LS2, so I would look into LS2 threads to see what people are getting away with.
I need to figure out what cam for my own LS2 soon enough.
I need to figure out what cam for my own LS2 soon enough.
09-17-2013, 08:58 PM
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Isn't the rotating assembly the same between the LQ9 and LS2 the same, for the purpose of this question? And the 243 are the heads on the LS2, so I would look into LS2 threads to see what people are getting away with.
I need to figure out what cam for my own LS2 soon enough.
I need to figure out what cam for my own LS2 soon enough.
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09-19-2013, 06:36 PM
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OK..went and did some measuring (Valve drop@TDC),hopefully this will help with the cam selection...first, I brung #1 piston to TDC,..2nd, I pulled the valve springs off #1 on the cylinder head and measured the height of both valve stems from top of the valve seal to the tip of the valve stem while closed, and I got: INT: 1.133" EXH: 1.119 (CLOSED) ,I then installed the head with the stock head gasket and torqued them to spec and pushed the valve stems down until they rested on the piston and measured the valve stems again(from top of valve seal to tip of valve stem), and I got: INT:.923" EXH:.900" (OPEN),..And lastly I subtracted the little numbers(open) from the big numbers(closed),..and I got: INT: .210" EXH: .219"
First question:did I do this correctly? and second question,what cams would fit without flycutting??..TIA
First question:did I do this correctly? and second question,what cams would fit without flycutting??..TIA
09-19-2013, 08:43 PM
#10
https://ls1tech.com/forums/generatio...ottom-end.html
Both the LS2 and LS9 show the same 9.235-9.245 for deck height. Seems like it should be the same.
09-19-2013, 09:12 PM
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What year is your LQ9? 2005+ are the same pistons and rods in both engines.
https://ls1tech.com/forums/generatio...ottom-end.html
Both the LS2 and LS9 show the same 9.235-9.245 for deck height. Seems like it should be the same.
https://ls1tech.com/forums/generatio...ottom-end.html
Both the LS2 and LS9 show the same 9.235-9.245 for deck height. Seems like it should be the same.
09-20-2013, 03:59 PM
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sweet,thanks for the info,your cam just happens to be around the size im looking for too,ya got a part or grind# by chance??
09-20-2013, 06:42 PM
#14
Check out the stage 2 SNS Torque Max from Tick Performance for the LS2 engine: http://www.tickperformance.com/tick-...r-ls2-engines/
Same cam specs as mine, but on a 111+2. If you have any Q's, PM Martin at Tick Performance. He'll help you out.
09-23-2013, 06:25 PM
#16
There are a lot of motor swappers who's standard MO is to max cam a junkyard motor and go racing, so this would be a well read topic by them.
09-25-2013, 07:27 PM
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09-25-2013, 08:44 PM
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Hmmm. This topic sounds familiar. Martin you should share with them what the biggest LS2 cam would be for a carb setup with the advanced ICL. There are a lot of guys in the carb section that would want that info too since our circumstance is unique.
There are a lot of motor swappers who's standard MO is to max cam a junkyard motor and go racing, so this would be a well read topic by them.
There are a lot of motor swappers who's standard MO is to max cam a junkyard motor and go racing, so this would be a well read topic by them.
The more aggressive a lobe is off the seat, and the more valve lift the lobe has off the seat the less P to V you will have.
You can either use a lobe with less lobe lift at TDC off or on the seat, or use a smaller lobe.
I can pretty much look at where the valve opens or closes in relation to TDC and the lobe used and know if it's going to fit.
When valve diameters, head gaskets and chamber volumes are all altered though, the equation gets much more complex and measuring is always the best bet.
