228/232 115+2 LSK lobes

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Mar 26, 2007 | 03:30 PM

MISERICORDIA

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228/232 115+2 LSK lobes

I am thinking of getting this cam to go with a set of PRC LS6 heads with 60cc chambers and .04 Cometics. The plan is have it ground staight up and then use an adjustable timing set to add the advance. The DCR should be right about 8.75 and if that proves to be too much I'll take some of the advance out (or get better gas heheh). I'm hoping it will be easy to tune and have good manners since it is a daily driver and rarely gets above 3000 RPMS.
A few questions:

1. Is there any way of calculating what size pushrods I will need or will I have to buy some sort of length checker?

2. Using PianoProdigy's calc it looks like the EVC will be 1 degree before TDC. Does this mean I won't have to worry about fly cutting?

3. The calc also shows 0 degrees overlap at .05. I want little or no lope. Is this going to lope or do I need to get more LSA ground in?

Mar 26, 2007 | 04:06 PM

Patrick G

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Originally Posted by MISERICORDIA

1. Use 7.400" pushrods with that mill and gasket.

2. DCR will be closer to 8.55:1. Duration at .006" is closer to 278/282 with 227/231 LSK lobes when measured on the Cam Doctor. Use that number as that's what reality will be.

3. 0 degrees of overlap will have lope if you set the idle low enough. A 224/224 112LSA cam also has 0 degrees of overlap at .050". They're known for having some lope. If you want stealth, raise idle speed and increase timing (or select a cam with less overlap). Don't go wider than 115LSA. Your area under the curve is going to get worse if you do.

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Mar 26, 2007 | 05:01 PM

MISERICORDIA

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Thanks for the help.
Will the LSK lobes have a smaller base circle that I need to worry about for the pushrod length? Will I need to worry about fly cutting?

Mar 26, 2007 | 05:07 PM

Patrick G

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Originally Posted by MISERICORDIA

Thanks for the help.
Will the LSK lobes have a smaller base circle that I need to worry about for the pushrod length? Will I need to worry about fly cutting?

The LSK lobes have a much smaller base circle than stock, but your head milling and thinner head gasket will compensate for the difference. You will be OK on piston to valve clearance because your duration is fairly short and your intake centerline is not very advanced.

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Mar 26, 2007 | 07:48 PM

Ragtop 99

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224/228 113 113 would get to 8.71 DCR by my estimate and have zero overlap. Probably have a little more throttle response at 2500 than the bigger duration cam.

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