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Old 10-14-2010, 12:34 AM
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Voodoo cam to much for 1.6 rockers?

Im putting together a budget 355 for my s10, the cam I chose was a Lunati Voodoo 60103 hydraulic flat tappet. Now I already have a set of 1.6 roller rockers that came with the motor that I was wanting to use. I could use the extra lift but Im afraid the ramp speeds might be to much to use 1.6 rockers on. So how much risk am I taking if I use these rockers with this cam, if it matters this is not a DD just a weekend toy.

Cam Specs:
•Advertised Duration (Int/Exh): 268/276
•Duration @ .050 (Int/Exh): 227/233
•Gross Valve Lift (Int/Exh): .489/.504
•LSA/ICL: 110/106
•Valve Lash (Int/Exh): Hyd/Hyd
•RPM Range: 1800-6200

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Old 10-14-2010, 12:47 AM
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It wouldn't be anything I'd worry about if your are running a ZDDP additive or a good ZDDP content oil.
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Old 10-14-2010, 01:06 AM
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If you use this checklist and follow all the precautions, I agree with Eric that you'll be o.k. It sure makes me feel good though, that you guys are starting to question this stuff like this.
http://www.crankshaftcoalition.com/w...ips_and_tricks
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Old 10-14-2010, 01:15 AM
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All right thanks guys for the fast replies and the link, that will come in handy very soon.
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Old 10-14-2010, 06:43 AM
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I'm running a 60103 cam w/1.6 rockers in my 406. Other than moving the powerband up a little (it really likes 2400 rpm), I'd say the 1.6s work just fine. I've got 14in of vacuum at idle. There was a thread about "5600 rpm sputtering" last week and possible valve float w/the recommended springs from lunati. My motor was doing the same thing when first built, after adjusting the rockers it pulls up to 6200 now. Based on the rev limiter effect I'm getting I'd say you need springs with more than 108lbs of seat pressure. Search the 5600 rpm thread and there were some recommended springs in there.
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Old 10-14-2010, 10:05 AM
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ok thanks for the info, Im running beehive springs which I belive has 108lbs seat pressure.
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Old 10-14-2010, 02:32 PM
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Quote:
Originally Posted by Travis24
ok thanks for the info, Im running beehive springs which I belive has 108lbs seat pressure.
Spec the springs carefully- the seat pressure is just one parameter of several that need to be met.

As an example, Comp beehive spring p/n 26981 has 110 lbs "on the seat", but a 350 lbs/inch rating.

The Lunati p/n 73943 springs recommended for your cam are rated at 462 lbs/in. The springs linked to include retainers, the springs are OEM OD so stock diameter retainers will work w/them, as long as all the clearances check out.

I don't know what beehive spring you have that has a 108 seat pressure, and it really doesn't matter as long as they are up to specs (as in fresh, not worn out/old) and the coil bind, seat pressure, open pressure and/or rate/in. matches up to the recommended spring within a close range.
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Old 10-15-2010, 12:07 AM
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well I was wrong on the seat pressure, they are 105lbs. Im running brand new 26915 Beehive springs and retainers along with a set of screw in studs. Comps website says they have a rate of 313lbs. and an open load of 293
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