right cam on baby-blown 350 sbc ??? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-08-2010, 03:32 PM
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right cam on baby-blown 350 sbc ???

Hi guys,

first of all i'm from Germany, and really glad about you
gearheads having much more experience in SBC TUNING
than most of our garages.

My problem: Have a 350 with ported iron heads,
72 chamber, 8,5 comp/r, a 142 Weiand blower
and a 750 Holley DP between.
The cam is a 288/298 ...?!? Nobody knows...
Don't know whether it is really ideal for this package.

What do you think? What performance to expect?

Thanks a lot

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Old 07-08-2010, 04:10 PM
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Triple post.
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Old 07-08-2010, 04:32 PM
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You need to give more detail on the cam you have to give you an opinion onb wether it will work on your blower motor.

generally those motors like a cam with 224 in 234 ex duration (.050")
.465-4.88 lift 112 to 114 lsa.

Cams with tight 106 to 108 lsa should be avoided. (high overlap)

Summit racing cam #1105
or similar cam with similar valve timing works very well for your purpose.

Crane #113801 is another good one.

Comp cams #12-404-4 is another good one.

Isky #201271/281-12 good too.

If you like street friendly solid lifter cams and want a bit more power/rpm
use Lunati #401A3LUN max perf with your blower motor. easy on the street.

What are all the numbers stamped on both ends of your cam?
measure the in and ex cam lobe lift if there are no cam grind/part numbers.
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Old 07-08-2010, 04:47 PM
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I think it is this one:
Crower 60918 288/298 214/224 .444/.467 .489/.514 112
but not sure
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Old 07-08-2010, 04:52 PM
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Quote:
Originally Posted by fast5
I think it is this one:
Crower 60918 288/298 214/224 .444/.467 .489/.514 112
but not sure
If that is the cam you have it will work very well for your purpose.
Its a good one. Its a step milder than the cams I suggested.
But its a Pontiac cam for a Pontiac V8, not a chev.
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Old 02-01-2011, 05:29 AM
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Ok, found out:
Itīs the Crower 00904
288/298 Adv. Duration
444/467 Gross Lift

What do you think?
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Old 02-01-2011, 07:21 AM
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A good match to your engine and blower, IMO. Will be streetable w/a nice wide powerband. The LSA is 112 degrees, too (good for the blower). I wouldn't hesitate to use it.
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Old 02-01-2011, 07:25 AM
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Thanks.

How much horse could be possible?
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Old 02-01-2011, 07:41 AM
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Depends on what the OD ratio of the blower is, and that is largely dependant on the fuel octane or knock resistance. I would imagine 400 plus to be easily accomplished w/good pump gas, though.
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Old 02-01-2011, 08:15 AM
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The OD ratio is standard 1,95 i think. Driving 100 Octane and
30 degree max.
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Old 02-01-2011, 09:34 AM
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The point where you reach detonation with your particular combination of parts and tolerances will be what defines how much SAFE power you will make.

The octane rating number you see listed on the pump differs from what we see in the states. Your fuel octane is very likely calculated using the Research Octane Number (RON) method. In the US and Canada, the octane is calculated by using the "Anti-Knock Index"- derived by averaging the RON and MON (Motor Octane Number).

So, unless you've already factored this in when you say "100 octane", your octane- as we would figure it stateside- would be more like 94-96.

Quench is also important to octane requirement/detonation resistance.

Depending on how much boost the blower makes, your effective CR can be upwards of 12:1 w/as little as 6 psi.



Other factors important to how much boost you can effectively run is the ignition timing curve, ambient air conditions, vehicle dynamics like weight, gearing, how it is used, etc.

So to say the engine will make "X" amount of HP is beyond what I can estimate except in a broad term, w/o having access to simulation software.

Should you want to use a simulation program, the following was posted:

Quote:
Originally Posted by techinspector1
DYNOSIM REQUIRED DATA....
Bore
Stroke
Rod Length
Cylinder head flow, intake and exhaust 0.100" through 0.700" or whatever the mfg gives for range
Intake valve diameter
Exhaust valve diameter
Static compression ratio
CFM, type of induction (2-bbl, 4-bbl, TBI, TPI)
Intake manifold type, mfg (single 4-bbl, two 4-bbl, one 2-bbl, three 2-bbl, individual runner Weber, mechanical fuel injection, low-rise, high-rise, tunnel ram, dual-plane, single-plane, part no. if you have it.
Exhaust system (be specific, primary tube size if long-tube headers)
I have quite a library of CompCams (give me part number, not grind number) in my files, but if you are using another mfg, I'll need type (flat, roller, solid, hyd.), intake valve lift, exhaust valve lift and the following timing info and at what tappet lift the info is valid...(0.006", 0.050") I can calculate from 0.020" if I'm given enough information, but again, that takes my time.
Intake opens ______BTDC
Intake closes ______ABDC
Exhaust opens______BBDC
Exhaust closes______ATDC
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Old 02-01-2011, 09:41 AM
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thank you very much
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