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Old 10-24-2004, 07:43   #1 (permalink)
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my spec input/advice needed

aussie 351
closed chamber 2vs
+30 flat tops
x elorator intake
holley (not sure but have new 600) and 425 impco
true roller set with 3 keyways
paw ssi cam basic spec = duration ad 308 331+514 514 lift 108 lobe centers
matching springs
anti pump lifters
ford motortsport 1.73 roller rockers
tri y headers
c4 auto not sure on t/c spec
now what should i expect from this set up?
wich keyway should i use on timing for cam? for best results as this lot is not bolted back together yet
also wich would be ideal rear end ratio its in a xy ute for fun only
all help gratefull
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Old 10-25-2004, 05:18   #2 (permalink)
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Re: my spec input/advice needed

Quote:
Originally Posted by carpunk
aussie 351
closed chamber 2vs
+30 flat tops
x elorator intake
holley (not sure but have new 600) and 425 impco
true roller set with 3 keyways
paw ssi cam basic spec = duration ad 308 331+514 514 lift 108 lobe centers
matching springs
anti pump lifters
ford motortsport 1.73 roller rockers
tri y headers
c4 auto not sure on t/c spec
Install the cam to zero. Use a degree wheel and check properly after that. If it is out, you adjust to what key you NEED by advancing or retarding. Make sure you get this correct, as it will make or break a good motor.
For a fun car, i would go around 3.7 or 3.9:1, but my fun car also runs a fair bit more cam/carb, so who knows, maybe you should go more conservative like 3.5??
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Old 10-25-2004, 10:25   #3 (permalink)
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Re: my spec input/advice needed

thanks for reply what i dont really understand is y i have 3 keyways on bottome sprocket i know what they do but can u tell me the goods and bads about using each setting? i dont really want to pull the cover off again once set. i was also concerned imight not ave enough lift with this cam? butcan anyone give me an idea what to expect in hp and torque?
cheers
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Old 10-26-2004, 01:59   #4 (permalink)
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Re: my spec input/advice needed

HP guess. 280 at flywheel, but i really have no idea.(cam still looks weird, low lift with huge advertised duration??)

Put the crank sprocket on the crank at the standard zero position, and then line that up with the dot on the cam sprocket. Then use a degree wheel to check if the cam is opening and closing at the exact correct times. (not 2 or 4 degrees out). If it is out, this is when you start using the crank sprocket in the different positions, so you do get the cam opening and closing at the "correct" time. If you dont know how, save a lot of time and mistakes and get someone who knows how to, and watch and learn. It is quite easy to do, but very hard to be explained correctly how to do it. Also, errors can make you change from the correct position to a totally incorrect position stuffing everthing. If all else fails, leave it at zero and 90% of the time it will be pretty close.
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Old 10-26-2004, 02:32   #5 (permalink)
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confused Re: my spec input/advice needed

yea i think its awierd cam also
maybe they have given wrong numbers? if its any help heres what the cam card says
lift intake @ cam .297............@valve .514

ex @ cam .297.....................@ valve .514 rocker ratio 1.73
cam timing sae
@ .006 in open 50 btdc closes 78 abdc sae dur 308
valve lift ex 78 bbdc closes 56 atdc sae dur 314
cam timing .050 tappet lift
@ .050 intake open 8 btdc closes 36 abdc .50dur 224 lobe centers 104 atdc
ex 47 bbdc opens closes 5 atdc .50 dur 232 lobes centers 112 btdc
it came from paw in usa and is a ssi ( super stock industries) performance cam in between range 3 and 4 (4 beeing mainly race only) i think they said its more to do with the lobe centers? as most common cams are 110 and in the book this 1 is 108 allthough the card says the above??........i am confused as a baby racoon!
any of this make more sense now m8?
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Old 10-26-2004, 06:49   #6 (permalink)
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Re: my spec input/advice needed

The reason I've reccomended a cam of that style is for LPG. Have a look at the specs i've posted up for my cam and you'll see i've just bought one with very similar specs (albiet a solid not hydraulic).

The low lift is to get as much bottom end out of it as possible, the overlap is to try and draw as much LPG into the intake as possible at high RPM... which impco 425's are notorious for running lean.

My cam has a small amount more lift and duration than yours, it heads to the dyno on Thursdayand I'll be posting the results up on Thursday night. Fingers crossed!
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Old 10-26-2004, 12:11   #7 (permalink)
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Re: my spec input/advice needed

hi xd thanks for the input bro
welli tried to get a cam as close to 1 i was recomended but never realised this 1 was close to your recomendatyions or similar to the 1 u just got so thats a bonus! and paw came up with this its also real cheap 49 usd!!
i just spoke with them and they say its good for 2 -6k rpm rough idle
and a good street/strip cam
needs a 2400 -2800 tc (not sure what i have could b anything)
also paw said the lift is not near as important as duration . what i dont understand tho is y 2 cams can have the same @50 duration but totally different ad duration???? is it the lobe centers that make the difference?
very much looking fwd to seeing your specs and results m8
im still on the lookout for a decent used intake
+ in the middle of trying to get some headers shipped over off another member
and thanks again for the input
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Old 10-26-2004, 19:02   #8 (permalink)
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Re: my spec input/advice needed

Quote:
Originally Posted by carpunk
what i dont understand tho is y 2 cams can have the same @50 duration but totally different ad duration???? is it the lobe centers that make the difference?
The reason is different manufactures use different lift values when calculating their adv. duration. I've even seen the same manufacturer use different values between different cams!

This is exactly why .050 was introduced as a standard, it allows you to accuratly compare different manufacturers cams.
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Old 10-26-2004, 20:21   #9 (permalink)
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Re: my spec input/advice needed

Sounds like Gregs got it all under control. It all looks good. Damn gas cams look weird.

Brenden
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Old 10-27-2004, 03:26   #10 (permalink)
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Re: my spec input/advice needed

Dont get worked up on the the 50 thou verses the advertised duration. I dont run custom ground camshafts because i know nothing solid about designing them. I only run what's proven to be successful, which may limit me. My Crane solid had a big 50 thou figure(246 deg), but small advertised duration(282 deg) Are you running a 600 vac or lpg??. I spose you will have to choose before you start. I have been assuming you will be going the 600 vac you were mentioning on your other post. If it's going to be lpg, it's another ball game that i know very little about. Just hurray up and get it flying...
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