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Re: cam advance,blown,stroked [Re: Mr.Yuck] #352832
06/22/09 01:51 PM
06/22/09 01:51 PM
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem Offline
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Dodgem  Offline
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Ontario, Canada
Your math is really bad man
lobe lift x rocker ratio
.424 X 1.5 = .636
.424 X 1.6 = .6784

Last edited by Dodgem; 06/22/09 01:52 PM.
Re: cam advance,blown,stroked [Re: royt440] #352833
06/22/09 04:05 PM
06/22/09 04:05 PM
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick Offline
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patrick  Offline
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Posts: 16,123
Grand Haven, MI
Quote:

CompCams XE268H-10 The following is from the spec card.
I'm using 1.6 rockers: Intake .509, Exhaust .512
Duration @.006 I=268 E=280
Open @.006 I=28*BTDC E=74*BBDC
[Email]Close@.006[/Email] I=60*ABDC E=26*ATDC
These specs are for cam installed @106* Intake Centerline
Duration @.050 I=224 E=230
Lobe Separation 110*

Quote from CompCams instructions "We grind most all of our cams 4* advanced."

So does that mean if I install it straight up (dot to 0* mark on crank gear) that I already have 4*? Do I need any more? The crank gear has settings for 0,2,4,6,&8* advance or retard.

The block is a 440, .060over with the 500ci kit from 440Source.
Stealth heads.
Ross dished pistons. About 8:1 compression.
Dyer's 671 blower, pulleys at 8lbs.

Thanks,
Roy





yes, if you line up the dots, it *should* be 106 ICL


1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
Re: cam advance,blown,stroked [Re: Dodgem] #352834
06/23/09 08:21 AM
06/23/09 08:21 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Quote:

Your math is really bad man
lobe lift x rocker ratio
.424 X 1.5 = .636
.424 X 1.6 = .6784




really you take .424 DIVIDE by 1.5 = 282.66

then you multiply 282.66 x 1.6 = you new lift 452.26
He doesn't have a 636 cam to start with. That's not how it works.


[IMG]http://i66.tinypic.com/pui5j.jpg[/IMG]
Coming soon!!!!
Re: cam advance,blown,stroked [Re: Mr.Yuck] #352835
06/23/09 09:23 AM
06/23/09 09:23 AM
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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RapidRobert Offline
Circle Track
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Posts: 36,041
Lincoln Nebraska
easiest way is to multiply your(1.5) lift figure by 1.067 to get the new 1.6 lift amount. Got a Q, if the cam card says 110 ICL & they automatically grind their cam 4 deg advanced does that mean that when you degree the cam that the ICL will come in @ 106? And ICL is different from the 110 LCA angle on the card?


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Re: cam advance,blown,stroked [Re: RapidRobert] #352836
06/23/09 12:16 PM
06/23/09 12:16 PM
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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goldmember Offline
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Gainesville,FL
ICL=intake centerline. LSA=lobe seperation. 106ICL with a cam ground on a 110LSA is 4 degrees advanced.110ICL would be straight up,114ICL is 4 degrees retarded,ETC. The above confusion is the numbers given are LOBE lift,not gross lift.

Re: cam advance,blown,stroked [Re: goldmember] #352837
06/23/09 03:46 PM
06/23/09 03:46 PM
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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RapidRobert Offline
Circle Track
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Lincoln Nebraska
Quote:

ICL=intake centerline. LSA=lobe seperation. 106ICL with a cam ground on a 110LSA is 4 degrees advanced.110ICL would be straight up,114ICL is 4 degrees retarded,ETC.


Now I understand. Thank you


live every 24 hour block of time like it's your last day on earth
Re: cam advance,blown,stroked [Re: royt440] #352838
06/23/09 05:06 PM
06/23/09 05:06 PM
Joined: May 2008
Posts: 42
Marshall, Texas
royt440 Offline OP
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Posts: 42
Marshall, Texas
Thanks for all the input.

I decided to go Straight up since the cam already had 4* built in. I'll degree it after I get the pistons in.

Also, thanks for the offers on some wilder cams. It will be a while before I fire this one but I'll post results then on how it runs with this 268.

I think it was the BDS website that recommended 110* lobe separation on supercharged engines running on gasoline. I didn't get a CompCams recommendation, just went by the cam descriptions and I don't think they had one specifically for blower's when I bought this a few years ago. Plus, some sites said the blower would make up for not using an aggresive cam and allow for easier tuning and starts.

Everybody keep it safe and thanks again.
Roy

Re: cam advance,blown,stroked [Re: royt440] #352839
06/23/09 06:32 PM
06/23/09 06:32 PM
Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
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blownzoom440 Offline
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ELYRIA,OH
it will be interesting to see your cranking psi.
the first cam i tried was a BDS with 110 and 90* overlap. i had 110 psi with 8.8cr

Re: cam advance,blown,stroked [Re: Mr.Yuck] #352840
06/23/09 09:59 PM
06/23/09 09:59 PM
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick Offline
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patrick  Offline
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Posts: 16,123
Grand Haven, MI
Quote:

Quote:

Your math is really bad man
lobe lift x rocker ratio
.424 X 1.5 = .636
.424 X 1.6 = .6784




really you take .424 DIVIDE by 1.5 = 282.66

then you multiply 282.66 x 1.6 = you new lift 452.26
He doesn't have a 636 cam to start with. That's not how it works.




uh, he said it was .424" LOBE lift


1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
Re: cam advance,blown,stroked [Re: blownzoom440] #352841
06/24/09 12:33 AM
06/24/09 12:33 AM
Joined: Aug 2005
Posts: 4,861
Riverside, Ca
R70RUNNER Offline
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Quote:

it will be interesting to see your cranking psi.
the first cam i tried was a BDS with 110 and 90* overlap. i had 110 psi with 8.8cr




them are the ones....


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Re: cam advance,blown,stroked [Re: patrick] #352842
06/24/09 07:21 AM
06/24/09 07:21 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
Not enough dumb comments...yet

Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Quote:

Quote:

Quote:

Your math is really bad man
lobe lift x rocker ratio
.424 X 1.5 = .636
.424 X 1.6 = .6784




really you take .424 DIVIDE by 1.5 = 282.66

then you multiply 282.66 x 1.6 = you new lift 452.26
He doesn't have a 636 cam to start with. That's not how it works.




uh, he said it was .424" LOBE lift




got ya!

Re: cam advance,blown,stroked [Re: Mr.Yuck] #352843
06/24/09 08:24 PM
06/24/09 08:24 PM
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem Offline
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Posts: 5,746
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uh, he said it was .424" LOBE lift




got ya!



Actually I edited it to Lobe lift when I seen you thought a big roller could be that small of lift.
I just assumed when I said .424 lift with 1.6 was .678 You would have know i was talking lobe lift! LOL!

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