Comp Cams 30-30 camshaft - Team Camaro Tech
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post #1 of 18 (permalink) Old Jul 5th, 09, 02:15 PM Thread Starter
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Todd
 
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Comp Cams 30-30 camshaft

I found my oil leak and the 302 is going back together. I am baffled
though following degreeing the new camshaft I decided to install.

Readings are as follows head on, head gasket installed, snugged down, "O" stamped rockers @ .026".
Cam installed straight-up cloyes double roller chain
ICL: 79 deg @ .05 + 153 deg @ .05 = 232 deg/2 =115.5 ICL
Cam card lists ICL at 110 deg. I think the cam is ground wrong?
LSA: 115 [email protected] .05 + 113 [email protected] .05= 228 deg/2=114 LSA
Looks good
Timing events:Exh starts open 39 BTDC, Exh closed @ 93 deg BBDC
Intake opens 95 deg ABDC, Intake closed 34 deg ATDC

Pic of cam card


Todd

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post #2 of 18 (permalink) Old Jul 5th, 09, 05:09 PM
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Alan
 
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Re: Comp Cams 30-30 camshaft

Is the cam ground wrong or is it a typo on the card?

Are the specs on the card identical to the 30-30 cam?

I know you are careful with your engine assembly.

alan
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post #3 of 18 (permalink) Old Jul 5th, 09, 05:12 PM
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Tim
 
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Re: Comp Cams 30-30 camshaft

I have run into Summit cam cards that were bogus, but your deal seems you just need to advance the cam some. Finding a gear set 5 or 6° out isn't unusual at all.

On checking events, how are you doing that..... because if you are doing it on the lobe vs on the valve retainer you have the rocker ratio you need to take into consideration. And you need to know how it is specced,,,,, at what lift and where. That should all be available at Comps site. I haven't degreed one today so I won't act like I remember.

You know Comp has their own flavor of breakin oil for flat tappets now, eh?

http://www.compcams.com/information/...ryID=592413442

Tim Smith

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post #4 of 18 (permalink) Old Jul 5th, 09, 05:32 PM
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Bill
 
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Re: Comp Cams 30-30 camshaft

Todd,
Looking at the cam card it looks like the opening and closing specs are at .016" lobe lift. You really need to be checking the cam on a lifter, not out at the cylinder head. Try it again and see what you get. I have never degreed a cam by measuring anywhere but on the camshaft itself with a lifter or cam degreeing tool that goes in the lifter bore.

Bill Koustenis
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1971 Chevelle "Heavy Chevy" original owner


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post #5 of 18 (permalink) Old Jul 5th, 09, 05:38 PM
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Re: Comp Cams 30-30 camshaft

Todd,
The other thing is, try measuring the centerline going .050 either side of max lift on the intake lobe. It could possibly be an assymetrical grind in which case your method will not work.

Bill Koustenis
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post #6 of 18 (permalink) Old Jul 5th, 09, 09:29 PM Thread Starter
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Todd
 
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Re: Comp Cams 30-30 camshaft

Quick check head off, lifters in:
ICL; 161 [email protected] + 63 [email protected] .05 = 224/2
112 deg ICL
So the magical question cam straight up?
or advance keyway which provides 3 or 4 deg?
Checked intake timing events at .016 63 deg BBDC and 103 ABDC

Todd

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post #7 of 18 (permalink) Old Jul 6th, 09, 10:27 AM
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Bill
 
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Re: Comp Cams 30-30 camshaft

Todd,
I dont think you can check the intake centerline accurately doing it from the .050" lift points. Try doing it at max lift on the lobe + and - .050" and see what you get.

Bill Koustenis
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post #8 of 18 (permalink) Old Jul 6th, 09, 06:53 PM Thread Starter
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Re: Comp Cams 30-30 camshaft

Bill
Lifter out and dial indicator probe straight to lobe then right?
Todd

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post #9 of 18 (permalink) Old Jul 6th, 09, 07:16 PM
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Bill
 
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Re: Comp Cams 30-30 camshaft

Todd,
No, you can still use the lifter but ..... :
1. Put your dial indicator on the lifter.
2. Turn the engine until you are at max lift on the lifter, "zero" your dial indicator.
3.Back up about .070"
4. Start turning forward again and record the number on the degree wheel when you are .050" before max lift
5. Keep turning until you get to max lift then keep going until the lifter drops .050" then record that number.
6. Add the two numbers together and divide by 2. You should get 110 if the centerline is correct.

Make sure to keep a little pressure on the lifter to make sure it is following the cam.
Try it and see what you get

Bill Koustenis
Owner
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


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post #10 of 18 (permalink) Old Jul 6th, 09, 07:24 PM
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Bill
 
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Re: Comp Cams 30-30 camshaft

Todd,
You should have numbers close to 95 & 125

95+125= 220 divided by 2 = 110

Bill Koustenis
Owner
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


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post #11 of 18 (permalink) Old Jul 7th, 09, 06:17 PM
 
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Re: Comp Cams 30-30 camshaft

Bill,

Please come right out and tell us what the CC wannabe 30-30 cam really spec's at b/c I'm reading from you that's NOT a 30-30 cam at all.

How far off am I b/c the 30-30 is like 346 per GM/314 per WBR/ and 304 per the late Pat Kelly/254, 114/112, .455" net lift w/ .030" hot lash.

And this is why the old Isky Z-30 cam does better, imho, b/c it is 290/250, 108/108, .450" net lift w/ .030" hot lash. BUT I gotta admit that it is a "knarly" SOB w/ 11 to 1 CR. in a hopped up 327.

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post #12 of 18 (permalink) Old Jul 7th, 09, 07:32 PM Thread Starter
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Todd
 
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Re: Comp Cams 30-30 camshaft

Bill;
Rechecked the numbers and the following observations apply.
Full Intake lobe lift at lifter, dial indicator set to 0.00"
ICL: @ .005" 128 deg + @ .005" 97 deg = 225/2 = 112.5 degrees
Recheck ICL at .050, 162 deg + .050, 63 deg = 225/2 = 112.5 degrees
See TDC recheck pic
See ICL pic

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post #13 of 18 (permalink) Old Jul 8th, 09, 07:40 PM
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Bill
 
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Re: Comp Cams 30-30 camshaft

Todd,

Looks like it is off 2 1/2 deg. Might be the cam, might be the timing chain set, might be the keyway in the crank. I would put a 3 degree bushing in it and call it a day.

Bill Koustenis
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1971 Chevelle "Heavy Chevy" original owner


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post #14 of 18 (permalink) Old Jul 8th, 09, 08:16 PM
 
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Re: Comp Cams 30-30 camshaft

Never mind.

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post #15 of 18 (permalink) Old Jul 8th, 09, 08:51 PM Thread Starter
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Todd
 
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Re: Comp Cams 30-30 camshaft

Bill;
The chain I have is a cloyes double roller. With only a 4 degree advance/retard slot in the keyway. Should I get a new chain and which one?
Todd

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