Advance / Retard Cam????
#964946
04/03/11 12:32 AM
04/03/11 12:32 AM
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Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
CUDAJAS
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
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I have an Edelbrock adjustable timing chain on my 360, and the timing cover off...if I wanted to improve the lower end, woudl I advance or retard that cam. The timing chain alows, 3 degree of adjustment either way. Should I worry about the valve to piston clearance (I am running the stock dished pistons)?  Here are my current specs: 74 Cuda with a 360, Eddy torker II intake, Eddy torker Plus cam, The specs are as follows: @050 Int dur. 222 , Ex dur. 234 Lift Int .447 Ex .450 Intake Centre line 107 Ex centerline 116. About 9:1 compression. Holley 750 vac secondary carb. Dizzy has been recurved, running 20 initial, 38 total all in before 3000. 727 with stock converter (I know -its on the list!) 8-3/4 with 3.22s Thanks!
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Re: Advance / Retard Cam????
[Re: CUDAJAS]
#964948
04/03/11 12:50 AM
04/03/11 12:50 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Advance it & I'm confident you're good but if I'm reading this right you've checked/ran it straight up already?
live every 24 hour block of time like it's your last day on earth
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Re: Advance / Retard Cam????
[Re: RapidRobert]
#964949
04/03/11 12:58 AM
04/03/11 12:58 AM
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Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
CUDAJAS
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OP
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Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
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Quote:
Advance it & I'm confident you're good but if I'm reading this right you've checked/ran it straight up already?
Yep... ran it straight up for years. No issues, but low end could be better. I am concerned with the valve timing if I adavnce it. 
Jason
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Re: Advance / Retard Cam????
[Re: CUDAJAS]
#964950
04/03/11 01:06 AM
04/03/11 01:06 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Jason I would go ahead. Those pistons are way down there but for peace of mind/doing thing professionally you could take off a pair of springs w an on eng spring compressor & check
live every 24 hour block of time like it's your last day on earth
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Re: Advance / Retard Cam????
[Re: CUDAJAS]
#964953
04/07/11 11:49 PM
04/07/11 11:49 PM
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Joined: Jan 2008
Posts: 299
East Brunswick, NJ
finadk
enthusiast
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enthusiast
Joined: Jan 2008
Posts: 299
East Brunswick, NJ
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I just went through the degreeing exercise with my 408 stroker. Advancing it will improve the top end but only by a few hundred RPM. You probably wont feel (or see on a dyno) any change less than 2 degrees. If you dont feel the low end is good enough advancing it wont help. Id be afraid to retard it beyond straight up. Remelner if toy are adjusting the crank gear retarding at the crank advances the cam. Advancing at the crank retards the cam.
You may also want to check the original cam card, if may already have a certain amount of advance built in.
A higher stall converter might give you better results.
Good luck,
Scott
Last edited by finadk; 04/07/11 11:50 PM.
Scott
1956 Dodge Custom Royal Lancer (408 Stroker, 4 Wheel Disc Brakes, Rack & Pinion, 6 speed)
2002 Dodge Ram 1500 Quad Cab
1976 Corvette
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Re: Advance / Retard Cam????
[Re: CUDAJAS]
#964955
04/08/11 10:33 AM
04/08/11 10:33 AM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
I have an Edelbrock adjustable timing chain on my 360, and the timing cover off...if I wanted to improve the lower end, woudl I advance or retard that cam.
The timing chain alows, 3 degree of adjustment either way.
Should I worry about the valve to piston clearance (I am running the stock dished pistons)?
Here are my current specs:
74 Cuda with a 360,
Eddy torker II intake,
Eddy torker Plus cam,
The specs are as follows:
@050 Int dur. 222 , Ex dur. 234
Lift Int .447 Ex .450
Intake Centre line 107 Ex centerline 116.
About 9:1 compression.
Holley 750 vac secondary carb.
Dizzy has been recurved, running 20 initial, 38 total all in before 3000.
727 with stock converter (I know -its on the list!)
8-3/4 with 3.22s
Thanks!
that cam already has 5 degrees advance ground into it. why advance it more? i'd change the intake to a dual plane.
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Re: Advance / Retard Cam????
[Re: Tom Fox]
#964957
04/10/11 11:19 AM
04/10/11 11:19 AM
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Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
CUDAJAS
OP
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OP
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Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
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Quote:
with your Timing cover allredy off, why dont you go ahead and do a compression test on it as is, then advance it and do another compression test and compare them?if you see a noticable increase, then you should see more TQ.
hmmmm..tha sounds like a good idea.
So...if I advance the cam and have higher cranking compression, it would make sense to leave it advanced. If not set it back to stright up.
Of course it could alos highlight other issue with the engine...and that would suck!!! 
So no issue cranking the engine with the timing cover and damper off??? 
Jason
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Re: Advance / Retard Cam????
[Re: RapidRobert]
#964959
04/10/11 12:18 PM
04/10/11 12:18 PM
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Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
CUDAJAS
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,072
Cambridge, Ontario, Canada
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Quote:
Quote:
So...if I advance the cam and have higher cranking compression, it would make sense to leave it advanced. correct
Of course it could also highlight other issue with the engine...and that would suck!!! what issues
So no issue cranking the engine with the timing cover and damper off???
You'll have the cam bolt/washer/eccentric on & no prob just for a compression test, the crank gear wont go anywhere and as you know adv/ret it will change P/V clearance
thanks, yep the bolt and ecentric would be on.
Other issue...well I have not done a compresion check on the engine since I put it the car back on the road...and although it runs well...it does not run as strong as I would like (could be the overall combination of engine gearing etc.). But at this time I prefer to be blissfully unaware of any underlying issues that would dictate an full engine rebuild.
Good thing I am an optomistic kind a guy eh????  Who knows, everything might check out ok! 
jason
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Re: Advance / Retard Cam????
[Re: CUDAJAS]
#964960
04/10/11 12:47 PM
04/10/11 12:47 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Yes a good basic compression test will tell you ballpark if the long block is healthy (ring seal/piston wear/cam lobes) and if it's combo of parts (piston CR/cam choice/head CC) is acceptable. Then that leaves the rest of the eng (intake/carb/ex/timing and the car itself (TC/weight/gearing. Want to narrow the prob down. Good luck w it.
Last edited by RapidRobert; 04/10/11 03:58 PM.
live every 24 hour block of time like it's your last day on earth
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