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Re: 1st timedegreeing cam?cam is at 120 what did i do wrong
[Re: hp340nos]
#614722
02/18/10 03:10 PM
02/18/10 03:10 PM
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Joined: Dec 2008
Posts: 1,200
UK
602heavy
pro stock
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pro stock
Joined: Dec 2008
Posts: 1,200
UK
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Quote:
my degree wheel has intake open/intake closed marked in red as well as exhaust open/closed marked.its also marked 0-180 then180-0.how do i know where btdc ,atdc etc are should i just watch the piston movement,thanks mike
It does get confusing  , you just gotta count backwards , take a step back & figure where the piston is in relationship with degree wheel markings , you've come this far i'm sure you will sort it , as said , you are not alone regards the confusion with those degree wheels , if the maths is all funnky then check again , it will come good.
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Re: 1st timedegreeing cam?cam is at 120 what did i do wrong
[Re: hp340nos]
#614724
02/18/10 06:45 PM
02/18/10 06:45 PM
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Joined: Aug 2003
Posts: 43,097
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,097
Bend,OR USA
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Quote:
im heading out to work now i will check it out in the mornin,thanks again everyone mike
some degree wheels are marked with TDC =0 (top dead center), 90 degrees after TDC, BDC(bottom dead center) = 180 after top dead center and some are marked 90 again BTDC(before top dead center or ABDC after bottom dead center)  ) or 270, 270 = ATDC(after top dead center)  Some degree wheels are marked both ways  Keep in mind that all 90 degree V8 motors have two pistons that are at TDC at the same time, two at 90 ATDC, two at BDC and two at 90 ABDC or 90 degrees BTDC. Not all of them are at all four major points of the crankshaft revoluton at the same time, I think anyways My point is there are two pistons at TDC at the same time, #1 is in overlap beginning the #1 intake stroke and finishing the exhaust stroke while #6 is at the top of the compression stroke and starting down on the power stroke Another thing to keep in mind is the camshaft gear and cam move 1/2 the degrees that the crankshafts moves when rotating the crankshaft AND we always measure camshaft timing in CRANKSHAFT degrees  HUH I hope this helps and makes sense  Don't forget to check piston to valve clearances before starting the motor  Especially on a roller cam like you have 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 1st timedegreeing cam?cam is at 120 what did i do wrong
[Re: Cab_Burge]
#614725
02/18/10 08:06 PM
02/18/10 08:06 PM
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Joined: Dec 2008
Posts: 1,200
UK
602heavy
pro stock
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pro stock
Joined: Dec 2008
Posts: 1,200
UK
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Quote:
Quote:
im heading out to work now i will check it out in the mornin,thanks again everyone mike
some degree wheels are marked with TDC =0 (top dead center), 90 degrees after TDC, BDC(bottom dead center) = 180 after top dead center and some are marked 90 again BTDC(before top dead center or ABDC after bottom dead center) ) or 270, 270 = ATDC(after top dead center) Some degree wheels are marked both ways Keep in mind that all 90 degree V8 motors have two pistons that are at TDC at the same time, two at 90 ATDC, two at BDC and two at 90 ABDC or 90 degrees BTDC. Not all of them are at all four major points of the crankshaft revoluton at the same time, I think anyways My point is there are two pistons at TDC at the same time, #1 is in overlap beginning the #1 intake stroke and finishing the exhaust stroke while #6 is at the top of the compression stroke and starting down on the power stroke Another thing to keep in mind is the camshaft gear and cam move 1/2 the degrees that the crankshafts moves when rotating the crankshaft AND we always measure camshaft timing in CRANKSHAFT degrees HUH I hope this helps and makes sense Don't forget to check piston to valve clearances before starting the motor Especially on a roller cam like you have
This is making my head hurt  , as you say , fireing order is 90 crank degrees appart. 
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Re: 1st timedegreeing cam?cam is now@103.5*icl
[Re: 602heavy]
#614726
02/20/10 09:47 PM
02/20/10 09:47 PM
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Joined: Jan 2003
Posts: 1,365
elmira ny
hp340nos
OP
pro stock
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OP
pro stock
Joined: Jan 2003
Posts: 1,365
elmira ny
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cam is all degree/d in @103.5*icl now,checked all cam events and everything matches up to specs 602heavy had listed,thanks to everyone that helped.mike d.
Last edited by hp340nos; 02/20/10 10:28 PM.
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Re: 1st timedegreeing cam?cam is now@103.5*icl
[Re: hp340nos]
#614727
02/20/10 10:06 PM
02/20/10 10:06 PM
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Joined: Dec 2004
Posts: 1,489
St. Louis Mo.
10 o to go
"Happy Don"
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"Happy Don"
Joined: Dec 2004
Posts: 1,489
St. Louis Mo.
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All those key ways  .What happened to the single key way and the few keys that you would use . I remember the crank used them also but that double the degrees . Hope you found a good number , We always screw them in advance 99 to 102 on S.B cams. Dr
2009 418" build dan smith built
new 9.96 131.82
6.23 108
1.30 60 foot
best to date 9/15/09
8in 727 430 dana 2860 lb 3040 lb w driver
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