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1st time degreeing cam?cam is now@103.5* ( UPDATED)
#614682
02/16/10 03:20 PM
02/16/10 03:20 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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motor is 340 stroker,ohio crankshaft 4" stroke crank,diamond dish pistons,herbert solid roller cam,pro gear 7 key timing set with tensioner,this is my 1st time degreeing a cam,i have a 11" moroso degree wheel,comp cam crank socket mounted tightly on the crank,ifound top dead center by using a positive stop rotating clockwise til it stopped, took reading on degree wheel,then turned it counterclockwise took another reading when it stopped, i then split the difference of the 2 readings and set the degree wheel to 0, i then set my indicator up on the deck surface with a pushrod contacting the indicator rotated clockwiseto find max lift ,then set the indicator to 0,rotated clockwise to .050 after max lift took a reading continued to turn clockwise to .050 before max lift took another reading.160*+80*=240*/2*=120*i am open to any suggestions as this is my 1st time degreeing a cam in.the cam is 108 lobe center installed at 104*,the cam was bought from moparts member and installed in his motor at 104* thanks again mike
Last edited by hp340nos; 02/20/10 10:30 PM.
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Re: 1st timedegreeing cam?cam is at 120 what did i do wrong
[Re: maximum entropy]
#614684
02/16/10 03:59 PM
02/16/10 03:59 PM
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Joined: Apr 2005
Posts: 1,880
USA
Ron Silva
top fuel
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top fuel
Joined: Apr 2005
Posts: 1,880
USA
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Don't do what I just did. I set up on the #1 cylinder EXHAUST lobe. DOH!
The intake is the second lobe, not the first. And, you might come up with 120 if you did the exhaust.
Last edited by dragrcr97; 02/16/10 04:00 PM.
SRT DEMON ONE SEAT
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Re: 1st timedegreeing cam?cam is at 120 what did i do wrong
[Re: hp340nos]
#614687
02/16/10 06:17 PM
02/16/10 06:17 PM
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Joined: Aug 2003
Posts: 43,127
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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Quote:
yes i double checked that i was on the intake lobe not the exhaust lobe,what should i do to correct this?cam gear has up to +3/-3 degrees of adjustability.thanks mike
On most Cloyes double roller timing sets one tooth on the cam gear is 12 degrees of crankshaft travel, try moving the cam gear one tooth to the right of where it is now and redo the cam timing sequence  Once you get the intake timing where your happy make sure and check the exahust lobe centers, it should be advanced as much as the intake lobe is, IE Intake (Max lift) Lobe Center is 105 ATDC on a 108 LSA cam the Exhaust Lobe Center should be at 111 BTDC If not the cam is not ground on the LSA the cam card says, return it to the cam company if it is not correct. BTW, those mulltiple keyway crank gears can be a real challenge to degree in correctly   Like all things worth doing correctly, the first time is the hardest  
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: hp340nos]
#614688
02/16/10 06:18 PM
02/16/10 06:18 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Verify that the dots/symbols are lined up correctly. You can use a speed square off the top of the block somewhere to give you a better visual center line to align the marks. Also note that every time you change the crank sprocket key way you have also changed TDC postions so TDC would need to be found again. If it still doesnt come clear, sometimes those degree wheels are marked funky. Go back to the basics, find .050 past max lift, then mark the degree wheel with a sharpie. Then find .050 before max lift and mark it too. Now look were both marks are on the degree wheel. Count each degree between the two, then divide by two. It should produce the same numbers. Rotate the engine around more than once recording each event. Sometimes its easy to loose a bit in slack or what ever. Keep doing it until you keep producing the same results. But remember about moving the crank keys..you gotta find the new TDC again, a bunch of people dont, its not worth the trouble of doing it then IMO. This is why I like the cam sprocket bushings. 
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: 1st timedegreeing cam?cam is at 120 what did i do wrong
[Re: hp340nos]
#614689
02/16/10 06:19 PM
02/16/10 06:19 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
yes i double checked that i was on the intake lobe not the exhaust lobe,what should i do to correct this?cam gear has up to +3/-3 degrees of adjustability.thanks mike
Your 16* off that should be 1 tooth and the 3 degrees
if I remember right(I think its 13 degrees per tooth)
count the teeth and divide that into 360
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Re: 1st timedegreeing cam?cam is at 120 what did i do wrong
[Re: 602heavy]
#614696
02/17/10 02:01 AM
02/17/10 02:01 AM
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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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the timing marks seem to be lined up,im gonna rotate cam gear a tooth and see what happens.maybe timing dots are not located properly on the gears?
Last edited by hp340nos; 02/17/10 02:03 AM.
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Re: 1st timedegreeing cam?cam is at 120 what did i do wrong
[Re: 602heavy]
#614699
02/17/10 12:09 PM
02/17/10 12:09 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
To save some time  .............remove the front gear off the cam & get the intake lifter @ full lift , using degree wheel set the crank @ 106* ATDC , remove degree wheel , fit chain to crank sprocket with cam gear attached , eye up position of cam gear regards locating peg on cam , you can then rotate crank sprocket on keyway for best alignment with cam peg/gear , just makes life easier as opposed to removing degree wheel every time you gotta move sprocket around.
This is the procedure I use for setting up my gear
drive on my small blocks... seems to make things
easier and quicker.... JMO
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Re: 1st timedegreeing cam?cam is at 120 what did i do wrong
[Re: hp340nos]
#614701
02/17/10 04:33 PM
02/17/10 04:33 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:
i verified tdc with piston stop then rotated cam gear 1 tooth counterclockwise 133* oops went wrong way,back through the whole process again went the other way clockwise 1 tooth from original postion came up with 147.5+66.5=214/2=107 ,i am getting close,cam is recommended to be installed at 104* i have some keyways on the cam gear i can move to try to get the other 3*,how close do you want it to be?looks like timing mark on the cam is marked 1 tooth off,marks are not inline.
You should be able to get within 1 degree , 2 degrees is no biggie but i would'nt want to go more than that.
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