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Please tell me this OK... Degreeing Cam #981911 04/28/11 02:46 PM 04/28/11 02:46 PM
Joined: Aug 2008 Posts: 78 Canada/USA R ragingram OP member
ragingram OP member R Joined: Aug 2008 Posts: 78 Canada/USA	So this is my first BIG cam I am Degreeing. LSM tells me to make the Intake center line 112. So I did the whole, find true TDC. Get full lift on the intake, check .050 before, get .050 after. Take those two readings off the degree wheel and divide by two. After working at it about 20 times I got it at 112. (keith Black Gear Drive) Checked it about 5 times and it is 112. What I find really weird is that the INTAKE valve is only completly closed when the piston has 1.5inches left in its stroke (its is a 4 7/8 crank) Is this right. In my head it should be pretty closed much once the pistons starts moving up the bore. Is it getting all its compression in the last 1.5 inchs of its stroke? Could I have done anything wrong? I also checked the Intake open dregree off the cam card and it starts to open at the right spot. specs off cam card Int lift 525 Int Dur 286 Ex Lift 520 Ex Dur 312 Intakes opens 27BTDC Intake Closes 79ABDC Exhaust opens 92 BBDC Exhaust Closes 40ATDC LCA116 overlap 67

Re: Please tell me this OK... Degreeing Cam [Re: ragingram] #981912 04/28/11 03:05 PM 04/28/11 03:05 PM
Joined: Aug 2008 Posts: 78 Canada/USA R ragingram OP member
ragingram OP member R Joined: Aug 2008 Posts: 78 Canada/USA	I checked these values at .050. If I remember right that is what you are suppose to do. Intakes opens 27BTDC Intake Closes 79ABDC Exhaust opens 92 BBDC Exhaust Closes 40ATDC

Re: Please tell me this OK... Degreeing Cam [Re: ragingram] #981913 04/28/11 03:13 PM 04/28/11 03:13 PM
Joined: Feb 2007 Posts: 5,080 organ M maximum entropy master
maximum entropy master M Joined: Feb 2007 Posts: 5,080 organ	Quote: I checked these values at .050. If I remember right that is what you are suppose to do. Intakes opens 27BTDC Intake Closes 79ABDC Exhaust opens 92 BBDC Exhaust Closes 40ATDC those lift numbers are at the lobe, yes? for what is the good life if not doing things thoughtfully?

Re: Please tell me this OK... Degreeing Cam [Re: maximum entropy] #981914 04/28/11 03:50 PM 04/28/11 03:50 PM
Joined: Dec 2005 Posts: 293 Kansas City Metro M mbogina enthusiast
mbogina enthusiast M Joined: Dec 2005 Posts: 293 Kansas City Metro	A 286-312-116 LCA in at 113 would yield IO 30 IC76 EC37 EO 95 at .050 lobe lift Be a Rebel- Break the Laws of Physics!

Re: Please tell me this OK... Degreeing Cam [Re: mbogina] #981915 04/28/11 03:54 PM 04/28/11 03:54 PM
Joined: Aug 2008 Posts: 78 Canada/USA R ragingram OP member
ragingram OP member R Joined: Aug 2008 Posts: 78 Canada/USA	Quote: A 286-312-116 LCA in at 113 would yield IO 30 IC76 EC37 EO 95 at .050 lobe lift That is pretty much what they came out to be. my question is, is it right to have the intake valve finally closed when the piston only has another 1.5 inches on its compression stroke.

Re: Please tell me this OK... Degreeing Cam [Re: ragingram] #981916 04/28/11 04:00 PM 04/28/11 04:00 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	who's cam and number is it?? Scan of the card??? You say it's 4 and 7/8 stroke???? what am I missing! so thats .525 lobe lift or .7875 lift with 1.5? NOS cam?? your lash will help close the valve while lifter is lowing the last little bit. say .024 lash the valve will be fully closed with .016 lift left as it ramps down. Last edited by Dodgem; 04/28/11 04:16 PM.

Re: Please tell me this OK... Degreeing Cam [Re: ragingram] #981917 04/28/11 05:20 PM 04/28/11 05:20 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Quote: A 286-312-116 LCA in at 113 would yield IO 30 IC76 EC37 EO 95 at .050 lobe lift That is pretty much what they came out to be. my question is, is it right to have the intake valve finally closed when the piston only has another 1.5 inches on its compression stroke. I show that you have it straight up if you have the numbers right.... the piston should be at 2.09" at 72.214*... with a 116 LSA I sure hope its a turbo engine.... I took a guess at your crank of 4.860 Last edited by MR_P_BODY; 04/28/11 05:26 PM.

Re: Please tell me this OK... Degreeing Cam [Re: MR_P_BODY] #981918 04/28/11 06:14 PM 04/28/11 06:14 PM
Joined: Aug 2008 Posts: 78 Canada/USA R ragingram OP member
ragingram OP member R Joined: Aug 2008 Posts: 78 Canada/USA	I'll try to give as much info as possible. 636ci Stroke= 4.875 Bore= 4.560 Naturally Asperated Mechanical Alchy injection 1.8 rockers .024 hot lash Here is the cam card 6607467-scan0001.jpg (58 downloads)

Re: Please tell me this OK... Degreeing Cam [Re: ragingram] #981919 04/28/11 06:30 PM 04/28/11 06:30 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	You should be fine then looks like it is in at 112. what is the duration at .020 is that all they gave you?

Re: Please tell me this OK... Degreeing Cam [Re: Dodgem] #981920 04/28/11 06:37 PM 04/28/11 06:37 PM
Joined: Aug 2008 Posts: 78 Canada/USA R ragingram OP member
ragingram OP member R Joined: Aug 2008 Posts: 78 Canada/USA	Thats all they have given me. I called and asked them this same question and they weren't very helpful at all. Usually I get great help from LSM. All they told me was to make sure the Intake center line is 112 when checking it.

Re: Please tell me this OK... Degreeing Cam [Re: MR_P_BODY] #981921 04/28/11 07:12 PM 04/28/11 07:12 PM
Joined: Aug 2008 Posts: 78 Canada/USA R ragingram OP member
ragingram OP member R Joined: Aug 2008 Posts: 78 Canada/USA	Quote: Quote: Quote: A 286-312-116 LCA in at 113 would yield IO 30 IC76 EC37 EO 95 at .050 lobe lift That is pretty much what they came out to be. my question is, is it right to have the intake valve finally closed when the piston only has another 1.5 inches on its compression stroke. I show that you have it straight up if you have the numbers right.... the piston should be at 2.09" at 72.214... with a 116 LSA I sure hope its a turbo engine.... I took a guess at your crank of 4.860 You are right... When the crank is at 72 the piston is right at 2.05. The intake valve is still open .007 So since all of this is from the lobe the valve when running hot will actually be closing .024" sooner because of the valve lash?

Re: Please tell me this OK... Degreeing Cam [Re: ragingram] #981922 04/28/11 07:32 PM 04/28/11 07:32 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Why did you want to go to a 116 LSA for a N/A engine

Re: Please tell me this OK... Degreeing Cam [Re: MR_P_BODY] #981923 04/28/11 07:49 PM 04/28/11 07:49 PM
Joined: Aug 2008 Posts: 78 Canada/USA R ragingram OP member
ragingram OP member R Joined: Aug 2008 Posts: 78 Canada/USA	Quote: Why did you want to go to a 116 LSA for a N/A engine Thats a question for LSM, TFS and Tom Helmphil. They all had big parts in this engine.

Re: Please tell me this OK... Degreeing Cam [Re: ragingram] #981924 04/28/11 07:53 PM 04/28/11 07:53 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Quote: I checked these values at .050. If I remember right that is what you are suppose to do. Intakes opens 27BTDC----112 ICL = 31BTDC Intake Closes 79ABDC----112 ICL = 75ATDC Exhaust opens 92 BBDC----- 96 BBDC Exhaust Closes 40ATDC----- 36 ATDC If installed at These numbers you are in straight up at a 116 ICL If you want it installed @ a 112 as Recommended to you. Your numbers need to be , "See Above text next to yours" Last edited by Sport440; 04/28/11 10:35 PM.

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