Cam help

So if I move three degrees I should be three on all 4 spots.

 

Draw a cross, put the center of the degree wheel at the intersection of the lines. Each line needs to extend last the wheel so you can see if the lines line up with the marks in the wheel. Hope that makes better sense.

 

Yes think I get it.

 

ok so I checked the #1 intake lobe again and it come out the same :
atdc .1.5+26.5+180=208/2=104+1.5=105.5

so I checked #6 intake
atdc 1.5+26+180=207.5/2=103.75+1.5=105.25

so should I run it? I guess I just don't understand why the close number (26) is so far off from the card (41.5) and the duration is off (208) and card says (223).
will this hurt me.

 

Sounds like it was either built wrong or packaged wrong. Are there any TA cams with that duration? TA made a custom cam for me, they put the wrong lobe on and wouldn't take it back. They said they would try harder next time. I never bought from them again.

 

Looks like I`ll be calling mike at TA Monday .

 

It sure looks like the lobes are ground with less duration than spec.
I believe TA has a cam doctor where they can check the lobe profiles.

 

Yes I could live with .291 max life but not .26 on the closing of the intake I think that would be a big loss of power. I want to thank you guys for your help!

 

Really? TA made you eat THEIR mistake? Thats is just wrong if that is the case! WOW!!

No ones perfect,people do make mistakes,but that is just WRONG to make someone else pay for it. Not a good way to do business IMO. I can understand no refunds on custom orders,but that should only apply if you get what was ordered.

I hope bbb72 doesn't have the same problem with TA as you did Rob. Looks like now everyone needs to check that they got the cam they ordered from TA because whoever is grinding cams for them doesn't have a very good quality control process if any at all. Hopefully bbb72 case is an isolated incedent and TA rectifies the situation,keep us posted on how TA treats you after you call them,I have parts to buy and will look elsewhere if they don't take care of you. Thanks


Derek

 

I hope he doesn't either.

 

I never bought a cam from TA but the Kenne Bell cams they say what the intake centerline is and I run it across the top of the lobe .050 both sides in the clockwise rotation and I have to change the chain/gear alignment to get close to 1 or 2 degrees and that's it. Car runs great. I checked the valve opening and closing and it was always off. I told Fred that and he said don't worry about that just make sure it is in at the intake centerline. My car always runs 11/0's or 10/80's depending on the weather with stock compression. 3485 LBS

 

I have the bottom Gear in at +4 and my c/l is right there at 105.75 ,need 106 . My lobe is closing at .26 and cam card says should be 41.5 . That tells me the valve is not staying open as long as it should be. now if it was coming in at 39 or 40 I would run it but closing 15 * before it should just seems to me a big loss of power. Maybe I'm wrong and if I am please tell me I would love to get this motor done.

 

You are correct.

The .050" opening and closing points are one of the key factors in determining the power band the cam will produce.
The specs you are showing is close to a RV profile.
Just call TA and get it sorted out.

What were the readings on the exhaust lobe?

 

Exhaust was just as bad open @ .49 ABDC and closes at .67 ATDC card calls for open .45 BBDC close .5 ATDC.

 

with the cam advanced 4 degrees the exhaust should open 49* BBDC and close 1* ATDC.

Your 49* number would have been correct if it were BBDC.
There is no way you could have gotten 67 ATDC.


You need to try the exhaust lobe measurement again before you call TA.

 

Here is a pic.

 

How about now.

 

He attached an image of the degree wheel showing the pointer at about 67 or 68 degrees BTDC if I'm looking at it right. Sorry, I haven't read the thread from the beginning to see what's going on.

No problem seeing the attachment on my side.

Devon

 

Ok I'm seeing the pic.

Since the crank turns clockwise that would be 67* Before TDC. Right?
Something is way off on the setup.
There is no open or close .050" point on a TA 284 cam that would even come close to 67* BTDC no matter what duration it was ground at.

With the intake lobe center @ 106* ATDC
Intake Opens 5.5* BTDC
Intake closes 37.5* ABDC

With the exhaust lobe center @ 114* BTDC
Exhaust opens 49* BBDC
Exhaust closes 1* ATDC

Paul

 

I know what your saying I`ll check it again tonight when I get home from work. I will check it a few times , each time re- setting the indicator.

But we know the intake is off 15*