camshaft degreeing input

Posted By: dcr

camshaft degreeing input - 07/16/11 11:25 PM

I have a ultradyne 377@.050 640 lift solid flat tappet cam Im putting in a 512 about 11.5 comp ratio My buddy ran this cam in a 451 at about 14-1 Cam card reccomends installing at 102 he had in at 104 to kill off some bottem end Now my heads dont flow as well as his and I have more cubic inch so im thinking 106 my heads flow 315 lift and is in a 3200 lbs a body with 14x32 tires and 4.88 gears probly to much gear but they are in the car and I gotta start some were 8 inch conv should be approx 5500 im guessing im hopeing that wont kill to much bottom end and help with top end charge but Im only guessing, am i off in left field?

Posted By: GomangoCuda

Re: camshaft degreeing input - 07/17/11 12:29 AM

Quote:

I have a ultradyne 377@.050 640 lift solid flat tappet cam .....

I presume you meant 277@.050 not 377.

Posted By: HEMIFRED

Re: camshaft degreeing input - 07/17/11 12:41 AM

Any place you decdie will only be a guess .I would install as recommended then after some passes evaluate what the car runs like. then use that for a baseline should any changes be needed.

Posted By: Cab_Burge

Re: camshaft degreeing input - 07/17/11 03:40 AM

I would put it in where Ultradyne recommends, 102 if you can get that, if not 101 or 103 whatever works out

Big motor, big tires,short rear gear, advanced the cam for a lot of bottom end =

at the hit of the throttle

Be ready to shift that rascal pretty quickly

Posted By: MR_P_BODY

Re: camshaft degreeing input - 07/17/11 03:52 AM

I'll take a guess that your engine is 600hp and if
so with the weight and your tire size and 5% slippage
you will see 7400 RPMs at the stripe... if you retard
the cam it'll pull longer in each gear(less torque)...
just something to think about

Posted By: dcr

Re: camshaft degreeing input - 07/17/11 06:35 PM

Quote:

I'll take a guess that your engine is 600hp and if
so with the weight and your tire size and 5% slippage
you will see 7400 RPMs at the stripe... if you retard
the cam it'll pull longer in each gear(less torque)...
just something to think about

Thanks all for your advise Mr P if im reading your post right I m thinking your thinking along the same line as I am as far as moving the power band to the right a little so I dont run out of motor at the top end its a tough combo at this point as far as not enough head or compression and prob to much gear and stall but should all work pretty well with some heads that will flow about 370 which I hope are in my future just not attainable at this time.You gonna be at martin on the 30th if so Ill look you up and thank you in person hope to have the car done by then.

Posted By: MR_P_BODY

Re: camshaft degreeing input - 07/17/11 06:47 PM

Quote:

Quote:

I'll take a guess that your engine is 600hp and if
so with the weight and your tire size and 5% slippage
you will see 7400 RPMs at the stripe... if you retard
the cam it'll pull longer in each gear(less torque)...
just something to think about

Thanks all for your advise Mr P if im reading your post right I m thinking your thinking along the same line as I am as far as moving the power band to the right a little so I dont run out of motor at the top end its a tough combo at this point as far as not enough head or compression and prob to much gear and stall but should all work pretty well with some heads that will flow about 370 which I hope are in my future just not attainable at this time.You gonna be at martin on the 30th if so Ill look you up and thank you in person hope to have the car done by then.

I dont think I'll be there... I have a customers car
to finish up and get back on my Rampage

Posted By: Brian Hafliger

Re: camshaft degreeing input - 07/17/11 07:31 PM

Quote:

I have a ultradyne [Email]377@.050[/Email] 640 lift solid flat tappet cam Im putting in a 512 about 11.5 comp ratio My buddy ran this cam in a 451 at about 14-1 Cam card reccomends installing at 102 he had in at 104 to kill off some bottem end Now my heads dont flow as well as his and I have more cubic inch so im thinking 106 my heads flow 315 lift and is in a 3200 lbs a body with 14x32 tires and 4.88 gears probly to much gear but they are in the car and I gotta start some were 8 inch conv should be approx 5500 im guessing im hopeing that wont kill to much bottom end and help with top end charge but Im only guessing, am i off in left field?

What LCA is the cam ground on?

Posted By: dcr

Re: camshaft degreeing input - 07/17/11 08:05 PM

Quote:

Quote:

I have a ultradyne [Email]377@.050[/Email] 640 lift solid flat tappet cam Im putting in a 512 about 11.5 comp ratio My buddy ran this cam in a 451 at about 14-1 Cam card reccomends installing at 102 he had in at 104 to kill off some bottem end Now my heads dont flow as well as his and I have more cubic inch so im thinking 106 my heads flow 315 lift and is in a 3200 lbs a body with 14x32 tires and 4.88 gears probly to much gear but they are in the car and I gotta start some were 8 inch conv should be approx 5500 im guessing im hopeing that wont kill to much bottom end and help with top end charge but Im only guessing, am i off in left field?

Brian the lobe seperation angle is 108 nothing on card refering to a lca..Thanks Dan
What LCA is the cam ground on?

Posted By: MR_P_BODY

Re: camshaft degreeing input - 07/17/11 08:20 PM

Quote:

Quote:

Quote:

I have a ultradyne [Email]377@.050[/Email] 640 lift solid flat tappet cam Im putting in a 512 about 11.5 comp ratio My buddy ran this cam in a 451 at about 14-1 Cam card reccomends installing at 102 he had in at 104 to kill off some bottem end Now my heads dont flow as well as his and I have more cubic inch so im thinking 106 my heads flow 315 lift and is in a 3200 lbs a body with 14x32 tires and 4.88 gears probly to much gear but they are in the car and I gotta start some were 8 inch conv should be approx 5500 im guessing im hopeing that wont kill to much bottom end and help with top end charge but Im only guessing, am i off in left field?

Brian the lobe seperation angle is 108 nothing on card refering to a lca..Thanks Dan
What LCA is the cam ground on?

LCA= lobe center angle... LSA =lobe separation angle
same thing some just call it differently

Posted By: CompWedgeEngines

Re: camshaft degreeing input - 07/17/11 08:30 PM

102-104. I'd do 104 with that combo. Heavier car I might do something different, but you'll be fine .

Posted By: dcr

Re: camshaft degreeing input - 07/18/11 03:53 PM

Thanks to all who responded now just have to make up my mind. Dan

Posted By: Crizila

Re: camshaft degreeing input - 07/18/11 04:52 PM

Quote:

Any place you decdie will only be a guess .I would install as recommended then after some passes evaluate what the car runs like. then use that for a baseline should any changes be needed.

Gotta assume the cam MFG. knows something

Posted By: Brian Hafliger

Re: camshaft degreeing input - 07/18/11 07:32 PM

This is what I would do. I would stick it in straight up.
You have plenty of gear, cid, converter. Advancing the cam will move the power band down and you don't need that.
JMO....
Brian

Posted By: dcr

Re: camshaft degreeing input - 07/18/11 09:39 PM

Quote:

This is what I would do. I would stick it in straight up.
You have plenty of gear, cid, converter. Advancing the cam will move the power band down and you don't need that.
JMO....
Brian

Brian Thanks for advise I degreed it in at 4 deg adv which netted 102 and also at 2 deg adv which netted 104.75 Im thinking those 9 keyway lower gears are just for referance lol...all cars I built in past were small block chevys and always advanced alot but Im thinking this is a different animal had it set at 104 then changed back to 102 this is a tough decision I take it you have some experiance with this cam I remembered you responding to my 432 cyl wall/valve clearance as you can see I worked that out nothing like building 2 engines at once any other advise for this combo would be greatly appreciated like to do my research and get it right I like to race not wrench on my cars trying to get it done for a all mopar race on 30th of july.

Posted By: bumps440

Re: camshaft degreeing input - 07/19/11 12:09 AM

FWIW
Anyplace that you put it, be it 102 or 104 is just a baseline starting point. NO ONE can tell you exactly where is the best place for your combination. You start somewhere and then see what it likes. That is called tuning.
I usually start +4 and work from there.

Posted By: poppaj

Re: camshaft degreeing input - 07/19/11 01:05 AM

I doubt that two degree difference is going to make a big difference either way. If the cam card says 102 that would be the smart place to start. Most cams these days have four degrees ground into them already. I would also advise you to check piston to valve clearance and coil bind along with valve train geomentry.

poppaj