Camshafts almost done - ZR-1 Net Registry Forums

tpepmeie · 03-16-2010

Thought I would go with the full 360 degree duration on my new cams

just kidding. Here are the semi finished lobes. off to the heat treat furnace now...

ZZZZZR1 · 03-16-2010

Wow!

Looks great!!!!!!!!!!

Jagdpanzer · 03-16-2010

Looking good!
Which shop is doing the work?

Polo-1 · 03-16-2010

those look like some mighty BIG lobes

Take full advantage of those heads, it's going to be one BAD 427

Locobob · 03-16-2010

So what's the full story on the cams?

Pete · 03-17-2010

Specs?????

Pete

Topfuel · 08-04-2010

Did you look into valve seat angles on our N/A motors we have found a lot of flow below .050" lift. Right when the valve comes off the seat basically it a a radius grind on the valve and seat.
I was looking into Valve springs for my turbo motor since the boost pushes against the surface area of the valve there by decreasing the effective spring pressure. I looked into behive and liked the natrual harmonic of the spring is very high. Just would have to have custom valve spring retainers made didn't want to go thru that. Isky has springs made for Fiat that will work and have a couple of sets not that it will do you anygood now. Also valve lift would be at coil bind before .5 lift. You can get Ti springs made that is what prostock and Top Alchol motors are now using you can lower spring pressure and use single spring to 10500 rpm. Lower pressure = less paracitic loss in the engine. The cams look fantastic. A lot of work! More flow can be acheaved on valve seat and the pocket area of the port that is where most head porters are now spending a lot of thier time. Again WOW on the cams. my .02 worth

tpepmeie · 12-31-2010

Degreed the cams yesterday. As everyone says... the first one took about 3 hours, mostly because we couldn't get a reliable measurement on the darn thing. After that, things got faster and we mounted the dial indicator differently.

Ended up making the small adjustments by moving the cams to the right lift at the specified .050 opening point. Took an average of 6 readings (.020, .050, .200, opening side and closing side) to verify the centerline. Got all but one to less than a degree from spec. The LH intake cam is 1 degree retarded. Close enough for me!

Only wasted one $16 bolt on the first one we set. It moved three degrees out when we torqued it.

Dyno session set for week of 17 Jan.

Todd

P.S. Sam, how did your motor turn out?

Polo-1 · 12-31-2010

you must have all your parts from Greg

Cant wait to hear some dyno #'s.

Hope to have mine in Jim's car this spring and get some final tuning and #'s on it.

those cams are fun to time by yourself

Pete · 01-01-2011

Todd,can't wait to hear & see that monster run.

A long wait but well worth it,you'll forget all about the work and money you put in her the first time you hit 7500.

Happy New Year
Pete

03-16-2010	#1
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 815	Camshafts almost done Thought I would go with the full 360 degree duration on my new cams just kidding. Here are the semi finished lobes. off to the heat treat furnace now...

03-16-2010	#2
ZZZZZR1 Banned BANNED Join Date: Oct 2006 Location: MD Posts: 3,690	Re: Camshafts almost done Wow! Looks great!!!!!!!!!!

03-16-2010	#3
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,661	Re: Camshafts almost done Looking good! Which shop is doing the work?

03-16-2010	#4
Polo-1 Join Date: Sep 2005 Location: Washington Posts: 955	Re: Camshafts almost done those look like some mighty BIG lobes Take full advantage of those heads, it's going to be one BAD 427

03-16-2010	#5
Locobob Join Date: Jan 2004 Location: Portland, OR Posts: 1,057	Re: Camshafts almost done So what's the full story on the cams? __________________ Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368

03-17-2010	#6
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,679	Re: Camshafts almost done Specs????? Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage

08-04-2010	#7
Topfuel Join Date: Jan 2009 Location: Albuquerque Posts: 43	Re: Camshafts almost done Did you look into valve seat angles on our N/A motors we have found a lot of flow below .050" lift. Right when the valve comes off the seat basically it a a radius grind on the valve and seat. I was looking into Valve springs for my turbo motor since the boost pushes against the surface area of the valve there by decreasing the effective spring pressure. I looked into behive and liked the natrual harmonic of the spring is very high. Just would have to have custom valve spring retainers made didn't want to go thru that. Isky has springs made for Fiat that will work and have a couple of sets not that it will do you anygood now. Also valve lift would be at coil bind before .5 lift. You can get Ti springs made that is what prostock and Top Alchol motors are now using you can lower spring pressure and use single spring to 10500 rpm. Lower pressure = less paracitic loss in the engine. The cams look fantastic. A lot of work! More flow can be acheaved on valve seat and the pocket area of the port that is where most head porters are now spending a lot of thier time. Again WOW on the cams. my .02 worth

12-31-2010	#8
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 815	Re: Camshafts almost done Degreed the cams yesterday. As everyone says... the first one took about 3 hours, mostly because we couldn't get a reliable measurement on the darn thing. After that, things got faster and we mounted the dial indicator differently. Ended up making the small adjustments by moving the cams to the right lift at the specified .050 opening point. Took an average of 6 readings (.020, .050, .200, opening side and closing side) to verify the centerline. Got all but one to less than a degree from spec. The LH intake cam is 1 degree retarded. Close enough for me! Only wasted one $16 bolt on the first one we set. It moved three degrees out when we torqued it. Dyno session set for week of 17 Jan. Todd P.S. Sam, how did your motor turn out?

12-31-2010	#9
Polo-1 Join Date: Sep 2005 Location: Washington Posts: 955	Re: Camshafts almost done you must have all your parts from Greg Cant wait to hear some dyno #'s. Hope to have mine in Jim's car this spring and get some final tuning and #'s on it. those cams are fun to time by yourself

01-01-2011	#10
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,679	Re: Camshafts almost done Todd,can't wait to hear & see that monster run. A long wait but well worth it,you'll forget all about the work and money you put in her the first time you hit 7500. Happy New Year Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage

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