cam recommendation 410 SBC - Page 6 - Yellow Bullet Forums

Go Back   Yellow Bullet Forums > Technical Section > Valvetrain - LGM Racing and Development

Valvetrain - LGM Racing and Development

Closed Thread
 
Thread Tools Display Modes
Old 09-26-2011, 11:05 PM   #76
stealthmoderacing
Senior Member
Smoked another BBC
 
stealthmoderacing's Avatar
 
Join Date: Sep 2009
Location: Palmyra,NY
Posts: 1,282
Default Re: cam recommendation 410 SBC

the cam that came out of the motor when it supposedly made 660 on the dyno was comp cams 12-726-9
it does not say its a small base circle cam.

here is the link for the cam specs

http://www.compcams.com/Company/CC/c...?csid=322&sb=2
stealthmoderacing is offline  
Sponsored Links
Advertisement
 
Old 09-27-2011, 12:26 AM   #77
CROWER
Senior Member
Smoked another BBC
 
CROWER's Avatar
 
Join Date: Feb 2010
Location: temecula california
Posts: 1,148
Default Re: cam recommendation 410 SBC

throw some calipers around it and see what lobe size you had in that shortblock then youll really know what it ran with.
CROWER is offline  
Old 09-27-2011, 01:03 AM   #78
trmnatr
Butch
Smoked Another SBC
 
trmnatr's Avatar
 
Join Date: Apr 2009
Location: Maryland
Posts: 7,664
Default Re: cam recommendation 410 SBC

Quote:
Originally Posted by stealthmoderacing View Post
the cam that came out of the motor when it supposedly made 660 on the dyno was comp cams 12-726-9
it does not say its a small base circle cam.

here is the link for the cam specs

http://www.compcams.com/Company/CC/c...?csid=322&sb=2
Measure from the base circle to the peak of the lobe, then minus the lobe lift from that number to see what your base circle is/was
trmnatr is offline  
Old 09-27-2011, 09:41 AM   #79
stealthmoderacing
Senior Member
Smoked another BBC
 
stealthmoderacing's Avatar
 
Join Date: Sep 2009
Location: Palmyra,NY
Posts: 1,282
Default Re: cam recommendation 410 SBC

I dont have the cam anymore, when i got the motor apart the cam had some spots in it i didn't like so i called the guy and he said send it back to him and he refunded some of my money.
stealthmoderacing is offline  
Old 09-27-2011, 10:54 AM   #80
CROWER
Senior Member
Smoked another BBC
 
CROWER's Avatar
 
Join Date: Feb 2010
Location: temecula california
Posts: 1,148
Default Re: cam recommendation 410 SBC

some spots you didnt like hmmm .. call him up .. have him mic it.
CROWER is offline  
Old 09-27-2011, 12:16 PM   #81
stealthmoderacing
Senior Member
Smoked another BBC
 
stealthmoderacing's Avatar
 
Join Date: Sep 2009
Location: Palmyra,NY
Posts: 1,282
Default Re: cam recommendation 410 SBC

it was discolored.... and the rear gear was missing a tooth he was running a front drive distributor. Can't i just call comp cams and have them mic one???
stealthmoderacing is offline  
Old 09-27-2011, 12:30 PM   #82
stealthmoderacing
Senior Member
Smoked another BBC
 
stealthmoderacing's Avatar
 
Join Date: Sep 2009
Location: Palmyra,NY
Posts: 1,282
Default Re: cam recommendation 410 SBC

nevermind they said all of them are different
stealthmoderacing is offline  
Old 09-27-2011, 02:27 PM   #83
trmnatr
Butch
Smoked Another SBC
 
trmnatr's Avatar
 
Join Date: Apr 2009
Location: Maryland
Posts: 7,664
Default Re: cam recommendation 410 SBC

Quote:
Originally Posted by stealthmoderacing View Post
nevermind they said all of them are different
So what is the CURRENT combo? It has went a couple ways through the thread, what exactly is the plan at this moment so you can get more help
trmnatr is offline  
Old 09-27-2011, 02:59 PM   #84
stealthmoderacing
Senior Member
Smoked another BBC
 
stealthmoderacing's Avatar
 
Join Date: Sep 2009
Location: Palmyra,NY
Posts: 1,282
Default Re: cam recommendation 410 SBC

to keep the heads i have
stealthmoderacing is offline  
Old 09-27-2011, 04:13 PM   #85
cstraub
Senior Member
Smoked another BBC
 
Join Date: Jan 2009
Posts: 2,078
Default Re: cam recommendation 410 SBC

If we keep the OP's max rpm range cam would be:

800/720
283/281
109 Sep

If we turn the engine to 7000 rpm:
720/690
263/271
108
cstraub is offline  
Old 09-27-2011, 04:17 PM   #86
stealthmoderacing
Senior Member
Smoked another BBC
 
stealthmoderacing's Avatar
 
Join Date: Sep 2009
Location: Palmyra,NY
Posts: 1,282
Default Re: cam recommendation 410 SBC

turning it to 7000 seems like a safer way to go correct??
stealthmoderacing is offline  
Old 09-27-2011, 06:51 PM   #87
trmnatr
Butch
Smoked Another SBC
 
trmnatr's Avatar
 
Join Date: Apr 2009
Location: Maryland
Posts: 7,664
Default Re: cam recommendation 410 SBC

Quote:
Originally Posted by stealthmoderacing View Post
turning it to 7000 seems like a safer way to go correct??
ET Goals???

For 6500rpm I would use this, but shift 800-1200rpm over stall RPM
290/306 @.020"
260/268 @.050"
184/183 @.200"
.670"/.625"
106 lobe center
.960" base circle
.012"/.018" lash

This cam has been 8.40's at 1850 weight, with stud rockers and 5/16" pushrods. A good solid platform would gain no less than two tenths down the 1/4 mile

If you want to raise the RPM up a little in the lights to 7000rpm, but still shifting 800-1200rpm over the stall RPM go with the below camshaft
298/314 @.020"
268/276 @.050"
191/190 @.200"
.670"/.625"
106 lobe center
.960" base circle
.012"/.018" lash

You can go 1.5/1.6 rockers (.670"/.666"), or 1.6/1.6 rockers (.715"/.666"). If using the higher ratio rockers, that would be best.
96886-16 Crane 1.55" Springs
225 @2.000"
255 @1.950"
285 @1.900"

715 @1.250"
750 @1.200"
1.150" coil bind
652 pounds per inch spring rate

Set the seat pressure on the intake valves at 285 seat and 750 open as long as your using shaft mounted rocker arms and 1.6 ratio on the intake. Set the exhaust springs up at 255 seat and 685 open with 1.6 exhaust rockers.

After 20-25 passes, verify spring pressure and shim as needed to maintain this pressure above. You will see a 5 to 10 pound drop. I would also use a Ti Retainers, part number 99634-16 on the 10 Ti Retainers
trmnatr is offline  
Old 09-27-2011, 07:12 PM   #88
trmnatr
Butch
Smoked Another SBC
 
trmnatr's Avatar
 
Join Date: Apr 2009
Location: Maryland
Posts: 7,664
Default Re: cam recommendation 410 SBC

Quote:
Originally Posted by stealthmoderacing View Post
turning it to 7000 seems like a safer way to go correct??
By the way, if you don't have lifters I would look at the Crane Ultra Pro lifters. I would use no less than a 3/8" .080" pushrod in there, The Crane's will do well. If you can fit 7/16" that would be better yet

One key thing is, make sure there is not excessive clearance where the pushrod passes through the head, so it doesn't have room to flex and cause valve train seperation aka lash up the ramp or over nose
trmnatr is offline  
Old 09-28-2011, 03:44 AM   #89
1997bird
Member
Pullin gears
 
1997bird's Avatar
 
Join Date: Mar 2010
Location: Aztec, NM
Posts: 706
Default Re: cam recommendation 410 SBC

Quote:
Originally Posted by stealthmoderacing View Post
turning it to 7000 seems like a safer way to go correct??
It all depends on what parts you used in your engine, but your parts will wear less than the same engine at 7500 rpm or 8000 rpm. Just depends on what your goals are for the car to run in the 1/8 or 1/4 mile. This is my take on this engine combo that you have right now:

Crane lobes
299/302 @.020"
270/270 @.050"
191/193 @.200"
.723"/.714" w/1.6 rockers
.018"/.018" lash
110 LSA
108 ICL

Now then this cam is a slightly scaled down version from some Erson lobes that worked very well for my customer's 413 SBC dragster from earlier in the thread. However this Crane cam has more area @.200" than the Erson cam 191/193 vs. 189/191.
__________________


"The masses have never thirsted after truth. They turn aside from evidence that is not to their taste, preferring to deify error, if error seduce them. Whoever can supply them with illusions is easily their master; whoever attempts to destroy their illusions is always their victim."
1997bird is offline  
Old 09-28-2011, 09:48 AM   #90
stealthmoderacing
Senior Member
Smoked another BBC
 
stealthmoderacing's Avatar
 
Join Date: Sep 2009
Location: Palmyra,NY
Posts: 1,282
Default Re: cam recommendation 410 SBC

my car with me in it weighs 1730 on the nose race ready, with my canted valve dry sump motor. I figure my standard sbc is gonna be about 30lbs lighter. so 1700lbs race ready. in all honesty i dont really care what ET it runs aslong as its faster than 8.50 which i think is a pretty easy goal with my light car. In a perfect world i would like to be 5.0's and 8.0's on motor and 4.80' and on a 200 shot. so i guess that would be the goal
stealthmoderacing is offline  
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -4. The time now is 04:06 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
Resources saved on this page: MySQL 2.74%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Yellow Bullet LLC