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Author Topic:   Bigger Cam?
jsracingbbf
Gearhead

Posts: 2160
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 02-28-2003 11:43 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Several racers I know have suggested my CAM is too small for my application. Truthfully when I bought the cam the car had stock heads and the car itself was heavier. It is a solid roller. Here are the cam specs:

Intake Dur = 265 @ .050
Exhaust Dur. = 275 @ .050
Intake & exhaust lift = 709
Lobe seperation = 110
Lash is .030

Its one of John's special grinds (Bullet)
Rockers are Comp rollers 1.76
CR= 12.5:1
CID = 514

Aluminum SCJ heads ( old style ) ported
Wieand tunnel ram ported to match the heads
enderle alky injected hat
2 18th " primaries : 4" collectors
2 speed power glitch 1.76 low gear; 4.56 rear gears
32 X 14 GY's

Car weighs 2800 lbs with me in it. ( big ole boy )

I have had it suggested to me to buy a cam with at least 750 lift. What do the CAM gurus here think? No fighting please
BTW this motor was built for approx. $7000.00 including the injection.

------------------
Jerry
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car
"This is FORD Country! On a Quiet night you can hear a Chevy Rust"

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cracing
Gearhead

Posts: 159
From: Saltillo Miss. USA
Registered: Jan 2002

posted 03-01-2003 12:52 AM     Click Here to See the Profile for cracing   Click Here to Email cracing     Edit/Delete Message   Reply w/Quote
Sounds pretty close for our 1/2 race tracks there big ole boy! Should pull real good with that gear & 1.76. Dont need much cam for the RPM range you/we will be in. Got Torque? Oh yes!

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jsracingbbf
Gearhead

Posts: 2160
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 03-01-2003 11:43 AM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
must be the cam Gurus week off
JS

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jsracingbbf
Gearhead

Posts: 2160
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 03-02-2003 02:26 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Second thought, it MUST be the perfect grind, silence gives CONSENT. I'm kind of lacking in the cam and convertor dept on knowledge, thanks for all the help
JS

PS: Thanks Bob at least you replied, I figured even Clam head would say something smart alleck. (shrugs)

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steve'66
Gearhead

Posts: 7226
From: Sonoma,CA,USA
Registered: Mar 2000

posted 03-02-2003 11:02 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Jerry,

I'm no cam "expert" but I like the cam you're running. Too many folks run too big a cam. It's matched to your convertor right? Run it and enjoy.

SteveW

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jsracingbbf
Gearhead

Posts: 2160
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 03-03-2003 12:35 AM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Thanks Steve, I am certainly not a cam expert. Bob sent me some good advice on setting my lash, so I'm good to go. I don't know what I was thinking anyway, I'm very close to cranking up. Can't second guess cam choices now.

------------------
Jerry
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car
"This is FORD Country! On a Quiet night you can hear a Chevy Rust"

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Moneymaker
Administrator

Posts: 21725
From: Lyons, IL, USA
Registered: May 99

posted 03-03-2003 12:40 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
When you exceed .750 lift valve spring life becomes a serious issue and consideration.
A larger cam may and probably will make more power, but at the cost of some consistancy in the heat and half the current valve spring life you now enjoy.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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jsracingbbf
Gearhead

Posts: 2160
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 03-03-2003 12:51 AM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Good Info thanks Alex
JS

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Moneymaker
Administrator

Posts: 21725
From: Lyons, IL, USA
Registered: May 99

posted 03-03-2003 12:53 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
One way to see if it wants a bigger cam is to tighten up the lash .008 to .010. If it picks up it wants a bigger cam.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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'69Stang
Gearhead

Posts: 205
From: Detroit, MI USA
Registered: Jan 2002

posted 03-03-2003 09:16 AM     Click Here to See the Profile for '69Stang   Click Here to Email '69Stang     Edit/Delete Message   Reply w/Quote
Alex: How much can the lash be safely tightened up on a solid/solid roller?
For example if the cam card calls for .020 is it o.k. to go to .010, or .005?

And does the shortening of the lash effect the duration of the cam besides the lift? It seems as if it would......

[This message has been edited by '69Stang (edited 03-03-2003).]

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'69Stang
Gearhead

Posts: 205
From: Detroit, MI USA
Registered: Jan 2002

posted 03-03-2003 11:23 AM     Click Here to See the Profile for '69Stang   Click Here to Email '69Stang     Edit/Delete Message   Reply w/Quote
TTT

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Moneymaker
Administrator

Posts: 21725
From: Lyons, IL, USA
Registered: May 99

posted 03-03-2003 12:00 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by '69Stang:
Alex: How much can the lash be safely tightened up on a solid/solid roller?
For example if the cam card calls for .020 is it o.k. to go to .010, or .005?

And does the shortening of the lash effect the duration of the cam besides the lift? It seems as if it would......

[This message has been edited by '69Stang (edited 03-03-2003).]


Safely?
I guess that's a difficult question to answer.
I guess to be dead safe then variances of .015 either way would have to be the limit. I have personally opened up the lash on certain solid roller cams as much as .025 and seen improvements. This was for testing purposes.
I regularly loosen the lash on MM and some other SS racer friends engines .010 to .015 for one or two blasts. This is for situations where we are needing to pick up a tenth or more. It's hard on the valve train as the lifters litterally get launched off the cam. With "good" parts, there hasn't been a problem of any kind. Some of the racers we have helped like the performance enhancment so much that they have left them at .040 or .045. After 50-60 runs all is still well. Most of these racers are bracket racers who can't afford to change roller cams at the drop of a hat and were misguided on their initial cam selection.
So to answer your question, I'd say you are pretty much dead safe at .015 either way with good parts.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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'69Stang
Gearhead

Posts: 205
From: Detroit, MI USA
Registered: Jan 2002

posted 03-03-2003 03:18 PM     Click Here to See the Profile for '69Stang   Click Here to Email '69Stang     Edit/Delete Message   Reply w/Quote
Thanks Alex, I think I will tighten mine up .010 and see how it likes it.

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