Cam grinding

[efnfast]

Soooo, how do you grind a cam and give it more lift? Seems to me if you grind it you'll give it less lift. Longer lifters and grind on the closed side? TIA -Steve

[LGAFF]

The base cricle is reduced so in relation to the reduced base circle there is more lift

[Dynomite]

Originally Posted by LGAFF

The base cricle is reduced so in relation to the reduced base circle there is more lift

Since you are reducing base circle you have to check Lifters to make sure you do not run out of Lifter uncompressed Height.

See 10 Posts regarding Lifters/Valves/Camshafts LT5 New Rebuild Issues (Lifters and Camshafts)

And......since you now have more Valve Lift you have to check Camshaft Timing to make sure you do not have Valve Interference with Pistions at TDC (the Eyebrows)

CAMSHAFT TIMING
Post 21 - LT5 Camshaft Specifications and Camshaft General Timing (pinning)
Post 22 - LT5 Camshaft Specific Timing (degree wheel)
Post 23 - LT5 Camshaft Timing Additional Tricks
Post 24 - LT5 Timing Diagrams and Timing Chain Effective Lengths
Post 25 - LT5 Timing Chains and Sprockets

[efnfast]

Thanks guys, every time I heard about cam grinding had me thinking.

[Bob Eyres]

Got me thinking too. I've often wondered why LT5 reground cams are so expensive. Even considering the fact that there are four of them.
If there is a program for the grinding machine, it's not a long "hand labor" situation then it should be a pretty straightforward procedure to do four cams.

Maybe I'm just "livin in the past". Remember the "Corvette Duntov Cam" for small blocks back in the day? What was that? Less than a hundred bucks?

[LGAFF]

Profile development costs $, then you have to do 4 of them and as with anything the rarity of the parts

[Dynomite]

Originally Posted by LGAFF

Profile development costs $, then you have to do 4 of them and as with anything the rarity of the parts

The Reground Intake gives you the most additional power....not so much the Reground Exhaust....but let Pete the Cam Guru Explain.

Both XfireZ51 and myself have taken a peak at our reground Cams after hours of run time and found nothing out of order in regard to Camshaft or Cam Journal wear.

Originally Posted by efnfast

What are the down sides of a more aggresive profile? Idle, fuel mileage, more broken parts?

Maybe a bit rougher idle (depends if you Regrind BOTH Intake and Exhaust), no appreciable difference in fuel mileage (maybe a bit less), No Broken Parts. Watch carefully when installing Reground Cams regarding Lifters and Camshaft Timing as suggested

Again....here on this Forum Pete the Cam Guru is the GO TO GUY on Camshaft Regrinds as he has proven in his 1/4 mile times

You can ask Pete about Camshaft Hardening which is not an issue with the Camshaft Regrinds as the Camshaft Grinding does not get past the Hardened Surface.

LT5 New Rebuild Issues (Lifters and Camshafts)

Post 21 - LT5 Camshaft Specifications and Camshaft General Timing (pinning)

[Blue Flame Restorations]

I have Pete's cams in my 91 Turq car. It makes my bone stock Purple 95 feel like a luxury car, in comparison. Man, I'd love to mod that car's engine.

[efnfast]

What are the down sides of a more aggresive profile? Idle, fuel mileage, more broken parts?

[efnfast]

Any idea of hp on the ported, cammed 91?