10-02-2013 | #1 |
Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,534
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Cam grinding
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
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10-02-2013 | #2 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,188
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Re: Cam grinding
The base cricle is reduced so in relation to the reduced base circle there is more lift
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
10-02-2013 | #3 | |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,824
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Camshaft Regrinds, Lifters, Valves, and Camshaft Timing
Quote:
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
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Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 10-02-2013 at 09:29 AM. |
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10-02-2013 | #4 |
Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,534
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Re: Cam grinding
Thanks guys, every time I heard about cam grinding had me thinking.
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10-02-2013 | #5 |
Join Date: Jul 2005
Location: Jupiter, Fl.
Posts: 814
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Re: Cam grinding
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? |
10-02-2013 | #6 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,188
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Re: Cam grinding
Profile development costs $, then you have to do 4 of them and as with anything the rarity of the parts
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
10-02-2013 | #7 |
Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,534
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Re: Cam grinding
What are the down sides of a more aggresive profile? Idle, fuel mileage, more broken parts?
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10-02-2013 | #8 | ||
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,824
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Re: Cam grinding
Quote:
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. Quote:
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)
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Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 10-02-2013 at 10:43 PM. |
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10-02-2013 | #9 |
Join Date: Feb 2010
Location: Pendleton, IN
Posts: 3,906
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Re: Cam grinding
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.
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1988 KOH Prototype EX5023 sold 1990 ZR-1 #444 Convertible 1990 ZR-1 Black #966 1991 ZR-1 Quazar Blue #296 1957 Duntov SS Project |
10-02-2013 | #10 |
Join Date: Jul 2005
Location: Jupiter, Fl.
Posts: 814
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Re: Cam grinding
So, are you saying that with the cams the 91' is quicker, but less tractable and less easy to drive than the 95'?
I wonder if the combination of my light flywheel and the cams will make it a strong runner, but take a whole lot of smoothness out.
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"It's about the car, not the people." 1991 ZR-1 White/Black #1236 (Owner since 1994). Stock engine with bolt-ons: Hurst shifter,"Forced Air" intake, Coplon duct, Bee Cool Radiator, Demon coils, Jeal prom, Watson headers, X pipe, 3" B&B's, Rippie flywheel, 4:10 gears, A molds, Toyo Proxes-R888's 12.06@117mph. 1.76 60ft. |
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