Lunati vs Comp Cams
Thread Starter
Race Director
Joined: Nov 2006
Posts: 19,445
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From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
Lunati vs Comp Cams
I am working on a set of aluminum heads (Fastburn GM) for my 383 build.
I need springs to match up to a hydraulic roller cam (Comp).
It specs for the Comp 26918 in the beehive series. They sell in the $175 dollar range and are basically the same as the LS1 beehive springs.
But Lunati has the 74818 series at same specs and they can be as low as $130.
How do you guys view Lunati vs Comp?
And how about using LS1 HP replacement springs for same application?
Thanks
Bman
I need springs to match up to a hydraulic roller cam (Comp).
It specs for the Comp 26918 in the beehive series. They sell in the $175 dollar range and are basically the same as the LS1 beehive springs.
But Lunati has the 74818 series at same specs and they can be as low as $130.
How do you guys view Lunati vs Comp?
And how about using LS1 HP replacement springs for same application?
Thanks
Bman
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
Both companies sell high quality stuff. Neither of them are making their own springs.
The spring rate on the Comp springs is 372 lbs/in
The spring rate on the Lunati springs is 313 lbs/in
Since you have a Comp cam, & they spec'ed the springs I would run the Comp springs.
The spring rate on the Comp springs is 372 lbs/in
The spring rate on the Lunati springs is 313 lbs/in
Since you have a Comp cam, & they spec'ed the springs I would run the Comp springs.
Thread Starter
Race Director
Joined: Nov 2006
Posts: 19,445
Likes: 349
From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
Both companies sell high quality stuff. Neither of them are making their own springs.
The spring rate on the Comp springs is 372 lbs/in
The spring rate on the Lunati springs is 313 lbs/in
Since you have a Comp cam, & they spec'ed the springs I would run the Comp springs.
The spring rate on the Comp springs is 372 lbs/in
The spring rate on the Lunati springs is 313 lbs/in
Since you have a Comp cam, & they spec'ed the springs I would run the Comp springs.
Here is the cam I have:
http://www.summitracing.com/parts/CCA-12-601-8/
I plan on using the 918 specs as I want to go with the .600 lift capability. The 981 has only .525 lift capability.
Comments, please?
Bman
Last edited by bmans vette; May 14, 2010 at 04:22 PM. Reason: info correction
Thread Starter
Race Director
Joined: Nov 2006
Posts: 19,445
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From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
What is your opinion of this one for a 383, 11-1 CR, alum heads 62cc, Edelbrock Air-Gap, Street Avenger 780cfm, headers and 2.5" exhaust. Manual 5 or 6 spd and 4.11 rear?
Txs
Bman
Last edited by bmans vette; May 14, 2010 at 04:25 PM. Reason: name
Team Owner
Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
The dynamic compression ratio really comes into play when you have big flowing heads and cam timing that fill the cylinders. I'm talking about roller cams. They do such a good job of filling the cylinders that detonation is a problem. you can't compare a late model injected computer comtrolled roller engine to our old non-knock sensored 383 build. You do not have the computer retarding your timing in .5 milisec and richening the A/F
Drifting
Joined: Aug 2005
Posts: 1,682
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From: League City TX
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Le Mans Master
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From: Graceland in a Not Correctly Restored Stingray
As for which brand, I've used a good deal of Comp and Lunati product over the years (not just because I'm located only minutes away from both) and I've never had a quality issue either, but IMCO you really need to stick fairly close to the installed spring pressure and spring rate recommended by whatever manufacturer designs a cam you are going to plug in.
FWIW, I somewhat agree with Scott's comment, as I'm not a fan of tight LSA's unless a specific purpose dedicated build actually calls for it, and IMHO few, if any, street engines do so. Then again, I don't know everything about your application...
FWIW, I somewhat agree with Scott's comment, as I'm not a fan of tight LSA's unless a specific purpose dedicated build actually calls for it, and IMHO few, if any, street engines do so. Then again, I don't know everything about your application...
Thread Starter
Race Director
Joined: Nov 2006
Posts: 19,445
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From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
Thats interesting. On Comps online store they list them as 372 lbs/in http://www.compperformancegroupstore...egory_Code=BEE
I noticed that the max lift is different also.
Txs
Bman
Thread Starter
Race Director
Joined: Nov 2006
Posts: 19,445
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From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
Thread Starter
Race Director
Joined: Nov 2006
Posts: 19,445
Likes: 349
From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
As for which brand, I've used a good deal of Comp and Lunati product over the years (not just because I'm located only minutes away from both) and I've never had a quality issue either, but IMCO you really need to stick fairly close to the installed spring pressure and spring rate recommended by whatever manufacturer designs a cam you are going to plug in.
FWIW, I somewhat agree with Scott's comment, as I'm not a fan of tight LSA's unless a specific purpose dedicated build actually calls for it, and IMHO few, if any, street engines do so. Then again, I don't know everything about your application...
FWIW, I somewhat agree with Scott's comment, as I'm not a fan of tight LSA's unless a specific purpose dedicated build actually calls for it, and IMHO few, if any, street engines do so. Then again, I don't know everything about your application...
The build is for street machine primarily.
Additional info - totally forged bottom with 6.0" rods and SRP pistons flat tops with 4cc and .041 MLS head gasket. 4 bolt main and ARP studs both on heads and mains.
Already have retrofit hyd rollers by Comp and cam. Can easily swap out cam at this point.
Suggestions for other retro-fit cam for this usage?
Have not assembled heads as Springs / matching cam is the final piece of the puzzle.
Txs to all for your input.
Bman
