Lobe separation for nitrous on custom grind Lunati - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-27-2008, 05:25 PM
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Lobe separation for nitrous on custom grind Lunati

I'm trying to determine what the difference is between a 110-112 separation, and what affect it would have on my motor. I'm not to familiar with a lot about cams but I have done a bit of research. I'm in the process of getting this http://www.lunaticamshafts.com/Produ...d=1984&gid=287
but With Small base and maybe a 112 separation, this is because the tech advice from lunati said he might go that but wasn't sure if it would make much of a difference with just a 150 shot. What do any of you pro's think about the difference between these two setups? a 110 or a 112 for a max of 150 shot.

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Old 06-27-2008, 05:49 PM
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Too small of a camshaft to get worked up on lobe sep. I think you will like the response on the street better with the 110 versus the 112, although the difference is slight. On 150 shot of nitrous not worth fretting over. Spend the time tuning the nitrous is better.

Last edited by Rick WI; 06-27-2008 at 05:58 PM.
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Old 06-27-2008, 06:14 PM
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that is what he said as well I think I'll stay with 110 if the resonse on the street was better than 112. Are there any other grind options that work well on steet motors? If I'm paying for a custom grind I want to get the most out of it I guess.
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Old 06-27-2008, 07:02 PM
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Quote:
Are there any other grind options that work well on steet motors? If I'm paying for a custom grind I want to get the most out of it I guess.
What other reason would you get a custom grind? If you are having a cam ground, there is certainly specific information that your cam grinder is going to need - whether they be a private outfit or one of the larger cam companies. If you had specifics for a custom, they would still have to be something the grinder would do, or advise against.
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Old 06-27-2008, 10:46 PM
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You can use a stock cam with a 150 shot and have descent results. OR you can use a slightly higher lift with a resonable duration and overlap and get a higher performance when you are not spraying and have virtually that same boost from your nitrous when you do spray. Contrary to some magazine articles you don't really benifit from special grind cams and pistons until you start into a 200+ hp shot.
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Old 06-27-2008, 11:03 PM
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Contrary to some magazine articles you don't really benifit from special grind cams and pistons until you start into a 200+ hp shot.
Well, a lot could be said about no benefit from a custom grind. No one thing dictates the numbers. IMHO, custom cams, and pistons chosen as part of the whole engine-lada - including cylinder heads (runner size, chamber + efficiency, CSA) and intake can make a world of difference, nitrous or no nitrous.
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Old 06-27-2008, 11:24 PM
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Not sure if spending money to get a special grind for only a 150 shot is worth it, lots of better ways to spend that money that will actually make the car go faster.

You need to post more info on your motor to make any kind of recommendation on what you need, from your post it sounds basically like a stock motor your spraying there.
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Old 06-28-2008, 01:03 AM
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I have to go with a custom grind because of the clearance for H beam rods. There isn't anything stock about the motor except for the block, really I think.

400 SBC .30 bore
4.125 KB -22cc d-dish Hyper Pistons
GM Aluminum heads 58cc chambers 550 lift springs
bowls polished exhaust runners polished D-shaped exhaust ports all port matched
Hooker super Comp headers
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Still working on the Cam?
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Old 06-28-2008, 01:11 AM
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I have to go with a custom grind because of the clearance for H beam rods
You mean a small base circle?
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Old 06-28-2008, 01:14 AM
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yep, small base circle.
the only way lunati does it is by custom grind. Thay don't sell the voodoo line in small base but Ive come to like the cam and the way it sounds and the RPM range is on target.
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Old 06-28-2008, 11:11 AM
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I'd rethink the hyper pistons. They are brittle and any nitrous misfire/detonation might cause a failure.

You're spending a lot of money, don't skimp on the pistons in a nitrous engine.
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Old 06-28-2008, 11:36 PM
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F-bird I like the cam you mentioned but what do you think about my semi daily driver situation? I was going for a higher cam but the tech at lunati said a little less lift because of the whole 80% street use of this car. I will also have to recheck the coil bind and seat pressures to make sure my springs now will still work, I also think with that cam wouldn't my less than desirable 113 heads choke it up? These are the only reasons that I sordof cammed down a little? You opinion is respected thank you
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Old 06-29-2008, 04:00 PM
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Thanks for the help, I have been working on the heads for about 2 weeks I should be able to post pics when I go to the shop on tue or wed( I live an hour from the shop that I'm doing all my work out of). I have an old article from car craft I think that goes in the specifics on where to port these plus I have the added advantage of a cylinder head machine shop that a friend of mine owns not for from the shop I will have to discuss this cam with my buddy who is building this with me Kinda as my coach he has 35+ years on me building motors. I like what you say now I have to see how doable it is? I see what your saying about don't cam it down, but I still don't want a crazy motor that idles like a top-fuel dragster. I think it could work, I'm trying to still understand all the cam terms and functions. Again thank you for your help your always very informative
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