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DRR Pro |
Is there any ET advantage with a 55mm cam over a standard cam with same specs???? Thanks in advance Brian Mollison 2013 American Dragster 2020 Sumerduck Dragway VA Top ET Champion 2017 Sumerduck Top ET & SSS Track Champion 2017 MAC Top ET Track Champion 2009 Sumerduck Dragway Va Top ET & IHRA SSS Track Champion 2008 IHRA Division 1 Top ET Bracket Final Runner-up 2007 Colonial Beach Dragway Top ET Track Champion | ||
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DRR Trophy |
In theory....yes. Might be too small to accurately measure though. The bigger base circle you run, the more stable the valve train will be. Very important in high RPM applications such as pro stock engines. Not sure how big they are running these days? I know that just a year ago 75mm was pretty normal for them. | |||
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DRR Top Comp |
Larger cam core will not break as easy or flex as much. Not sure how much flex is a problem but I have seen cams break and that makes a mess. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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DRR Elite |
NO | |||
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DRR Pro |
No et change if specs are the same, but there are advantages. Already mentioned, more stable valve train. Bigger core allows for better lobe design. You can make the same power with a less aggressive lobe. Also as mentioned, less cam flex. That could be worth a little power depending on grind, spring pressures, and cylinder pressure...... But there really aren't any drawbacks to them except for initial cost..I went with a 55mm cam in my stuff since I was getting a new block anyway. My head guy wants to put one of Pat Musi's cams in my stuff next time around, and I'll just need to drill the oil feed holes and pull the roller bearins, install babbit...He runs a 60mm core in his smaller engines....cost for me is the same as the 55mm...... Mark Goulette Owner/Driver of the Livin' The Dream Racing dragster www.livinthedreamracing.com "Speed kills but it's better than going slow!" Authorized Amsoil Retailer | |||
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DRR Trophy |
To go along with the 55mm cam discussion, can you fit a 4.75 stroke crank in a 10.2 block and a 55mm cam core without the two touching? Or does it require a raised cam block or a 4.625 stroke in the standard cam location block? Nick Craig 1971 Camaro Split Bumper 376ci LS3 | |||
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DRR Sportsman |
You can, I wouldn't.
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DRR S/Pro |
So as with many questions like this the answer is it really depends on the combo. If you are using a mild cam profiler with matching low pressure springs then no you would not see any difference on your time slip however once to move up to your typical TD/TS cams that many run these days with lifts at 1" or higher and spring pressures over 400 on the seat, you could, you would certainly see it on the dyno! Just changing push rods from 7/16", .185" to 1/2 or 5/8 is worth 10 to 15 HP, and that's with a raised cam block. In the big picture though, it's not one little thing that makes that much of a difference but when you string them together, that's when you will see it! | |||
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DRR S/Pro |
Not without modifying a few rods! I think you can get a 53 mm cam to work in that combo though without touching the rods (Steel ones) | |||
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DRR Trophy |
Watch the video. It's only a couple mins. They have 6.700 rods standard journal rods for BBC. http://www.callies.com/catalog/product/ultra-xd/? | |||
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DRR Top Comp |
The answer is yes, bigger diameter cam cores have the latent potential for more engine output, in which torque and rpm are quantities of. hp = torque x rpm / 5252 | |||
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DRR Top Comp |
Latent potential for rpm is latent potential for torque is latent potential for engine output. This one is Loaded with latent potential for rpm. | |||
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DRR Top Comp |
Everywhere you look, the most basic drag racing fundamental is overlooked. rpm is the limiter. It's also what makes pushrod drag racing really interesting, at any level boundaries are tested. | |||
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DRR Sportsman |
Hence the reason I wouldn't.
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DRR Trophy |
The Callies XD rods have the clearance needed built into them. The video on the link I shared shows this. No need to grind the rods in this situation. | |||
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DRR S/Pro |
NOPE! They are just for SBC, not BBC's. | |||
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DRR Trophy |
Take your pick. H beam or I beam? | |||
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DRR Pro |
we do 54mm cams all the time , with Oliver rods , no grinding required .. | |||
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DRR S/Pro |
Paul, I would not put those POS rods in Ed's lawnmower ! And yes you can use a 53 mm cam with good rods in this combo. Oliver had a really good product, then something happened, all on their end! where they would come apart with real low run counts, under 300! for normal BBC combo's. (The caps failed) This was 5 or so years ago. They denied everything! Maybe it's been fixed but they along with their rods can take long walk on a short pier! | |||
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DRR Sportsman |
This is simple. The bigger the diameter of the cam, the quicker you can make the ramps, hence more lift under the curve. This will make more HP down low and mid range. However in a drag race application where we are WFO, and the RPM drop isn’t that great, the gain won’t be as much. If you were road racing and the RPM drop was bigger and happened more often, then more HP under the curve would help regain max RPM quicker and might be a good improvement. | |||
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