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Gary Sharapa has written that his Cobra with a Keith Craft 496 and a SOLID ROLLER cam made 523 rear wheel HP, 681 HP at the flywheel. http://clubcobra.com/forums/showthread.php?t=107770 What cam and heads does Dan have on his Kirkham? If the shop claims 550 rear wheel HP, then what the heck is in there? |
Take another look at Twin Turbo's U-Tube of his drag race in Medford, Oregon. NOTE that every run his opponent got the hole shot on him! That has also been my experience. And yet, in the end, Twin Tubo over took for the win. Running VERY LOW 10.03 and yet loosing the hole shot everytime? A classic Cobra conundrum.
http://www.youtube.com/watch?v=AQtmrxaRVTg |
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Looks to me like he has a 510". |
Is the race decided by who gets the win light, or who posts the fastest time of the run? I might have missed this in the mountain of replies so far, but it seems to me that someone with little or no experience with staging and how the tree works could either:
Redlight (instant win to the opponent), or Wait for the lights to turn green, THEN start to accelerate. This would give someone with more experience and a better reaction time a car length right from the start. Remember, the time that shows on the timeslip is the actual time from when you start to accelerate through to the finish. The reaction time isn't included in this time. I'd LOVE to hear the excuses if one guy runs a quicker time but gets to the end of the track second and loses the race because he was slower in the reaction time! |
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Never mind. |
I am curious on the weight question since I also dont know how much my glass csx weighs if Kirkham and or shelby in my case has a posted weight on their rollers. I know the weight of my engine and tranny but not the roller itself and I am curious how my glass csx compares weight wise to the alloy kirkham.
Ron |
Ron,
Here's an old thread. Tough to figure out, but near as I can figure, the Kirkham weighs about 2,150 lbs, with an all aluminum engine and the CSX is about 150 +/- lbs more with the same type of engine. http://www.clubcobra.com/forums/kirkham-motorsports/61878-shelby-vs-kirkham-aluminum.html FWIW, my Kirkham weighed in at 2,128 lbs. |
OK can the next piece of information leaked to everyone be what type of cam Dan's engine has?
Solid or hydraulic roller? If hydraulic, then the RPM's will be over by 6,200-ish. Solid roller on the other hand.... |
It's a KC motor, it's almost a sure bet he has a hydraulic roller. Which is great for maximum tire smoke at low rpm,,, if that's what you want. :)
It would also be unlikely a motor THAT big, 510 cid, would be a high rpm motor. I'm thinking, 6,000 max, 5,800 more reasonable. Quote:
Solid roller might be good for around 7,000. No way you would crank a 510 THAT high,,, would you? Man, that would be crazy! |
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You're kidding right? If you search the FE Forum you'll see big cubes and solid rollers: Here's a solid roller 511ci Shelby block engine by Barry R. making 787 HP at 7,000 RPM: http://www.network54.com/Forum/74182...dyno+pull+data Jay Brown from the FE Forum: "My 585" SOHC cheats this little recipe by using EFI, but it idles at around 750 RPM and runs on pump gas with 13:1 compression and 285 @ .050", with about .740" gross valve lift. Due to the differences in rocker ratio this duration at .050" is about equivalent to 273 @ .050" from a regular FE wedge cam. This engine peaks at 935 HP at 6600 RPM, but stays over 900 HP through 7500. So I think that your proposed engine would need more duration to peak around 7200 RPM in HP (although maybe not if you kept the cubes around 500). Head flow on my SOHC with the raised ports is around 450 @ .800" lift. Jay Brown 1969 R Code Mach 1, Drag Week 2005 Winner BB/NA with 511" FE(10.60s @ 129), Drag Week 2007 Runner Up BB/PA with 490" Supercharged FE (9.35 @ 151) 1964 Ford Galaxie, Drag Week 2009 Winner Modified NA with 585" SOHC (9.50s @ 143) 1968 Shelby GT 500 Convertible, 492" 667 HP FE 2005 Ford GT, 2006 Drag Week Winner, 12.0 Daily Driver 1969 Ford Galaxie XL, 460 (Ho Hum....)" Big cubes and high RPM's are more common than you think. FYI, my Crower billet hydraulic roller cam can rev to 6,200+, but max HP comes at 5,800 RPM if I remember correctly. |
Wow, I haven't understood any of the last 10 or so posts, which is all to the good. Great site to transfer technical information. I do know that the poll keeps getting closer and closer, ironically as it looks like Dan's car has more and more capacity.
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Nope, not kidding!! I didn't say you couldn't, but it aint normal by a long shot. Your taking a BIG risk slinging "heavy metal" 500 cid engines to 7,000 rpm. ANY such motor will be a seriously "race prepared", money is no object build.
You cite ONE (or two) examples of a BIG cube SOHC motor (not common) where the horse power peaked at 6,600 rpm. Still, pretty darn high for a big cube motor. There are no rpm's listed for the other, mostly DEDICATED drag race only examples of big cube motors. Would YOU turn a 510 cid motor to 7,000 rpm? Not likely any of us mere mortals will ever have a motor that big capable of that kind of rpm. WHO would build such a motor, that would acutally survive? It's a short list, put Barry R and KC on it. Would Blitz have such a motor?? Well hell yeah, Blitz might. :) :) Tommy, I frequent a few other technical forums, THIS forum is about as deep as any EVER get when it comes to technical stuff and serious gear head talk. You will see the best of the best when it comes to cars around these parts. ...a lot of these guys are way over my head! :) |
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Yes, I would build such an engine and I may one day. I have a Shelby block capable of 527ci reasonably easy. There are now a plethora of stroker engines and parts available today that weren't available just several years ago. But Chevys have been doing this for years and years. I had a 540ci engine in my old Vette over a decade ago that was shifted at 6,500+ RPM's a lot. I'll sling Dan's 510 at 6,000-7,000 RPM, but I don't think he'll let me. |
Aside from all the horsepower and engine spec talk, Tires, Track Temperature, and the ability to get traction off the line are going to be key factors for both cars, I would think.
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Well that's certainly true Duane, but that 3 second's to 60 mph shows some serious potential. Gotta wonder what kind of tires were in play when that time was recorded?
It sure would be nice if someone could give us a clue what kind of rpm this monster is capable of. Come on,,, just one little clue! :) |
From an old Otomix post:
"The elite Cobra to own, Professional built, advanced fit - finish - detail and (32k) 511 SHELBY Alum, 2 four tunnel port 720hp by KCP. 5 speed tremic, polished stainless side pipes, all Kirkham extras (non stainless chassis). 500 hrs polished body, many extras plus original 1960s amber Ray Dots, Billboards, fire system+polished bottle. And more, will offer to good home @ $110.000.00.." |
[quote=RodKnock;1109241]
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Fact is we don't know really a hellova about about Dans engine but it keeps coming out that he's got more than was originally described or what we thought, and that's a fact. Other than that, Dan will win at least one race and that's all he needs.;) IMHO. Pre-race hype and positioning to the contrary. John, AKA, tin-man |
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e.g. E, my thought is if the Cobra guy with say 600+hp runs the Billboard tires (I tried those at the strip twice - ugh, not great), and the Ferrari runs a modern street-race type tire, its going to make for two races in one; one race at the start and another race that will develop from the 3/4 point to the finish line. Do we know what rear tire type and size the Cobra owner is going to run for sure? >>> Spinnin' aint winnin! |
[quote=tin-man;1109405]
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I'll stay with my original vote for one of the most technologically advanced cars in the world, with launch control and F1-inspired transmission, but it's certainly getting closer. Solid roller cam or not? Inquiring minds want to know. |
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You can see that there are a lot of passionate and knowledgeable Cobra guys around here and the race between you and Blitz has certainly elicited a lot of interest and speculation. There are so many different factors involved that could tip the balance one way or another and engaging in 'bench racing' is a lot of fun. Hope the contest is as good as this thread ... and that you and Dan have a safe race. |
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