1979 pontiac 400 engine specs horsepowerespn conference usa football teams 2023

Torque: 320 lb-ft @ 2800 rpm, CHASSIS R.M. That's what the driver can feel all the time and what onlookers can imagine if the driver has any idea at all what the car is for and how to use it. The numbers Ive heard for the TH400 were more like 40 hp and the TH350 as 30-35, but yeah. R.M. (6,996 cc) L72 engine, officially known as a Turbo-Jet 427. By the mid-sixties, the advertised outputs of many bread-and-butter engines were still unrealistically high, but the outputs of Detroits most powerful engines were now as likely as not to be deliberately understated. The real decline wasnt quite as steep as it looked; the 1971 engine did have a lower compression ratio to prepare for the adoption of unleaded gasoline, but the 1971 gross rating was still 365 hp (272 kW), so the actual loss was about 10%, not more than 40%. Engines of that era generally were not very ambitious in terms of specific output. When asked the reason for the huge difference, gearheads tend to shake their heads and mutter about emissions controls and anemic, low-octane unleaded gasoline which is true, but only partly. Depending on the time period, model, and market, other European automakers might use either DIN or SAE gross figures. All four tires react in coordinated patterns, freeing you from the necessity of overseeing an unruly and domineering machine. If you go in too hot and lift, the tail won't come around unless you've been woefully ignorant. In the real world, automotive engines very rarely operate in ideal conditions. The LS7 will idle smoothly and pull from low engine speeds in a higher gear, which isnt something with which the L88 was designed to cope artfully. Well, if its any consolation, you werent the only one confused by it and your memory of what youd read was accurate its just that the contemporary articles were not necessarily correct on that matter. Cadillac issued both net and gross figures for 1972, which were 365 hp and 535 lb-ft SAE gross, 235 hp and 385 lb-ft SAE net. In some cases, the automatic version is tuned for a bit more power to account for the reduced efficiency of the automatic (that was common in the early 50s); in some cases, engines slated for automatic are de-tuned (or retuned in a way that sacrifices peak power for mid-range torque) either to mate better with the automatic or to not strain the automatics torque capacity. Pre 1972 engine was rated on a test stand, to mufflers, no accessories. The Ford 289 V-8 had a cylinder bore of 4.00 inches, which means its RAC horsepower racing was 51.2 (rounded down in most cases to 51). R.M. All I am going to say was that back in the Muscle Car Days of the late 60s and very early 70s I was there. Your email address will not be published. By the time Barrington finished squaring this block and making the holes round, the thought occurred to us that we had $800 invested. Between inflation and deliberate underrating, the relationship between advertised gross horsepower and actual net output was becoming increasingly nebulous by 1970. Ive come into possession of seven engines/blocks that are a mix of the Buick 215 and the Rover 3.5 liter. Why not? PLEASE DON'T SUBMIT COPYRIGHTED CONTENT YOU AREN'T AUTHORIZED TO USE! Does anyone really know how many horses the 350 rocket engine 4 barrel have? Length: 197.1 in I special ordered a 73 plain 2 door nova with sport suspension, power disc brake, and 3.42 rear diffentral. (This is not to be confused with engines of the 50s that did have slightly more power in automatic form to help account for the losses of early automatics. The PYPF cookie normally expires in approximately four weeks, the 01A1 cookie in approximately one year. General Motors designed the 403 to replace the big-block Olds 455, which GM decided had outlived its usefulness. To 220 net and with a 4 speed 1:1 is probably around (These cookies may not be set at all for administrative users unless they access the publicly visible portions of the website and/or update their consent settings e.g., by accepting an updated version of the Privacy Policy. Guy Radcliffe writer Apr 1, 2007 Building The W72 For Hot Street PerformanceI have a question about the W72 engine, which I want to modify for more power. (I wouldnt be able to say more precisely without seeing a net torque curve for the 283-4V, but thats probably a reasonable guess.) From the Archive: 1979 Pontiac Firebird Trans Am Road Test, From the Archive: Paris By Pontiac Trans Am, Tested: 1991 Volvo 940SE Is a Foul-Weather Friend, Your Privacy Choices: Opt Out of Sale/Targeted Ads. If one were to run aviation fuel at 100 octane the heat value would be closer to 125,000 BTUs/gal. As with many things, the answer is, It depends.. Without a supercharger, which in the mid-sixties had a rather low reputation, getting much beyond that tended to make an engine harder to live with: too much valve overlap and far too much carburetion to be happy in normal driving. In most cases, the engines were not actually altered in any significant way; the changes were in the test methodology. Again, it has no connection to developed output. I dont have camshaft, carburetion, or valve size specs, but obviously the 72 gave up something compared to the 71. My assumption is that Chevrolet was simply reluctant to surrender the familiar SS 396 nomenclature, even though the 396 cubic inch version was dropped or phased out. it did not make since. The limitation seemed to be valve lift, so we thought the simple addition of a set of 1.6:1 rocker arms might help. 1/4-Mile: 15.3 sec @ 97 mph100 mph: 16.9 sec once that tab was removed you had a fully functional 360hp gto engine in a firebird. Thanks. (6,488 cc) Turbo-Jet V8 as an option for Corvettes, rated at 425 gross horsepower (317 kW). Thank you very much for a very informative article. The 340 Mopar Cuda was faster than the 429 Boss Mustang on the street. Pontiac offered the new turbocharged 4.9-liter as an option in the Formula Firebird and Trans Am, coupled exclusively to a three-speed automatic and a relatively tall 3.08:1 final drive ratio . However, there are a great many engines that have exactly the same rated net output (whether SAE, DIN, JIS, or ISO) regardless of transmission choice. Width: 73.0 inHeight: 49.3 inCurb Weight: 3700 lb, C/D TEST RESULTS30 mph: 2.9 sec60 mph: 6.7 sec The screaming-chicken-emblazoned hood slopes forward into the drooping beak nose, and the air dam and the front tire spats have been reshaped for better integration with the schnoz. With modern tires Im sure theyd outrun anything built since thats naturally aspirated,at daytona they ran over 200 mph in the stock class, probably the last real race car you could buy from a new car dealer. Of course, you can easily determine whether your car has dual exhausts and a catalytic converter or not! Much more comfort to be had by those who want it. (I suppose technically you could pull the engine, make sure its in healthy stock condition, and run it through the appropriate test regimen on a dyno, but thats not exactly an easy weekend project!). Horsepower figures for the 403 were [email protected] rpm, good for a 5 hp bump over the Pontiac 400, yet netted five less Lb/ft of torque (320) at a peakier 2200 rpm. Your Cutlass Supreme presumably had the L33 (455/320 with duals), which had gross ratings of 320 hp @ 4,200 rpm and 500 lb-ft @ 2,400 rpm on 10.25:1 compression. 1517; Bernard Cahier, Road Test/10-63: Mercedes-Benz 230 SL, Sports Car Graphic May 1963, reprinted in Mercedes 230SL 250SL 280SL Ultimate Portfolio 1963-1971, pp. I have heard rumors that there could be as much as 100 horsepower lost from Gross to dyno. Either way, the 402 cubic inch engine was pretty clearly already a milder engine than its high-performance 396 cubic inch cousin, the use of a regular cast iron crank rather than the SS 396 engines forged steel crank being a particular giveaway in that regard. For more information about what data PayPal services collect and how that data may be used, visit the "Legal Agreements for PayPal Services" page to review the PayPal Privacy Statement and Statement on Cookies and Tracking Technologies that apply in your location (the Statement on Cookies and Tracking Technologies that applies to each region is linked from within the applicable PayPal Privacy Statement). Within a few years, of course, the various magazine writers had corrected their mistake, if only because of the early-70s fad for dyno-tuning: putting a car on a chassis dynamometer to optimize ignition timing and carburetion settings. What about the 5 liter Mustang of the late 80s, rated at 220 hp, based on the performance it is hard to believe it was less than half of the car of today? My own history, which Ive mentioned here and there, is hardly a secret, but less interesting than you might think. Wrap a Trans Am body around the WS6 suspension and brake pieces, and you discover maybe the best-handling production car ever from an American manufacturer. I read all of these posts and your comments back. The 1966 427 was offered in two forms: the L30, with hydraulic lifters, and the L72, with 11.0 compression and solid lifters. The torque figure was 230 lb-ft @ 6,000 rpm. Thank you Aaron for a well-researched article. The rockers alone were worth almost 20 hp, which helped us excel to 501 lb-ft of torque and upped peak power to 466 hp at 6,000 rpm, and the engine responded positively to nearly all the changes. We also verified a few details per the Wikipedia entry on horsepower (en.wikipedia.org/wiki/Horsepower). The Boss 429 was pretty explicitly a NASCAR engine it was only offered in the Mustang because Ford needed to sell the requisite number of engines (in anything) to meet NASCAR homologation requirements. What would be the Chevys net horsepower? Could I crank out the same rpm rating for a 1970 or 1971 402 with my thought process being that the critical internal components are equally as strong as a 1970 or 1971 402? 1985), pp. As a minor point, SAE is not synonymous with gross. Since 1971, the SAE has had standards for both gross and net output, although their methodology for the latter is not identical to DIN or JIS net ratings. If you delete or disable these cookies, your existing preferences will be lost and you may not be able to save your privacy settings for this website. It's a short-order specialist and it will feed a need. The engine is too big and too inefficient to make the government's Corporate Average Fuel Economy grade for GM, and it's out. This allows better volumetric efficiency (better breathing) in their engines and more horsepower. 30-33; and Mark Wans AutoZine (www.autozine.org). 25 hp difference is maybe worthwhile, since it would be part of an engine overhaul car restoration anyway. The failsafe point at which it begins to come unstuck is so high that, if something goes really wrong, the interest will compound very rapidly: the interest of the police, the interest of the doctors, the interest of the judge, the interest of the insurance company. So is there a consensus on what percentage of horsepower is lost between the Gross & at the rear wheels (dyno)? I am thinking about stroking the engine reasonably (block is good, just the oil rings are bad, etc), along with boring it just a little bit (.030) over, the new pistons, stronger cooling and oil pump, ported heads. By the way, ZL-1 engines were factory dynod at 525 hp with open headers. I was told several years back that the difference between gross horsepower and net horsepower was 37%. If we had a collective pinch of sense among us, we'd organize a cooperative fund and buy up all the 1979 Trans Ams we could lay our hands on, like maybe every one that comes off the line. 1992), pp. Especially in the era before variable valve timing and computer-controlled dual-runner intake manifolds, getting massive horsepower generally involved tuning for high-end breathing at the expense of low-speed and mid-range response (and vice versa). It was a reminder that engine commonality isnt always a benefit! Whether your vehicle is a GTO, Fire Bird, Trans Am, Lemans, or a timeless classic, here at Pro-formance Unlimited we are here to help design and build the engine combination that will match you with your vehicle. You say it is 25% which seems more credible. (We have now DISCONTINUED our use of Google Analytics tracking on this website; see the "Online Tracking" section of the Privacy Policy for more information.) For 1971, many U.S. manufacturers listed both SAE gross and net ratings (providing a sometimes illuminating comparison between the two) and then switched to net ratings exclusively for 1972 and beyond, even in states other than California. R.M. Loved both cars but think I was closer to the 1970 model. Been trying to figure out the Net ratings for Jaguar XK6 engined cars which was only rated in SAE, does any straightforward conversion formula exist to convert SAE to Net? And it is more comfy for high speed cruising and overtaking on Landstraen. Not driving even close to that regularly. So, the 1968 four-barrel engine probably has an edge of around 80 to 90 real horsepower over a 1973 400/2V. Obviously long tube headers, intake tweaks, and some aftermarket internals are also permitted. We'd talk about the wonderful thing Pontiac did for us when it brought something into the world that, indeed, runs as if there were no tomorrow. Clarke (Cobham, England: Brooklands Books Ltd., ca. (Im not talking about the desire to hang onto the SS 396 badges, which is easy to understand, but rather their decision not to dub the Turbo-Fire 400 the Turbo-Fire 401 and the Turbo-Jet 400 the Turbo-Jet 402.). My Camaro has a replaced engine and i am trying to find out what it is or what the hp is Gross vs nett. What Makes This 1949 Buick Sacramentos Best Custom of 2023? Thank you so much for writing this informed and literate article. However, if you were to take both cars to a drag strip and put them both through the standing quarter mile, I would expect the Lincoln to catch up with the Bel Air above 50 mph and then leave it behind, reflected in a significantly higher trap speed. Corners are where the WS6 option comes in. Do you have an idea what the gross HP or the ACTUAL net HP was for these engines in 72? 300 horsepower (L78) 400 engine (8.2 CR) 325 horsepower (L75) 455 engine (8.2 CR, D-Port) . Pontiac is playing its cards close, not telling just how many of its own 400-cubic-inch engines are on the shelf, ready to go into Trans Ams. They were certainly all 402 cu. The problem is that difference between gross ratings and as-installed power can vary enormously from engine to engine; there is no consistent formula for estimating the relationship between gross and as-installed output. Interestingly the follow notes the planned 3-litre XK6 was putting out around 185 hp and that it likely featured an alloy block or was basically a short-stroke version of the existing XK6 engine, with little to no indication of being related to the E2A prototype engine. Can see why Jaguar sought to replace the XK6 with the V12 and 60-degree V8 project even if they were better off making the latter a 90-degree V8. The Lincoln has more gears and a shorter first gear, but a taller axle ratio (3.07 was standard) and a big gap between first and second, which allows the engine to lose more RPM on the 1-2 shift and puts you in a thinner part of the torque curve. In as-installed net condition, its not uncommon for an engines power and torque peaks to be reduced somewhat, due to greater back pressure restriction or other breathing limitations. Im thinking about putting in a crate motor rather than building the original, numbers matching engine. All things being equal, a higher compression ratio engine will produce more HP for a given gallon of gasoline than a lower compression one. 118-121; Chevrolet Division of General Motors Corporation, Chevrolet 1950 Engineering Features: Passenger Cars (Detroit: General Motors Corporation, 1949); Lionel Deluy, Technologue: SAE What? Motor Trend, 15 October 2005, www.motortrend. So, the 1970 had something like 70 more net horsepower and probably more than 100 lb-ft more net torque than the 72. The car is equipped with the base engine for 1979 which was the Oldsmobile 403 cubic inch V8 engine that delivered 185 horsepower and 315 lb ft of torque. Kudos to you and your commitment at getting back to the questions asked. Also, I can get my hands on E85, or even some very cheap toluene illegally, but at half price from pump gas, since no road tax. The most common British versions, for instance, had either 135 or 155 PS DIN (133 or 153 net hp), but the early U.S. low-compression 2V engines had only 150155 GROSS horsepower, which was probably in the realm of 110 hp net. There are a bunch of different versions of that engine, in different states of tune, so it really depends on what pieces they have and how theyre set up compression ratio, carburetion/injection, cam, manifolding, and so forth.

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