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#1 |
It's a lot like a race car
Join Date: Aug 2000
Location: Meridian, MS
Posts: 4,130
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![]() Ok, I am having a dissagrement with a guy at school. He says you can get a 302 to wrap 10K for about 5K if you do the work. I say this it BS.
So my question is....What would it take and how much would it cost to get a 302 to rev realiably up to 10,000rpms?
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1987 Buick T-type 1998 HD Electra Elide |
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#2 |
Moderator
Join Date: Mar 2001
Location: Myrtle Beach SC
Posts: 1,643
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![]() I think it would eat 5k up. Maybe not alot over but it would be closei think. First off good heads, no great heads. Extremely light rotating assembly - billet crank, aluminum rods and forged pistons. Must have a good cam( no idea on specs for that bad boy) I seen one 306 turn 9500 and it was a screaming little bit*&. It was wound about as tight as I'd want to wind one. It had all of the above, a girdle, and was built to the "T" if you will. No idea how much was invested though. I'd say it could be done for 5K if you had access to the machines to do the block yourself. A larger bore nad shorter stroke would also come into play. Makes torque and can be turned higher. Still wouldn't be easy to turn 10k.
Brad
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1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5. Built Ford Tough Moderator |
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#3 |
Registered Member
Join Date: Nov 2001
Location: SanAntonio, Tx
Posts: 734
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![]() It would take a miracle, after blowing about 4k on the bottom end, you would need another 3-4 k, probaly, "just guessing" to strenghten the valvtrain, hydralic lifters would be out of the question, as the hydraulic cam would probaly melt, and the oiling system would have to be a nascar like design, however that would work? the guys in the hot street classes see 9k rpms i believe, and im willing to bet they sink over 10-20 k in a motor, but im no expert, lemme know if you can build a monster like that for 5k, i would love to see how many times it would actually see 10k rpms, maybe one pass
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Police package 5spd 90 Lx, Stock original motor, 3.27grs, BM fan, fms 10.5 clutch, D&D quadrant, and adjuster, ADS chip, 180 stat, mac cai, mac h-pipe, mac subframe connectors, ASP crank pulley, ripper shifter, 26x10.5 M/T sport pros welds. 246 hp according to analyzer ![]() Race weight: 3,120 E.t-13.57 with 26x10.50's e.t. streets. 1.88 60' mph- 99.92 mph |
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#4 |
Registered Member
Join Date: Apr 2001
Location: draper,va,us
Posts: 206
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![]() get a 302 cc crotch rocket
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1998 mustang gt/manual..373s,bbk offroad h pipe,flowmaster cat back,c&l 80 mm maf,steeda triax,eibach springs,steeda ud pulleys,upr timing adjuster,screamon demos coil packs,motorsports 9mm plug wires,steea aluminum lca's,steeda heavy duty uca's and just over 100 k on the clock |
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#5 |
Resident Redneck
Join Date: Jan 2002
Location: Cecil County, MD
Posts: 165
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![]() I doubt it would take just 5000 grand. I think maybe for 10,000 an engine could be made to the right tolerances, but 5000 just doesn't seem like enough. People that have a sbf running 9000+ rpms have thousand in their engines. I know a guy that has over 25,000 in his engine to get it to turn those rpms. Hope this helps.
-Billy
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95' GT: 306, XL Ross Pistons, Ultra Lite H-beam Rods, Forged Scat Crank, 28oz Romac, 28oz JW flexplate, FTI ported RPM II intake, FTI ported AFR 165's, FTI custom cam, 75mm BBK Throttle body, 80mm Pro-M, 4800 PI stall, PA Super Comp AODE, Strange 33 spline race axles, Strange ultra lite spool, Motive lite 4.30's, Strange rear race brakes, Mega bite seniors, double adjustable uppers w/spherical bushings, Racecraft anti-roll bar, LPW rear end girdle, Metco d/s loop, A9L conversion, AFM PMS |
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#6 |
Registered Member
Join Date: Apr 2001
Location: Staging lane
Posts: 4,337
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![]() On horse power TV they had a 283 on there that would rev 10,000 rpms....That is the only V-8 that I know for a fact revs 10,000 rpms in a street car.
You maybe could build a 302 that could rev 10,000rpms for 5,000 bucks, I dont think that you would hit 10 grand very many times before you need a tow truck though. Technicaly he is right if you knew how to do all the work yourself you could build a 10,000 rpm 302 for 5,000 bucks. No way it would be reliable though.
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
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#7 |
Mustangs
Join Date: Jul 2000
Posts: 1,938
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![]() You would need some VERY lightweight and NEAR PERFECT machining and tolerances as well as very little imbalance to be able to rev a 302 that high "reliably". I suppose you could invest in a rotary valve cylinder head and get a well put together bottom end for around $5000 for just the main parts, but you'd have to machine and balance everything yourself. Chances are unless you get parts for free, you'd go over the 5,000 dollar budget pretty quick. There's alot of inertia and rotating mass forces going on at 10,000 rpm. I can't see it being done for $5,000. Now 8,000 rpm possibly, but not 10,000
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2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem ![]() 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 ![]() 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock) |
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#8 |
Registered Member
Join Date: Apr 2001
Location: Bowling Green, KY
Posts: 95
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![]() Pretty much everybody that runs in Hot Street and I believe a few Pro-5.0 guys spin their motors PAST 10k rpm. I remember reading about a Hot Street Racer named Sam LaManna that shifted his car at about 10,500 rpm.
![]() I'm not sure what his setup was, but any engine component that moved would have to be the lightest on the market. Also, most of the hot street motors are 360-400 inch small-blocks, have C/R's around 15:1 or more,and heads that flow close to 400cfm. So it is definitely possible, if you want to spend the big bucks and change valve springs every month.
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'90 Black Notch: TFS TW heads, Stage 1 Cam, Street Intake, FMS 1.6 rockers, Kirban AFPR, 24# injectors, C&L 76mm MAF, 70mm Accufab TB/EGR, Tremec 3550, SPEC Stage 2 & Billet Flywheel, Alum DS, 4.10's w/ 31 Spline Eaton, Full MAC exhaust, etc. 286.7 RWHP @ 5100rpm, 313.7 TQ w/stock MAF, Inj, TB, and no tune Race weight : 3090 # w/ driver New Best - 12.82@107.9 w/1.74 60' |
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#9 |
Registered Member
Join Date: May 1999
Posts: 5,246
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![]() Boss 302 engine.
lightweight pistons aluminum rods crank work serious timing set ported boss 302 heads mondo springs, lightened valvetrain wicked cam I'd be willing to be that setup could see 10k. Probably over $5000 to build. |
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#10 |
Registered Member
Join Date: Apr 1999
Location: Hayes, Va, USA
Posts: 798
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![]() are you talking reliably for a long period of time?
If your talking about kissing 10k for a couple seconds, then Big carb Single plane intake Big headers big compression solid roller, small valves, heavy springs. stock recipocating assy. I've got a brand X motor that was low compression and basically the same as above. its seen 9,000 rpm + numerous times, a few seconds at the time.
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2002 5M GT (99% stock) 1991 5M LX (30% stock) patiently awaiting my satin silver 07 Mach 1, and don't forget the shaker |
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#11 |
Registered Member
Join Date: Nov 2001
Location: Sunny, Hot, Sebring, Florida
Posts: 725
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![]() A purpose built block, pneumatic valvetrain, titanium everywhere....you see where I'm going
Call Cosworth...there's run 14,500 rpm.
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Remember...2nd place is 1st place for losers! |
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#12 |
Registered Member
Join Date: Nov 2001
Location: SanAntonio, Tx
Posts: 734
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![]() My friend paid 5 k, for a built and installed 347 that he shifts at 7k, and it pulls all the way to 7 and makes power probaly higher, it's forged pistons, crank, 10:1, stage 3 tricks, sometimes open headers, vic jr intk,
just think, a little more compression, solid roller, and some invinsible head gasket and race gas, i could see how it could go 9500.
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Police package 5spd 90 Lx, Stock original motor, 3.27grs, BM fan, fms 10.5 clutch, D&D quadrant, and adjuster, ADS chip, 180 stat, mac cai, mac h-pipe, mac subframe connectors, ASP crank pulley, ripper shifter, 26x10.5 M/T sport pros welds. 246 hp according to analyzer ![]() Race weight: 3,120 E.t-13.57 with 26x10.50's e.t. streets. 1.88 60' mph- 99.92 mph |
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#13 |
Tubbed and Juiced
Join Date: Mar 2001
Location: Tulsa, Oklahoma
Posts: 1,861
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![]() A destroked 302 could turn 10,500. It would take alot of money. Coupe your talking a 2500 rpm difference, there is a huge difference between 7,000, and 9,500. Not saying it couldn't be done, if you wanted any kind of longevity it would take the big bucks $$$, My 383 will turn 7500, for how long? I personally don't want to find out. Peak hp is around 6500 at the moment with the current cam set-up.
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#14 |
Registered Member
Join Date: Nov 2001
Location: SanAntonio, Tx
Posts: 734
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![]() yea i know, but Im just saying it was installed, ready to run for that price, so built and installed yourself, i guess it could be done for around 5-8 k, how reliable is the big question? might be spending 5k every time you rebuild, which would probaly be frequent, and the poor tranny would have to be a piece of $$ work too.
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#15 |
Registered Member
Join Date: May 1999
Posts: 5,246
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![]() Wouldn't cost much of anything to destroke a 302. Just get a 289 crank.
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#16 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() There is a formula based on piston speed (and thus, stroke length), that determines an engines theoretical top speeds. It sheds some interesting light onto which engines would be better for high rpm modification. For example, all things being equal, a Chevy 327 has a max potential of 11,077 rpms, while a Pontiac 326's max is only 9600 rpms. Why is it that the Chevy has a max potential that is nearly 1500 rpm higher than that of another GM engine of virtually the same size? The stroke. The Pontiac 326 crank has a stroke that is 1/2" longer than the Chevy 327.
Using this formula and late 1980's parts, and classifying the engine as Stock (stock), Heavy Duty (stronger, factory parts), Built (mid budget aftermarket parts and machine work), and Race Only (the best parts and machine work available), the following are the theoretical limits for Ford engines: Engine / Stroke / Stock / Heavy Duty / Built / Race Only Small Block 289 ci / 2.870" / 7,317 rpms / 8,362 / 10,452 / 12,544 302 ci / 3.000" / 7,000 rpms / 8,000 / 10,000 / 12,000 351 ci / 3.500" / 6,000 rpms / 6,857 / 8,571 / 10,286 400 ci / 3.750" / 5,600 rpms / 6,400 / 8,000 / 9,600 Big Block 390 ci / 3.780" / 5,556 rpms / 6,349 / 7,937 / 9,524 427 ci / 3.780" / 5,556 rpms / 6,349 / 7,937 / 9,524 428 ci / 3.980" / 5,276 rpms / 6,030 / 7,538 / 9,045 429 ci / 3.590" / 5,850 rpms / 6,685 / 8,357 / 10,028 460 ci / 3.850" / 5,455 rpms / 6,234 / 7,792 / 9,351 Now, keep in mind that these numbers reflect the rpms at which the engine will hold together. For the actual max rpms, other factors need to be considered. This, however, is an excellent starting point for referencing an engines potential. Take care, -Chris
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Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
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#17 |
Registered Member
Join Date: May 2002
Location: New Jersey
Posts: 375
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![]() What exactly is this formula??? You said there was a formula, but you only gave us the results. I only ask because I'm an engineering student and would like to have a basic concept on this.
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'89 LX 5.0, off-road h pipe, flowmaster muffs, underdrive pulleys, rebuilt WC T-5, King Cobra Clutch, 65mm throttle body, Explorer Upper/GT40 lower, Lakewood Rear Lift Bars. 76mm C&L Mass air w/ inlet pipe, Twisted wedge heads w/ stage 2 port,polish, MAC equal length shorties, Billet AFPR, 255LPH fuel pump, fresh low end w/ 10.5:1 compression. If anyone ever wants to go to Raceway Park in Englishtown New Jersey, give me a shout. RICER HATERS CLUB MEMBER 87! www.ricehatersclub.com |
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#18 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() Piston speed, which is the speed at which the piston travels between BDC and TDC in each stroke, is the determining factor. A piston makes two full strokes, one up and one down, during each crankshaft revolution. Therefore, the mean piston speed in inches per minute would be two times the stroke in inches, times the crankshaft revolutions per minute (rpm). The result is divided by 12 to convert it to feet per minute (fpm). The formula is:
Piston Speed in fpm = 2 x stroke in inches x rpm / 12. By dividing the numerator and the denominator by 2, you can simplify that to: Piston Speed in fpm = stroke in inches x rpm / 6. With todays technologies, the following Piston Speeds are the widely accepted limits for the classes I listed: Stock: 3500 fpm Heavy Duty: 4000 fpm Built: 5000 fpm Race Only: 6000 fpm To determine the rev limits, the formula is: RPM = piston speed in fpm x 6 / stroke in inches. Thus, to determine an engines maximum potential rpm, based on piston speed, divide the following by an engines stroke: Stock: 21,000 H.D.: 24,000 Built: 30,000 Race: 36,000 This becomes interesting when you really stop and think about it. In a Ford 302 spinning at 7000 rpms, the piston travels from a dead stop to nearly 40 mph, and back to a dead stop, in only 3 inches!!! (to convert fpm to mph, multiply the fpm by .0113628) Did that help? Take care, -Chris
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Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
RED & WHITE! Last edited by PKRWUD; 05-08-2002 at 12:20 AM.. |
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#19 |
Registered Member
Join Date: May 2002
Location: New Jersey
Posts: 375
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![]() Thanks for the formula. I can now rest easy as an engineer.
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'89 LX 5.0, off-road h pipe, flowmaster muffs, underdrive pulleys, rebuilt WC T-5, King Cobra Clutch, 65mm throttle body, Explorer Upper/GT40 lower, Lakewood Rear Lift Bars. 76mm C&L Mass air w/ inlet pipe, Twisted wedge heads w/ stage 2 port,polish, MAC equal length shorties, Billet AFPR, 255LPH fuel pump, fresh low end w/ 10.5:1 compression. If anyone ever wants to go to Raceway Park in Englishtown New Jersey, give me a shout. RICER HATERS CLUB MEMBER 87! www.ricehatersclub.com |
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#20 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() ![]() Take care, -Chris
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Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local
RED & WHITE! |
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