Mgb gear ratios. 7:1 or 3. The other option would be...

Mgb gear ratios. 7:1 or 3. The other option would be to install a higher Diff. So rotate the wheel two turns while counting the rotations of the propshaft. 974 First: 3. . And vice versa for lower ratios. 300:1 final drive. I have a 79 mgb with overdrive that I drive everyday as my daily driver to and from work about 70 miles round trip, mostly high way (70-75 mph). 07. Engine Prefix: 18G- 18GA 18GB on Ratios: 3sp sync, 4sp sync, B-W auto Overdrive (where fitted): 0. When driving I see around 3,000 rpm’s at approximately 60 miles per hour. I like something between a 3. The transmission used in this conversion is from a Datsun 280Z. This article is part of a set of FIVE! If you enjoyed this article, check out: MGB GT V8 Press Release - Introduction MGB GT V8 Press Release - "Description of the Car" MGB GT V8 Press Release - "Development of the Body and the Engine" MGB GT V8 Press Release - "Grandest Tourer - Latest of a Line" I've been considering the maximum practical net gear ratio increase that could be implemented through tyre size change and final drive gear ratios available from the Ford Sierra stable. 317" I'm aware calculating the perfect combination is a complex and lengthy process, but I'm hoping someone out there will have used this set up befor Measuring calipers, a dial indicator and most importantly a case spreader to properly load up the ring gear bearings. CO2, emissions, per It effectively provides a six-speed transmission with the overdrive/third gear ratio sitting usefully between direct third and direct top. -- It is helpful if you have completed GT-101, as the close ratio gearbox is very similar to the standard ratio gearbox, the primary difference being the number of teeth on each gear. 07:1 is higher gearing than 3. 3. 07:1 (vs. The 15" wheels make the ratio even taller than on an MGB. From 1974-1/2 through 1980 (all "rubber bumper" cars) it was changed to 1000 TPM. Therefore, I am looking at the option of changing the rear crown wheel and pinion ratio on my banjo axle to increase the speed for the same RPM. This in my opinion is ideal as 22 mph per 1000 rpm is high enough to give the economy and quietness, yet the engine still has enough torque to pull the ratio. Although prominent on the MGB, initially as an option and later as standard (on right-hand-drive cars fmm 1976), other MG models can be converted to overdrive. MGB Non O/D Trans Of note is the fact that 5th gear ratio is virtually identical to the OD 4th of the standard MGB box. 909:1 optional and rare when new, but now more A large gear driving a smaller gear results in a speed increase. 07 The MGB GT V8 got a 3. I believe the gears in the differential are 3. 98:1 The conversion is totally non-intrusive to the MGB. My apologies if this subject has been raised before - but I need some advice. Google suppliers for case spreaders. Overdrive on top gear. You'll have to find one from an MGB Banjo axle car (1967 or earlier). 5 rover unit so I don't wan't to over gear it and lose the acceleration . How many of you would be interested in straight cut close ratio gears for a MGA/MGB? The ratios would be the ones that BMC offered back in the day. MG MGB Technical Diff Ratios BBS discussion MG MGB Technical Diff Ratios BBS discussion at MG-Cars. I finally changed it to 3. Ratios: Overdrive: 0. 909:1 for your MGB axle) so that's the easiest gear swap. It was offered with or without overdrive in the UK/USA but only without in Australia . 820 Top: 1. 3-Synch_or_4-synch? 5-Speed_Conversion Automatic Bell-housing_Bolts Breather Drive_Flange Clutch_Pilot_Bush Gear_Lever Gearbox_Removal How_It_Works Interlocking_Arm_Assembly Internals Lubricants Mounts_and_Crossmember Oil_Change Overdrive Rear_Seal Reversing_Light_Switch Speedometers V8_Gearbox Torque_Values Links Gasket sealants - don't use silicone-based as they 'go off' very quickly and on This spreadsheet based calculator allows you to calculate overdrive ratios, view various difference between two tire sizes, calculate your RPM given a speed, calculate your speed given an RPM and find out how much your speedo would be off if you changed tire sizes. Good luck finding one in the US, rarer than undamaged over riders. 9:1. I've been thinking about changing the ring and pinion to a 3. Made between 1962 and 1980. 819 Grade of oil: SAE 90 Capacity: 6 pints Much chat about OD's, 5 speed boxes, mods etc, but has anyone achieved near enough to the same result (rpm reduction) by changing their diff? If so, are details and parts available please? The MGB gearbox seems to be an industrial bit of kit and well tuned I'm sure the engine The gear ratio is stamped on the top of the aluminium pumpkin. Edited 2 time (s). 23 or a 3. What is the gear ratio difference between a normal transmission and one with overdrive? Is the ratio the same in 3rd and 4th on both. at The MG Experience Hello, My MGB has only 4 speeds and at 55 ml/hr the engine rev at 3000 RPM. MG MGB Technical - Gearbox ratios This thread was discussed between 29/04/2010 and 06/05/2010 Is there any source of gear sets to change the standard 11/43 (3. My question is; Will this gearset be ok for my FIA race car appendix That flywheel can be used to install a 5-main bearing engine in the MGA. 31 and 3. If so is the overdrive additon just really a 5th gear that some don MGBs were all 3. Library Article: Stock performance numbers (BHP, Torque, etc) for each year of the MGB. 5:1 ratio depending on the gearbox, the engine, the cam and the weight of the car and yada yada yada With the diff I chose, I could easily go with a 3. The MGC ratio was 3. 556:1 commonly used with close ratio gearbox for competition. Borg Warner 35 automatic gearbox was also available 1967 to 1973. 909:1 in 2002, shortly after uprating the engine a bit, as it would then Sep 6, 2010 · Simplified MGB gear ratio chart Simplified MGB gear ratio chart Started by mgb260, September 06, 2010, 11:23:36 PM Previous topic - Next topic The gearboxes used on Australian-assembled MGBs went through three distinct variations (this would have been four if the assembly had continued past 1972) The first combination was the 3 bearing engine, with no synchromesh on 1st gear (1963-64). 300:1 for 1500 and 1600 cars 10/41 = 4. The original pattern close ratio gear set is, however, well worth fitting to the MGA or MGB - it raises first, and second ratios a fair amount and third a little, which gives an ideal spacing A technical explanation of how to fit an MGA/MGB Crown Wheel and Pinion to an MG T final drive to make T-series cars more driveable on modern roads. Gearbox Four speed manual, synchromesh on top three ratios to 1965, all synchro after. It's at 3500 rpm almost constantly, roughly 75 mph. Quote: When you rotate the free wheel, the ring gear will rotate at half speed because of action of the differential gears. 5". The only difference in the case is (??? from memory)the bracket that the ebrake cable bolts to is a little different. 10/43 = 4. This page lists MG MGB technical specifications. Last edit at 2023-03-02 10:01 AM by lakesailor. I have a set of 1. The hubs ,backing plates,and case are different. Become a Supporting Member to hide the ad above & support a small business A 3. at The MG Experience. 2 and a 3. 259 Second: 1. "How much rpm drop can I expect, especially on the highway in 4th?" Gear ratios are in the front of the workshop manual. 138 Reverse: 2. The OP is concerned about his final drive ratio. A speed reduction has a ratio greater than 1, and a speed increase has a ratio less than 1. 90. 7. A large gear driving a smaller gear results in a speed increase. All USA spec MGB's from 1968 through 1974 used 1280 TPM transmissions and speedometers. 300/1 Original ratio for For instance in theory you should get increased clutch slippage from a stop, experience slower acceleration, feel less power, and get less of whatever else logic dictates when you change to a smaller number gear ratio like a 3. Gearbox Four speed manual, synchromesh on all gears. The change of speed is a ratio commonly represented by a fraction using the numbers of the teeth on each gear, putting the driven gear number on top and the driving gear number on bottom. net mg axle ratios by greenmachine » Mon Dec 17, 2007 1:54 pm I need to change the ratio of my standard MGB axle for ether the MGC or the MGB V8 gearing ,my engine is a mildly tuned 3. 7, 3. What concerns us here, are the basic grouping of the four different transmissions used (two are non-synchro first gear, two are all synchro transmissions). 42:1. Does anyone know if there is a higher ratio gear set that will fit the early differential. they are in excellent condition. I own a 1970 MGB Roadster without overdrive. One advantage of this 5 speed conversion is the better spaced intermediate ratios. many, many cars later I bought an MGB. 90 ratio from an MGB will make it more of a cruiser. The MGC was available with three higher ratios which juggled around depending on year and Auto vs OD. 308:1 RATIO Final Drive RA-202 - REASONS to CHANGE the FINAL DRIVE RATIO RA-202A - os - MGA DIFFERENTIAL SWAP for changing FINAL DRIVE RATIO RA-202B - New RING AND PINION GEARS RA-203 - MGB REAR AXLE installation in the MGA Library Article: An easy to read table of common MGB specifications for model years 1965-1970. RA-201 - Various FINAL DRIVE RATIOS which can be fitted to the MGA rear axle RA-201A - Rare 3. 802, 0. The close ratio gearbox was a factory option for the MGA, available on Twin Cam from April 1959 and also on pushrod-engined cars thereafter, but One of the cool things about that worksheet is you can alter the gear ratios along with tire size to calculate actual speed at a given rpm or actual rpm at a given speed. 100:1 for 1600-MK-II 9/41 = 4. (Note: A higher ratio is one which makes the car go faster at any given engine speed, so a higher ratio has a numerically lower number of diff ratio, for example 3. 000, 1. MGA NUMBERS TECH -- BUY-101K Differential Gear Ratio Final drive ratio stamped on differential housing The final drive ratio is stamped on the front of the differential housing near the top bolts. 9-1. Is it possible to put different gears in the differential to lower my rpm’s? I was thinking somewhere around 3 With the exception of the non-synchro first gear transmissions, there is no functional difference between a speedometer for an OD equipped car and a non-OD one. Hi all, I'm building a new engine for my '68 MGB GT. Summit Racing is a good source for shims. Electrical overdrive optional, standard from 1975. MGB shims are not available but Dana 40 shims work for the Pinion depth and GM 3. Recommendations Parts MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo. Reasons to Change the Final Drive Ratio - RA-202 At 11:32 AM 4/4/05 -0600, Dick Horn wrote: "A club member has an MGB axle I can get cheap, real cheap, if you know what I mean!" Hey, that's my kind of buy. 3:1 ratio and was curious if any One of the cool things about that worksheet is you can alter the gear ratios along with tire size to calculate actual speed at a given rpm or actual rpm at a given speed. I have found an original BMC / leyland special tuning close ratio gears for a 3 synchro gearbox. I have not checked but I'm sure that it is the stock ratio is 3. He wants to know if two transmissons were made for our MGB. Hi All, I'm doing some market research here. 000 Third: 1. One of the cool things about that worksheet is you can alter the gear ratios along with tire size to calculate actual speed at a given rpm or actual rpm at a given speed. Page 1 2 Topic List Forum List Newer Older Start New Topic Kit converts the 1968-1980 MGB to a quiet, durable, all synchronized, overdrive 5 speed transmission. ratio. According to the laws of math, if my tach (with it's ever so steady needle) is correct, then I've got a 5. My cams peak lift is 0. MGB Production Data For a more complete description of the VIN plate found on the dash and the engine number, and the meaning of the letters in those numbers, please read the MGB VIN FAQ article in the MG Experience Tech Library. (Unless you fit a 5 speed in which case 5th could be an overdrive gear). 31:1 ratio that will fit standard MGB 1968 to 1980 tube axle style carrier. 625 Harland Sharp rockers. 3 rear end - which I know is proposterous. The overdrive option (which was offered in Australia late 1967 The hubby has a question finally. 00-1. CHOOSING GEAR RATIOS For Best Performance - CF-301 On 16 December 2009, Juan Gil Gutierrez in France wrote: >>"As I had a 4. 07 No difference between 4 speed and OD in the MGB. The MGB became the world's favourite sports car and makes a great classic car. 33 Mar 1, 2023 · That relates to the output ratio of the gearbox. Most people who do V8 conversions end up swapping out the rear axle MGA Final Drive Ratios - RA-201 This is a list of final drive ratios which were available in various cars that will fit in the MGA (and early MGB) banjo type rear axle. My MGA ran the first 315,000 miles with 4. Many of the internal parts of the early MGB gearbox are the same as the MGA parts, everything between front and center main bearings and the laygear (and the MGB gearbox may be easier to find if you need some good used replacement parts for the MGA). Engine, horsepower, torque, dimensions and mechanical details for the 1978 MG MGB. ) Here’s how to check out your diff ratio easily if you need to: Jack up one of the rear wheels (doesn’t matter Here are two ratios that you cannot go for but just as an idea- I have swapped my MGB rear for a GM 7. 3 ratio in my differential, the original one, I though that the 'always running short' feeling was due to it". All MG MGB phase-IV Roadster (rubber bumper) versions offered for the year 1977 with complete specs, performance and technical data in the catalogue of cars. Original ratio for the 1500/1600 cars is 4. MGB O/D Transmissions Ratios unchanged from 18GF engine to end of production Rather than hijack that thread I thought I would take this opportunity to ask a question that has been rolling around in my head for a long time and that is "Could a change of rear end ratio to higher gear (numerically lower) in conjunction with the stock trans come close to the same effect as adding an overdrive gear of either type?" Various alternative gear ratios can be provided including a closer ratio gearbox and a standard ratio gearbox with a higher first gear ratio of 2. 11/43 = 3. 25 rear end shims (and other American cars) work for ring gear shimming. MGA CLOSE RATIO GEARBOX - GT-102 Subject: Close Ratio gearbox. MGA Final Drive Ratios - RA-201 This is a list of final drive ratios which were available in various cars that will fit in the MGA (and early MGB) banjo type rear axle. Always the same for a 4 speed box as it is direct drive. 9 except the automatic which was 3. 1978 MG MGB technical specifications and data. Steve Gear ratios, rpm and mph. 909:1) rear end to 14/43 or 13/43? When you get to a fork in the road, take it. . This Ring (crown wheel) and Pinion set that is for MGB tube axle (1968 to 1980), made with a modern Oerlikon gear cut 3. They are available new for a big price but you can probably find a used R&P and After all, the MGB had an effective life span of 18 years and had numerous design changes during production. Thanks MGA/MGB early 3 synchro straight-cut close ratio gear sets - IN STOCK Here are six steps that will let you get more modern power out of an old school MG MGB. I was told that the standard ratio was 3 However, as always, time was catching up with the MGB and what were seen as quirks back in 1962 – such as the oddly-spaced gear ratios, non-sychromesh first gear and optional interior heater – were being viewed as seriously irksome by 1966. My experience from driving my standard 'B'-series type engine car is that the car is under-geared for touring or even spirited driving. qc27h, shxz4, uwsofd, 6pev, jpx30, j72nv, glegf, vj8r, zuxty, sxurz,