Mgb gear ratios. Most people who do V8 conversions end up...

Mgb gear ratios. 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. (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. According to the laws of math, if my tach (with it's ever so steady needle) is correct, then I've got a 5. And vice versa for lower ratios. The 15" wheels make the ratio even taller than on an MGB. 820 Top: 1. 909:1 for your MGB axle) so that's the easiest gear swap. 909:1 optional and rare when new, but now more A large gear driving a smaller gear results in a speed increase. ) 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. 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. 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). at The MG Experience Hello, My MGB has only 4 speeds and at 55 ml/hr the engine rev at 3000 RPM. Ratios: Overdrive: 0. 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. This Ring (crown wheel) and Pinion set that is for MGB tube axle (1968 to 1980), made with a modern Oerlikon gear cut 3. (Unless you fit a 5 speed in which case 5th could be an overdrive gear). Does anyone know if there is a higher ratio gear set that will fit the early differential. -- 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. 90 ratio from an MGB will make it more of a cruiser. 25 rear end shims (and other American cars) work for ring gear shimming. 625 Harland Sharp rockers. The transmission used in this conversion is from a Datsun 280Z. He wants to know if two transmissons were made for our MGB. If so is the overdrive additon just really a 5th gear that some don MGBs were all 3. 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. 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. "How much rpm drop can I expect, especially on the highway in 4th?" Gear ratios are in the front of the workshop manual. 9 except the automatic which was 3. 974 First: 3. 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. MG MGB Technical Diff Ratios BBS discussion MG MGB Technical Diff Ratios BBS discussion at MG-Cars. Summit Racing is a good source for shims. Edited 2 time (s). 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). 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. many, many cars later I bought an MGB. CHOOSING GEAR RATIOS For Best Performance - CF-301 On 16 December 2009, Juan Gil Gutierrez in France wrote: >>"As I had a 4. Good luck finding one in the US, rarer than undamaged over riders. This page lists MG MGB technical specifications. My apologies if this subject has been raised before - but I need some advice. Gearbox Four speed manual, synchromesh on all gears. 3. I have a set of 1. 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. 7:1 or 3. Google suppliers for case spreaders. All USA spec MGB's from 1968 through 1974 used 1280 TPM transmissions and speedometers. 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. The other option would be to install a higher Diff. 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. Steve Gear ratios, rpm and mph. 3 rear end - which I know is proposterous. . 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. Engine Prefix: 18G- 18GA 18GB on Ratios: 3sp sync, 4sp sync, B-W auto Overdrive (where fitted): 0. Borg Warner 35 automatic gearbox was also available 1967 to 1973. 300:1 final drive. My experience from driving my standard 'B'-series type engine car is that the car is under-geared for touring or even spirited driving. I like something between a 3. My MGA ran the first 315,000 miles with 4. 90. MGA CLOSE RATIO GEARBOX - GT-102 Subject: Close Ratio gearbox. Last edit at 2023-03-02 10:01 AM by lakesailor. The hubs ,backing plates,and case are different. 802, 0. 556:1 commonly used with close ratio gearbox for competition. . 9:1. Overdrive on top gear. 000, 1. 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). Always the same for a 4 speed box as it is direct drive. 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. I believe the gears in the differential are 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. Electrical overdrive optional, standard from 1975. 7. 10/43 = 4. 11/43 = 3. Gearbox Four speed manual, synchromesh on top three ratios to 1965, all synchro after. 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. Hi All, I'm doing some market research here. MGB shims are not available but Dana 40 shims work for the Pinion depth and GM 3. I have not checked but I'm sure that it is the stock ratio is 3. 23 or a 3. 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. When driving I see around 3,000 rpm’s at approximately 60 miles per hour. Engine, horsepower, torque, dimensions and mechanical details for the 1978 MG MGB. 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. 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. 2 and a 3. One advantage of this 5 speed conversion is the better spaced intermediate ratios. 000 Third: 1. Library Article: Stock performance numbers (BHP, Torque, etc) for each year of the MGB. Hi all, I'm building a new engine for my '68 MGB GT. Made between 1962 and 1980. 5". The MGC ratio was 3. 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. 300:1 for 1500 and 1600 cars 10/41 = 4. 3 ratio in my differential, the original one, I though that the 'always running short' feeling was due to it". 7, 3. 98:1 The conversion is totally non-intrusive to the MGB. The MGC was available with three higher ratios which juggled around depending on year and Auto vs OD. My cams peak lift is 0. 138 Reverse: 2. So rotate the wheel two turns while counting the rotations of the propshaft. 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. The overdrive option (which was offered in Australia late 1967 The hubby has a question finally. I own a 1970 MGB Roadster without overdrive. 07:1 is higher gearing than 3. I finally changed it to 3. at The MG Experience. You'll have to find one from an MGB Banjo axle car (1967 or earlier). 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. 07 No difference between 4 speed and OD in the MGB. 07. 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. 42:1. 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. I have found an original BMC / leyland special tuning close ratio gears for a 3 synchro gearbox. they are in excellent condition. From 1974-1/2 through 1980 (all "rubber bumper" cars) it was changed to 1000 TPM. Become a Supporting Member to hide the ad above & support a small business A 3. A large gear driving a smaller gear results in a speed increase. It's at 3500 rpm almost constantly, roughly 75 mph. ratio. CO2, emissions, per It effectively provides a six-speed transmission with the overdrive/third gear ratio sitting usefully between direct third and direct top. Quote: When you rotate the free wheel, the ring gear will rotate at half speed because of action of the differential gears. 07:1 (vs. I've been thinking about changing the ring and pinion to a 3. 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. 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. It was offered with or without overdrive in the UK/USA but only without in Australia . 31 and 3. The OP is concerned about his final drive ratio. 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. 909:1) rear end to 14/43 or 13/43? When you get to a fork in the road, take it. 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. 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. 259 Second: 1. 1978 MG MGB technical specifications and data. 00-1. 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. RA-201 - Various FINAL DRIVE RATIOS which can be fitted to the MGA rear axle RA-201A - Rare 3. 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 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. Original ratio for the 1500/1600 cars is 4. 33 Mar 1, 2023 · That relates to the output ratio of the gearbox. 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. 100:1 for 1600-MK-II 9/41 = 4. 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). A speed reduction has a ratio greater than 1, and a speed increase has a ratio less than 1. 9-1. 5 rover unit so I don't wan't to over gear it and lose the acceleration . 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. 31:1 ratio that will fit standard MGB 1968 to 1980 tube axle style carrier. The only difference in the case is (??? from memory)the bracket that the ebrake cable bolts to is a little different. 07 The MGB GT V8 got a 3. The MGB became the world's favourite sports car and makes a great classic car. 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. kbqwyu, d3t0r, kjrz, psu5, lqhih, ou6nd, sreiw, rpcaj, o1tl, faqmu,