4.6 Stage 3 MGB GT with a Brand new 5 speed gearbox conversion 

I'm not going to help here.....................WHAT, you sold it!!!! I'm sure there was a good reason at the time. You never know, you may be able to buy it back one day or build a better one

Thank you for your comment :-) Hope we have inspired many to do the same

@@RPIEngineering I'm sure you have, extra power, handling, refinement are always an inspiration. Of course, the cars themselves do a pretty good job too. Far more so now than when they were current I think

Instablaster...

@@baylordanny978 I'll take it over my 420HP 2013 Mustang 5.0 anyday. No comparison, fun wise. The Mustang does have A/C but that's on the wish list for the MG too.

Drop a 150hp engine in your Midget. Plenty of modern 4 cyl FI engines that will weigh less than the 1500 and have more go than any stock MGB. A Midget that will go 130 mph and blast by most anything on a mountain grade is a new world of fun. Lots of net info on engine upgrades for Midgets and Spitfires with that sad 1500. Go for it. 🙂

Yeah, the Rover K-series is a popular conversion in the UK. They aren't available here in the US. :-/

@@rizzlerazzleuno4733 Nooo drop a triumph rocket 3 motorcycle engine in it. Keep it nice and light.

Yes when setup and running well the 3.5 litre engine still has good power and flexibility

Thank you. We are very lucky to get such beautiful cars in our workshop.

Customers spec on this was keep it simple however EFi is possible and we have done them before. Overall power between a good carb setup and EFi setup should be much the same however EFI will always have more refined throttle feel etc.

RPIEngineering yes, and better fuel consumption and lower emissions.

Well, you a bit incorrect about the weight being a problem with the Rover V8. My 'B lost about 40 pounds over the front axle when the aluminum block replaced the old 1.8. Mine was also set with with Sebring kit, and recently sold on Bringatrailer. Mine frankly wasn't near as nice as this one, bringatrailer.com/listing/1963-mg-mgb-v-8-conversion/

Its not going to have that Classic V8 burble and bottom end torque that the V8 has though. Saw a SR20DET engine fitted in a MGB GT some time ago on the internet though and was certainly different

@@RPIEngineering A friend is installing a SR20 with 5 speed in a MG Midget. It also has a Corvette front suspension/steering and a Jag rear end. Gonna be awesome whenever it gets finished. 🤔

@@qqq854 Yep, just about any modern 4, 6, or 8 is going to be an improvement over the original 1.8. It is just astounding that there are so many 4s that have over 200 hp. All that being noted, it is fun to go to auto shows and see a completely original (or restored) MGB. The B is one of the cleanest sports cars designs, but with the bonnet closed who knows what could be hiding in there......that's why I don't like louvers or scoops.

@@rizzlerazzleuno4733 First engine I ever completely rebuilt and upgraded was an SR20DE lump, still love the SR engines but afraid the RB trumps it some what :-)

I'm not sure I could justify a "Ring" trip to customers under the scope of "testing" :-)

Thank you

Not from what we have experienced in 30+ years and real world road driving. Throttle response is greatly increased with vac advance on a timed port. When the MG R V8 went off to Japan they moved the vac advance to a non timed port and its a known correction to assist in getting the vehicles to drive better to place it back to the timed port where rover designed it to be (along with correct mapping etc as well) However I do see the logic behind your explanation with decaying vacuum under opening throttle however in the real world on a dizzy setup it just does not translate to throttle response and drivability for a road car.

@@RPIEngineering Please don't assume that I'm not driving in the 'real world'. There is no way that the throttle response can be 'greatly increased' by running off the timed port because by definition it won't have any effect at very small throttle openings. The only time you would see an improvement using this port would be if the vac canister was not well suited to the signal from the non-timed port of the carb, (which is very often the case with the 500 carb), in this case the fix would be to modify the canister or find a suitable one, not just plug it into the timed port. Until stupid emissions laws came into force all cars run vac advance on a non timed port, for example old Minis running A series engines are setup with around 6 degrees of timing at idle with the vac disconnected, the engine runs very poorly due to the retarded timing, you then plug the vac tube back in and the idle becomes stable because the canister has added around 14 degree more timing, the idle timing is now up around 20 degrees. Its the same thing with the Rover engine, just as a test set the timing to 10 degrees or even more if you wish, then with the engine running slowly add more timing, the engine will pick up speed because it wants more timing, from memory my 4.6 stage III needs about 24 degrees. Of course this would be way to much if you then floored the throttle because the VE would go up which means the initial cylinder pressure would go up, the result is that effectively the timing would be too advanced. (we are aiming for peak cylinder pressure after the plug fires to occur at around 14-20 degrees ATDC). I run around 32 degrees total timing so on the face of it it would seem that I only have an advance range of 8 degrees (32-24) but this is not the case because my vac system can back off the timing by 14 degrees, so if I floored the throttle at idle my timing would back of to 10 degrees (24-14). At the same time my all in timing when there is a high manifold vacuum is actually way more than 32, its 46 degrees (32+14). It is just about possible to setup a system with the above figures using bob weights and a vac canister although I have found that any of the standard canisters need opening up and modifying, i run a fully programable MSD 6530 ignition system with a modified (locked out Lucas dizzy, all the guts removed and a MSD pick fitted). It also runs a MAP system which allows me to setup the vac advance system. Even with in the limits of the standard ignition in conjunction with the 500 carb when I have modified such systems the driver says that the car now pulls in third in the same way that it did in second gear.

@@sidecarbod1441 We will have to agree to disagree. There is often more than one way to get to similar results. For us we have always seen great results as our customers have experienced, is seen in our videos and the tens of thousands of engines that we support remotely have reported back.

@@RPIEngineering Just try advancing the timing on an idling engine until you reach the point that the idle speed stops rising, then measure the timing, even on a bog stock 3.5 with a short duration cam it will be up at 14-16 degrees. This is telling you at with the throttle virtually closed the engine needs that amount of timing at idle, it will therefore need more timing as the revs rise assuming that the VE still remains very low. As to thousands of customers reporting back, well "in the land of the blind".....

Because the LT77's and even R380's although very strong most are badly worn now and parts for them are tricky to get. The Mazda box is a great little box thats brand new, it had a great feel on shifting gear where as the LT77's and R380's where always a little more agricultural :-) More explained in this video here ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fvTfL7Bh1RM.html

Hi, We cover that in this video about the gearbox ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HbVHST5qZ1I.html

Won't take the torque.

My brothers new 1971 or 1972 MGB and my used 1972 MGB were fine but it's a common issue due to the poor support structure from the hinges to the leading edge.

@I'LL BE BACK ! BS ! My 1964 B original aluminum hood/bonnet is a perfect fit and as new, never wrecked or modified, no body work.

Around the 280 bhp mark and up to 300 lb/ft torque. As you can tell from the video though the torque comes in really early

That's pretty healthy, enough to give the car a good workout!

@@RPIEngineering Unfortunately that low rise manifold will be costing you a lot of BHP, I suppose you did not have much choice really. Even the Edelbrock Performer manifold starts to become the restricting factor on a tuned 4.6, port matching helps a bit!

I've seen lots of different engine swaps in different cars before. Even a SR20DET Nissan turbo engine in a MGB however as the MG B GT was factory produced with the Rover V8 engine fitted many customers like to keep it this way and as its the engine we have focused on for the last 30 years its why almost all our videos etc are Rover V8 based.

RPIEngineering, how about head gasket issues? I know my Range Rover had to have its heads redone twice. I loved the 2000 4.0 SE that I had but mine was a very limited production model that met California emissions standards. You could only use parts for that particular model and that year only. I was going to do an engine swap but could never get answers from Land Rover on bolt patterns on the transmission bell housing. I wanted to install a Chevrolet 400 small block in it because it was a high torque engine. I finally sold it to my repair shop owner. Even with the tons of issues it had I loved the old girl.

@@arttafil6792 If the engine is built properly and cared for well then there should be no head gasket or block cracking issues.

RPIEngineering, no block cracking but head gasket and warping of the heads. The second time it was repaired the left head was.003 out and the riright head was .004 out. Once they were planed it required a thicker head gasket. I had a solid copper gasket installed. All new grade 8 head bolts were installed and sequence torqued per my instructions. Old time hot rod method.

Yes it is

Its the standard MGB GT V8 rear axle. Feels great to drive however with a 4.6 under the bonnet it would probably pull another 3 or 4 gears :-)

@@RPIEngineering what torque can the gearbox take and have the ratios in the gear been changed to suit the V8?

@@mgbroadsterJ The diff ratio on the Mazda and the MGB GT are identical so the ratios in the gearbox are left exactly as they are and it feels like a great setup when driving. The box is rated up to about 250bhp however there are lots of turbo Mazdas running 300bhp and not breaking the gearbox so the customer with this car was happy to install the 275bhp (ish) 4.6 engine in front of it. Of course subjective to traction and driving style. For sure if you were drag racing then you would want the T5 box

@@RPIEngineering The best ratio rear axle is a MGC diff 3.3:1, MGB standard is 3.9(too low) and MGBV8 is 3.08:1(too high)

@@biggles145 Subjective to what you want to use the car for really. There is no idea final drive ratio for everyone, nor is there one engine build that would suit all.

Nope no need, we see cars with both balance pipes and without and see no difference in how they run. Makes a difference to how they sound depending on how large the pipe work etc is.

To annoy you. Job done.

Hi, Yes we can supply oyu with engine and gearbox etc however it would be best to discuss this via email on info@v8engines.com

Push the highest point down the small amount needed whilst filling. No issues at all.

:-) It depends if your a purist or a motor head. From where I am sitting its one of the nicest MGB's I have ever seen and been lucky enough to drive. However if you are looking for an all original MGB GT V8 then for sure this is not that.

The keep it simple approach. We have gone to EFi on the MG's in the parst with great results however this carb does so much of what you need without the expense and extra work involved for EFI.

@@RPIEngineering Thanks for the quick reply. I am in the early stages of planning an MGB GT conversion using a Rover 4.6. I assumed that EFI vs carby was an easy decision, but from your reply it seems I may have to do some more homework. When you say "expense and extra work", is that in the context of this particular project and the customers desired time frame and cost? If like me you were starting with a blank canvas, would EFI be viable? Sorry for long question, but with your experience I value your opinion.

@@ricbarker4829 Each project is of course individual. Out and out power is very similar between EFI and carb. Efi will always win in terms of drivability as with computer mapping you can get fuelling spot on under all circumstances where as with a carb there is sometimes a small area that is not quite right, however that being said I'd be hard pressed to find that scenario when out driving normally. Best to me a call on 01603 891209 (Ian) to have a chat about the different setups etc as far better to bounce ideas back and forth on the phone than emails etc.

Again, thanks for replying and the offer for a chat. I might just give you a call when I get closer to trigger pulling time. Like I said, I am in the early stages of planning the build and still trying to get my head around the legalities here in South Australia when it comes to putting a 4.6 into and MGB.

@@ricbarker4829 AH yes finding out what emissions laws you might need to comply to etc might effect what fuelling setup you go for if CAT's have to be used.

Hi, Every car is different depending on what is needed etc. If you would like to email through to info@v8engines.com with what you have already etc we can then advise you better.

RPIEngineering its a 76 mgb gt

@@alterra9774 Hi, Please email through to info@v8engines.com with your current setup (i.e the details you have already given along with current engine setup etc) I can then email you a detailed quotation, which is far to much to post on a RU-vid comment. Kind regards, Ian

RPIEngineering ok

RPIEngineering it says the email wont go because “user hasn’t enabled emails to this address”

Normally best to email info@v8engines.com, you can also call us on 0044 1603 891209

Sorry, at 10:33 in the video I had spotted some steel cut out farmers in the field. I assume bird scares but the camera did not really pick them up.

@@RPIEngineering scarecrows

This engine is fitted with our Stage 3 heads.

Well the Mazda box is doing everything that we need it to at the price range / power level it is rated for.

Nothing wrong with Mazda box, very strong!

Robin Horton hahahaha you really don’t know what your talking about !!