May 2, 2022 · The car is a bit of a plodder and the rotary is like a hyperactive hummingbird. The MGB's mass would be fighting the engine the whole time. The rotary works better in the MG midget with its light weight and willingness to explode into acceleration with the rotary revs. My other objection is that I don't think the rotary looks good in the engine ...

Apr 21, 2011 · Is a 12A going to make 12/13ths the power of a 13B? 13b is a 13b so no more power and they are the same capacity, ports relate to the cooling of the engine. The 4 ports respond better to old school porting. 12a is lighter and can potentially make around 280hp in full race trim NA, the 13b can reach as much as 320hp.

Dec 23, 2011 · For simplicity, we’ll use the 13B engine as the standard we’re calculating. You can use these ideas and apply them to a 12A or 20B yourself. The rotary engine is obviously unique. The engine has two rotors shaped roughly like a triangle. This makes for three combustion faces per rotor and a total of six for a standard two-rotor engine.

Jul 11, 2016 · The car is a 1978 MG Midget that was nearly restored prior to being completely submerged in a flood. I pulled the stock engine and put in a 12a rotary. I blew up several rear ends before deciding new parts were in order. I went off the deep end and cut away the bodywork and have built a tube frame.

Oct 1, 2015 · IF you did run into 12a parts supply issues, Racing Beat has a 12a to 13b engine mount adapter for about $120, there's also an intake adapter that allows you to retain the carburetor (a holley 350cfm available too). In San Antonio a "13b" craigslist search would sometimes yield $50 engines that died and had been removed.

Dec 28, 2022 · The rotary engine is a unique animal, combining low compression ratios with high combustion temperatures. It also requires a fuel that can deliver lubrication to the apex seals. Since that sounds like a tall order for the fuel, we asked for product recommendations from someone who knows championship Mazda race cars: Jesse Prather of Jesse ...

Aug 8, 2024 · Essentially, it was the same 12A rotary engine from Mazda’s RX-3 sedan, mated to a five-speed transmission and live rear axle. Brakes were disc at the front and drum at the rear; optional rear disc brakes and a limited-slip differential …

Sep 12, 2018 · A reliable 200hp engine would be a street ported 13B built around as many 12A parts as would work in a 13B, with FC rotors for the RPM- and chrome-friendly 2mm apex seals and 12 pin rotor gears. This is by no coincidence the basis of the engine in …

Jun 12, 2020 · That's a tad unusual, though. A decently screwed together rotary shouldn't really produce that much in the way of vibrations. Yeah my 13B in the Midget is solid mounted. Other then the exhaust you can't feel the engine at any RPM. Like literally no engine vibration. I'm not sure what all was done to the 13B in the MG I bought it from the forum.

Aug 25, 2023 · Billed as a “solid Oklahoma car” that’s been “stored for years,” the RX-3 features a twin distributor 12A rotary engine that’s backed by an automatic transmission. Sure, it’ll probably need a lot of work to be roadworthy again, but when was the last time … Read the rest of …