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Jul 18, 2006 15:41:19 GMT
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Now, I know how they work, what was used where and so on... However....Did the Mazda 12B come in a turbocharged carb-fed flava? If not, is around 200bhp possible from a carb-fed model? Fat webers? Bike carbs? I'm just...pondering stuff... *n
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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Jul 18, 2006 16:22:09 GMT
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over 300bhp is possible for a carbed IDA fed 13B, naturally aspirated!
a triple rotor on about 12psi can make 500bhp reliably, and a 13b can make 350-400bhp with good intercooling and proper fuelling at 15psi
What are you thinking? Remember its worth it just for that noise!
J
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Jul 18, 2006 16:34:33 GMT
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I'm thinking of not spending quite that much money Nah...I just have an idea...And the car in question has quite a small engine bay...So rather than hack at the bulkhead, I thought why not ditch the iron lump and go for a nice little rotary? How are things with regards to rebuilds/seals? Is it a DIY-job? what kind of service schedule would you be looking at? From what I can remember, simple porting releases a LOT of power (getting rid of the 'bridge' on the ports(?))... I'd want a reliable 200-250bhp...DIY as much as possible *n PS: Any engine that I can lift myself is allll goood
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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Jul 18, 2006 17:28:40 GMT
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The rotary is iron too, very heavy for it size, but lighter than most iron block engines. Rebuilds can be undertaken at home, as long as there isnt any scoring and significant wear. Porting can be undertaken but care has to be taken, a lot of care! Thi is becuase the shape and size of the ports relates effectivly to what cams do in a normal engine, and getting it wrong, or differeing the shapes from one housing to the next can ruin an engine. The bridge you talk about it the difference between a 'bridge port' (jolly large) and a 'monster port' that was developed to get around the peripheral port outlaw rules. Heres some porting - www.turborx7.com/portingpictures.htmPort timing - www.turborx7.com/porttiming.htmPorting at home - Inlet - www.mazdatrix.com/faq/portintk.htmExhaust - www.mazdatrix.com/faq/portexh.htmAnd bridge porting - www.mazdatrix.com/faq/portbp.htmAnd the 12a does seem to come in carbed turbo form, you may be in luck! J Nope I'm wrong, it dosent, but it can be turbocharged, ive gont one in a magazine here!
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Last Edit: Jul 18, 2006 17:33:01 GMT by Blown_Imp
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Jul 18, 2006 17:29:36 GMT
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Oh and there no way i can lift a rotary engine, but then again I'm only little! I can just about manage each end housing!
J
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Jul 18, 2006 17:38:51 GMT
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I really should read up more about the 13b lump, as my little skoda has one in the boot
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Jul 18, 2006 17:48:43 GMT
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On the skoda transaxle? Id be careful of hard starts, the pinons are a little chocolatey!
J
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Jul 18, 2006 18:17:59 GMT
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Its got a type 2 box on it with an adapter plate. Its still a bit.. temperamental, if not stupidly fun. Anywhere I can read up on rotor lumps? Especially 13b's
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Jul 18, 2006 19:15:52 GMT
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The rotary is iron too, very heavy for it size, but lighter than most iron block engines. Yeah but it's better than the 20bhp sidevalve boat anchor the vehicle in question comes with as standard Good-oh Aaahhhh - I was just trying to recall something I'd read a few years ago Bonza! Thooper Dooper - would it just be a case of whacking a suitable carb on (pressure-sealed R5/Metro Turbo or bike carbs? I understand that they're suitable for forced induction setups...), fabbing a manifold, oil return et cetera? *n
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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Jul 18, 2006 20:00:04 GMT
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Right i was partially right, there is a 12a turbo, but its not a carb setup. 160bhp standard at 6psi boost, with no intercooler. This can be improved with an intercooler and 10psi boost, but then the turbo gets restrictive, the same boost and the turbo off of a 13b will give 30% more power! More details here - www.hitman.hm/12AT-hints.htmOh and get the videos of that car, its mental! 13b/12a triple rotor! J
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Snoozin
Posted a lot
Toyophile
Posts: 1,557
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Jul 18, 2006 21:23:11 GMT
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On a totally (semi) unrelated note, a couple of guys here have built 12A and 13B based quad rotor engines..... the sound is something else!
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Jul 18, 2006 21:40:47 GMT
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everyone loves a r26b, the quad rotor engines are ace, one of my personal favorites is the scoot quad rotor, although the rx7 with the air cleaner out the bonnet that ive seen a video of at willow bank(mabe!) sounds ace too.
Apparently hurley engineering over here make a 6 rotor engine, although ive never seen it
J
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Snoozin
Posted a lot
Toyophile
Posts: 1,557
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Jul 18, 2006 21:58:21 GMT
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A 6 rotor!!! Crikey, the eccentric shaft for that sucker would be a work of art, any pics/or info available on that? Would love to see that!
The Scoot one is superb (weird looking car though!), the Lawton boys from a wee NZ town called Paraparaumu have built a twin turbo quad rotor, it's set to run 7's shortly....
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Jul 18, 2006 22:12:22 GMT
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Is that the queen street smash / BarB BMW? That also sounds ace!
One of the cars on my to build list is a 787b replica, all time favorite racing cars. Detuned by lowering the RPM limit, even at the end of running flatout for 24hours the housings were still within the manufacturing tolerances, no where near the upper and lower wear limits!
J
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Jul 18, 2006 22:28:25 GMT
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ahem ... carbed 13b, in small engine bay, but with a few bulkhead mods. This should give you an idea of size I'm hoping for 170+hp with the standard block but with a 48 dellorto and a nice exhaust manifold rather than the emissions curse word that they come with as standard. I have the engine in and out the car a lot at the moment so any measurements and photos are easy to come by.
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Jul 18, 2006 22:30:17 GMT
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PS I can lift my 13B short block (not very far though!) I reckon it's about 80kg in weight
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Jul 18, 2006 22:32:46 GMT
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IIRC the lawton car is a late model mazda 323, not the beemer
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Snoozin
Posted a lot
Toyophile
Posts: 1,557
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Jul 18, 2006 23:33:58 GMT
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Yeah, you'd be right, the Lawton car is a 323 SP20 shell on a tube frame chassis.
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Saru
Part of things
No Brand Loyalty
Posts: 460
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However....Did the Mazda 12B come in a turbocharged carb-fed flava? Interesting that you write 12b. Originally the 12a was the twin-dizzy version of that motor and the single-dizzy version was supposed to be called the 12b but according to some Mazda had spent so much on saying how good/reliable the 12a was that when they went to the single dizzy they kept the name. Yes. IDA webers are the go, though people are starting to modify the standard nikki carbs to good effect.
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1974 Saab 99 EMSI bought a new car. It's 35 years old. My friends said I was mad. We'll see.
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ahem ... carbed 13b, in small engine bay, but with a few bulkhead mods. This should give you an idea of size I'm hoping for 170+hp with the standard block but with a 48 dellorto and a nice exhaust manifold rather than the emissions curse word that they come with as standard. I have the engine in and out the car a lot at the moment so any measurements and photos are easy to come by. Nice fit - what's it in? Plenty of room for cooling up front *n
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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