pros and cons for 20b or v8

[600gaz]

I would have thought that a Lexus V8 or a BMW V8 would be far superior to a Yank one in both reliability and design . I think the Lexus V8 engine is reputed to be the best so maybe take a look at those before deciding .

[dthebuk]

This does not sound rubbish.

http://www.youtube.com/watch?v=8mvL5LroSpg&feature=youtube_gdata_player

1) im guessing thats a fairly tuned one as it goes to 8-9k
2) compare that to a 20b (http://www.youtube.com/watch?v=o3hEeose1-E)
3) it still sounds like a big lawnmower


each to their own though :3gears-lh


edit, i missed the end of that video you posted......dam, maybe i was wrong!

[Mir]

Well, guys I kinda lost the energy to argue over V8 and 20b . All I would say is, EVERY ENGINE BLOWS NO ENGINE IS BULLETPROOF. It is famously said that "Its not how you stand by your car, its how you race your car". This simple principle applies to rotaries and piston engines. Its how you look after your car decides your fate more than the choice of engine you install. So in nutshell, V8 has no comparison with 20b Rotary end off. I would like to see V8 street car, breaking Robs and James\'s record, then we will talk.
 
Mir

[re japi]

Ya, i would do everything to get 20b. And i like v8´s too. My friends owns lots of different kinds of v8 cars. They are awesome.

But cause i am "track" guy, i just dont think that v8 is best option. Just because they are heavy and big

But BMW´s M engines or v8 would be nice in FD. Much more compact and lighter than american lump.

[Grant Monkhouse]

1) im guessing thats a fairly tuned one as it goes to 8-9k
2) compare that to a 20b (http://www.youtube.com/watch?v=o3hEeose1-E)
3) it still sounds like a big lawnmower


each to their own though :3gears-lh


edit, i missed the end of that video you posted......dam, maybe i was wrong!

It\'s a NASCAR engine converted to fuel injection as they normally run huge carbs and methanol i think, part of their rules. A v8 revving this high could be put in a street car too, but I think a 10,000 rpm 20B PP non turbo would go longer and be cheaper to rebuild as there is less parts to replace.

[bimbleuk]

I\'ll post a side by side comparison of the two motor configurations so you can make your own mind up over which is bigger, heavier etc.
 
For me put the plenum on the rotary and they pretty much take up the same space. The V8 is certainly no further forward as they both end in line with the fuse box.
 

[4packet]

But BMW´s M engines or v8 would be nice in FD. Much more compact and lighter than american lump.

Think you have missed the point of the LSX engines and why they are popular in many cars not just FD\'s. They are reliable, compact and they are light. Head and block are aluminium. Single cam with push rod may seem like an old concept, but means the heads are tiny compared to a modern twin overhead camshaft design. A V8 is pretty short compared to a straight 6. Apart from a V6 it is the best use of the space to maintain decent weight distribution.
 
If you like rotarys then you will always aspire to the 20b so it\'s a futile debait, but if you want a reliable powertrain with sensible running cost the V8 puts a good argument forward. If you compare it to the 13b then the initial cost of the V8 can be excessive.

[B.Martin]

I\'m having deja-vu here i am sure. Have we not had this discussion about 1 million times already? :rolleyes:

[Grant Monkhouse]

I\'m having deja-vu here i am sure. Have we not had this discussion about 1 million times already? :rolleyes:

Yes but it\'s a good one

[Grant Monkhouse]

Think you have missed the point of the LSX engines and why they are popular in many cars not just FD\'s. They are reliable, compact and they are light. Head and block are aluminium. Single cam with push rod may seem like an old concept, but means the heads are tiny compared to a modern twin overhead camshaft design. A V8 is pretty short compared to a straight 6. Apart from a V6 it is the best use of the space to maintain decent weight distribution.
 
If you like rotarys then you will always aspire to the 20b so it\'s a futile debait, but if you want a reliable powertrain with sensible running cost the V8 puts a good argument forward. If you compare it to the 13b then the initial cost of the V8 can be excessive.

20B NA would be really reliable.

[bimbleuk]

Yep maybe an NA 20B would provide enough power without the heat and complication of the turbos and keep it Mazda.
 
The LSx V8 route in the US for example makes lots of sense as they are so readily available. Not so clear cut over here due to the limited supply.

[Mir]

I\'ll post a side by side comparison of the two motor configurations so you can make your own mind up over which is bigger, heavier etc.
 
For me put the plenum on the rotary and they pretty much take up the same space. The V8 is certainly no further forward as they both end in line with the fuse box.
 

wrong comparison mate:rolleyes:. If you see the firewall modification of both cars, you would see that the firewall of the V8 fd has been modified whereas, the firewall of the 13b fd is in a stock position. So No COMPARISON I am afraid
 
Cheers:WaveBye

[4packet]

Firewall hasn\'t moved Mir with the V8?? So comparison is still valid.
 
Out of interest how much power does the NA 20b reliably produce and still pass an MOT?

[Grant Monkhouse]

450fwhp if you get the ports right.

[dthebuk]

It\'s a NASCAR engine converted to fuel injection as they normally run huge carbs and methanol i think, part of their rules. A v8 revving this high could be put in a street car too, but I think a 10,000 rpm 20B PP non turbo would go longer and be cheaper to rebuild as there is less parts to replace.

surely the point of going v8 is to keep it reliable, i.e having it at fairly stock power with some breather mods? Stock big v8\'s must last longer than a pp\'d 20b surely?