11 replies to this topic

[Leekr89]

collecting my engine tomorrow from southam mini metro centre and just toying with a few ideas on what bolt on parts i should use,  its a 1330 with kent 286 cam and from what i have been told a stage '3' head (non southam), im buying a stage 2 maniflow exhaust manifold and 1 7/8" system, the cars really just used as a toy and was going to turbo but decided against the idea (after buying nearly everything i need!) i already have these 2 carbs and was wondering what would suit the engine for best performance, that or maybe sell and invest in a pair of twin hs4 carbs or even a weber 40/45? what just wondering what are your thoughts on this? thanks

[minilee94]

I have a poll thread about this a while ago

Weber 45
Hiff 44
And twin 1/12 and weber 45 got the most votes

Twin 1/1.2 of my understanding you get more low down torque but a weber is more of top end power output

[KernowCooper]

Weber on a efficient manifold will need bulkhead mods like a weber box, a HIF44 will suit and provide enough air for 110+ and so will twin 1 1/2s, twin HS2 1 1/4 will be to small

[Leekr89]

thanks i may try and find a set twin hs4's then, i thought the hs2's may be a little too small for what i need, yeh i thought the same.. from my understanding webers are good for all out power but what ive heard they are not good for fine tuning and tend to dump the fuel in, so fuel economy is out the window, but the roar they make sounds great..  bulkhead is not a problem i already have the clearance, car was originally (before i bought it) was going be a track racer so has a part miglia/turbo bulkhead welded in

[Big_Adam]

I forget, why do we only use the same ... 3 or 4 options?

 

Why do I never seem to see bike carb/throttle body conversions at all here?

[Cooperman]

My 1310 cc Cooper 'S' has a 286 cam, very well flowed big valve head and twin H4's (twin HS4's are just a later version of these).

It is fantastic above about 5000 rpm, but below 3000 it is extremely lumpy. I run a SC CR gearbox with a 3.9:1 FDR to get optimum acceleration.

[minilee94]

Because bike carbs have been proved to only give like 5 bhp more than a weber and all that time making a linkage and a manifold and drilling out jets etc there isn't no point

Edited by minilee94, 29 November 2013 - 10:42 PM.

[Chappb]

I've just built a fast road 1330 and i'm gonna be using a HIF44 mainly because they're capable of fuelling 100+ bhp if tuned correctly and they're an easier install. If Vizard mods are used on it too then it's a very capable carb. Should have a nice motor whatever you go for. Here's a photo of mine i've just built  http://www.flickr.co...05/11123524246/

[Cooperman]

That's a great and comprehensive photo record - well done. 

By the way, in terms of performance there is no such thing as a 'fast road Mini', they are really 'not quite so slow road Minis' these days when considered against the fantastic performance of even quite humble modern cars  .

[Chappb]

That's a great and comprehensive photo record - well done. 

By the way, in terms of performance there is no such thing as a 'fast road Mini', they are really 'not quite so slow road Minis' these days when considered against the fantastic performance of even quite humble modern cars  .

 

Thanks Uncle Cooperman, it's nice when things turn out good after getting great advice from people on here such as yourself. But yes that's such a true statement!!

[Cooperman]

 

That's a great and comprehensive photo record - well done. 

By the way, in terms of performance there is no such thing as a 'fast road Mini', they are really 'not quite so slow road Minis' these days when considered against the fantastic performance of even quite humble modern cars  .

 

Thanks Uncle Cooperman, it's nice when things turn out good after getting great advice from people on here such as yourself. But yes that's such a true statement!!

 

In relative terms they might be slow, but they sure are fun!

I was cruising at an indicated 90 mph the other day in my usual road car at 2100 rpm and I thought how my 'S' would be pulling just over 6000 rpm at that speed. That's 50+ years of engineering progress.

I guess the owner of, say, a 1914 Renault might have had the same thoughts if driving a Cooper 'S' in 1964, like, wow, 90 mph and 6000 rpm - fantastic when his 50 year old Renault would possibly manage around 40 mph flat out on a good day. Perhaps he might have polished the inlet system a bit, cleaned up the carb and called it a 'Fast road Renault' which then might have done 50 mph.

My standard road car does almost exactly twice the speed of an 850 Mini when flat out at 3400 rpm in 6th.

Just engineering progress and, maybe, why classic cars are such fun.

[jaydee]

HIF44, quciker to set up and provides a more accurate fuelling.

Twin HS4s if you want something with more 'grunt'.