what are the 48 flatslides worth?

Those Mikuni HSR Flat slides are pretty decent carbs, they come in 42,45 and 48mm.

The 48mm flows the same as a 32/36DGV Weber - how ever Mikuni rates the 48mm for a 2 liter motor.

Ive asked for prices and as it is the "best" one of them all (the 48) the prices are somewhat exponential - so a brand new 48mm goes for 500 approx. where as the 42 is around 350 and the 45 is about 400.

You can get them in a fully (hand) polished finish which goes for about 800 for the 48mm carb. Not worth is as its costing you money, for no more performance but the added problem of worrying about scratches on it etc.

Ill stick to my 45mm or 50.8 mm spit polished Stromberg or SU :)
TopGear got 100kw with the 45mm strommie.

That link to topgears setup is awesome. Style and simplicity rolled into enough power for me.

enough for 95% of people

Never was much of a SU man. I dont mind the CV function, but I just don't like the look of an SU. Each to his own I guess...

As time goes on the old never looks out of place while the new looks tacky.
I prefer old looking things than modern. Each to his own of course.
Good that most Flat slides in plain chrome look old skool also :)

Following this with interest as I'm putting a suck through on my L20B using 44mm Brit SU.

I love the simplicity of it all but things like water/meth injection are a bit of a mystery.

Dasonovic's 7 years of 30 pound thread is a great place to start tho. http://datsun1200.com/modules/newbb/v ... =ASC&type=&mode=0&start=0

One question - he has put the water/meth inlet in front of the carby.

Al la this




Does this mix the water w fuel better thus avoiding eroding the turbine with water droplets you alluded to ewarlier diymark?

Obviously it lasts at least 7 years so the water is not rusting out the carb or anything, or is the key having a 25% mix with methanol?

I was thinking that should I want to adapt the flat slide draw through setup to other cars (larger engines) what could be done in terms of carburation as the 48mm Mikuni is sort of maxed out on 1200cc's.

Turns out they make these!

http://www.thecrankshopvt.com/product ... 1f2ab095e78cb97202bef15a1

While looking boring and like a science project - they should work just like any other flat slide - only down side is there is no accelerator pump - which on a carb that big its nearly a prerequisite.

The 52X65mm one flows 2800 "units" and the Mikuni 48mm flows 1800 "units" - thats 55% more! Pity they look crap.

@thedevilshands

He put it before the turbo (non pressure side) so he could use a washer bottle with integral pump (low pressure) for the injection just to make it easy, simple and cheap I guess.

It doesn't make it easier on the turbine as in the end the compressor wheel is still being bombarded with water droplets (much heavier than fuel) so when the turbine spins at +100,000rpm they will erode.

Then again I don't have any experience with this turbine erosion as I've only heard of it on the net - come to think of it I tried looking for pictures for this elusive erosion and didn't find any! So, you probably can get away with the washer bottle way but its harder on the turbo and doesn't work as good as proper injection because when you run a high pressure pump (100psi) the water and metho coming out of the fogging nozzle is very finely atomized and mixes better with the fuel/air.

Pumping it before the turbo doesn't really mix it with the fuel/air as the turbo acts like a centrifugal pump and separates the water from the air charge.

So, the washer bottle does work (hell it's worth a shot too because it takes nothing to get it working) but a proper setup is much better.