Custom Inlet Manifold

[Mark]

I finally went along and fitted my manifold and new carb today, car kinda runs but dies after a few seconds, when opening the throttle the car dies instantly and can only be started by opening the choke.

before the vacumm advance hose was connected to the standard manifold and then straight to the dizzy, with this new manifold there is no where in which it connects so has to go from the carb to the dizzy, my question is will the timing be wrong? reason being is that the car starts better and idles sometimes by itself with the vacumm unattached.

and help would be appriciated. see pics and a video of what i mean.

P.S i sorted the alternator belt out after taking the video lol.

 

[Mark]

and a picture of it when i started earlier today

 

[D4R73N]

whats that noise in the movie?

 

[bobsp16]

mark blank off the advance and retard on the carb and set your timing @ 20 degrees advance @ 4000 rpm..and put a standard needle in the carb out off a metro 1300

 

[Mark]

I had the carb Re-con'd and the specialist put it all back to standard.

It wont even run at the moment properly, wont idle, it just revs up then die's. Could it be the timing? hope its down to the timing.

do i set the timing with the dizzy blocked off still? but then still leave it blocked?

 

[Ed]

Mark, Bob has just told you what to do. re-read his post and do exactly as he said.

 

[Mark]

Had another go at it today, I've blocked off the vacumm on both the dizzy and the carb,

I took some pictures to show how the fuel pipes are connected, but i still cannot get it to run more than a few seconds, I advanced the timing slightly and it starts better than what it did,

any help would be appriciated,

I've also attached a Video clip so you can see what i mean. all i did was pull the choke out, I did not touch the accelerator pedal at all it dies on its own..

 

[Speedle]

have you adjust the fuel mixture on the carb mark? it maybe its not getting enough fuel, very odd ive never seen a car run for a few seconds then die like that. the only thing it reminds me off is when the idle speed compensator vacuum hose is disconected.. this would stop the car ticking over with a normal hitachi carb. but then if you have blocked off the vacuum!?!... got me puzzled!

 

[Mark]

I'm going to take it off again tomorrow and fit it with new gaskets as its leaking water and burning it. i've changed the fuel return pipe as that was wrong and was actually a breather.

should run properly when its correctly sealed. I hope

 

[Speedle]

indeed if it s leaking that would certainly do that, hope you get it going

 

[Ed]

It did look to me that the pipeing was not right, however I dont know those carbs so I couldn't comment.

 

[Speedle]

It did look to me that the pipeing was not right, however I dont know those carbs so I couldn't comment.

excatly what i thought but like you say when you have never done it before all you can do is guess...

personally if i had a custom inlet id still use the hitachi carb with it as im sure it would work very well with a better flowing inlet manifold

 

[Mark]

standard carb is 34 or a 32mm, this SU is a 46mm and has been made to fit this manifold

so a standard Hitachi is useless

 

[ohc_turbo]

would be nice with a big webber though

 

[Speedle]

standard carb is 34 or a 32mm, this SU is a 46mm and has been made to fit this manifold

so a standard Hitachi is useless

i didnt mean using it on your manifold i meant using it on a custom inlet for it... the hitachi carb is a lot better than you think size of the chamber isnt everything

 

[Mark]

anyone know an approximate price on getting it all set up on a rolling road?

 

[Speedle]

dpesnds where you take it, usally RR's charge by the hour ring round your locals for quotes cheif

 

[Mark]

I had it on the rolling road today and i have to say that this manifold and carb has added a fair amount of power to my little MA12.

car is so much more powerful now. cant believe how much faster it is lol.

will get some pictures up when i get a chance to upload them off my mates digital camera

 

[micra man]

What power is it running at??

 

[bobsp16]

i bet youve added 15 to 25 bhp over standard

 

[bobsp16]

inlet manifold

if nissan had made there inlet manifold internally bigger on the ma10/12 engines from 25mm standard to lets say 30+ like most other engines of this size ie nova's ax's clio's
You would see an increase in power i think on the ma10 from 50 to 65+bhp and ma12 from 60 to 80+bhp.
at the time when these engines were being developed say early 80 pos late 70s they were very addvanced for its time

 

[Mark]

its added a fair bit of power,

its a shame that i'll have to see it go early next year

 

[bobsp16]

Why you selling it

 

[Arnold]

its added a fair bit of power,

Glad its set up and running! Some figures would be nice tho!

 

[Mark]

because when i'm 21 i will be driving my Uno turbo.

will more than likely be putting the micra up forsale end of january as thats when my insurance runs out on it. will be selling it with everything on it.

 

[Fordy]

will more than likely be putting the micra up forsale end of january

if you do sell it mark how much will you want for it? and what would come with it like manifolds and exhaust etc?

 

[Mark]

will be selling it with everything on it.

will include everything, dont know how much yet, might be end of january or april.

 

[jawadbutt]

very nice my friend watch wen mines done. luks very gud though

 

[Ne1LL]

would an ma12 carb fitted on an ma10 make any difference ? of is it just useless work...

 

[Mark]

useless work,

the carb is not the problem it is the inlet manifold which is.

 

[Speedle]

the ma10 carb for some reason has bigger jets than the ma12 one so the ma10 carb works best on the ma12. not the oter way round. its all very well forcing more fuel in but you need to get more air in there too which the inlet manifold restricts

 

[Slim]

yes, MA10 carb on a MA12 makes quite a difference

 

[Ed]

I'm not convinced - sorry! Even more so if were talking about the ECC MA12.

 

[ohc_turbo]

ive got that setup and cant tell the diffrence but i didnt have a ma12 carb to start with so i cant make a comparison, i can just get it up 105 but thats probably about 90 if that helps

 

[Speedle]

speaking from experience the ma12 ecc carb is rubbish compared with the standard hitachi carbs its untuneable due to it fueling being electronically controlled and it does it badly at best

 

[ohc_turbo]

i think all that ecc stuff is basically for immisions purpose as oppose to a tuning point of view, it was a step in the right direction but not a big enough step, i would have though that if they made a MA12E, full computer manage fuel injectors/elec spark with afm etc. then it would be better but its not much point having the setup as it was.

 

[Ed]

OHC turbo the ECC system is a fully mapped 3D ignition system, its load metering is via a map sensor, its fuel reading feedback is via the lambda sensor, it has control of a single running injector which keeps the AFR at lambda=1 for emissions and economy, when in closed loop operation.

People underestimate this system, which is common with stuff where people simply dont understand.

The norm here seems to be - if you dont understand = automatically rubbish.

Ed

 

[micra_pete]

i've offered before, and im happy to offer again to see what i can do with the k10 ecc system, i dont have much spare time these days, but if someone has a spare they wouldn't mind losing i would be happy to see what can be done.

 

[Ed]

I may even send you one I have pete, I'm not going to put it back on a K10 as id just go straight with eccs.

 

[micra_pete]

i'll pass anything i find back on,

send me a pm if you want to send me one