View Full Version : twin carb very small block
turbojolt
16-07-08, 08:43 PM
if i wanted twin carbs for a 1.2 could i use 2 carbs from a sr nova rather then the more expensive webers and would i have to rejet them to suit the small engine :thumb:
Which inlet manifold exactly are you intending to use?
turbojolt
16-07-08, 09:05 PM
to be honest im not sure yet im thinking out aloud
hopeing to get some people to let me know what i could use on a small budget so i dont want a one off inlet manifold made
matt_vaughan
16-07-08, 09:10 PM
Its not massively hard to make an inlet manifold, was going to make one to fit 600 bike carbs to my 1.2. However, bike carbs tend to have rubber fixing socks which make it easier, however, I'm sure it could be done similarly.
turbojolt
16-07-08, 09:18 PM
how would you make a inlet manifold then amte and how much do you recon it will cost
tbh the fabrication costs would probably outweigh a decent second hand carb set up.
turbojolt
16-07-08, 09:34 PM
thats what i was thinking is there no way to do it on the cheap
what are you trying to achieve?
what are the long term plans for the engine/car etc etc etc
turbojolt
16-07-08, 09:52 PM
well im planing out right now a cheap lil 1.2 engine with a bit of poke i want to carry out the 1.3 manifold cams and all the other stuff you can get for cheap and bolt straight on
i know all the negative comments you can put a 2.0ltr in for that but that not what i want i like playing around with engines and like to do it on the cheap even more lol
so im not looking for a huge hp car just something fun that i can have making and driving after
imho I'd get the intake system from a 1.6 gte/gsi (should be a few about cheap with folks chucking them for carbs) mess about filling the bottom of the 1.2 inlet ports. Use a megasquirt ECU and have a mpi 1.2 that you can then setup to anything you want and the management/intake is moveable to a 1.6 no troubles when you have more cash to spend.
plus it would be very very economical on fuel if you wanted it to be (unlike any carbs, let alone your idea)
turbojolt
16-07-08, 10:00 PM
to be honest i was looking for something i could do myself more rather then spending money on people mapping my e.c.u
and i think i want carbs because i want it to be a old school car with the old sr bumpers and so on
its a 1.2 engine, its cost is about 20pence.... ideal to use for leaning howto map ;) if you lunch it, you spend 20 mins fitting a new one and "dont do that" again in the ecu lol.
old skool looks with modern skool technology is cool ;)
oh and getting carbs on the cheap invariably means the spindles will be bent/setup badly and you will enter the land of crap running etc that the old wives tales portray... good reliable carbs cost reasonable cash im affraid.
turbojolt
16-07-08, 10:06 PM
urmmm you seem to have a good point there Stuart i hate it when people use logic against me lmao
think i might have to do that to be honest but would have to wait until i car get a garage to store a second play about car in lol
would it be better to buy a 1.2i nova for that rather then the carb model then
If I were in your/anyone with a 1.2/no budget's position I'd use it as an excuse to learn as much as physically possible with ECU's and playing with all kinds of ideas and theorys since you wont set the world alight with performance so insurance should be cheap and the engine itself is fairly robust + cheap to replace should you go too far lol.
Learning on expensive stuff isnt as much fun, trust me!
turbojolt
16-07-08, 10:13 PM
would be a good learning exercise to be honest
would be top knowing how to make engine maps lol how hard is it to set up a mega-squirt system what do you have to do set up the fueling and spark and so on
piece of piss to setup. its the time and subleties that take the effort. But there is tons and tons of info about.
Ideally you want a wideband lambda sensor but you could get around that with a normal narrow band sensor and then go very rich on full load, pull a spark plug out immediately and see how sooted up they are and tune to the plugs (old skool).
Spark is a new world of intersting stuff. Lots of DIY info on an australian website if you google DIY det/knock sensor etc etc
turbojolt
16-07-08, 10:18 PM
Stuart if you know how to do it why don't you make a easy bit by bit article about it for all use noobs in the world of engine managment lol
help us learn lol
asso how easy are they to wire up
lol, he's never done it. He's suggesting you experiment and work it out for yourself. Then YOU would be in the best position to write a useful guide :)
turbojolt
16-07-08, 10:32 PM
i suppose lol has no one here set up a megasquirt system then
i could be the go to guy when it come to doing it lmfao
i suppose lol has no one here set up a megasquirt system then
i could be the go to guy when it come to doing it lmfao
I meant he's never MPI'd up a 1.2 before lol The mapping software is uber easy to pick up and theres loads of help online if you need it too.
Get an SR engine for £70, job done.
the std 1.2 carb will actually work well up to 80bhp easily. I used one on a 1.3-rebored to 1400 conversion for several years, it went very well
turbojolt
17-07-08, 01:48 PM
Get an SR engine for £70, job done.
i could do but then that's just boring and predictable
i don't know about you lot but it dose seem to me that novas are following a set design now days
Your 1.2 Carb is a Cracking engine lad. 1.6 Cav Carb and Inlet, K&N, a larger Manifold and system (try a nova GTE/GSi Set Up) and a damn fine servicing and you'll reach 100mph+ which isnt bad for a 1.2.
turbojolt
17-07-08, 02:06 PM
Your 1.2 Carb is a Cracking engine lad. 1.6 Cav Carb and Inlet, K&N, a larger Manifold and system (try a nova GTE/GSi Set Up) and a damn fine servicing and you'll reach 100mph+ which isnt bad for a 1.2.
you can say that again and its would all be budget stuff no expensive cams or head work which is a massive plus in my book lol
craig green
17-07-08, 02:19 PM
i could do but then that's just boring and predictable
i don't know about you lot but it dose seem to me that novas are following a set design now days
But the 1.3 is such a far nicer engine to drive/use. It might be down to the camm profile but compared to my mates SR, my old 1.2 carb used to run out of puff where his 1.3 would start getting into its stride. - way quicker.
The 1.3 has smaller pistons than the 1200 but a much longer stroke. If you are up for building an engine, use a 1200 block & pistons with a 1300 crank & rods. That gets you to 1400cc or thereabouts & makes a rapid engine if fuelled correctly.
[quote=Dod]100mph+ quote]
not without serious head & cam work!!!!!!
might say 100 on the clock.
a 1.3 with 75hp can't do 100
turbojolt
17-07-08, 02:27 PM
well is i had a 1.3sr crank and rods, camshaft, 1600inlet and carb , gte/gsi exhaust manifold and system on a well maintained health engine any ideas of a round about power figer that could be achieved
i know its a stupid question as you can never really know but would i be wrong thinking between 75 and 85 hp
[quote=Dod]100mph+ quote]
not without serious head & cam work!!!!!!
might say 100 on the clock.
a 1.3 with 75hp can't do 100
I've been told this before and that theres an on going debate with this but I've done 105 in my 1.2 SPI which I know is innacurate but in my 1000cc I managed 93 and this was confirmed by a mate in a brand new Caddy Van following me and I'm pretty sure VW are pretty accurate with their most modern technoligy. So why shouldnt a better slightly larger engine do 8mph+ more?
a standard 1.2 will do 100mph :) infact i got 101 down a hill. starting to wish i hadnt given my megasquirt to my mate now then i could have put bottle throddies on my 1.2
hmmm what to do with my spare MS lol
give it to me :) providing its a v3, anything before that was weird
Sell it.
Before v3 is pretty much the same, just slight board pcb changes,the software is the same so the difference is minimal... ?
turbojolt
17-07-08, 04:09 PM
what carbs would bolt straight on to a Irmscher inlet manifold and would the manifold fit on to a 1.2 head
iirc the irmscher manifolds were fitted to 1.3's only meaning it was a cathedral port and yes they fit the 1.2 head.
anything with a DCOE/DHLA style flange (Jenvey TB's / carbs )
turbojolt
17-07-08, 04:22 PM
so in truth i could get 2 carbs from a old ford escort and fit them to the manifold for a cheap twin carb convertion
No ford escorts have dcoe/dhla's fitted
turbojolt
17-07-08, 04:32 PM
i could have sworn the old sierras and escorts were fitted with dcoe
what cars would i be able to get them from then
Well your not going see any in a scrappy with them on tbh.
Try ebay, or you can buy them new for about £250 new,Lol
turbojolt
17-07-08, 04:40 PM
Well your not going see any in a scrappy with them on tbh.
Try ebay, or you can buy them new for about £250 new,Lol
Na i was thinking of a cheap way to have fun with them 250 quid is a bit steep lol
craig green
17-07-08, 04:47 PM
i could have sworn the old sierras and escorts were fitted with dcoe
what cars would i be able to get them from then
Hell NO! lol
Na i was thinking of a cheap way to have fun with them 250 quid is a bit steep lol
na, thats just pocket change on them, you dont even wanna know my expenditure so far. :tard: lol
turbojolt
17-07-08, 04:53 PM
na, thats just pocket change on them, you dont even wanna know my expenditure so far. :tard: lol
i know its not mega expensive for them its just to expensive for what i have planed
£250? That would just about buy you a 2nd hand carb setup.
You then need to have them setup (another £100-£300)
Twin carbs are never a cheap option
£250? That would just about buy you a 2nd hand carb setup.
You then need to have them setup (another £100-£300)
Twin carbs are never a cheap option
ive been qouted 50 squids to have them set up.
turbojolt
17-07-08, 04:59 PM
ive been qouted 50 squids to have them set up.
who by a mate
"setup" as in what?
Just connect it to an exhaust gas analyser and adjust the idle mix screws?
A full setup will involved plenty of rr runs, checks, change jets, run again, check, repeat until all is good. Etc
Which is where it gets expensive seeing as most places charge £60+ an hour, without parts.
srd in launceston, he's nothing to flashy, he's just pretty handy with these engines, he tuned a 1.3 so that it reved up to nine grand, spat flames out the carb, and had torque steer.
i wont be going that balls deep, but should be a laugh
"setup" as in what?
Just connect it to an exhaust gas analyser and adjust the idle mix screws?
A full setup will involved plenty of rr runs, checks, change jets, run again, check, repeat until all is good. Etc
Which is where it gets expensive seeing as most places charge £60+ an hour, without parts.
he said possibly up to 100 pound if he has to change jets, but as the set up came off a 1.3 im hoping i'll be ok.
turbojolt
17-07-08, 05:23 PM
srd in launceston, he's nothing to flashy, he's just pretty handy with these engines, he tuned a 1.3 so that it reved up to nine grand, spat flames out the carb, and had torque steer.
i wont be going that balls deep, but should be a laugh
what the hell did he do to it lol
what the hell did he do to it lol
lots, i haven't really talked to him about it, but i will. :D i just know of it cause the guy that rents a room off me has driven said nova, apparently it was a proper weapon.
turbojolt
17-07-08, 05:38 PM
i love tuned small blocks
I wouldn't be taking my car to srd then.
Spitting flames out the carbs either means the ignition timing is out, or that its lean, or a valve stcuk open.
turbojolt
17-07-08, 05:46 PM
i smell bull plop
no honest i really do love tuned small blocks
lol
srd in launceston, he's nothing to flashy, he's just pretty handy with these engines, he tuned a 1.3 so that it reved up to nine grand, spat flames out the carb, and had torque steer.
i wont be going that balls deep, but should be a laugh:eek: oh my.....epic
well when its all done i'll bring it along to to a png rolling road day, as long as its this side of the m25.
i can post up some pics of all the goodies in my shed waiting to go on if you like.
and if your refering to my house mates comments about the previous nova, he really has no reason to lie to me, the carbs were sticking out the bonnet, i belive it was built fot hill climbs (yes some guys do run small engined cars down here.)
oh the sierra carbs were DGAS iirc.
well when its all done i'll bring it along to to a png rolling road day, as long as its this side of the m25.
i can post up some pics of all the goodies in my shed waiting to go on if you like.
and if your refering to my house mates comments about the previous nova, he really has no reason to lie to me, the carbs were sticking out the bonnet, i belive it was built fot hill climbs (yes some guys do run small engined cars down here.)no one is saying your lying as such, its just you made it seem that flames coming out the carbs is a good thing! i can tell you it really is not and is a sign that something really isn't right
no one is saying your lying as such, its just you made it seem that flames coming out the carbs is a good thing! i can tell you it really is not and is a sign that something really isn't right
fair do's, i'm not a spanner monkey, i just enjoy playing with cars, i was really after help and advice off you guys, as you seem to know your sh1t. (as long as its dont bother change the engine.) but its seems to open a right can of worms when this subject gets mentioned.
I guses i should just keep this project to myself.
turbojolt
17-07-08, 06:17 PM
well im interested in it
And to be honest i havent seen any really negative replies to your project
well im interested in it
And to be honest i havent seen any really negative replies to your project
i know fella, can tell your interested in this too, will pm you updates.
turbojolt
17-07-08, 06:26 PM
cheers i cant wait to start my 1.2 project should be a good laugh and having information on your should help me out a lot with the pitfalls and that good luck with it
Matty, youve missed the point.
The "tuner" sounds like they have either set it up badly or there is a particular compromise they made to the low down performance of that 1300 in order to get the top end.
IT WASNT AN ATTACK ON YOUR PROJECT may I suggest you get over yourself ;)
turbojolt
17-07-08, 06:38 PM
may I suggest you get over yourself
lmfao
turbojolt
17-07-08, 06:43 PM
matty w have you got a wip in the project forum that i can look at and if not why not lol
matty w have you got a wip in the project forum that i can look at and if not why not lol
no mate, but im taking lots of pictures.
turbojolt
17-07-08, 06:47 PM
get them up then mate come on lol
im just getting started, no point posting up in projects just yet. i can post up a pic of my nova and all the bits i have so far if you like, just not 100 percent sure where.
srd in launceston, he's nothing to flashy, he's just pretty handy with these engines, he tuned a 1.3 so that it reved up to nine grand, spat flames out the carb, and had torque steer.
i wont be going that balls deep, but should be a laugh
I did the same to a 1400 SR engine on my driveway, its not hard. (Hence the avatar pic over there <<< )
I would seriously look into getting an SR. Boring and predictable it may seem, but also financially viable :thumb:
turbojolt
17-07-08, 06:54 PM
matty just start on in the project forum as a working progress then we can see what you have been doing stage by stage
im just getting started, no point posting up in projects just yet. i can post up a pic of my nova and all the bits i have so far if you like, just not 100 percent sure where.
its the start of a project, just start a project thread....
even my kitchen has a fcuking project thread lol
well i was considering a 1.3 engine at a later date, as all the engine bits will be a straite swap. just wanna have a play with the 1.2 first.
if i can find one that is.
its the start of a project, just start a project thread....
even my kitchen has a fcuking project thread lol
ok, will give it a go.
just wanna have a play with the 1.2 first.
if i can find one that is.
i wouldnt waste your money on one TBH consider SR & GSi engines go for as little as £60.
turbojolt
17-07-08, 07:00 PM
its the start of a project, just start a project thread....
even my kitchen has a fcuking project thread lol
link me to the kitchen thread mate i fit kitchens every now and then
i know, i have a 200sx in my garage (well most of a 200sx lol ), if i spent on that what i have on the nova it would be around the 300bhp mark, i'am not after big power, just a go cart with a roof.
turbojolt
17-07-08, 07:05 PM
i know, i have a 200sx in my garage (well most of a 200sx lol ), if i spent on that what i have on the nova it would be around the 300bhp mark, i'am not after big power, just a go cart with a roof.
stick to your guns mate lol
just a go cart with a roof.
A stripped out small block then. (SR/SRI/GTE or GSi)
Mike and Mikey. this isnt gonna end lol.
Mike, accept they are keeping 1.2's and leave them be
stick to your guns mate lol
i will, not gonna have keyboard warriors push me arould :D lol :D
Mike and Mikey. this isnt gonna end lol.
Mike, accept they are keeping 1.2's and leave them be
cheers fella :thumb:
turbojolt
17-07-08, 07:11 PM
yer mike
keyboard warriors lmfao
lol
I ran a 1.2 for 90000miles. it blew up. I got a 1300 block & had it bored to take 1.2 pistons. the pistons needed pocketting. the crank & head were also checked & machined. the car ran a 1.2 carb, 1.3 manifold & system, the 1.2 4 speed box (which has the same top gear as a f13cr)
it could pull cleanly from 15mph to 115 in top.... it had about 85-90hp, I ran the engine for another 50000miles (in 2 novas & a mk1 astra) before selling it to a bloke for his astramax, I had upgraded to a 1600 gte lump by then. I did the engine in 1991, before there was a tuner on every street corner like there is today. Its ok to insult us but remember, we were there doing it before you were born. twin webers do not produce enormous horsepower, but they help if you spend loads of money on the internals
Here's a poster for your garage wall:
http://phd707.com/stuff/hoffbikecarbs.jpg
Just search for carbs in the Motorcycle category on ebay and get the cheapest set of 4 mikunis you can, don't panic about the size. then buy 4 stroke performance tuning by A. Graham Bell and give it a go.
What's the worst that can happen? Like Stuart says, 1200 engines go for next to nothing.
Or get your chequebook out :tard:
I ran a 1.2 for 90000miles. it blew up. I got a 1300 block & had it bored to take 1.2 pistons. the pistons needed pocketting. the crank & head were also checked & machined. the car ran a 1.2 carb, 1.3 manifold & system, the 1.2 4 speed box (which has the same top gear as a f13cr)
it could pull cleanly from 15mph to 115 in top.... it had about 85-90hp, I ran the engine for another 50000miles (in 2 novas & a mk1 astra) before selling it to a bloke for his astramax, I had upgraded to a 1600 gte lump by then. I did the engine in 1991, before there was a tuner on every street corner like there is today. Its ok to insult us but remember, we were there doing it before you were born. twin webers do not produce enormous horsepower, but they help if you spend loads of money on the internals
I never ment to insult anyone, yeah you guys have done everything and have found the best way to do things, but we just want to have a play ourselves, and just want your guys help with what we want to do. ( i want to try a twin carbed small block) not told not to bother, put a different engine in. if people arent interested in this why not just ignore it?
im personaly very interested in that engine ran (although i'll be lucky to find a 1300 block. :tard: )
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