View Full Version : Getting more out of a 1.4SR engine...
I have a standard 1.4 SR engine, what could i do to get more out of it, any info is great wanted, nothing like a rebore or twin 40's but maybe along the lines of a cam, RR tune?
I would recommend a rebore and some T 40's for a start.
sri head, cam, air filter, exhaust...
plenty of things you can do
turbo it or nitrous oxide :lol:
Philsutton
09-12-04, 12:04 PM
havent you already asked this? anyway go for twin 40s, the best thing you can do
nos is the "cheapest" way to get more go out of it!
nos is the "cheapest" way to get more go out of it!
lol i was right and i bet everyone thought i was just taking the pish :lol:
twin 40's with direct port noz :D :D
retrosi
09-12-04, 03:37 PM
get more out the engine by selling it....
strap the engine that skyline had in another forum in the front...then add nos....bobs you uncle...oh you may need to extend the engine bay a foot or two.
Well you did ask
well the way to go about it would be
SRi head
Twin 40s
Cam
and a bit of head work
Philsutton
09-12-04, 05:35 PM
Fit one of these bad boys on top of your carb
http://www.esuperchargers.com/images/schargermain2.jpg
Electric supercharger
General Baxter
09-12-04, 05:42 PM
well i have a 1.3
with webber 34/32, kent cam, 4-1 manifold and full zorst system
be having a b+ billy head with 1.6 vavles put on when barn sends it to me :lol:
lmao at electric supercharger...
broody, i thought i read someone in about 6 posts that your 1.4 saloon will be contain a pretty "well tuned" engine.. lol..
How much does Nos cost to set up and run !? What internal modifications do you have to do !?
im currently building up the 1.6 lump and it's gonna be a pretty stupid spec, maybe i can run it on what i have planned !? (which would be quality)
why have two people said sri head?? thats the worst out of the lot!! 1.2 head with the 1.6 valves is the way to go
i thought the sri head was the best one (so ive read)
the 1.2 lowers compreshion i know that
no the sri has got round ports which isn't as good as the "cathedral" (i think thats what they call them) shape ports
rite ive just compared the 1.2 and sri heads as i have both in my room and it seems in standard form the sri head will be better, however if you were to put the 1.6 valves into the 1.2 head then this would be better as the inlet ports is better formed and the 1.2 head has a smaller combustion chamber. the sri valves are better than the cavvy 1.6 ones i have also so put them in the 1.2 head i spose. i never new sri's had the same size valves as gtes/gsi's though :?
ollster
09-12-04, 11:19 PM
no the sri has got round ports which isn't as good as the "cathedral" (i think thats what they call them) shape ports
wrong way round mate the sri had a very efficient head, the 1.4 sr (i believe 'cathedral' head) was shocking, coupled with the higher f/d thats why they were always slower than the 1.3 sr's lol
why have two people said sri head?? thats the worst out of the lot!! 1.2 head with the 1.6 valves is the way to go
i said to use the 1.2 head mate as i know the 1.4's are crap
The round shape ports offer superior gas flow over any of the other port shapes, hence why 1.4SRs with twin 40s can gain another 8 - 10bhp with just an SRi head on :wink:
The round shape ports offer superior gas flow over any of the other port shapes, hence why 1.4SRs with twin 40s can gain another 8 - 10bhp with just an SRi head on :wink: you are rong my dear friend i shall try to explain. as the air passes threw the port the air that travels around the top of the port travels alot faster than at the bottom of the port, this creates more turbulence therefore slowing down the flow of the air. now with the cathedral shape it makes the air at the bottom of the port travel the same (ish) speed as the air at the top, therefore you get less turbulence and a better flow.
I can garuntee you its the round ports that make the SRi/GSi/GTE heads that bit special, otherwise vauxhall would of stuck with the cathedral ports :wink:
ollster
09-12-04, 11:53 PM
doesnt turbulance create a better fuel air mix so you get a better fuel atomisation? hence a better more efficient bang??
To be fair mate a lot of people i have spoke to have used sri heads with t40's on j series engines so there has got to be somthing right about them, although i am not distputing tat the 1.2 head is better than the 1.3 1,4 sr ones
sri head is the one you want. it got me 12bhp just from changing the head
Matt Nova
10-12-04, 12:35 AM
on a sr after full exhaust and k+N
if added a sri head then would it make a postive or would you need more
on a sr after full exhaust and k+N
if added a sri head then would it make a postive or would you need moreit would give you a postive
in standard form the sri head is better yes ok i agree but if you put the same valves into the 1.2 that would be better
ive done flow bench testing on a 1.2 head and found that if you build up a 3-4mm layer of material and blend it down to the valve you gain about 4% more air flow, ok 4% isnt much but its a gain from reducing the port size and making it nearer round.
read vizzards book on ford sohc tuning as the heads are baically the same
Snowface
10-12-04, 03:51 PM
ok.
1.2 / 1.3 have same Cathedral shape inlet ports which are better than the 1.4 Sr's Square Ports.
SRi head has round shape ports and is better than both of these.
1.2i and 1.4i have same bad square shape ports as 1.4sr head.
GSi has Round ports like Sri.
sri head is the one you want. it got me 12bhp just from changing the head
General Baxter
10-12-04, 05:58 PM
ok.
1.2 / 1.3 have same Cathedral shape inlet ports which are better than the 1.4 Sr's Square Ports.
SRi head has round shape ports and is better than both of these.
1.2i and 1.4i have same bad square shape ports as 1.4sr head.
GSi has Round ports like Sri.
GOD has spoken
happy now :lol:
Snowface
10-12-04, 06:12 PM
lol.
you could do a Cylinder Head Top Trumps to compliment the Novaload ones.
stats could be
# of Valves
Inlet shape
compression ratio
valve diameter
etc.
lol.
in that case then is there any difference between the sri and gsi heads ??
p.s. i am only going by what i have read on various websites
ollster
11-12-04, 11:48 AM
no they are the same head, a lot of the parts that are on the gsi are shared with the sri. the gsi may have larger valves in but i am not sure about that
Snowface
11-12-04, 12:24 PM
and obviously if you put a GSI/GTE head on an sri the compression ratio would drop.
so, ur all saying that, if i put my T40's on a SRi head then it'll give me MORE power? :twisted:
and, also add the NOS kit demon tweeks stock for carb'd motor's? :D
doesnt the sri head have all the hole's etc for the injectors tho? if so, how do i block 'em up?
Snowface
11-12-04, 12:42 PM
doesnt the sri head have all the hole's etc for the injectors tho? if so, how do i block 'em up?
you mean the inlet holes? If you block them up mate your car won't run at all. Thats where your T40 manifold bolt onto.
so, ur all saying that, if i put my T40's on a SRi head then it'll give me MORE power? :twisted:
and, also add the NOS kit demon tweeks stock for carb'd motor's? :D
doesnt the sri head have all the hole's etc for the injectors tho? if so, how do i block 'em up?
holes for the injectors are on the inlet manifold. you get a new maniflod with the 40's anyway so dont need to worry about the injector holes. go on, indulge in some direct port noz :D stady 25-50bhp shot should be ok with a controller 8)
Aragorn
11-12-04, 12:43 PM
the gsi and sri heads are listed as different part numbers so they may have a different clearnace volume too
and the injector holes are on hte inlet manifold ;)
well, me with my excellent spannering/welding skills. im sure that ill get the SR T40 inlet onto the SRi head! :lol:
so, will i be the first to have a T40'd + NOS'd 1.4SR on the site, or has ne1 else got 1? :|
oh yeah, anybody got sum mahhooosive brakes i could by? ill need em! :lol:
Snowface
11-12-04, 06:39 PM
cool. how you planning on settin gthe Nos up with the T40's?
an injector for each inlet?
so, will i be the first to have a T40'd + NOS'd 1.4SR on the site, or has ne1 else got 1? :|
your gonna have to be quick :wink:
well, me with my excellent spannering/welding skills. im sure that ill get the SR T40 inlet onto the SRi head! :lol:
the manifold will fit but the port's won't line up. skoob has a brand new sri inlet manifold for sale i think he want's ?100, other than that get a sri inlet manifold gasket and match your manifold to it using a dremel
cool. how you planning on settin gthe Nos up with the T40's?
an injector for each inlet?
he's probably not thought about this and will just buy the tweek's kit. but you have to drill and tap the manifold on each port, and fit the injector's to it, so you will have 4x fuel and 4x nitrous line's to join in to 1 then into the solinoids then back to the bottle
this is a pug 205 1.9 GTi on t-40 dellorto's and nos.
http://img.photobucket.com/albums/v626/j829nick/IMG_0498.jpg
you can see the four nos lines and for fuels lines going into each port on the inlet manifold, then they trace back to one.
doesn't look too complicated, just gotta drill and tap the manifold which i guess needs to be done quite precisely (to maintain gas tight e.t.c)
how much are the carb kits ?i might stick 20hp jets on my 1.6
Snowface
12-12-04, 10:45 AM
cool. whats the difference between red and blue? Wet and dry?
both of the nos caps look the same.
Isn't the red fuel ? and the Blue nos ?
if you trace back to the nos caps, there is a large metal hose going to the red lines, this is the same metal hosing that fuels the carbs, and the blue lines are supplied by a thiner hosing !?
maybe they are wet and dry ?
or is progressive injection ?
Snowface
12-12-04, 08:10 PM
so he's squirting fuel in ontop of the carbureted mixture along side the N2O to richen it up a bit.
i think so, otherwise it'd run too lean whilst the nos is being injected ?
thus ruining lean at the point where he's trying to create a burst of power .
altho wouldn't that double the flow through his head !? Carburated mixture + Nos/fuel mixture ?
The nos+fuel will be controlled anyway, by something equivalent to an ECU ?
it's quite a simple system really. i'm gonna try something like that on mine.
v.nice car, was at max power live. he was a complete prick tho, stuck up his own arse.
jon_boy
13-12-04, 02:33 PM
i thought you could basically fire a load of NOZ down and you put the extra fuel in to richen it up otherwise it burns too hot and melts stuff. a compromise off keeping it cool enough but still retaining enough bang.
Nitrous is very simple. It is injected to raise compression. It is basically really cold oxygen so will give a bigger 'BANG'. The extra fuel is added to stop the engine running too lean and melting piston etc. The ratio (jet sizes) between the fuel and nitrous (it is nitrous not NOS or NOZ. NOS is actually short for Nitrous Oxide Systems in the USA) is critical. Leave it to the experts, unless you fancy carrying out rebuild regular. I dont know who it is but he is on RoyBacer, he showed us how good nitrous is when used properly on a standard C20XE that was running standard LET times IIRC
Chris
ta chris...
the guy who owned the pug said with a solid engine build to start of with, he has had no problems running it. (he even admitted that the engine isn't that high spec'd in the grand scheme of things)
I've contacted a specialist and he's told me that if i hav enough cash to get exactly what you said chirs, done properly then on a well built c16se it should handle it all.
I was looking for something unique, so it looks like it's gonna be a c16se NT40 :-)
+ it's bloody cheap to get done compared to a good 1.6 turbo conversion.
Only bad thing is that you don't get the benefit 24/7. And i'd never use it on public roads.
but the again, i'd say you'd be replacing parts alot less often with a well setup nos system compared to a cheap turbo conversion.
Take neil for example, obviously his was a damn good engine, and proabbly spent alot of money onit, it still went pop tho...
rite, i had a Tinker with the old SR today, and it seams that i alerady have an SRi cylinder head (among other things?) :|
my plan is, NOS kit from demon tweeks, bolt on my weber's once ive matched up the gasket's etc.
each "arm" of the inlet manifld will be tap to a 12mm fine thread to accomodate a NOS injector, then rig it all up and get it R/R'd (fund's permitting of course, cuz im moving house soon!) :P
oh, and i want a purge kit for sure! :D
Engine rebuild...
Progressive injection/boost control...
Pro set-up costs.....
bottle heater.....
it's not as easy as it first looks....
i've worked out that basically a 2 stage system with progressive boost control (could see up to 50+bhp on a 1.6) is an essential unless your running aseriously top-notch engine. Should keep you away from rebuilds.
but to me ?1000 seems a good price for reliable turbo performance at the flick of a switch
Lets just get a point clear. Nitrous oxide injection isnt illegal on a road car. The points are IIRC you are not allowed pressurised gas lines IN the vehicle, and you insurance must be told
Chris
insurance aint a problem, its either NOS+T40's or a nice spanky escort cossie! :twisted:
Reckon a X14/16XE head is the way to extract real power :lol:
lol i know what i'd rather have between a standard 1.4sr on some 15hp nos jets, and a escort cosworth. lmao
+ i've got it priced up..
a progressive injection controller,that would allow you to program a sort of 2 stage system through 1 line is roughly about ?500'ish.. that'l give you a rough idea about what it Actually totals up to
+ the cheap kits don't come with a controlling system that automatically alters the mixture with changing bottle pressures.
well, my engine went BOOM BOOM, but ive managed to get a new 1 already!
?120 for a 1.4SR lump, rebuilt 5k ago, 83bhp @ the wheels with graph's to prove + free fitting! :D
all i got to do is bolt on me weber's and a new exhaust system, then its job done!
shud be a rite pocket rocket considering it's all striped out aswell?
Snowface
19-12-04, 09:14 PM
why did your engine go 'Boom Boom'? :?
were u messing about with Nos?
:lol: messing woth NOS, that wont be till after crimbo!
nah, its started to run on 3 cylinder's and sounded like a chevvy V8! :lol:
then it sounded like a huge bomb exploding, POW!!
i was miles from home and needed to get back b4 it gave up the ghost, just round corner from home, kapow! :|
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