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View Full Version : highly modded 2.6's ? pref carbi's?



_stonesour_
22-02-2007, 08:22 PM
sup,

looks like im offing the silvia as my project and getting a sigma as a daily car for now and then make it my new project once i have my magna sussed,

i LOOOOOOOOOOOOOVE modded NA 4 cylinder engines , i think there is nothing cooler than hearing one lump off its guts as if it was a ported rotor.

so my question is since u guys use same engine as the sigmas, what have u found works ? (specially for the carbi engines)

im looking at head work ( done by me ..........(this is a project car and a learn as i go sort of thing so thus why i do it myself)

crazy cam spec

carbi upgrades ( im very ignorant with these never owned a carbi car)

and the usual exhaust upgrades

what have u guys found

what sort of power have any of u put out as a result of these mods ( if applicable)

... thanx

Mrmacomouto
22-02-2007, 08:27 PM
Regular servicing and good breathing mods.

_stonesour_
22-02-2007, 08:29 PM
oh and any websites u can link me to will be great.

please note im not looking for a full rebuilt engine story or anything like that just the generall stuff i listed above

BCX7
22-02-2007, 09:13 PM
i got a nuts cam, extractors, about to put on another carby (for cost, cant go past a rejetted 32/36 weber from a falcon) - however many others will fit. also looking into shaving the head and port/polish too - maybe even new valve springs. Remove the balanceshafts if you want the motor to rev a bit easier.

i have a spare cam for a sigma/scorpion thats my mates... not sure if he wants to sell it, but i can certainly ask him.

electronic ingnition would be another one to look into. you wont have problems with setting Dwell, points. you'll be able to use a magna dizzy. i have a spare one that i dont want. has a brand new vac advance unit on it.

you got me on msn, but i never talk to ya. Willing to show ya photos,e tc of whatever you wanna know.

Fulysig, madlante and i converted Fulysig's GK sigma to EFI. it's not hard to do that either.

_stonesour_
22-02-2007, 09:27 PM
thanx bud,

i havnt even got the car yet just got one lined up.

not really keen on going efi or anything,

just want to get a very crazyh cam profile, carbi mods, and head work plus the usual crap.

reason being is im after a good cheap car i can play with that i can use for hill climbs and track days , and also is relatively easy n cheap to mod.

obviously i want a sprinter but ill have to get over that, also looking at ke70 (4age) escort or sigma, though i have a siggy lined up and yeah i do like them quite alot

have been doing a bit of research on other forums but they seem to be ran by mostly 15 year olds who just ges lol ...either that or the sigma forums are ruled by the turbo's so info is hard to come by .. however i know there are some 2.6's up around 100kws atws thats damn kool!

_stonesour_
24-02-2007, 09:05 AM
surely some of u know enough about ur engines to give a bit of advice here?

Mrmacomouto
24-02-2007, 10:09 AM
Take it out and put a VR4 engine in there.

D@ve
24-02-2007, 11:10 AM
well bore it out, cams, port polish, extractors, CAI, falcon webber carbie, anything to make it run easier. (lighter parts = easy to turn parts = less power lost thru turning parts) work off that and you'll figure out what will help most.

Got any questions about specific areas and you'll get a better response usually

_stonesour_
24-02-2007, 02:27 PM
Take it out and put a VR4 engine in there.


for what purpose exactly ? i want to build a tuff na 4 cyl where the engine is cheap and i can play with it myself and not worry bout **** ups..



Got any questions about specific areas and you'll get a better response usually
im specifically asking for ppls experiences with modding the engines and things they have found

BCX7
24-02-2007, 03:23 PM
The removal of the balance shafts allows the motor to rev a bit more free... also will rev out to 5-6k.

Cam traded a bit of bottom end torque for power in the high end, also my Astron will now haul up to 6.5k. depends on your cam profile though. mine is symmetrical for both intake and exhaust. without giving spec away, i have quite a lot more advance and lift, i am also running sigma lifters rather than the hydralic ones.

Extractors gave me back a bit of that torque loss low end, and added a bit onto the high end... in general it added a bit of pull across the whole range.

Wacking a carby magna ingition system will elimate problems with dwell timings. with points, the higher the rpm, the shorter the pulses to charge up the coil - the spark gets weaker. magna dizzy uses electronic circuitry to ensure dwell angle is kept the same and uses hall effect so there is never a need to replace points. this is what the kingswood/torana boys do... they pinch the dizzys from the commodore blue motor and wack them on their red motors for the same reason.

Carby - i'm yet to do... i gotta clear this defect - regency jobby for tint!! (maybe you can give me some pointers to what they look for :P)

overall, my 4cyl carby automatic magna keeps up with my mates 5spd rb30 powered r31.

Sigmaproject
26-02-2007, 11:50 AM
In the long run it is probably quicker and cheaper to just do this:D

http://img155.imageshack.us/img155/3818/pvcvalve1ft8.jpg (http://imageshack.us)

Also, all Sigma's from 82 onwards had electronic Ignition

_stonesour_
26-02-2007, 06:24 PM
The removal of the balance shafts allows the motor to rev a bit more free... also will rev out to 5-6k.

Cam traded a bit of bottom end torque for power in the high end, also my Astron will now haul up to 6.5k. depends on your cam profile though. mine is symmetrical for both intake and exhaust. without giving spec away, i have quite a lot more advance and lift, i am also running sigma lifters rather than the hydralic ones.

Extractors gave me back a bit of that torque loss low end, and added a bit onto the high end... in general it added a bit of pull across the whole range.

Wacking a carby magna ingition system will elimate problems with dwell timings. with points, the higher the rpm, the shorter the pulses to charge up the coil - the spark gets weaker. magna dizzy uses electronic circuitry to ensure dwell angle is kept the same and uses hall effect so there is never a need to replace points. this is what the kingswood/torana boys do... they pinch the dizzys from the commodore blue motor and wack them on their red motors for the same reason.

Carby - i'm yet to do... i gotta clear this defect - regency jobby for tint!! (maybe you can give me some pointers to what they look for :P)

overall, my 4cyl carby automatic magna keeps up with my mates 5spd rb30 powered r31.

thanx mate i think ill definetely have to [chat with u when i get the car for some more info

_stonesour_
26-02-2007, 06:30 PM
In the long run it is probably quicker and cheaper to just do this:D

http://img155.imageshack.us/img155/3818/pvcvalve1ft8.jpg (http://imageshack.us)

Also, all Sigma's from 82 onwards had electronic Ignition

not at all , i have absolutely no urge to do it what so ever,

as i said in first post i ALREADY have a turebo car, im trying to get rid of it, i want to play with an NA 4cyl and build something i can take to motorkanas, track days etc.

Going turbno is just openi9ng up a whole can of worms im not i9nterested in, especially reliability, defects, driveability, DIY factor etc.

plus the sound of a bit of flutter or pssssssssssssshhhht might get 15 year olds a lil happy between the knees, but personally i think an NA 4cyl lumping like a rotor and reving off the dial is way way waaaaaaaaaay cooler lol

there are a few modded sigma's putting out between 100-120 kw's at the wheels with big mods but not CRAZY mods,


are there any astron websites anyone has links to ? i may find them interesting

_stonesour_
26-02-2007, 06:30 PM
In the long run it is probably quicker and cheaper to just do this:D

http://img155.imageshack.us/img155/3818/pvcvalve1ft8.jpg (http://imageshack.us)

Also, all Sigma's from 82 onwards had electronic Ignition

not at all , i have absolutely no urge to do it what so ever,

as i said in first post i ALREADY have a turebo car, im trying to get rid of it, i want to play with an NA 4cyl and build something i can take to motorkanas, track days etc.

Going turbno is just openi9ng up a whole can of worms im not i9nterested in, especially reliability, defects, driveability, DIY factor etc.

plus the sound of a bit of flutter or pssssssssssssshhhht might get 15 year olds a lil happy between the knees, but personally i think an NA 4cyl lumping like a rotor and reving off the dial is way way waaaaaaaaaay cooler lol

there are a few modded sigma's putting out between 100-120 kw's at the wheels with big mods but not CRAZY mods,


are there any astron websites anyone has links to ? i may find them interesting

Mrmacomouto
26-02-2007, 07:54 PM
www.astron2.com used to be good, havn't checked back in a while.