i just put my mild cam back in 2nite with some help from turbo_charade and it goes SO much better!

anyway, wat this thread is about is that previously i have said that u NEED sigma manually adjustable rocker gear if u want to put a reground cam into ur engine.

NOT TOTALLY CORRECT

u can get a cam reground and slot it straight in and the tappets are able to adjust enough. if they are still very noisy after at least 1 day of driving, this means that u should get ur rocker gear reconditioned, including tappets. they can adjust fine!!!

wen u put the cam in, take it for a short drive and drive at like 40 in 1st for say 30 metres to get oil pressure up and in and around the tappets giving them time to adjust etc. DON"T HAMMER THE CAR AROUND AS SOON AS U PUT THE CAM IN

after abit of slowish, high revving driving for oil pressure, stop and listen for tappets. if they have adjusted enough, then give it a slight hit. just b patient with it and dont smash it too much too early.

so for $140, u can have a mild cam in ur car.

brendan

Carby only, or will the grind work on the superior EFI?

hey,

if i have $150 lying around, i'll do it to mine... (trying to gather up $300 for paint) but i just got a few questions:

what benefits of the reground cam? fuel economy?
much more powerful?
better throttle response?
can the motor still run off unleaded or does it need PULP? (ie. pinging)

Cheers,
Bill

hey,

if i have $150 lying around, i'll do it to mine... (trying to gather up $300 for paint) but i just got a few questions:

what benefits of the reground cam? fuel economy?
much more powerful?
better throttle response?
can the motor still run off unleaded or does it need PULP? (ie. pinging)

Cheers,
Bill

not totally sure if the cam will run in the EFI cars. give it a go, couldnt hurt it if left on for alittle while to c.

fuel economy: will go down very slightly. this is because the extra lift means extra fuel is going in. but it still depends on how much the foot gets put down

much more powerful: a cam wont really increase power by that much. it just lets more fuel in and more exhaust fumes out

better throttle respone: MUCH better. power on the stock car is around 2400 - 4800 (peak torque - peak power). with the cam its 2000-5800. so the car will feel alot more torquey and it will also want to pull to redline or there abouts. you will definately feel a difference. its a certain bet

fuel types: the engine will still be able to run on unleaded. its the timing you will have to change if u wanna run PULP. atm, i have my timing right forward and have PULP in the tank and still no signs of pinging. u will have to change the timing with the cam in, but not too far and not enough to make it ping on ULP

of course, if u want the most out of the cam u will need things like extractors, exhaust and cold air induction. u will still c a difference without these mods, but with them... it makes a world of difference!

brendan

Argh, my 3rd gen needs bloody cams badly... :rant:

hi,

great to see theres still some interest for modding 1st gens as i like the older style

where would i go to get a reground camshaft.
any numbers would be much appreciated.

i want to get a mild cam but dont want to spend $300+ for a stage1 cam from crow cams.

thanks.

hi,

great to see theres still some interest for modding 1st gens as i like the older style

where would i go to get a reground camshaft.
any numbers would be much appreciated.

i want to get a mild cam but dont want to spend $300+ for a stage1 cam from crow cams.

thanks.

take it to a repco machine shop with the specs for a mild cam. the specs can be found on the Crow Cams website under Sigma SOHC. look at each set of specs and i think it's the last set down the bottom. next to the specs it should say something like "suitable for cars with automatic lash adjusters to 91". something like that

im still interested in the cam for EFI but dont want to be the verginity breaker :) got quoted $50 to fit the cam after it was done may call for grind price tommorow anyone else care to try it 1st he he

i was going to get it done on efi and willing to try 2 months ago, had it all sussed, specs were diff to crow cams though. Then i needed the cash to go on holidays and since i've come back the car is no longer being modded as I have other interests, so, you first :cool:

still have the specs?

yeh mate tighe cams, i've heard good things about them so was going to go there. Maybe I will get it done eventually, but not anytime soon.

http://tighecams.com.au/profiles3/mitsubishisigma.htm

I'm pretty sure its the 746C grind with hydraulic tappets.

wait a sec.

So the cam will cost $150 and then $50 to get it installed ?? Thats damn cheap :) Also, i dont see why it wont work in the efi engines, wont the ecu adjust itself for it ? or is it a mechanical thing that is not compatible with the cam :confused:

cam cost me $120 to get done at a repco machine shop ($140 cause it had to get sent to brisbane) and y spend $50 to install it wen it's piss easy to do it anyway? can i also suggest trying to find some sigma adjustable rocker gear so that u know it will actually adjust enough. u won't have the horrid tappet noise either

im confused,

do i need to find me a cam, or buy one or use the one off my magna?

and then i guess i need a repco store?
the spec for the sigma OHC (that ive got off the crow cams site and saved on my desktop)?
and roughy $150 to pay repco for the machining?

you can get your one you have on the car now reground, to the different specifications

u can buy a whole new camshaft from crow or tighe or a cam company and these are around $300+

OR

u can get the stock cam u have in ur car right now reground to mild cam specs for around $120 if it dosent have to be posted anywhere to get done.

if u wanna regrind, these are the specs u want

Valve Timing: IN.23/57 EX.59/21
Duration: 260 260
.075" DUR.: 205 205
VALVE LIFT: .450" .450"
POWER RANGE: 2000 5800

Mild cam for use in engines with hydraulic lash adjusters. To april 1991

I wonder if the place that rebuilt my engine would do it for me because i think i still have warrenty on the engine :think:

thanks for clearing that up :)

do i need the "sigma adjustable rocker gear/s"?

I wonder if the place that rebuilt my engine would do it for me because i think i still have warrenty on the engine :think:

the cam will void the warranty, which is wat the mechanic said right after he installed my rebuilt engine.

no u don't NEED the sigma rocker gear. i don't have it and it still works fine, just the tappets are alittle noisy sometimes, mainly wen cold. but it is a good idea to get them.

hmm, whats better, pick-a-part or brand new from the store?

:redface:

confirmed it can be done to efi today price using different spec for efi was insane! $260 thats only downfall is i was told the motor would hunt at idle (go up and down in revs) and u may need to go bigger injectors & fuel pump if you do the stock ecu wont map correct.

for now ill think ill just go with new 2.25" system with commodore v6 cat for $280 fitted, seems the ecu kills the 1st gen efi with mods every time grr

pete

please make sureyou get a mandrell system.

he said he would have make the pipe sections as they dont do a prefab he wants me to go round and choose a muffler he said he has a few options so ill put it to him then

pete

confirmed it can be done to efi today price using different spec for efi was insane! $260 thats only downfall is i was told the motor would hunt at idle (go up and down in revs) and u may need to go bigger injectors & fuel pump if you do the stock ecu wont map correct.

for now ill think ill just go with new 2.25" system with commodore v6 cat for $280 fitted, seems the ecu kills the 1st gen efi with mods every time grr

pete
gees if i idles worse with a differnt cam i would hate to think how my car would idle then, its bad enough now
but good luck with it working with stock ecu if its going to hunt at idle its obviously picked up a falt making the revs hunt, as i have said a million times our ecus arent very tolirble what so ever it will end up causing more bad then good, and yer it wont hold up to bigger injectors or better fuel pump either

damn i love carby :cool:

damn i love carby :cool:

lol was wondering how long it would take

yeah seems carbi is the cost effective way of things, i was thinking whats the diff between 1st gen & 2nd gen 4cyl efi eg: airbox maf TB etc? would there be any gains to be had by grafting one to a 1st gen?

/me loves the fuel econ and reviness of efi :D

fuel econ .. ive heard about that.. dont think this model has it anymore :D i got the rev part tho

damn i love carby :cool:
damn straight - carbys are cool!!

nothing less than my old xf falcon 6 with turbo exhaust rev will satisfy me now :(

lol was wondering how long it would take

yeah seems carbi is the cost effective way of things, i was thinking whats the diff between 1st gen & 2nd gen 4cyl efi eg: airbox maf TB etc? would there be any gains to be had by grafting one to a 1st gen?

gains are to do with headwork mainly. the 2nd gen EFI cars have a compression ratio of 9:1 whereas all the carby (1st and 2nd gen) and the 1st gen EFI have CR's of 8.8:1. 2nd gen EFI have different timing chain assembly's and airbox setups i think too. i'm not too sure if anything else has changed like injectors etc... 1st gen EFI has 93kw at the engine and the 2nd gen EFI have 98kw at the engine (and anohter 100kg or so haha)

i know u can just get ur head and skim it say 15-20 thou, that will make the compression ratio abit higher, maybe even pretty close to 8.9 or 9:1. if u wanna do this though u might wanna look into water injection to make sure everything goes good.

higher CR = hotter engine
water injection = cooler engine
higher CR + water injection = happy engine

oh and mad... fuel economy and refinement with the EFI? refinement yes... but goddam all the 2.6L astrons love the fuel lol

didnt think about shaving the head wont mess the pain in the butt ecu up?

didnt think about shaving the head wont mess the pain in the butt ecu up?

probably lol

nah i don't see why. it won't changed ur air/fuel ratio which would stuff around with the ECU.
it's pretty much just trying to get the extra "oompfff" from each combustion. because ur using the same amount of fuel and air but just extracting more power from that, ur fuel economy will also be slightly better. sounds good, until u get it done and love the extra power too much NOT to put the foot down. damn fuel bill goes up for a week or so haha