I was considering a turbo 4 my TP to get that extra power that everyone wants, but after looking at the cost of parts, installation, testing, approval, insurance and fuel, I thought nah. The only other thing I can think of for a bit more power is a bigger camshaft. Has anyone done this mod to their Magna? How did it go, and where did you go/what brand/what size cam?

Im sure this will use more fuel, but it cant be that much more could it?

Im looking for more power between 2000 and 4000.

BTW I have a TS engine, extractors, 41/46mm Dual webber, 2.5" pipe, oversize rockers.

Thanx

i think a Mild Cam will suit in nicely. u can get these from Crow Cams for around $275-$300 im pretty sure. it will keep the same amount of torque etc down low but it will not die in the ass at 5000rpm like the stock cam does. the mild cam will pull ALL the way to 6000 :D u wont wanna change gears wen its in.

i just had my stock cam reground to mild cam specs. its still a mild cam though, but with the self adjusting tappets etc the car has, they will not adjust enough and so are noisy. this can be fixed with a set of manually adjustable rocker gear from a sigma. i KNOW that the sigmas rocker gear fits and works perfect because i researched it and asked a few ppl around the place that had sigmas etc. $140 it was to get the cam reground to mild cam specs through REPCO ($20 was postage cause it was done in brisbane) i dont know how much the sigma rocker gear is.

hope this helps,

brendan

just some extra info here - if u wanna go larger than a mild cam, u gotta get stronger valve springs, and maybe a new cam gear if u go really lumpy.

maybe roller rockets would be a good thing to get aswell - they basically have little rollers on them where they rub against the camshaft when it rotates, so it reduces alot of the friction u get... and they have little wheels somewhere else on em aswell that i forgot.. something to do with the tappets.

but generally as tm-se-red said, the larger u go the more the power band is focused on the high end of the rev range. :)

check with your insurance mob cause if your young like me they think your a wanker and wont let you do it.

Its not really something the inspection guy would pick out if u ever had a crash. :badgrin:

Thanx heaps for the help!

The rockers have already been done before I got it, I think they are out of the 3L...I'll have to check. I think I'll just go for a mild set-up. Should this decrease my fuel econ much? I get about 300km to $55 at the moment, which isnt too bad but if its gonna be getting near the 200km mark I wont do it.

What is involved in swapping the cams over & roughly how long should it take? (I'll get my mechanic to do it)

Also, roughly how much of a power gain at the fly should I expect, and at roughly what revs will it start to become noticeable? (I know its hard to say without knowing the exact specs but im just after a rough estimate)

Does anyone know a part number for a suitable crow-cam so I can just go down to Rice-barn and order one, if I decide to go ahead. I would get it re-ground but I cant be without the car for more than a day and I cant let my old man know, U know how it is.

After a new cam, what else would give me more power?...bescides the whole forced induction deal.

Thanx heaps for the help!

The rockers have already been done before I got it, I think they are out of the 3L...I'll have to check. I think I'll just go for a mild set-up. Should this decrease my fuel econ much? I get about 300km to $55 at the moment, which isnt too bad but if its gonna be getting near the 200km mark I wont do it.

What is involved in swapping the cams over & roughly how long should it take? (I'll get my mechanic to do it)

Also, roughly how much of a power gain at the fly should I expect, and at roughly what revs will it start to become noticeable? (I know its hard to say without knowing the exact specs but im just after a rough estimate)

Does anyone know a part number for a suitable crow-cam so I can just go down to Rice-barn and order one, if I decide to go ahead. I would get it re-ground but I cant be without the car for more than a day and I cant let my old man know, U know how it is.

After a new cam, what else would give me more power?...bescides the whole forced induction deal.


1. a mild cam will give u slightly worse fuel economy. not enough to only give u 200km to almost a full tank.

2. attached, i have a "How-To" on changing the cams over.

3. the mild cam will see u with increases between the 2000rpm and the 5000rpm mark. with the mild cam in my car, it kept pulling ALL the way to 6000rpm. it dosent die in the ass at 5000 like the stock cam does. in regards to how many kw at the fly u will recieve from it, i dun think u will c too much power from it. a cam just lets the engine rev out further so u can gain all the power out of ur other mods (exhaust, carbs etc). i think the mild cam will SLIGHTLY increase ur redline too. nothing noticeable, maybe 6300 but that means u can hit redline and feel safe ur cam can handle the go. wen u have it in ur car, trust me, u wont wanna change until 6000!

4. from the crow cams website -


part no. = 1087292
power range = 2000-5000
comments = Mild cam for use in engines with hydraulic lash adjusters. To april 1991.

the other specs of the cam (lift/duration) can be seen here (http://www.crowcams.com.au/templates/Catalogue-Sigma-OHC.shtml)

5. ya want extra power? u have done a fair few mods already but let me give u ideas on future mods :D

A. increase compression. yes, the TS engine already has 9.0:1 CR but hey, the higher it is, the better fuel economy u get and the more torque u get. downside may be that if u go TOO far, it will ping on unleaded meaning u HAVE to run premium at least

B. head work. this could include the increase in CR too. get ur head port and polished. flow is wat u want and the heavier its ported and polished, the better it will b for performance.

C. flowed manifolds. make sure that the manifolds are flowed properly etc. as per the head work, flow is wat u want to make the most out of the work u have already done.

thats all i can think of at the moment without getting too expensive. hope this all helps. hey yeah, i better attack that thing.

brendan

p.s. instead of attaching the file again, here is the link.

How To Change Cam (http://www.aussiemagna.com/forums/showthread.php?t=9787)

you get 300's to a full tank? i get atleast 500 and with the way i drive that could be improved upon but tell us how the cam goes, i've always wanted to put one in to give the engine a bit more length in the revs but just never have, the ECI needs its ECU piggybacked to handle with it doesnt it?



insurance: its not that they'll punish you for not telling them, its that once the car is crashed and they pay you out for a total you dont get your cam back, or if the block has to be changed you then dont get the 200-300 smackers for the cam.

you get 300's to a full tank? i get atleast 500 and with the way i drive that could be improved upon but tell us how the cam goes, i've always wanted to put one in to give the engine a bit more length in the revs but just never have, the ECI needs its ECU piggybacked to handle with it doesnt it?


i have been led to believe u need a piggyback to handle the cam. if u have a look at the crow cams site i posted up in my last post in here, u will c that it says that the cams do not work with an efi car. u could contact Crow to find out exactly why.

Thanx heaps Brendan! That helps ALOT. Higher compression eh, I already run on premium, runs like poo on regular. How do you go about raising the CR?

The Crow-cam site says that the cam suits the Astron II up untill April 91', my engine was made after that, should it still fit?

I already run on premium, runs like poo on regular.
amen to that lol

premium is much better

Thanx heaps Brendan! That helps ALOT. Higher compression eh, I already run on premium, runs like poo on regular. How do you go about raising the CR?

The Crow-cam site says that the cam suits the Astron II up untill April 91', my engine was made after that, should it still fit?


runs like crap on regular? does it ping? if it dosent ping (no predetonation) then u could still run regular.

to raise the CR, u can do a few things. lower compression pistons (i think, havent really gone into this with my car as yet) OR, u can do wat i did and get some shaved off the head. i got 10 thou shaved off my head and it made a difference for sure. i could still run on regular to which was good. u may wanna try to take more off, maybe 15-20 thou? ya just dont want ya valves going through a piston :confused: ... thats the thing u have to watch for wen shaving the head.

a tip, if u wanna get the most out of running premium, set ur timing to b able to run it. then u will c gains from it.

im not sure if the cam will fit into the TS engine. u sure u have the TS engine with the 12 valves? if u have the 12 valves then no, that crow cam will not b suited for u as it only has the lobes on the camshaft to run the 8 valves :D

im not sure if the cam will fit into the TS engine. u sure u have the TS engine with the 12 valves? if u have the 12 valves then no, that crow cam will not b suited for u as it only has the lobes on the camshaft to run the 8 valves :D
TS 2.6's im sure only had 8 as all the gen1s

to raise the CR, u can do a few things. lower compression pistons

Spot the wrong word. ^^^

Yeah shes tuned to run on premium, it was tuned for regular but it never ran right. Runs perfectly now.

Lower compression pistons for a higher compression? hmmm

I think its the 8valve...have to check that one.

How much does 10thou raise the compression by?

Spot the wrong word. ^^^


obviously a mistake. higher compression it was meant to be.

the 12 valve TS was the 6 cyl

no idea how much 10 thou raises compression by.