vc 4cly starfire questions

[muffman001]

Hi all

I got a VC commodore with starfire motor for $150 (from famaly)
that has had a full recon motor put in it The body needs a little work nothing to hard

motor has only been driven 10,000km since the new motor + it has had work done to it like shaved head n stuff

and apparantly it has been bored out to the size of the 186 or 202 ? can that realy be done ?

but my main question is it has 13" rims and i have a nice set of 15" mags ive been told by a mate i could fit the front rotors off the 6cly and just use a rear diff from a 6 too

i can get a hold of VK diff and front rotors will these work ? or does it have to be from a VC

and what is the pro's and con's of doing this like gear ratios ect ect

EDIT: also can vk front and rear bumpers be fitted to the vc ? as i have a set of vk plastic bumpers laying around too

Thanks in advance

Muff

[leigh 7005]

i thought they would bolt up to the 4 cyl if not just use a 6cyl diff vk has 2 dif diffs salsbury and borg get the salsbury and you can put vk bumpers on i had them on my vh but you have to change the lights as for bore im prity sure you can bore that much still not a 186 202 as missing 2 cyls lol as for ratio im not sure but someone should be able to answer that.

[muffman001]

Nah they dont just bolt up apprarnetly they use a older torana stud patten as for the diff tho will the mounting points be the same ?

[leigh 7005]

mounting should be the same just have a look at one at the wreakers as the wheels just try bolting one up

[tigervh]

You'll have to use the 6cyl rotors, drums and rear axels. The starfires have the same bore as a 173. They cannot be bored to 186/202 bore size. The VK diff would be the better way to go. Fitting the 3.9:1 diff was a mistake by Holden as the starfires are torquers like the sixes. They don't like to rev.

[Calaber]

You'll have to use the 6cyl rotors, drums and rear axels. The starfires have the same bore as a 173. They cannot be bored to 186/202 bore size. The VK diff would be the better way to go. Fitting the 3.9:1 diff was a mistake by Holden as the starfires are torquers like the sixes. They don't like to rev.

I think you would also need to use the 6 cylinder front caliper mounting brackets, as the 4 cylinder discs were a smaller diameter and thickness than the 6 cylinder cars. Rear axles should swap straight in together with matching drums, as already pointed out. The low ratio (3.9:1) diff was used to help the low powered 4 cylinder engine to move the relatively heavy Commodore body around without being permanently embarrassed every time you took off. PUtting a higher ratio diff in will cause a loss of accelleration but gives lower engine speeds when cruising.

[tigervh]

PUtting a higher ratio diff in will cause a loss of accelleration but gives lower engine speeds when cruising.

Very true but not entirely so in the case of the 4cyl Commodore. As well as utilising a 3.9:1 diff ratio Holden also used the torque master gear box which had a very very low first gear. When coupled with the 3.9:1 diff 1st gear was almost like a granny gear in a truck. As soon as you moved off you had to shift to second. Fitting a taller diff makes 1st gear a lot more useable and actually improves acelleration off the line by delaying the shift into second.

My first car was a 4cyl VC. Changing the diff to a 3.36:1 was the best modification I ever did to that car. The difference it made to the performance was amazing.

[muffman001]

Thaught i would put up some pics of the beast

bargin for $150 recon motor only done 10,000km

has sat for the last 5 years so it needs a dam good clean !!


EDIT: window wipers dont work ... i know these type of commodores have probs with the indercator stalk could this be a cause or would the wiper motor be dead ? should i just run 12v directly to the wiper motor to test if its dead or is it lower than 12v ?

thanks for all your help im now just thinking stuff the change just for 15" rims altho diffrent diff sounds better ... prob just end up with some old school mags off a torrie or early holden

[muffman001]

Holden also used the torque master gear box which had a very very low first gear. When coupled with the 3.9:1 diff 1st gear was almost like a granny gear in a truck. As soon as you moved off you had to shift to second..

Moved it after it sitting 5 years took off up the road and your dead right 1st gear is almost a crawler gear

another question for you all

i got told by the person i got it off that you have to push down on the gearstick to get it into rev (like the old cameras) ... and rev is were 1st is but when driving it home i found out that you dont have to push the gear stick down before going into rev ... found out the hardway ended up facing the way i was coming from is that just some sort of selecter broken or is that internal in the gearbox ?? because it is dangrous as hell

thanks in advance




Muff

[TUF UTE]

u .... locked the box with reverse... while driving .....


didnt the crunching/ difficulty getting into gear/ car shuddering and locking when u started releasing clutch give it away ?

[tigervh]

I believe the reverse lockout is achieved by a spring mechanism on the gear lever. The box has an internal shifter so that won't be the problem.