Outer Limits 4x4 Board

hi, ive been reading around and people have been talking about changing the cams in the td42. i dont understand looking at it, it doesnt look like the cam (s) you would see in a petrol. can you even get cams for a diesel?

Yes can be done with good results. There is a guy down here who does a good job. Cannot think of his name but get the cam linished aswell. Some one else will know who he is.

Cris

have heard of this being done before (re-grinds) more interested in a complete new cam to drop in tho...
be good to see what comes up bout TD42 cam work

PGS do (get done) a good cam re-grind, but it requires new valve springs. I have not heard of billet cams for the td42.

www.tighecams.com.au Found it.

Cris

Sorry to Hijack but i would like to know one thing, heard of swapping cams between TB42 and TD42 that it can be done

1 thing makes me wonder how

the Firing order (according to the books) of the GQ TB42 is 1-5-3-6-2-4.

The Firing Order (according to the Books) of a GQ TD42 is 1-4-2-6-3-5

Now if this is the case, the cam lobes would be in the wrong positions when swapping between the 2 motors.

gudday fellas

Kelford cams in Christchurch NZ does one specifically for Hot TD42T's
From memory they are reasonably cheap with or without a cam exchange.
As soon as the need arises for 'surgery' on my engine ones going in.

Another option for those who don't want to go too radical you can put a NA TD42 cam in a TD42T and there is more lift.

regards Garth

has anyone on here changed their cam on td42? would be keen to know if it makes much difference

dzltec also does a cam for these i believe

We have used a Ivan Tighe cam . Great service and he know his stuff. We also got the motor balanced and it went like the clappers. The motor is now in a GQ patrol as Dave came across a motor that he could not resist.

Cris

MyGQ wrote:Sorry to Hijack but i would like to know one thing, heard of swapping cams between TB42 and TD42 that it can be done

1 thing makes me wonder how

the Firing order (according to the books) of the GQ TB42 is 1-5-3-6-2-4.

The Firing Order (according to the Books) of a GQ TD42 is 1-4-2-6-3-5

Now if this is the case, the cam lobes would be in the wrong positions when swapping between the 2 motors.

Just swop the spark plug leads on the diesel to suit the new firing order...

the profiles for a td42 and Tb42 are almost identical, the cams, themselves I don't think interchange from memory due to the front drive setup. We do a grind of our own, as per most it is a changeover basis as new billets are expensive, you can get one from a wrecker. The cost depends on the condition of the cam and lifters as you should always get the lifters faced as well. Sometimes if a cam is worn on some lobes they need to be built up with metal spray befor grinding, the number of lobes effects the cost.

Joel

for those who have had cam work done on their td42. what sort of money is 'reasonably cheap'??

i realise this will change a lot depending on what gets done, just interested in something just without anything to fancy, that could be run in a more basic td42 without too many mods.

...if that made any sense?

Has anyone put a N/A td42 cam into a td42t gu motor? If so what gains did you get if any

PGS 4WD wrote:the profiles for a td42 and Tb42 are almost identical, the cams, themselves I don't think interchange from memory due to the front drive setup. We do a grind of our own, as per most it is a changeover basis as new billets are expensive, you can get one from a wrecker. The cost depends on the condition of the cam and lifters as you should always get the lifters faced as well. Sometimes if a cam is worn on some lobes they need to be built up with metal spray befor grinding, the number of lobes effects the cost.

Joel

Thanks Joel,
I spoke to you recently re upgrade for GU 4.2.... we were talking (1) front mounts and (2) bb turbo's.

However, you didnt mention cams. (?)

All things being equal, would a cam upgrade provide a better 'bang for buck' over 1 or 2 above? or be considered step 3? Would a cam on its own (lets assume std turbo etc) provide... 10kw? 10nm? More drivability? Or would it move power up the range (dont see how given no overlap and mainly increase in lift) and create more lag down low?

Either way IIRC turbos like high lift, medium duration with minimal overlap, so i assume thats where the NA TD cam would improve things.

Personally I'd only bother with the cam a if I were doing a rebuild, the output acheivable without a cam is realistically above the safe capacity of a stock engine, do the cam when you build the engine for big.

Joel