THOR high comp 4.6 camshaft

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Originally Posted by garrycol

Anyway the guy I spoke to is going to check with one of their client engine builders/tuners to see if they have issues and get back to me - but as usual the initial response is that we have never heard of this issue before.

Garry

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As expected the client engine builder has had no issues with the cam going into the RV8s. He reiterated that thye cam has to be dialled in - I indicated that I understand that but if the engine is other wise standard - standard crank/cam cogs, chain etc then what is there to dial in - it is either correct or not - anyway to do that I will have to pull the manifold and tin gasket off and that isn't going to happen anytime soon.

As I am going from a 3.5 to a 4.6 I am not really going to know if there is any issues.

Here is the cam information

Attachment 136065

Garry

I've seen a honda B16A dialed in,, took quite some time and if you are chasing the very last bit of HP is definately worth doing.
not sure any of us here is in that boat, maybe discoclax? [bigwhistle]

stuff explained here..
One of the least understood topics and regarding engine tuning and building continues to be the concept of cam timing and

G`day ,

non adjustable can be adjustable with help .

The card will give std set but can be altered

Advancing and retarding alters the revs of occurrence .

A cam not set other than dot to dot can give the same differences but without degrees it`s not known .

When you consider a cam the working revs for torque and HP are topics of note but the cam has to be set for them to have relevance

If it`s not a personal concern it doesn`t matter i don`t see the point without .


ADD
Most reasons for replacing a camshaft poor power poor torque poor economy etc can be achieved by not having a camshaft timed correctly .




Cam timing - Adjustable sprockets and keys

Hi

Given all the voodo here and the fact I have a Tornado chip installed, I think if I need to replace my cam when I replace my lifters, then I will fgo for a standard cam

Very interesting thread though [bigsmile1]

Steve

so i went for a standard 4.6 cam from tr spares in sydney. the result is impressive when comparing it to my LC gems car! i hadn't driven the thor car before the work - it was purchased with the heads off.

i think it might need an AFM though. and the coil springs someone has fitted are horrible and just about make the car unusable from a comfort perspective on the country roads around here. not sure how much of a factor the bigger rims are, again compared to the early car which is also on springs.

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Originally Posted by TheTree

Hi

Given all the voodo here and the fact I have a Tornado chip installed, I think if I need to replace my cam when I replace my lifters, then I will fgo for a standard cam

Very interesting thread though [bigsmile1]

Steve

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You could reverse engineer the cam[bighmmm],, why not email Mark and see what he reccomends for your ECM?

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Originally Posted by DiscoClax

General consensus is anything much above 0.43" at the valve may result in the retainer clouting the guide. It was around that in mine so I machined down the guide and seal area slightly for my higher lift cam. Springs are actually OK, you just run out of clearance there well before the springs would bind. Plus a"bigger" cam can overpower the stock springs...= floaty.

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So at 0.44 will I hear tapping or a single loud bang? [bighmmm]

I understand Floaty is a technical term,, but up high in the rev range? and it misses or revs funny?

I believe that the first contact will be between the top of the seal and the bottom of the spring retainer. That would be a soft hit and pretty quiet but would chew up the seal. A few thou (?) more would be metal to metal and not so good... bent pushrods, etc possible. Not sure what that would sound like but probably 'clattery' like pumped down lifters.
Valve float normally exhibits initially as a drop in power (valves staying a bit open bleeding off compression) but if pushed much further may end up eventually with valves clouting pistons. Yes, higher revs is where that'd happen. Dependent on springs and camshaft profile for when or if.

Well I've obviously had none of those so far,, and apart from the valve springs softening up over time I dont expect to change driving style much,,
I think there would be a lot of these cams out in the wild,,,

I've just been recommended the Crow 371771 for my modified 4.6L in a D2. After looking at the specs, the cam looks like it's milder than the stock 4.6 cam and a lot milder than the current Piper 270 that I've got in it now.

It's so confusing!!