I want to change cam on my 4.3, what do you recomand?

[SILICONEKID345HP]

gmw9666 said:

Just dropping in from the wedge side.....hi

I've got a 234 cam in my wedge.....and quite frankly drives spot on, I can drive through town not issues a real joy at all speed.......and she goes like s£$t off a stick = 287.6 BHP at 5794 RPM with 281.3 ft lb at 4811 RPM. In my view its all about the set up. Just my 2 cents :-)

Video of rolling road set up = http://s1354.photobucket.com/user/gmw9666/media/IM...

Engine Spec
4441cc
HRC Conrods
234 Cam
Jaguar AFM
Jaguar Injectors
Big Valve - Ported and Polished Head
Standard Inlet Manifold / 38mm with shortened 45mm trumpets
JE 80mm Crank (number 897)
JE 4.5 Pistons
Bore 93.5
Stroke 80mm
NCK 72mm Throttle Body / Plenum
Standard timing chain, cam followers, push rods
Bronze Valve guides & Dual Valve springs
8.5 Head Gasket / 10.619 CR
Mark Adams rebuilt ECU / AFM and rolling road set up by MA
Smooth bore Silicone Elbow and Ram Air Filter

Edited by gmw9666 on Tuesday 31st March 11:37

Qbee might let you in the MMC if you ask him nicely .

Edited by SILICONEKID345HP on Tuesday 31st March 11:57

[domV8]

Bobby Shaftoe said:

Chuffmeister said:

That's interesting. In the above list of cams, the H218 is promoted as good midrange, poor BHP. Whereas the stealth is good BHP. 'Poor' and 'good' can mean different things to different people, however, from what you're saying, this chart could be a little misleading?

The terms good/poor are all a bit subjective anyway, if you take a look at peoples dyno charts for both the road Stealth and the H218, peak torque is at 3500-4000rpm and peak power is all done by 5000-5500rpm. The trackday stealth is peak torque at 4400ish or more and a much longer rev range. Head porting, valve sizes, compression ratio increases would make more difference than swapping between the Stealth Road and the H218 imho.

This has been my experience too...

Keeping the same TVR885 cam - switching heads from standard TVR 4.6 BV (AKA "4.6 HC" according to a previous post by Rob) to a Pete Burgess-worked set I got from Derek shifted the peak torque point about 6-700rpm further up the rev range, extending the torque band width about 1000rpm past where the original heads became restrictive...

In my experience cam profiles and headwork are linked in terms of the effect they have on where peak torque occurs...

HTH,


Dom

[Mr Haribo]

On my post and many others talked about you may need pocketed pistons etc
Check with V8 Developments Rob is a good man to talk too !
I have had a 214 or 218 piper cam, not that good if im honest but didnt need any extra work just timing !

[gmw9666]

Bobby Shaftoe said:

That's interesting, do you have a dyno chart you could post up? Do you know which 234 or it was, there are 234's available from Real Steel, Kent, Crower, Keford & Crane with all slightly different specs. Mine was the Kent and it didn't come on cam to until 4000rpm, the crower in comparison had a much broader power band but made pretty much the same peak.

Edited by Bobby Shaftoe on Tuesday 31st March 17:15

Hi there, don't know the make just know its a 234 from the spec sheet when JE did a rebuild back in the 90's (18k ago)

Here's the dyno graph.......sorry its a pic from the day vs the print out don't have that on this PC

[Chuffmeister]

domV8 said:

Bobby Shaftoe said:

Chuffmeister said:

That's interesting. In the above list of cams, the H218 is promoted as good midrange, poor BHP. Whereas the stealth is good BHP. 'Poor' and 'good' can mean different things to different people, however, from what you're saying, this chart could be a little misleading?

The terms good/poor are all a bit subjective anyway, if you take a look at peoples dyno charts for both the road Stealth and the H218, peak torque is at 3500-4000rpm and peak power is all done by 5000-5500rpm. The trackday stealth is peak torque at 4400ish or more and a much longer rev range. Head porting, valve sizes, compression ratio increases would make more difference than swapping between the Stealth Road and the H218 imho.

This has been my experience too...

Keeping the same TVR885 cam - switching heads from standard TVR 4.6 BV (AKA "4.6 HC" according to a previous post by Rob) to a Pete Burgess-worked set I got from Derek shifted the peak torque point about 6-700rpm further up the rev range, extending the torque band width about 1000rpm past where the original heads became restrictive...

In my experience cam profiles and headwork are linked in terms of the effect they have on where peak torque occurs...

HTH,

Dom

So basically, it wouldn't be worth me swapping my H218 fitted about 10k ago for a Stealth? I'll sortly be running a Canems ECU on my 500, so will have smooth bore, trumpets red top injectors etc. If tou were talking an extra 20HP for the cam, then it maybe worth it, but if it is likely to be just a few horses, then it certainly won't be.

[Cokes]

My cam was changed about 17,000 miles ago. I'm guessing something pretty standard went in (before my ownership) but does the part number mean anything to anyone ?



TE0180 ?

[Pupp]

blitzracing said:

Pupp said:

Yep, long overlap cams are the devil's work. Certainly don't try and pair one with a turbo

Or a 14CUX for that matter.

Err, I was being ironic

[Alexdaredevils]

I had a 248 solid cam in a 4.6 on 14cux with no problems or shunting

[SILICONEKID345HP]

What is a solid cam ?

[domV8]

Chuffmeister said:

So basically, it wouldn't be worth me swapping my H218 fitted about 10k ago for a Stealth? I'll sortly be running a Canems ECU on my 500, so will have smooth bore, trumpets red top injectors etc. If tou were talking an extra 20HP for the cam, then it maybe worth it, but if it is likely to be just a few horses, then it certainly won't be.

In my case, it appeared that my original heads were restricting the cams breathing higher up - so the extra volume in the ports allowed the cams full rev range to be opened up.

It did however mean (presumably) lower gas speeds through the heads at lower revs (larger volume), meaning I lost torque lower down - but this was a heads-related development, not cam-related.

If your heads are restrictive then fitting a cam which only comes "on-cam" higher up, could mean you actually got the worst of both worlds, lower torque down low due to the cam, with a short "on cam" experience due to restrictive heads...

I have NO EXPERIENCE with the Stealth cam, only the TVR885 - but you need to consider matching the rev band of optimum flow through the heads with the power band dictated by the cam profile.

If they are mismatched - then you won't get the best from the set-up.

HTH,


Dom