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Cam Recommendation 

 

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 Post subject: Cam Recommendation
Posted: Thu Aug 09, 2018 4:34 pm 
Getting Side Ways
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Posts: 845

Joined: 1st Apr 2005

Gallery: 4 images

Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

I'm looking at stepping up my cam and am tossing up between:
Crow Cams billet 2222549 - 210/200*@.050 .530/.500 112*LSA
Custom regrind Wade 1673 - 206/198*@.050 .512/.484 113*LSA
Custom regrind Wade 977B - 206/206*@.050 .512/.512 112*LSA
On a custom regrind, I could go for a 114* LSA to make it more automatic-friendly. I would love to have a billet cam as it theoretically has more area for the same duration. And I don't want to over-cam and have a rubbish bottom end and throttle response.

My current cam is a:
Franklin regrind RH24B - 195/192*@.050 .503/.478 113*LSA

The car is an EF XR6 wagon with automatic:
- SS Inductions, 3" airbox exit, headers and cat delete, so easy breathing
- mildly-ported EF head
- 9.8:1 compression
- vernier cam gear, so can dial the cam in
- 3.45 LSD
- high-stall torque converter (2850rpm at current torque level)
- TI Performance J3 chip and tuning pack, so I can tune the ECU to the cam
The car is mostly a daily driver, but I do DYO drag racing over the summer.

What do you all recommend? Thanks heaps.

 

_________________

95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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 Post subject: Re: Cam Recommendation
Posted: Thu Aug 16, 2018 4:31 pm 
Getting Side Ways
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Posts: 845

Joined: 1st Apr 2005

Gallery: 4 images

Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

I have done some more research and checked out others' experiences, and I'm tending toward a Wade 1673 profile 206/198*, probably on 114*LSA.

My next question is whether to stay with the split pattern 206/198* or go with a single pattern 202/202* (same average duration). Falcon cams come in both split and single pattern, with no apparent reason for the difference. Can anyone tell me what differences would I notice between the two?

The split pattern, with its longer intake duration should theoretically have rougher idle, less vacuum and more induction noise. The shorter exhaust duration should reduce exhaust noise and probably hurt top end. Typical American V8s, with their poor wedge-head exhaust ports, normally have longer duration on the exhaust to compensate. The "reverse split" like in most Falcon cams is used in turbo engines to prevent exhaust gas reversion which reduces exhaust pressure and boost. But why would a Falcon six need that? Does the intake port need the help of the extra duration? If anything, the weak point in the E-series head is the exhaust port, so why not have longer exhaust duration? Just trying to make sense of all this.

Thanks.

 

_________________

95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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