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Vct And The Differences Between Ba, Bf And Fg Engines


Woznaldo

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  • Member For: 10y 10m 23d
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  • Location: South West Sydney

Evening All,

I've done a bit of a search but have had trouble finding anything concrete on what level of VCT exists on the Barra Engine.

I know that it's the infinitely variable type, but does work on both Intake and Exhaust Camshafts or just one?

Also, I read a little about how it's all controlled but not how the PCM knows what position the Camshaft is in?

Woz

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  • Moar Powar Babeh
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  • Member For: 18y 6m 5d
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Ba XR both cams advance/retard together

BA Fpv Cams Advance/retard independently

BF XR/FPV as per BA FPV

FG XR/FPV as per BA FPV/BF,but FG FPV's also have duo-phased inlet cams (lobes are offset so one intake valve opens before the other for better offboost performance/fuel econ) I am unsure if this also applies ot FG xr's

All engines have a Cam angle sensor for each cam at the back of the cyl head.

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  • Member For: 13y 2m 9d

I didn't think the independent timing came in until the bf ?? I thought all BA models advanced/retarded cams together.

Yes the duo phased cams in FG are great. Allows more lift and duration for the same engine vacuum and creates swirl in the chamber for a cleaner burn.

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  • Member For: 10y 10m 23d
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Thanks for the responses Guys.

What do the Cam Angle Sensors read? If it's some kind of toothed wheel, does anyone know the wheel pattern?

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  • Member For: 21y 3m 5d
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post-264-0-30384900-1371825292_thumb.jpg

This may help if you look at top right of engine, you can see the cam sensor pickup 'gears'

This is the first engine built for me by Xtreme in about 2005

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