adj timing gears...?

how do they work & are they a "must" for performance ... or just another goodie..?

richard / 93 940t

Reply to
~^ beancounter ~^
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Hard to figure out exacly what you are asking. So I'll take a guess and hope that "adj timing gears" means variable valve timing.

This will certainly enhance performance and efficiency, because static valve timing is necessarily a compromise of conditions. The valves control the flow of gas into and out of the combustion chambers, and at different rates of induction and exhaustion (ie at different engine speeds and loading) optimum flow will occur at differing valve timings. The (early) variable systems I've seen work by altering the relationship of the camshaft to its drive gear.

If your question also implies aftermarket fitment, then I think you'd have your work cut out.

Reply to
Stewart Hargrav

They let you advance or retard the camshaft timing, more or less shifting the compromise between low end torque and high end power. They're most useful when using an aftermarket or otherwise non-stock camshaft.

Reply to
James Sweet

Do you mean the adjustable camshaft wheel (as sold by IPD and others) which allows small adjustments to the timing of the valve gear? If so they have a means of adjustment that enables the timing of the camshaft relative to the crankcase to eliminate the errors due to production. The cam wheel is replaced by this device and the engine is then set so that there are no errors in the timing. This should enable the engine to run at peak efficiency as far as valve timing goes. It does not do the same job as the Honda and Alfa Romeo variable valve timing gear which works on two camshafts and continuously while engine is operating. If you wish to tune your car then they are advantageous in obtaining the best from your car's mechanical set-up.

Cheers, Peter.

Reply to
Peter Milnes

thanx everyone for the info...i learned i can not use one (from IPD - adjustable timing gear)...due to my b230 being between dates that won't allow it...i learned the adj gear is a convenience item that allows you to make slight changes in the effect the cam has on the powerplant...it allows you to pick and choose where you want your power and tourque...ie: on the high end, or on the low end...i am going to forego it, as i installed the IPD performance cam and will accept the "stock" settings...for solid all around performance...

Reply to
~^ beancounter ~^

Is that because of the camshaft driven distributor on the back of the head? If so you could probably still use it, except you may have to adjust the distributor to compensate for it. I think you'll be happy with the performance at the stock setting though.

Reply to
James Sweet

James...yea, stock setting is going to do me just fine...the 940t is running smoooooth and strong right now...w/the stock vx cam setting...i can ruun @ 14-16psi, 0 - 60 in aprox 8 dec...and i am working on gettin the rear tyres to "break loose" and do me some blue smoke....one project after another...thanx for the info...

Reply to
~^ beancounter ~^

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