Hello AlfaRomeo man
Change head will not give much noticeable difference, if any.
Instead: Take away the sharp edges in the inlet (just behind the valve) Same with the exhaust. You can easily feel the edges with your finger. Reshape the combustion chambers around the inlet valve to reduce shrouding. This is a bit tricky so have a specialist to do it if you are unfamiliar with this job. Then use your valves if you are working on a 1725 head. The Sunbeam/Hillman alloy heads are sensitive to this modifications and it is easy to feel the extra hp above 4000 rpm.
Let the flywheel be! Why is everyone so keen lightening the flywheel. It will not give any extra hp and no faster acceleration. On a full race engine, yes. Fast gearchanges to a lower gear with quick dab on accelerator.
About camshafts ?? Doesn't look that radical on paper (or am I mistaken)
Kristian Jonsson
-----Ursprungligt meddelande-----
Från: Steven Silverstein <milano164(at)mediaone.net>
Till: alpines(at)autox.team.net <alpines(at)autox.team.net>
Datum: den 14 april 2000 08:47
Ämne: 1725 head on a 1600 motor, do the larger valves help?
>I have a couple of questions regarding performance of the 1600cc motor.
>
>1) Is it worth putting a 1725cc head on the 1600cc motor in order to get the
>slightly larger valves? I already have a set of lightened and tuliped
>valves for the 1725cc head
>
>2) If you were building a slightly hot motor but still needed it to be used
>on the street on occasion, how light would you go with the flywheel?
>
>3) Can somebody suggest a performance cam grind that could be used on the
>street. I have two cams, one Hollywood cam and a Weber cam (webco???)
>intake opens at 33BTDC, closes 87ABDC, exhaust opens 78BBDC, closes at
>42ATDC - lift is .320", which both are suppose to be full race. I am
>guessing niether would be suitible for "casual" use.
>
>
>
>
>
>Thanks,
>
>
>Steve Silverstein
>
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