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Author Autosprint 272 cams
ainsley_brader
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Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
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25th Jun 08 at 19:18   View User's Profile U2U Member Reply With Quote
Are these cams from blanks or reprofiled?

I have an engine that is supposed to have 272 cams in it looking at them they appear to have std vauxhall casting marks on them.

So i'm assuming they are reprofiled or they aren't 272s lol.

How do i measure them to check?

Thanks
Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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25th Jun 08 at 20:20   View User's Profile U2U Member Reply With Quote
Autosprint do 272 re-grinds yes.
They do blanks too
ainsley_brader
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Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
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25th Jun 08 at 20:28   View User's Profile U2U Member Reply With Quote
so doi they mark them? Anyone know?

Or how do i measure them?
RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
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25th Jun 08 at 22:50   View User's Profile U2U Member Reply With Quote
You can measure the profile using a dial gauge indicator.

I mount the cam in a bare cylinder head, make a 360 degree wheel and attach it behind the pulley. Rotate the cam and record the amount of lift for however many degree increments you choose.
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
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26th Jun 08 at 14:55   View User's Profile U2U Member Reply With Quote
or measure the height and width of the cam lobe, subtract the width from the height = amount of lift on the cam.
ainsley_brader
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Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
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26th Jun 08 at 18:25   View User's Profile U2U Member Reply With Quote
what does the 272 refer too? duration i assume rather than lift

can't be open for 272 degrees though can they? So i assume thats from when the valve starts to lift its seat to when it closes?

What are std c20xe cams?

[Edited on 26-06-2008 by ainsley_brader]
Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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26th Jun 08 at 19:03   View User's Profile U2U Member Reply With Quote
Yes, 272 deg duration. How many crankshaft rotation degrees he valve is off its seat for
ainsley_brader
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Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
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26th Jun 08 at 19:04   View User's Profile U2U Member Reply With Quote
crank not cam?
Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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26th Jun 08 at 20:12   View User's Profile U2U Member Reply With Quote
Yes crank.
Do forget the crank does 2 revolutions for 1 of the cam.

[Edited on 26-06-2008 by Vaux Lad]
RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
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26th Jun 08 at 20:46   View User's Profile U2U Member Reply With Quote
It'll be off its seat more than 272 degrees. Standard cams are open 270 degrees in total. The 272 duration figure is quoted at a certain lift value.
ainsley_brader
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Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
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26th Jun 08 at 20:51   View User's Profile U2U Member Reply With Quote
so what is std lift then
RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
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26th Jun 08 at 21:04   View User's Profile U2U Member Reply With Quote
8.45mm for Inlet and Exhaust.
Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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27th Jun 08 at 16:05   View User's Profile U2U Member Reply With Quote
And standard duration is around 244deg

 
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