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TasTyger
 Post subject: A+ rocker gear
PostPosted: Thu Mar 06, 2008 10:11 pm 
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Location: Hobart, Tassie
Just a technical point I want to sort out. Can you use the rocker gear from an A series head in conjunction with an A+ cylinder head ? meaning are they interchangeable or do you specifically have to use A+ with A+?

Cheers,

TasTyger :?
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Mick
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PostPosted: Thu Mar 06, 2008 10:12 pm 
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SooperDooperMiniCooper ExpertEngineering
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Location: Under the bonnet son!
Yes, they'll come over fine.

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All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.
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drmini in aust
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PostPosted: Fri Mar 07, 2008 9:46 am 
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Location: near Baulkham Hills, NSW
Yes you can- forged, pressed steel, and sintered A+ are all interchangeable, on either an A or A+ head.

Lift ratios I measured recently (with RE13 cam):
Forged Cooper S 1.16:1
Sintered A+ 1.18:1
Pressed steel (850/998/1098) 1.21:1.

All these were measured on the same rocker posts and with a new HD rocker shaft.

Note if fitting smallbore rockers to a 1275 you usually have to put a flat washer next to the exhaust rockers, to align them better to the (offset) valves.

<edit> typo

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


Last edited by drmini in aust on Tue Mar 11, 2008 8:57 am, edited 1 time in total.

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mason
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PostPosted: Tue Mar 11, 2008 8:31 am 
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yep go for the pressed steel babys give better lift than A+ and are stronger :wink:
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drmini in aust
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PostPosted: Wed Mar 12, 2008 3:41 pm 
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mason wrote:
yep go for the pressed steel babys give better lift than A+ and are stronger :wink:

After I've offset bushed them .044" they are 1.31:1 ratio. 8)
<edit> here's a pic-
Image

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


Last edited by drmini in aust on Thu Mar 27, 2008 9:12 pm, edited 1 time in total.

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wyan
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PostPosted: Tue Mar 25, 2008 6:56 pm 
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Yep,
I put my 1.5:1 minisport ones from my 998 A series to my A+ 1275. :-)
My 2 cents
Cheers
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