Dear Spridget listers:
This item has been on the MG list this morning, but perhaps it would be
better to forward it here.
The crux of the topic was my question about how to alter a 1968 A-series
engine (originally with smog equipment) in order to turn it into a 1967
engine, which the R&T figures show had 20% more horsepower. Besides the
plugging up of the air injection ports and the PCV valve, what (if anything)
is specifically different about the block?
Was the actual block from the same casting in during that period?
Regards,
Charles
'74 Midget
'68 Sprite
cdsorkin@ix.netcom.com
Bloomfield, NJ
"How about we duck inside for a Hen?"
-----Original Message-----
From Trevor Boicey <tboicey at brit.ca>
To: Max Heim <mvheim@studiolimage.com>
Cc: Charles D. Sorkin <cdsorkin@ix.netcom.com>; MG List <mgs@autox.team.net>
Date: Tuesday, April 18, 2000 1:48 PM
Subject: Re: 79 B HP Rating
>Max Heim wrote:
>> I am not
>> sure what the functional distinctions are between the HS-4 and HIF SUs,
>> other than the butterflies, but presumably they contribute something.
>
> On a flow bench, the HIF SUs flow a little more air.
>
>> BTW, here are the R&T figures on the Spridget:
>> 1958 Sprite (948) - 48HP @ 5000
>> 1961 Sprite (948) - 50 @ 5500
>> 1963 Sprite (1098) - 55 @ 5500
>> 1967 Midget (1275) - 65 @ 6000
>> 1973 Midget (1275) - 55 @ 5500
>> 1976 Midget (1500) - 55.5 @ 5000 (where'd they get the 1/2 HP?)
>> 1979 Midget (1500) - 50 @ 5000
>
> It is between 67 and 73 that the infamous "measurement
>changes" would have occured, so comparing before and after
>figures are not too meaningful.
>
> You will notice that the Midget 1500 was faster in
>press tests than the A-series midgets, both in 0-60
>and top speed, although in the HP graphs this seems
>unlikely.
>
>--
>Trevor Boicey, P. Eng.
>Ottawa, Canada, tboicey@brit.ca
>ICQ #17432933 http://www.brit.ca/~tboicey/
>"It seems like they have names for everything nowadays!" - Ajax
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