Re: 10.4 pistons

[Richard Welty <rwelty@xxxxxxxxxxxxxxx>]

On Thu, 5 Jun 2003 09:31:10 -0400  "Watry, Andrew (LNG-SFR)" <Andrew.Watry@domain.elided> wrote:

> If the 10.4:1 pistons are the "Motronic" late Bosch pistons, a guy here
> in
> Berkeley has been running a SPICA Berlina engine with those fitted for
> years
> without a problem on regular pump gas.

probably not the 10.4:1 pistons; the current IAP catalog shows the Motronic
pistons as 10:1

i'm quite interested in the tradeoffs of 10.4:1 and 10:1 pistons. i'm
preparing a request to the SCCA competition board for a limited preparation
F Production listing for the Alfetta GT and Alfetta Sedan, and there will
almost certainly be a cap on compression for the limited prep motor. the
question is should i just settle for 10:1 or try for 10.5:1 as the cap? the
bmws that are most similar in terms of size and era (2002/320/318) are
limited to 10:1 in limited prep FP.

another relevant question is what the cap on cam lift should be. all the
cams in the IAP catalog are 11mm tops. this fits under the 0.450" (11.43mm)
cap that, say, the BMW 2002/320/318 are subject to. are there any higher
lift cams of interest? (note that cam timing will be free.)

for fuel supply, i was planning to request OE FI (wes ingram race pumps
would be legal.) there is the possibility of dual sidedraft webers being
legal as well.

richard
--
Richard Welty                                         rwelty@domain.elided
Averill Park Networking                                         518-573-7592
              Unix, Linux, IP Network Engineering, Security
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