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[turbobike] Supercharger Questions

Joe Allan (beak@seaside.net)
Sun, 24 Jan 1999 19:21:42 -0800

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Hello All;=20
     Been lurking for a while now, I  just acquired a supercharger kit =
(circa mid 70s) for a SOHC750 Honda motor, so it was great to find a =
list that is specific to this sort of stuff. I race a SOHC 750 in the =
vintage class at our local dirt drags and am going to build a SOHC motor =
that is suitable for the blower. I have some basic questions that I need =
some help with:
 *the blower came as a kit to be bolted on a stock 736cc motor, it says =
that it provides 10psi boost at max RPM (8200),  if I increase the =
displacement how much should I increase the speed of the blower to =
compensate, is the formula a straight 10% increase in displacement =
=3D10% increase in blower speed needed etc to stay at 10psi??
*what would the effect of lowering the compression have on blower =
function, is this benificial to performance because of combustion =
control (detonation etc) or done just to be able to "stuff" more mixture =
in.=20
*I plan to run the motor on alcohol, will this take away a lot of the =
problems of detonation, timing etc.
 My present plan is to run the blower kit "as is" on a motor with a =
812cc bore kit, the 812cc pistons are 10.5-1, should I lower the =
compression or ?? and will the stock cam be ok or should I get a blower =
grind cam ground.=20
Our race track is 100yds long and the motor will run one gear only, =
races are about 5 secs in duration.=20
  Sorry for all the questions but I think it's easier to ask people who =
have been there, before I start learning from scratch.
 Thanks in advance
Joe=20
PS- got a 1972 SOHC Honda 750 with a American TurboPak turbo kit on it =
also, but it was together already when I bought it, so I didn't have too =
build the motor :-)

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Hello All;
     Been = lurking for a=20 while now, I  just acquired a supercharger kit (circa mid 70s) for = a=20 SOHC750 Honda motor, so it was great to find a list that is specific to = this=20 sort of stuff. I race a SOHC 750 in the vintage class at our local dirt = drags=20 and am going to build a SOHC motor that is suitable for the blower. I = have some=20 basic questions that I need some help with:
 *the blower came as a kit to = be bolted on=20 a stock 736cc motor, it says that it provides 10psi boost at max RPM=20 (8200),  if I increase the displacement how much should I increase = the=20 speed of the blower to compensate, is the formula a straight 10% = increase in=20 displacement =3D10% increase in blower speed needed etc to stay at=20 10psi??
*what would the effect of lowering = the=20 compression have on blower function, is this benificial to performance = because=20 of combustion control (detonation etc) or done just to be able to=20 "stuff" more mixture in.
*I plan to run the motor on alcohol, = will this=20 take away a lot of the problems of detonation, timing etc.
 My present plan is to run the = blower kit=20 "as is" on a motor with a 812cc bore kit, the 812cc pistons = are=20 10.5-1, should I lower the compression or ?? and will the stock cam be = ok or=20 should I get a blower grind cam ground.
Our race track is 100yds long and = the motor will=20 run one gear only, races are about 5 secs in duration.
  Sorry for all the questions = but I think=20 it's easier to ask people who have been there, before I start learning = from=20 scratch.
 Thanks in advance
Joe
PS- got a 1972 SOHC Honda 750 with a = American=20 TurboPak turbo kit on it also, but it was together already when I bought = it, so=20 I didn't have too build the motor :-)
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