Turbocharged, Supercharged, and Hotrod Motorcycles: [turbobike] Supercharger Questions

[turbobike] Supercharger Questions

Joe Allan

beak@seaside.net

Sun, 24 Jan 1999 19:21:42 -0800

This is a multi-part message in MIME format. ------=_NextPart_000_0004_01BE47CE.C5E66B80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 :-) ------=_NextPart_000_0004_01BE47CE.C5E66B80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">

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 :-)