[VintageLambo] Re: The 1st V 12 Jalpa ...ala Filippo Cusimano (with Chad's blessings-)

Hi Fred, Those "rice-rockets" are quite impressive and the HP claims match their ¼ mile times, so I think it is close enough to believe. Interestingly enough at max rpm the inertia forces in a normally aspirated IC engine are quite a bit higher than the combustion forces. Additionally the combustion force is opposite the inertia force, actually helping to reduce the internal stresses on the piston and connecting rod. This essentially means that an engine without bottom end modifications typically can handle higher compression pressure (more boost) especially if it is not at low rpm. Take a look at this torque curve from an Audi RS-6 (twin turbo 4.2L V8). Due to the characteristics of a turbocharger there probably is 900HP in that engine, but is electronically (with waste- gates) tailored to have a impressively flat torque between 1950 and 6500rpm. http://www.audiworld.com/news/02/rs6detail/rs6d005.jpg My guess is that the high HP "rice-rockets" are very difficult to drive with slow spool-up and peaky torque. I on occasion take my 944T to the track and find it challenging enough to remember (and have the guts) to step on the accelerator in the middle of a turn expecting nothing to happen until 2-3 seconds later when exiting the turn. Best regards, Laust --- In VintageLambo@yahoogroups.com, "lamboguy " wrote: > Hi Laust, > > Great to have you here!Jack told me about the modifications you are > doing on your Jalpa, but seeing it in writing -- wow, very > impressive!I bet you get even more hp than you think.But I guess > there"s only one way to find out... > > I"m curious, what do you think of the hp numbers these Supra guys are > getting with their turbo setups: > > http://www.playerviolin.com/carstuff/SupraDyno.htm > > 850hp (wheel) out of a 2.9 liter street motor, with a stock lower > end.Do you think that"s true? > > Anyway, it was great to meet you in Monterey this past August. > > Best regards, > > Fred