jkdmag
Automotive
- Sep 9, 2009
- 40
Have questions regarding supercharger calculations including intercooler type selection.
First part, my calculations indicate that an SC14 supercharger is capable of supplying at least 10 psi boost to a 3.8 litre engine, notwithstanding many comments to the contrary on the internet. The prevailing view seems to be that because this model of supercharger came from a 2 litre engine it is incapable of boosting such a large engine.
Given that the SC14 swept volume is 1420 cc & assuming it has a max rpm approaching 10,000 rpm, I do not see why it cannot provide enough air flow & density, with an intercooler, for 3.8 litre engine.
Understand that the rotors are teflon coated & do not like continual high speed/high load and therefore intend to use it with a clutched pulley, thereby only engaging the supercharger when required.
Given that my air flow numbers are correct & the supercharger is subject to only intermittent use, is there some engineering issue I have missed that makes the idea unworkable.
Second part, installation difficulties of front mounted air/air intercooler, including engine bay space limitations for the plumbing, make air/water intercooler attractive. Easier to route water hoses through engine bay & small size air/water intercooler can be accommodated within the engine bay.
However, concerned that air/water intercooler can only reduce supercharger outlet temperature to approx. 35 deg F above ambient, two stages of imperfect heat transfer as opposed to air/air intercooler's one. I can see that the air/water intercooler's 35 deg above ambient issue could be acceptable if the supercharger outlet temperature was significantly higher than ambient, e.g. 250/300 deg, but not for temperatures less than 200 deg.
Again is this a sound assessment of the air/air vs air/water intercooler quandary.
First part, my calculations indicate that an SC14 supercharger is capable of supplying at least 10 psi boost to a 3.8 litre engine, notwithstanding many comments to the contrary on the internet. The prevailing view seems to be that because this model of supercharger came from a 2 litre engine it is incapable of boosting such a large engine.
Given that the SC14 swept volume is 1420 cc & assuming it has a max rpm approaching 10,000 rpm, I do not see why it cannot provide enough air flow & density, with an intercooler, for 3.8 litre engine.
Understand that the rotors are teflon coated & do not like continual high speed/high load and therefore intend to use it with a clutched pulley, thereby only engaging the supercharger when required.
Given that my air flow numbers are correct & the supercharger is subject to only intermittent use, is there some engineering issue I have missed that makes the idea unworkable.
Second part, installation difficulties of front mounted air/air intercooler, including engine bay space limitations for the plumbing, make air/water intercooler attractive. Easier to route water hoses through engine bay & small size air/water intercooler can be accommodated within the engine bay.
However, concerned that air/water intercooler can only reduce supercharger outlet temperature to approx. 35 deg F above ambient, two stages of imperfect heat transfer as opposed to air/air intercooler's one. I can see that the air/water intercooler's 35 deg above ambient issue could be acceptable if the supercharger outlet temperature was significantly higher than ambient, e.g. 250/300 deg, but not for temperatures less than 200 deg.
Again is this a sound assessment of the air/air vs air/water intercooler quandary.