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| CFM/ HP/Injector sizing/turbo calculations https://slantsix.org/forum/viewtopic.php?t=62444 |
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| Author: | hank [ Wed Jun 06, 2018 4:01 am ] |
| Post subject: | CFM/ HP/Injector sizing/turbo calculations |
Math to me in general is a challenge. So algebra is like... phssss.. but ive calculated a 225 at 6000 Rpm @ 85% VE can pump 330 CFM which has the potential to create 500 PH... this is unrealistic.. l think?? What rpm is a well balanced slant capable of? And im wondering what rpm do some of you turn down the track? I know there are allot of variables, rod length, piston rod weight, ect. Also what HP can a person expect from a well designed slant? @ 85% VE is assumed naturaly aspirated, so with a turbis VE can get up to 100% thats around 550 HP. ( at flywheel that is).. now a stock 225 is rated at 145 HP. So l see some unrealistic numbers here..?.. |
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| Author: | Dart270 [ Wed Jun 06, 2018 6:29 am ] |
| Post subject: | Re: CFM/ HP/Injector sizing/turbo calculations |
You are about right on those numbers. However, lots of things need to line up to make that power - induction, head flow, air charge cooling..... 320-350 crank HP is not hard to make on 8-10 psi Several folks have made over 500 HP over the years. I am just below 400 HP now on 14 psi in a fully street driven car. Lou |
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| Author: | hank [ Fri Jun 08, 2018 6:01 am ] |
| Post subject: | Re: CFM/ HP/Injector sizing/turbo calculations |
Wow Lou.. thats awesome.. ld like to dyno my setup, but the gie wants 175 to hook up to the dyno, and 100 an hr after that Lol.. l dont know about any one else, but my money tree didnt bloom this year... l imagen you use a air to air after cooler. How big is it? Im running into a lot of 4cyl. coolers. I think im looking for one that is about 26in (squared) ?? Should be rated for 400HP. Pipeing to cooler 2 in, and from cooler 2.25in or 2.5in... l feel im on the right path here. Lou do you run a carb setup or EFI? |
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| Author: | Dart270 [ Fri Jun 08, 2018 7:05 am ] |
| Post subject: | Re: CFM/ HP/Injector sizing/turbo calculations |
Port EFI (Megasquirt I with other stuff homebuilt), water/methanol injection, no intercoolers. Have never dyno'ed, but it has gone 12.70s @ 108 MPH on 14 psi at 3300 lb racewt. Hi 13s on 6-7 psi and mid 13s on 9 psi. Lou |
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| Author: | Joshie225 [ Fri Jun 08, 2018 7:18 am ] |
| Post subject: | Re: CFM/ HP/Injector sizing/turbo calculations |
The Ray Hall Turbocharging web site has some useful calculators. http://www.turbofast.com.au/ Your big calculation error was in the VE. If you play with a Dyno 2000 or other simulation you'll find the VE numbers are much lower. Also, the 145 hp rating is a myth. There was a discussion on the matter a few months ago. A stock 225 with good exhaust makes about 120 hp and this is reflected in the net hp rating found on Dodge trucks. |
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